0000917469 2025-02-01 2025-02-01 0000917469 lsfi:S000006639Member 2025-02-01 2025-02-01 0000917469 lsfi:S000006640Member 2025-02-01 2025-02-01 0000917469 lsfi:S000006641Member 2025-02-01 2025-02-01 0000917469 lsfi:S000006642Member 2025-02-01 2025-02-01 0000917469 lsfi:S000006643Member 2025-02-01 2025-02-01 0000917469 lsfi:S000006644Member 2025-02-01 2025-02-01 0000917469 lsfi:S000006645Member 2025-02-01 2025-02-01 0000917469 lsfi:S000006647Member 2025-02-01 2025-02-01 iso4217:USD pure false 2025-05-01 2024-09-30 497 0000917469 LOOMIS SAYLES FUNDS I N-1A <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Supplement dated May 1, 2025 to the Loomis Sayles Funds Prospectus and Statement of </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Additional Information (“SAI”), each dated February 1, 2025, as may be revised or </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">supplemented from time to time, for the following funds: </span></div> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;width:100%;border-spacing:0px;margin:0 auto"> <tr> <td style="width:51%;"></td> <td style="vertical-align:bottom;width:1%;"></td> <td style="width:48%;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Fixed Income Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small Cap Growth Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Global Bond Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small Cap Value Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Inflation Protected Securities Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small/Mid Cap Growth Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:top;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Institutional High Income Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"></td> </tr> </table><div style="margin-top:18pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;"><span style="font-style:italic">Effective immediately, the following disclosure under the sub‑section “more information about investment strategies” in the section “Portfolio Holdings” within the Fund’s Prospectus is hereby amended and restated as follows: </span></div><div style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A description of the Funds’ policies and procedures with respect to the disclosure of each Fund’s portfolio securities is available in the Funds’ SAI. </div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A “snapshot” of each Fund’s investments may be found in each Fund’s filing on Form N‑CSR. In addition, a list of the Fund’s full portfolio holdings, which is updated monthly after an aging period of at least 30 calendar days, (60 calendar days for Loomis Sayles Small Cap Value Fund) is available on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail” then “Holdings”, then “View Holdings”). These holdings will remain accessible on the website at least until the Fund files its Form N‑CSR or Form N‑PORT with the SEC for the period that includes the date of the information. In addition, a list of the Fund’s top 10 holdings as of the month‑end is generally available within 7 business days after the month‑end on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail”, then “Holdings”, then “View Holdings” (click fund name)). </div> <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Supplement dated May 1, 2025 to the Loomis Sayles Funds Prospectus and Statement of </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Additional Information (“SAI”), each dated February 1, 2025, as may be revised or </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">supplemented from time to time, for the following funds: </span></div> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;width:100%;border-spacing:0px;margin:0 auto"> <tr> <td style="width:51%;"></td> <td style="vertical-align:bottom;width:1%;"></td> <td style="width:48%;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Fixed Income Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small Cap Growth Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Global Bond Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small Cap Value Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Inflation Protected Securities Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small/Mid Cap Growth Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:top;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Institutional High Income Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"></td> </tr> </table><div style="margin-top:18pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;"><span style="font-style:italic">Effective immediately, the following disclosure under the sub‑section “more information about investment strategies” in the section “Portfolio Holdings” within the Fund’s Prospectus is hereby amended and restated as follows: </span></div><div style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A description of the Funds’ policies and procedures with respect to the disclosure of each Fund’s portfolio securities is available in the Funds’ SAI. </div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A “snapshot” of each Fund’s investments may be found in each Fund’s filing on Form N‑CSR. In addition, a list of the Fund’s full portfolio holdings, which is updated monthly after an aging period of at least 30 calendar days, (60 calendar days for Loomis Sayles Small Cap Value Fund) is available on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail” then “Holdings”, then “View Holdings”). These holdings will remain accessible on the website at least until the Fund files its Form N‑CSR or Form N‑PORT with the SEC for the period that includes the date of the information. In addition, a list of the Fund’s top 10 holdings as of the month‑end is generally available within 7 business days after the month‑end on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail”, then “Holdings”, then “View Holdings” (click fund name)). </div> <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Supplement dated May 1, 2025 to the Loomis Sayles Funds Prospectus and Statement of </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Additional Information (“SAI”), each dated February 1, 2025, as may be revised or </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">supplemented from time to time, for the following funds: </span></div> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;width:100%;border-spacing:0px;margin:0 auto"> <tr> <td style="width:51%;"></td> <td style="vertical-align:bottom;width:1%;"></td> <td style="width:48%;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Fixed Income Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small Cap Growth Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Global Bond Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small Cap Value Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Inflation Protected Securities Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small/Mid Cap Growth Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:top;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Institutional High Income Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"></td> </tr> </table><div style="margin-top:18pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;"><span style="font-style:italic">Effective immediately, the following disclosure under the sub‑section “more information about investment strategies” in the section “Portfolio Holdings” within the Fund’s Prospectus is hereby amended and restated as follows: </span></div><div style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A description of the Funds’ policies and procedures with respect to the disclosure of each Fund’s portfolio securities is available in the Funds’ SAI. </div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A “snapshot” of each Fund’s investments may be found in each Fund’s filing on Form N‑CSR. In addition, a list of the Fund’s full portfolio holdings, which is updated monthly after an aging period of at least 30 calendar days, (60 calendar days for Loomis Sayles Small Cap Value Fund) is available on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail” then “Holdings”, then “View Holdings”). These holdings will remain accessible on the website at least until the Fund files its Form N‑CSR or Form N‑PORT with the SEC for the period that includes the date of the information. In addition, a list of the Fund’s top 10 holdings as of the month‑end is generally available within 7 business days after the month‑end on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail”, then “Holdings”, then “View Holdings” (click fund name)). </div> <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Supplement dated May 1, 2025 to the Loomis Sayles Funds Prospectus and Statement of </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Additional Information (“SAI”), each dated February 1, 2025, as may be revised or </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">supplemented from time to time, for the following funds: </span></div> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;width:100%;border-spacing:0px;margin:0 auto"> <tr> <td style="width:51%;"></td> <td style="vertical-align:bottom;width:1%;"></td> <td style="width:48%;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Fixed Income Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small Cap Growth Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Global Bond Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small Cap Value Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Inflation Protected Securities Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small/Mid Cap Growth Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:top;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Institutional High Income Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"></td> </tr> </table><div style="margin-top:18pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;"><span style="font-style:italic">Effective immediately, the following disclosure under the sub‑section “more information about investment strategies” in the section “Portfolio Holdings” within the Fund’s Prospectus is hereby amended and restated as follows: </span></div><div style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A description of the Funds’ policies and procedures with respect to the disclosure of each Fund’s portfolio securities is available in the Funds’ SAI. </div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A “snapshot” of each Fund’s investments may be found in each Fund’s filing on Form N‑CSR. In addition, a list of the Fund’s full portfolio holdings, which is updated monthly after an aging period of at least 30 calendar days, (60 calendar days for Loomis Sayles Small Cap Value Fund) is available on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail” then “Holdings”, then “View Holdings”). These holdings will remain accessible on the website at least until the Fund files its Form N‑CSR or Form N‑PORT with the SEC for the period that includes the date of the information. In addition, a list of the Fund’s top 10 holdings as of the month‑end is generally available within 7 business days after the month‑end on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail”, then “Holdings”, then “View Holdings” (click fund name)). </div> <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Supplement dated May 1, 2025 to the Loomis Sayles Funds Prospectus and Statement of </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Additional Information (“SAI”), each dated February 1, 2025, as may be revised or </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">supplemented from time to time, for the following funds: </span></div> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;width:100%;border-spacing:0px;margin:0 auto"> <tr> <td style="width:51%;"></td> <td style="vertical-align:bottom;width:1%;"></td> <td style="width:48%;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Fixed Income Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small Cap Growth Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Global Bond Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small Cap Value Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Inflation Protected Securities Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small/Mid Cap Growth Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:top;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Institutional High Income Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"></td> </tr> </table><div style="margin-top:18pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;"><span style="font-style:italic">Effective immediately, the following disclosure under the sub‑section “more information about investment strategies” in the section “Portfolio Holdings” within the Fund’s Prospectus is hereby amended and restated as follows: </span></div><div style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A description of the Funds’ policies and procedures with respect to the disclosure of each Fund’s portfolio securities is available in the Funds’ SAI. </div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A “snapshot” of each Fund’s investments may be found in each Fund’s filing on Form N‑CSR. In addition, a list of the Fund’s full portfolio holdings, which is updated monthly after an aging period of at least 30 calendar days, (60 calendar days for Loomis Sayles Small Cap Value Fund) is available on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail” then “Holdings”, then “View Holdings”). These holdings will remain accessible on the website at least until the Fund files its Form N‑CSR or Form N‑PORT with the SEC for the period that includes the date of the information. In addition, a list of the Fund’s top 10 holdings as of the month‑end is generally available within 7 business days after the month‑end on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail”, then “Holdings”, then “View Holdings” (click fund name)). </div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Supplement dated May 1, 2025 to the Loomis Sayles Funds Prospectus and Statement of </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Additional Information (“SAI”), each dated February 1, 2025, as may be revised or </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">supplemented from time to time, for the following funds: </span></div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;text-align:center;">Loomis Sayles High Income Opportunities Fund </div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;text-align:center;">Loomis Sayles Securitized Asset Fund </div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;text-align:center;">(the “Funds”) </div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;"><span style="font-style:italic">Effective immediately, the following disclosure under the sub‑section “more information about investment strategies” in the section “Portfolio Holdings” within the Fund’s Prospectus is hereby amended and restated as follows: </span></div><div style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A description of the Funds’ policies and procedures with respect to the disclosure of each Fund’s portfolio securities is available in the Funds’ SAI. </div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A “snapshot” of each Fund’s investments may be found in each Fund’s filing on Form N‑CSR. In addition, a list of the Fund’s full portfolio holdings, which is updated monthly after an aging period of at least 30 calendar days, is available on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail” then “Holdings”, then “Fixed Income”, then “Complete Holdings”. These holdings will remain accessible on the website at least until the Fund files its Form N‑CSR or Form N‑PORT with the SEC for the period that includes the date of the information. In addition, a list of the Fund’s top 10 holdings as of the month‑end is generally available within 7 business days after the month‑end on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail”, then “Holdings”, then “View Holdings” (click fund name)). </div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Supplement dated May 1, 2025 to the Natixis Funds Prospectus and Statement of Additional </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Information (“SAI”), each dated February 1, 2025, as may be revised or supplemented from </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">time to time, for the following funds: </span></div> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;width:100%;border-spacing:0px;margin:0 auto"> <tr> <td style="width:51%;"></td> <td style="vertical-align:bottom;width:1%;"></td> <td style="width:48%;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:top;"><span style="font-weight:bold">Loomis Sayles Core Plus Bond Fund</span></td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:top;"><span style="font-weight:bold">Loomis Sayles Intermediate Duration Bond Fund</span></td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:top;"><span style="font-weight:bold">Loomis Sayles Global Allocation Fund</span></td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:top;"><span style="font-weight:bold">Loomis Sayles Limited Term Government and Agency Fund</span></td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:top;"><span style="font-weight:bold">Loomis Sayles Growth Fund</span></td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:top;"></td> </tr> </table><div style="margin-top:18pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;"><span style="font-style:italic">Effective immediately, the following disclosure within “Portfolio Holdings” of “More About Goals and Strategies” sub‑section within the “Investment Goals, Strategies and Risks” section within the Fund’s Prospectus is hereby amended and restated as follows: </span></div><div style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A description of each Funds’ policies and procedures with respect to the disclosure of each Fund’s portfolio securities is available in the section “Portfolio Holdings Information” in the SAI. </div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A “snapshot” of each Fund’s investments may be found in its filing on Form N‑CSR. In addition, a list of each Fund’s full portfolio holdings, which is updated monthly after an aging period of at least 30 calendar days, is available on the Funds’ website at www.im.natixis.com/us/fund-documents (in the “Holdings” column, select “Full portfolio holdings” for the relevant Fund). These holdings will remain accessible on the website at least until each Fund files its respective Form N‑CSR or Form N‑PORT with the SEC for the period that includes the date of the information. In addition, a list of each Fund’s top 10 holdings as of the month‑end is generally available within 7 business days after the month‑end on the Funds’ website at www.im.natixis.com/us/fund-documents (click Fund name and navigate to “Top Ten Holdings” section on the web page). </div> <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Supplement dated May 1, 2025 to the Loomis Sayles Funds Prospectus and Statement of </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Additional Information (“SAI”), each dated February 1, 2025, as may be revised or </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">supplemented from time to time, for the following funds: </span></div> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;width:100%;border-spacing:0px;margin:0 auto"> <tr> <td style="width:51%;"></td> <td style="vertical-align:bottom;width:1%;"></td> <td style="width:48%;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Fixed Income Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small Cap Growth Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Global Bond Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small Cap Value Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Inflation Protected Securities Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Small/Mid Cap Growth Fund</div> </td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:top;"> <div style="margin-top:0pt;margin-bottom:0pt;margin-left:1.00em;text-indent:-1.00em;font-size:10pt;font-family:times new roman;font-weight:bold;">Loomis Sayles Institutional High Income Fund</div> </td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:bottom;"></td> </tr> </table><div style="margin-top:18pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;"><span style="font-style:italic">Effective immediately, the following disclosure under the sub‑section “more information about investment strategies” in the section “Portfolio Holdings” within the Fund’s Prospectus is hereby amended and restated as follows: </span></div><div style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A description of the Funds’ policies and procedures with respect to the disclosure of each Fund’s portfolio securities is available in the Funds’ SAI. </div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A “snapshot” of each Fund’s investments may be found in each Fund’s filing on Form N‑CSR. In addition, a list of the Fund’s full portfolio holdings, which is updated monthly after an aging period of at least 30 calendar days, (60 calendar days for Loomis Sayles Small Cap Value Fund) is available on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail” then “Holdings”, then “View Holdings”). These holdings will remain accessible on the website at least until the Fund files its Form N‑CSR or Form N‑PORT with the SEC for the period that includes the date of the information. In addition, a list of the Fund’s top 10 holdings as of the month‑end is generally available within 7 business days after the month‑end on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail”, then “Holdings”, then “View Holdings” (click fund name)). </div> 2025-05-01 2025-02-01 <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Supplement dated May 1, 2025 to the Loomis Sayles Funds Prospectus and Statement of </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Additional Information (“SAI”), each dated February 1, 2025, as may be revised or </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">supplemented from time to time, for the following funds: </span></div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;text-align:center;">Loomis Sayles High Income Opportunities Fund </div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;text-align:center;">(the “Funds”) </div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;"><span style="font-style:italic">Effective immediately, the following disclosure under the sub‑section “more information about investment strategies” in the section “Portfolio Holdings” within the Fund’s Prospectus is hereby amended and restated as follows: </span></div><div style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A description of the Funds’ policies and procedures with respect to the disclosure of each Fund’s portfolio securities is available in the Funds’ SAI. </div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A “snapshot” of each Fund’s investments may be found in each Fund’s filing on Form N‑CSR. In addition, a list of the Fund’s full portfolio holdings, which is updated monthly after an aging period of at least 30 calendar days, is available on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail” then “Holdings”, then “Fixed Income”, then “Complete Holdings”. These holdings will remain accessible on the website at least until the Fund files its Form N‑CSR or Form N‑PORT with the SEC for the period that includes the date of the information. In addition, a list of the Fund’s top 10 holdings as of the month‑end is generally available within 7 business days after the month‑end on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail”, then “Holdings”, then “View Holdings” (click fund name)). </div> <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Supplement dated May 1, 2025 to the Loomis Sayles Funds Prospectus and Statement of </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Additional Information (“SAI”), each dated February 1, 2025, as may be revised or </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">supplemented from time to time, for the following funds: </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;text-align:center;">Loomis Sayles Securitized Asset Fund </div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;text-align:center;">(the “Funds”) </div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;"><span style="font-style:italic">Effective immediately, the following disclosure under the sub‑section “more information about investment strategies” in the section “Portfolio Holdings” within the Fund’s Prospectus is hereby amended and restated as follows: </span></div><div style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A description of the Funds’ policies and procedures with respect to the disclosure of each Fund’s portfolio securities is available in the Funds’ SAI. </div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A “snapshot” of each Fund’s investments may be found in each Fund’s filing on Form N‑CSR. In addition, a list of the Fund’s full portfolio holdings, which is updated monthly after an aging period of at least 30 calendar days, is available on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail” then “Holdings”, then “Fixed Income”, then “Complete Holdings”. These holdings will remain accessible on the website at least until the Fund files its Form N‑CSR or Form N‑PORT with the SEC for the period that includes the date of the information. In addition, a list of the Fund’s top 10 holdings as of the month‑end is generally available within 7 business days after the month‑end on the Fund’s website at www.loomissayles.com (click on the drop-down menu titled “Retail”, then “Holdings”, then “View Holdings” (click fund name)). </div> <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Supplement dated May 1, 2025 to the Natixis Funds Prospectus and Statement of Additional </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">Information (“SAI”), each dated February 1, 2025, as may be revised or supplemented from </span></div><div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;text-align:center;"><span style="font-style:italic">time to time, for the following funds: </span></div> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;width:100%;border-spacing:0px;margin:0 auto"> <tr> <td style="width:51%;"></td> <td style="vertical-align:bottom;width:1%;"></td> <td style="width:48%;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:top;"><span style="font-weight:bold">Loomis Sayles Core Plus Bond Fund</span></td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:top;"><span style="font-weight:bold">Loomis Sayles Intermediate Duration Bond Fund</span></td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:top;"><span style="font-weight:bold">Loomis Sayles Global Allocation Fund</span></td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:top;"><span style="font-weight:bold">Loomis Sayles Limited Term Government and Agency Fund</span></td> </tr> <tr style="font-size:1pt"> <td style="height:6pt;"></td> <td colspan="2" style="height:6pt;"></td> </tr> <tr style="page-break-inside:avoid;font-family:times new roman;font-size:10pt"> <td style="vertical-align:top;"><span style="font-weight:bold">Loomis Sayles Growth Fund</span></td> <td style="vertical-align:bottom;">  </td> <td style="vertical-align:top;"></td> </tr> </table><div style="margin-top:18pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;font-weight:bold;"><span style="font-style:italic">Effective immediately, the following disclosure within “Portfolio Holdings” of “More About Goals and Strategies” sub‑section within the “Investment Goals, Strategies and Risks” section within the Fund’s Prospectus is hereby amended and restated as follows: </span></div><div style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A description of each Funds’ policies and procedures with respect to the disclosure of each Fund’s portfolio securities is available in the section “Portfolio Holdings Information” in the SAI. </div><div style="margin-top:12pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">A “snapshot” of each Fund’s investments may be found in its filing on Form N‑CSR. In addition, a list of each Fund’s full portfolio holdings, which is updated monthly after an aging period of at least 30 calendar days, is available on the Funds’ website at www.im.natixis.com/us/fund-documents (in the “Holdings” column, select “Full portfolio holdings” for the relevant Fund). These holdings will remain accessible on the website at least until each Fund files its respective Form N‑CSR or Form N‑PORT with the SEC for the period that includes the date of the information. In addition, a list of each Fund’s top 10 holdings as of the month‑end is generally available within 7 business days after the month‑end on the Funds’ website at www.im.natixis.com/us/fund-documents (click Fund name and navigate to “Top Ten Holdings” section on the web page). </div>