X0609 4 2026-10-13 0002071778 Fermi Inc. FRMI 0001098464 NEUGEBAUER TOBY R false 10777 STRAIT LANE DALLAS TX 75229 false false true false 0002088794 Melissa A. Neugebauer 2020 Trust false 10777 STRAIT LANE DALLAS TX 75229 false false true false false Common Stock 2026-10-13 4 S false 2750000 3.7333 D 91609659 I See Footnote Common Stock 2026-10-14 4 S false 1297200 3.1524 D 43359176 I See Footnote Common Stock 7500000 D The price reported in Column 4 above reflects the weighted average sale price. This transaction was executed in multiple trades at prices ranging from $3.69 to $3.845, inclusive. The Reporting Persons (as defined herein) hereby undertake to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote 1 of this Form 4. These securities are directly held by Melissa A. Neugebauer 2020 Trust (the "Trust"). Toby R. Neugebauer ("Mr. Neugebauer" and, together with the Trust, the "Reporting Persons") is the investment trustee of the Trust and may be deemed to beneficially own the securities held by the Trust. Mr. Neugebauer disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein. This report shall not be deemed an admission that Mr. Neugebauer is the beneficial owner of such securities for purposes of Sections 13 and 16 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or for any other purpose. The Reporting Persons declare that neither the filing of this statement nor anything herein shall be construed as an admission that such persons are, for the purposes of Section 13(d) or 13(g) of the Exchange Act or any other purpose, a member of a group with respect to the Issuer or securities of the Issuer. The price reported in Column 4 above reflects the weighted average sale price. This transaction was executed in multiple trades at prices ranging from $3.09 to $3.215, inclusive. Mr. Neugebauer hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote 3 of this Form 4. This figure has been adjusted (i) to correct the figure reported in the Form 3 the Reporting Persons filed on September 30, 2025, which should have reported that Vicksburg Investments Management LLC held 40,156,376 shares, and (ii) to reflect the transfer of 4,500,000 shares from TMNN Manager LLC, of which Mr. Neugebauer is the managing member, to Vicksburg Investments Management LLC, of which Mr. Neugebauer is also the managing member, on December 19, 2025, which transaction was exempt from Section 16 of the Exchange Act pursuant to Rule 16a-13 thereunder. These securities are directly held by Vicksburg Investments Management LLC. Mr. Neugebauer is the managing member of Vicksburg Investments Management LLC and may be deemed to beneficially own the securities held by Vicksburg Investments Management LLC. Mr. Neugebauer disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein. This report shall not be deemed an admission that Mr. Neugebauer is the beneficial owner of such securities for purposes of Sections 13 and 16 of the Exchange Act or for any other purpose. /s/ Toby R. Neugebauer 2026-10-15 Melissa A. Neugebauer 2020 Trust, By: /s/ Toby R. Neugebauer, Trustee 2026-10-15