LORD ABBETT CREDIT OPPORTUNITIES FUND

Supplement dated January 15, 2020

to the Prospectus dated September 13, 2019, as supplemented

The following section is replacing in its entirety the “Reducing Your Class A Share Front-End Sales Charge” section on page 73 of the prospectus:

Reducing Your Class A Share Front-End Sales Charge. You may purchase Class A Shares at a discount if you qualify under the circumstances outlined below. To receive a reduced front-end sales charge, you must let the Fund or your financial intermediary know at the time of your purchase of Fund Shares that you believe you qualify for a discount. If you or a related party have holdings of Eligible Funds in other accounts with your financial intermediary or with other financial intermediaries that may be combined with your current purchase in determining the sales charge as described below, you must let the Fund or your financial intermediary know. Investors should consult with their financial intermediary about the calculation of the sales charge and any additional fees or charges their financial intermediary might impose on Class A Shares.

You may be asked to provide supporting account statements or other information to allow us or your financial intermediary to verify your eligibility for a discount. If you or your financial intermediary do not notify the Fund or provide the requested information, you may not receive the reduced sales charge for which you otherwise qualify. Class A Shares may be purchased at a discount if you qualify under any of the following conditions:

•  Rights of Accumulation – When purchasing Shares of the Fund, a Purchaser (as defined below) may combine the value of Class A, A1, C, F, and P shares of any Eligible Fund currently owned with a new purchase of Class A Shares of the Fund in order to reduce the sales charge on the new purchase. Class F3, I, R2, R3, R4, R5, and R6 share holdings may not be combined for these purposes.           

To the extent that your financial intermediary is able to do so, the value of Class A, A1, C, F, and P shares of Eligible Funds determined for the purpose of reducing the sales charge of a new purchase under the Rights of Accumulation will be calculated at the higher of: (1) the aggregate current maximum offering price of your existing Class A, A1, C, F, and P shares of Eligible Funds; or (2) the aggregate amount you invested in such Shares (including dividend reinvestments but excluding capital appreciation) less any redemptions. You should retain any information and account records necessary to substantiate the historical amounts you and any related Purchasers have invested in Eligible Funds. You must inform the Fund and/or your financial intermediary at the time of purchase if you believe your purchase qualifies for a reduced sales charge and you may be requested to provide documentation of your holdings in order to verify your eligibility as financial intermediaries may have different policies for determining the aggregated holdings of Eligible Funds by related Purchasers. If you do not do so, you may not receive all sales charge reductions for which you are eligible.

· Letter of Intention – In order to reduce your Class A front-end sales charge, a Purchaser may combine purchases of Class A, A1, C, F, and P shares of any Eligible Fund the Purchaser intends to make over the next 13 months in determining the applicable sales charge. The 13-month Letter of Intention period commences on the day that the Letter of Intention is received by the Fund, and the Purchaser must tell the Fund that later purchases are subject to the Letter of Intention. Purchases submitted prior to the date the Letter of Intention is received by the Fund are not counted toward the sales charge reduction. Current holdings under Rights of Accumulation may be included in a Letter of Intention in order to reduce the sales charge for purchases during the 13-month period covered by the Letter of Intention. Shares purchased through reinvestment of dividends or distributions are not included. Class F3, I, R2, R3, R4, R5, and R6 share holdings may not be combined for these purposes. Class A shares valued at 5% of the amount of intended purchases are escrowed and may be redeemed to cover the additional sales charges payable if the intended purchases under the Letter of Intention are not completed. The Letter of Intention is neither a binding obligation on you to buy, nor on the Fund to sell, any or all of the intended purchase amount.

Please retain this document for your future reference.