Common Stock, par value $.0001

Cross Country Healthcare, Inc.

6551 Park of Commerce Blvd NW, Boca Raton, FL, 33487

Magnetar Financial LLC, a Delaware limited liability company ("Magnetar Financial"), Magnetar Capital Partners LP, a Delaware limited partnership ("Magnetar Capital Partners"), Supernova Management LLC, a Delaware limited liability company ("Supernova Management"), and David J. Snyderman ("Mr. Snyderman") (collectively, the "Reporting Persons").

1603 Orrington Avenue, 13th Floor, Evanston, Illinois 60201

Magnetar Financial is a Securities and Exchange Commission ("SEC") registered investment adviser under Section 203 of the Investment Advisers Act of 1940, as amended, and manager of investment funds and managed accounts. Magnetar Financial serves as investment adviser to each of the Funds. In such capacity, Magnetar Financial exercises voting and investment power over the Shares held for the accounts of each of the Funds. Magnetar Capital Partners serves as the sole member and parent holding company of Magnetar Financial. Supernova Management is the general partner of Magnetar Capital Partners. The manager of Supernova Management is Mr. Snyderman. Magnetar Asset Management LLC ("Magnetar Asset Management") is an SEC registered investment adviser and an affiliate of Magnetar Financial. Magnetar Capital Partners serves as the sole member and parent holding company of Magnetar Asset Management. Each of the Funds is a private investment fund; Magnetar Financial is a privately-held SEC registered investment adviser and manager of investment funds and managed accounts; Magnetar Capital Partners is a privately-held limited partnership and serves as the sole member and parent holding company of Magnetar Financial; Supernova Management is a privately-held limited liability company and is the general partner of Magnetar Capital Partners; and Mr. Snyderman is a citizen of the United States of America, manager of Supernova Management and Chief Executive Officer of Magnetar Financial.

None of the Reporting Persons has, during the last five years, been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction as a result of which such Reporting Person was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws

Magnetar Financial is a Delaware limited liability company. Magnetar Capital Partners is a Delaware limited partnership. Supernova Management is a Delaware limited liability company. Mr. Snyderman is a citizen of the United States of America.

The Company reported in their Form 8-K Report filed December 4, 2024,that 32,227,395shares were outstanding as of December 3, 2024. As of the close of business January 2, 2025, each of the Reporting Persons may have been deemed to have beneficial ownership of 2,324,229 Shares, which consisted of (i) 1,442,879 Shares held for the benefit of the PRA Master Fund and (ii) 615,945 Shares held for the benefit of the Systematic Master Fund, and (iii) 137,207 Shares held for the benefit of the Relative Value Master Fund, and (iv) 128,198 Shares held for the benefit of the Managed Account, and all such Shares represented beneficial ownership of approximately 7.20% of the Shares.

As of the close of business January 2, 2025, each of the Reporting Persons may have been deemed to have beneficial ownership of 2,324,229 Shares, which consisted of (i) 1,442,879 Shares held for the benefit of the PRA Master Fund and (ii) 615,945 Shares held for the benefit of the Systematic Master Fund, and (iii) 137,207 Shares held for the benefit of the Relative Value Master Fund, and (iv) 128,198 Shares held for the benefit of the Managed Account, and all such Shares represented beneficial ownership of approximately 7.20% of the Shares.

Except as set forth on Schedule A attached hereto and Item 6, the Funds had no transactions in the Shares during the 15 days preceding the date of filing of this Statement. All of the transactions set forth on Schedule A attached hereto were effected in the ordinary course of business of Magnetar Financial for the accounts of each of the Funds. The transactions in the Shares set forth on Schedule Awere effected in open market transactions on the NASDAQ and various other trading markets.

No other person is known by the Reporting Persons to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, any Shares that are beneficially owned by the Reporting Persons.