of this Current Report on Form 8-K as Exhibit 99.1. The Company’s management will discuss operations and financial results in an earnings conference call beginning at 4:30 p.m. Eastern time on April 22, 2026. A live audio broadcast of the conference call along with a supplemental presentation will be available to the public through links on the Investor Relations section of the Company’s website (www.asgn.com). The information in this report, including Exhibit 99.1 attached hereto, shall not…

of this Current Report on Form 8-K as Exhibit 99.1. The Company’s management will discuss operations and financial results in an earnings conference call beginning at 4:30 p.m. Eastern time on February 4, 2026. A live audio broadcast of the conference call along with a supplemental presentation will be available to the public through links on the Investor Relations section of the Company’s website (www.asgn.com). The information in this report, including Exhibit 99.1 attached hereto, shall no…

Results of Operations and Financial Condition. On January 20 , 2026 , ASGN Incorporated (the “Company”) issued a press release announcing updates to its previously announced financial estimates for the fourth quarter of 2025 . A copy of the press release is furnished pursuant to

of this Current Report on Form 8-K as Exhibit 99.1. The Company’s management will discuss operations and financial results in an earnings conference call beginning at 4:30 p.m. Eastern time on October 22, 2025. A live audio broadcast of the conference call along with a supplemental presentation will be available to the public through links on the Investor Relations section of the Company’s website (www.asgn.com). The information in this report, including Exhibit 99.1 attached hereto, shall no…

Entry into a Material Definitive Agreement. On July 31, 2025 (the “Effective Date”), ASGN Incorporated (the “Company”) entered into the Second Amendment to its Third Amended and Restated Credit Agreement (the “Second Amendment”), by and among the Company, the lenders party thereto and Wells Fargo Bank, National Association, as administrative agent. The Second Amendment amends the Company’s existing Third Amended and Restated Credit Agreement, dated as of August 31, 2023 (as amended, restated,…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth in

of this Current Report on Form 8-K as Exhibit 99.1. The information in this report, including Exhibit 99.1 attached hereto, shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that Section, and shall not be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific refer…

The filing discloses the approval of amendments to equity incentive and stock purchase plans, which is a compensatory arrangement matter rather than a change in management personnel.

of this Current Report on Form 8-K as Exhibit 99.1. The information in this report, including Exhibit 99.1 attached hereto, shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that Section, and shall not be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific refer…

Unregistered Sales of Equity Securities On March 4, 2025, ASGN Incorporated (the “Company”) completed its previously announced acquisition (the “Acquisition”) of TopBloc Holdings, LLC, a Delaware limited liability company (“TopBloc”). In connection with the Acquisition, the Company issued to certain shareholders of TopBloc 458,283 shares (the “Aggregate Stock Consideration”) of Company common stock, par value $0.01 per share (“Common Stock”), with an aggregate value of approximately $32.79 mi…

President — Sadasivam (Shiv) Iyer: The filing announces the appointment of a new President from an external consulting background, which is a significant executive addition rather than a departure.

of this Current Report on Form 8-K as Exhibit 99.1. The information in this report, including Exhibit 99.1 attached hereto, shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that Section, and shall not be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific refer…

President — Rand Blazer: The President is transitioning to a new senior role as Executive Vice Chairman to assist in leadership transition rather than leaving the company entirely.

of this Current Report on Form 8-K as Exhibit 99.1. The information in this report, including Exhibit 99.1 attached hereto, shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that Section, and shall not be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific refer…

of this Current Report on Form 8-K as Exhibit 99.1. The information in this report, including Exhibit 99.1 attached hereto, shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that Section, and shall not be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific refer…

of this Current Report on Form 8-K as Exhibit 99.1. The information in this report, including Exhibit 99.1 attached hereto, shall not be deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that Section, and shall not be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific refer…

Entry into a Material Definitive Agreement. On March 13, 2024, ASGN Incorporated (the “Company”) entered into a First Amendment to Third Amended and Restated Credit Agreement (the “Amendment”) with Wells Fargo Bank, National Association, as administrative agent, and the lenders party thereto. The Amendment amends the Company’s Third Amended and Restated Credit Agreement, dated as of August 31, 2023 (as amended from time to time, including pursuant to the Third Amendment, the “Credit Agreement…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth in