Company: ASGN
Filing Date: 2025-04-24
Form Type: DEF 14A
Source: 0000890564-25-000021
Chunk: 1

Company: ASGN Inc
Filing Date: 2025-04-24
Form: DEF 14A
Chunk 1
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's First Amendment to the Second Amended and Restated 2010 Employee Stock Purchase Plan;                                                                               |
| 5. |     | the ratification of the appointment of Deloitte & Touche LLP as our independent registered public accounting firm for the year ending December 31, 2025; and                                  |
| 6. |     | such other business as may properly come before the Annual Meeting or any adjournments or postponements thereof.                                                                              |

The Annual Meeting will be held on Thursday, June 12, 2025, at 9:00 a.m. Eastern Time, at the Mandarin Oriental Boston located at 776 Boylston Street, Boston, MA 02199. The Notice of Annual Meeting of Stockholders and Proxy Statement accompanying this letter describes the business to be acted upon, which you are urged to read carefully.

Please promptly vote your shares by telephone, using the Internet, or by signing and returning your proxy in the enclosed envelope.

Your vote is important no matter how many shares you own. In order to ensure that your shares will be represented at the Annual Meeting, please vote your shares using one of the voting instruments available to you. If you attend the Annual Meeting and desire to vote in person, you may do so even though you have previously submitted your proxy card.

We thank you for your continued interest in ASGN and look forward to seeing you at the Annual Meeting.

| Sincerely,              |
| /s/ Theodore S. Hanson  |
| Theodore S. Hanson      |
| Chief Executive Officer |

<div align='center'>4400 Cox Road, Suite 110

Glen Allen, Virginia 23060</div>

### NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
<div align='center'>to be held on Thursday, June 12, 2025</div>

The 2025 Annual Meeting of Stockholders of ASGN Incorporated (the "Company" or "ASGN") will be held on Thursday, June 12, 2025, at 9:00 a.m. Eastern Time, for the purpose of considering and voting upon:

| 1. 
 2. 
 3. |     | the election of Brian J. Callaghan, Theodore S. Hanson, Maria R. Hawthorne and Edwin A. Sheridan, IV, as directors for three-year terms to expire at our 2028 Annual Meeting of Stockholders; 
 an advisory vote to approve the Company's named executive officer compensation for the year ended December 31