Company: ASGN
Filing Date: 2025-04-11
Form Type: PRE 14A
Source: 0000890564-25-000017
Chunk: 3

Company: ASGN Inc
Filing Date: 2025-04-11
Form: PRE 14A
Chunk 3
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 Find Additional Information                                                                                              |     |     |     |  61 |
| Narrative to Summary Compensation Table and Grants of Plan-Based Awards Table |     | 36 |     | Incorporation by Reference                                                                                                             |     |     |     |  61 |
| Outstanding Equity Awards at Fiscal Year End                                  |     | 37 |     | Proposals by Stockholders                                                                                                              |     |     |     |  61 |
| Option Exercises and Stock Vested                                             |     | 38 |     | Miscellaneous                                                                                                                          |     |     |     |  62 |
| Non-Qualified Deferred Compensation                                           |     | 38 |     | Annex A – Reconciliation of Performance Target                                                                                         |     | A-1 |     |     |
| Payments Upon Termination or Change in Control                                |     | 39 |     | Annex B – First Amendment to the Company's Second Amended and Restated 2010 Incentive Award Plan                                       |     |     |     | B-1 |
| CEO Pay Ratio                                                                 |     | 41 |     | Annex C – First Amendment to the Company's Second Amended and Restated 2010 Employee Stock Purchase Plan                               |     |     |     | C-1 |

<div align='center'>i</div>

#### ASGN Incorporated

#### 4400 Cox Road, Suite 110

#### Glen Allen, Virginia 23060

### PROXY STATEMENT
<div align='center'>For the Annual Meeting of Stockholders to be Held on

Thursday, June 12, 2025</div>

ASGN Incorporated (the “Company,” “ASGN,” “we,” “our,” or “us”) is providing these proxy materials in connection with the solicitation by the Board of Directors (the “Board”) of ASGN of proxies to be voted at our 2025 Annual Meeting of Stockholders (the “Annual Meeting”) to be held on Thursday, June 12, 2025 at 9:00 a.m. Eastern Time , or at any adjournment or postponement thereof. A Notice of 2025 Annual Meeting of Stockholders (the “Notice”) will be mailed to each stockholder entitled to vote at the Annual Meeting commencing on or about April 24, 2025.

Proxy Summary

This summary highlights information contained elsewhere in this Proxy Statement. Please refer to this complete document and our 2024 Annual Report.

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#### Annual Meeting of Stockholders