Company: ASGN
Filing Date: 2025-02-27
Form Type: S-8
Source: 0000890564-25-000009
Chunk: 0

Company: ASGN Inc
Filing Date: 2025-02-27
Form: S-8
Chunk 0
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<div align='center'>AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON February 26, 2025</div>

#### Registration No. 333-

### UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### FORM S-8
<div align='center'>REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933</div>

#### ASGN Incorporated
<div align='center'>(Exact Name of Registrant as Specified in Its Charter)</div>

| Delaware                                                      |     | 95-4023433                          |
| (State or other jurisdiction of incorporation ororganization) |     | -I.R.S. Employer Identification No. |

#### 4400 Cox Road, Suite 110

#### Glen Allen, Virginia 2360
(888) 482-8068

<div align='center'>(Address, Including Zip Code, and Telephone Number, Including Area Code, of Registrant’s Principal Executive Office)

Second Amendment to the Second Amended and Restated ASGN Incorporated
2012 Employment Inducement Incentive Award Plan

(Full title of the plan(s))</div>

#### ASGN Incorporated

#### Jennifer Hankes Painter

#### Senior
<div align='center'>Vice President, Chief Legal Officer and Secretary
26745 Malibu Hills Road
Calabasas, California 91301
(818) 878-7900

Copy to:

Steven B. Stokdyk, Esq.
Latham & Watkins LLP
10250 Constellation Blvd. Suite 1100
Los Angeles, California 90067
(424) 653-5500 (Name, address and telephone number, including area code, of agent for service)</div>

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

| Large accelerated filer                                            |     | Accelerated filer         |
| Non-accelerated filer(Do not check if a smaller reporting company) |     | Smaller reporting company |
|                                                                    |     | Emerging growth company   |

If an emerging growth company, indicate by check mark if the