Company: ASGN
Filing Date: 2025-06-17
Form Type: S-8
Source: 0000890564-25-000033
Chunk: 0

Company: ASGN Inc
Filing Date: 2025-06-17
Form: S-8
Chunk 0
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<div align='center'>AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JUNE 16, 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 23060
<div align='center'>(Address of Principal Executive Offices) (Zip Code)

Second Amended and Restated ASGN Incorporated 2010 Incentive Award Plan

Second Amended and Restated 2010 Employee Stock Purchase 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

(Name and address of agent for service)

(818) 878-7900

(Telephone number, including area code, of agent for service)

Copy to:

Steven B. Stokdyk, Esq.
Latham & Watkins LLP
10250 Constellation Blvd. Suite 1100
Los Angeles, California 90067
(424) 653-5500</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   |     | Smaller reporting company |
|                         |     | Emerging growth company   |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised