Company: KELYB
Filing Date: 2025-08-07
Form Type: 8-K/A
Source: 0001193125-25-175269
Chunk: 3

Company: KELLY SERVICES INC
Filing Date: 2025-08-07
Form: 8-K/A
Chunk 3
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 a period of twenty-four months and a prorated portion of his annual incentive compensation for the fiscal year in which the termination occurred, based on performance results. For a qualified termination that occurs in connection with a change in control, Mr. Layden would be eligible to receive a lump sum severance payment equal to two times the sum of his annual base salary and target annual incentive compensation, plus a prorated portion of his annual incentive compensation.

Mr. Layden will be entitled to participate in certain other employment benefits available to the Company’s senior executive officers, including relocation assistance, group life and healthcare insurance and participation in the Company’s Management Retirement Plan, a non-qualifieddefined contribution deferred compensation plan for highly compensated employees. Mr. Layden will be subject to the Company’s stock ownership requirements applicable to executive officers as well as the Company’s share trading blackout and pre-clearancepolicies and Incentive Compensation Recovery (“Clawback”) Policy. The foregoing description does not purport to be complete and is qualified in its entirety by reference to the full text of the Offer Letter, which is attached as Exhibit 10.1 and incorporated herein by reference.

| Item 9.01 | Financial Statements and Exhibits. |

(d) Exhibits

| ExhibitNo. 
 10.1       
 99.1       |     | Description                                                                
 Offer Letter between Kelly Services, Inc. and Christopher Layden.*         
 Press release dated August 7, 2025 issued by Kelly Services, Inc.          |
|:-----------|:----|:---------------------------------------------------------------------------|
| 104        |     | Cover Page Interactive Data File (embedded with the Inline XBRL document). |

| * | Portions of this exhibit have been omitted pursuant to Item 601(b)(10)(iv) of RegulationS-K. |

SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

| Date: August 7, 2025 |     | KELLY SERVICES, INC.                                              
 /s/ Vanessa P. Williams                                           |
|:---------------------|:----|:------------------------------------------------------------------|
|                      |     | Vanessa P. Williams                                               |
|                      |     | Executive Vice President, General Counsel and Corporate Secretary |