Company: NSP
Filing Date: 2025-08-01
Form Type: S-8
Source: 0001000753-25-000071
Chunk: 1

Company: INSPERITY, INC.
Filing Date: 2025-08-01
Form: S-8
Chunk 1
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 complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ¨

### REGISTRATION OF ADDITIONAL SECURITIES
Insperity, Inc. (the “Company” or the “Registrant”) previously registered 5,074,005 of its common stock, par value $0.01 per share (the “Shares” or “Common Stock”), available for grant of awards pursuant to the Insperity, Inc. Incentive Plan (the “Plan”), formerly known as the Insperity, Inc. 2012 Incentive Plan, as amended and restated effective June 16, 2017, as further amended effective December 30, 2019, as amended and restated effective May 22, 2023 and as further amended effective May 20, 2025. The registration of these Shares was filed on (a) a Form S-8 Registration Statement with the Securities and Exchange Commission (“SEC”) on May 21, 2012 (File Number 333-181569), (b) a Form S-8 Registration Statement with the SEC on November 3, 2017 (File Number 333-221310) and (c) a Form S-8 Registration Statement filed with the SEC on August 4, 2023 (File Number 333-273717) (collectively, the “Prior Registration Statements”), in accordance with the Securities Act of 1933, as amended.

The Registrant’s Board of Directors adopted, and on May 20, 2025 the shareholders of the Registrant approved, an amendment to the Plan to provide that, among other things, an additional 690,000 Shares be available for issuance under the Plan.

This Registration Statement relates to securities of the same class as those to which the Prior Registration Statements relate, and is submitted in accordance with General Instruction E to Form S-8 regarding Registration of Additional Securities. Pursuant to Instruction E of Form S-8, the contents of the Prior Registration Statements are incorporated herein by reference and made part of this Registration Statement, except as amended hereby.

# PART II

### INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

## Item 8. Exhibits.
| Exhibit Number |     | * 
 * |  4.1 
  4.2 |     | Exhibit                                                                                                                                                                                                           
 Amended and Restated Certificate of Incorporation (incorporated by reference to Exhibit 3.1 to