Company: NSP
Filing Date: 2025-08-14
Form Type: 8-A12B
Source: 0001000753-25-000092
Chunk: 0

Company: INSPERITY, INC.
Filing Date: 2025-08-14
Form: 8-A12B
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### FORM 8-A

### FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES

#### PURSUANT TO SECTION 12(b) OR (g) OF THE

#### SECURITIES EXCHANGE ACT OF 1934

#### INSPERITY, INC.
<div align='center'>(Exact name of registrant as specified in its charter)</div>

| Delaware                                                       |     | 76-0479645                             |
| (State or other jurisdiction of incorporation or organization) |     | -I.R.S. Employer Identification Number |

| 19001 Crescent Springs Drive            
 Kingwood, Texas                         |     |     77339 |
| (Address of principal executive office) |     | -Zip Code |

Securities to be registered pursuant to Section 12(b) of the Act:

| Title of each class to be so registered |     | Name of each exchange on which 
 each class is to be registered |
| Common stock, par value $0.01 per share |     | The NYSE Texas, Inc.           |

If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c) or (e), check the following box. ☒

If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d) or (e), check the following box. ☐

If this form relates to the registration of a class of securities concurrently with a Registration A offering, check the following box. ☐

| Securities Act registration statement or Regulation A offering statement file number to which this form relates: N/A |

Securities to be registered pursuant to Section 12(g) of the Act: N/A

### EXPLANATORY NOTE
This Registration Statement on Form 8-A (this "Form 8-A") is being filed by Insperity, Inc. (the "

#### Company
"), with the Securities and Exchange Commission (the "

#### SEC
") in connection with the dual listing of its common stock, par value $0.01 per share (the "

#### Common Stock
"), with NYSE Texas, Inc. under the trading symbol "NSP." The Common Stock is currently listed on the New York Stock Exchange under the symbol "NSP."

|