Astrotech director granted 6,006 restricted shares

Halinski John William reported acquisition or exercise transactions in this Form 4 filing.

Accepted by SEC EDGAR 05/18/2026 - 08:22 PM EDT Learn about SEC filing dates

The filer has since corrected this document, so the figures below are the ones originally reported and some of them may have changed. Read the amended Form 4/A for what the company says now.

Rhea-AI Filing Summary

Halinski John William reported acquisition or exercise transactions in this Form 4 filing.

ASTROTECH Corp director John William Halinski received a grant of 6,006 shares of restricted common stock on May 14, 2025 under the Astrotech Corporation 2021 Omnibus Equity Incentive Plan. The award vested in full immediately, bringing his directly held common shares to 9,006 after the grant.

Insider Trade Summary

Grant/Award: 6,006 shares

Grant/Award 1 txn

Insider Halinski John William

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	6,006	$0.00	$0.00

Holdings After Transaction: Common Stock — 9,006 shares (Direct)

Footnotes (1)

1. F1. Represents shares of restricted stock granted to the Reporting Person pursuant to the Astrotech Corporation 2021 Omnibus Equity Incentive Plan. 100% of the shares of restricted stock vested immediately on the grant date.

Key Figures

Restricted stock grant: 6,006 shares Post-transaction holdings: 9,006 shares Grant price per share: $0.0000 per share +1 more

4 metrics

Restricted stock grant 6,006 shares Common Stock awarded to director on May 14, 2025

Post-transaction holdings 9,006 shares Director’s direct common stock ownership after grant

Grant price per share $0.0000 per share Equity compensation, not a market purchase

Transaction code A Grant, award, or other acquisition of non-derivative security

Key Terms

restricted stock, 2021 Omnibus Equity Incentive Plan, vested immediately, Grant, award, or other acquisition

4 terms

restricted stock financial

"Represents shares of restricted stock granted to the Reporting Person pursuant to the Astrotech Corporation 2021 Omnibus Equity Incentive Plan."

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

2021 Omnibus Equity Incentive Plan financial

"Represents shares of restricted stock granted to the Reporting Person pursuant to the Astrotech Corporation 2021 Omnibus Equity Incentive Plan."

vested immediately financial

"100% of the shares of restricted stock vested immediately on the grant date."

Grant, award, or other acquisition regulatory

"transaction_code_description: Grant, award, or other acquisition"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did ASTC director John William Halinski report?

Director John William Halinski reported receiving a grant of 6,006 shares of restricted common stock. The grant was made under Astrotech’s 2021 Omnibus Equity Incentive Plan as equity compensation rather than a market purchase of shares.

When did John William Halinski receive the 6,006 ASTC restricted shares?

The 6,006 restricted shares of Astrotech common stock were granted to John William Halinski on May 14, 2025. This date marks both the grant and immediate vesting of the award according to the Form 4 footnote disclosure.

Did the restricted stock grant to Halinski vest immediately?

Yes. The Form 4 footnote states that 100% of the 6,006 restricted shares vested immediately on the grant date. This means Halinski’s award became fully earned and no longer subject to vesting conditions on May 14, 2025.

How many ASTC shares does Halinski hold after this Form 4 transaction?

Following the restricted stock award, John William Halinski directly holds 9,006 shares of Astrotech common stock. The post-transaction balance reported on the Form 4 reflects his total direct ownership after adding the 6,006 granted shares.

Was Halinski’s ASTC restricted stock grant a market purchase?

No. The transaction is coded as an award acquisition with a price of $0.0000 per share. It represents equity compensation granted under Astrotech’s 2021 Omnibus Equity Incentive Plan, not an open-market purchase of common stock.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Halinski John William

(Last) (First) (Middle)

1817 W. BRAKER LN.

SUITE 400

(Street)

AUSTIN TEXAS 78758

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ASTROTECH Corp [ ASTC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/14/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/14/2025		A		6,006(1)	A	$0	9,006	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents shares of restricted stock granted to the Reporting Person pursuant to the Astrotech Corporation 2021 Omnibus Equity Incentive Plan. 100% of the shares of restricted stock vested immediately on the grant date.

	/s/ John Halinski	05/18/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)