Astrotech director granted 6,006 restricted shares

Astrotech director John William Halinski received an immediately vested grant of 6,006 restricted shares, and the Form 4 amendment corrects the transaction date to April 14, 2026.

This filing corrects an earlier one, and you can read the original Form 4 if you want to see what changed.

Rhea-AI Filing Summary

ASTROTECH Corp (symbol: ASTC) is the issuer of record for a Form 4/A filing submitted to the SEC. Halinski John William reported acquisition or exercise transactions in this Form 4 filing.

ASTROTECH Corp (ASTC) reported that director John William Halinski received a grant of 6,006 shares of common stock as restricted stock on April 14, 2026 under the Astrotech Corporation 2021 Omnibus Equity Incentive Plan, with 100% of the shares vesting immediately on the grant date.

This amendment to a prior Form 4 corrects the transaction date, which was previously reported as May 14, 2025; following the grant, Halinski directly holds 9,006 shares of ASTC common stock, and no Rule 10b5-1 trading plan is reported.

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 F1	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 granted: 6,006 shares Shares held after transaction: 9,006 shares Grant price per share: $0.00 per share

3 metrics

Restricted stock granted 6,006 shares Grant to director John William Halinski on April 14, 2026

Shares held after transaction 9,006 shares Direct holdings of John William Halinski following the grant

Grant price per share $0.00 per share Reported price for the 6,006-share restricted stock grant

Key Terms

restricted stock, Astrotech Corporation 2021 Omnibus Equity Incentive Plan, vested

3 terms

restricted stock financial

"Represents shares of restricted stock granted to the Reporting Person"

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.

Astrotech Corporation 2021 Omnibus Equity Incentive Plan financial

"pursuant to the Astrotech Corporation 2021 Omnibus Equity Incentive Plan"

vested financial

"100% of the shares of restricted stock vested immediately"

FAQ

What insider transaction did ASTC disclose for director John William Halinski?

ASTROTECH Corp disclosed that director John William Halinski received a grant of 6,006 shares of restricted common stock on April 14, 2026, under the Astrotech Corporation 2021 Omnibus Equity Incentive Plan, with all shares vesting immediately on the grant date.

Why was the Form 4/A amendment filed for ASTC?

The amendment was filed to correct the transaction date in Table I. The original Form 4 reported May 14, 2025, but the correct transaction date for the 6,006-share restricted stock grant is April 14, 2026.

How many ASTC shares does John William Halinski hold after this transaction?

After the April 14, 2026 restricted stock grant, John William Halinski directly holds 9,006 shares of ASTROTECH Corp common stock, as reported in the Form 4/A amendment.

Was the ASTC insider transaction made under a Rule 10b5-1 trading plan?

No. The filing indicates that no Rule 10b5-1 trading plan applies to this transaction, meaning the grant was not reported as executed under a pre-arranged trading plan.

What are the vesting terms of the ASTC restricted stock granted to Halinski?

The 6,006 shares of restricted stock granted to John William Halinski under the Astrotech Corporation 2021 Omnibus Equity Incentive Plan vested 100% immediately on the grant date of April 14, 2026.

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

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Available on EDGAR 09/08/2026 - 09:07 PM Accepted by SEC EDGAR 09/08/2026 - 09:06 PM Learn about SEC filing dates

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)
05/18/2026

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	04/14/2026		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.

Remarks:

The original Form 4, filed on May 18, 2026, is being amended to restate the Transaction Date in Table I as April 14, 2026. The original Form 4 erroneously indicated that the Transaction Date in Table I was May 14, 2025, when, as reported in this amendment, the Transaction Date under Table I was April 14, 2026.

	/s/ John Halinski	09/08/2026
	** 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)