Astrotech director granted 2,150 restricted shares

Astrotech Corp corrected director John William Halinski’s reported holdings and detailed a 2,150-share restricted stock grant vesting through December 13, 2027.

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 2,150 shares of restricted Common Stock on July 16, 2026 under the Astrotech Corporation 2021 Omnibus Equity Incentive Plan at no cash cost. This amendment corrects his post-transaction holdings to 12,211 shares beneficially owned, an increase of 1,055 shares from what was previously reported due to an administrative error. The restricted shares vest in three installments on each of the first three anniversaries of December 13, 2024, so that they are fully vested on December 13, 2027, subject to his continuous service with the company.

Insider Trade Summary

Grant/Award: 2,150 shares

Grant/Award 1 txn

Insider Halinski John William

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1	2,150	$0.00	$0.00

Holdings After Transaction: Common Stock — 12,211 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. The shares of restricted stock vest on each of the first three anniversaries of December 13, 2024, such that 100% of the shares of restricted stock shall be fully vested on December 13, 2027, subject to the Reporting Person's continuous service with the Issuer through each such applicable anniversary.

Key Figures

Restricted stock granted: 2,150 shares Price per share for grant: $0.00 per share Shares beneficially owned after transaction: 12,211 shares +2 more

5 metrics

Restricted stock granted 2,150 shares Grant of restricted Common Stock on July 16, 2026

Price per share for grant $0.00 per share Restricted stock grant to director John William Halinski

Shares beneficially owned after transaction 12,211 shares Director’s holdings following the July 16, 2026 grant, as corrected in this amendment

Correction to prior reported holdings 1,055 shares Amount by which the original Form 4 understated beneficial ownership

Full vesting date December 13, 2027 Date when 100% of the 2,150 restricted shares will be fully vested, subject to continuous service

Key Terms

restricted stock, beneficially owned, 2021 Omnibus Equity Incentive Plan, continuous service

4 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.

beneficially owned financial

"to reflect 12,211 shares beneficially owned by the Reporting Person"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

2021 Omnibus Equity Incentive Plan financial

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

continuous service regulatory

"subject to the Reporting Person's continuous service with the Issuer"

FAQ

What insider transaction did ASTC report for John William Halinski in this Form 4/A?

The filing reports that director John William Halinski received a grant of 2,150 shares of restricted Common Stock on July 16, 2026 under the Astrotech Corporation 2021 Omnibus Equity Incentive Plan, with no cash price per share reported for the grant.

How many ASTC shares does John William Halinski beneficially own after the reported transaction?

After the reported restricted stock grant, John William Halinski is shown as beneficially owning 12,211 shares of Astrotech Corp Common Stock. This Form 4/A corrects the previously understated ownership total by 1,055 shares due to an administrative error.

What is the vesting schedule for the 2,150 restricted ASTC shares granted to Halinski?

The 2,150 restricted shares vest on each of the first three anniversaries of December 13, 2024, with 100% fully vested by December 13, 2027. Vesting is explicitly subject to Halinski’s continuous service with Astrotech Corp through each applicable anniversary date.

Did the ASTC filing indicate use of a Rule 10b5-1 trading plan for this transaction?

No. The filing’s Rule 10b5-1 checkbox is not checked, and the data indicate no affirmation that this grant or related holdings were made under a Rule 10b5-1 trading plan or similar pre-arranged trading arrangement.

What type of security was granted to Halinski in the ASTC Form 4/A?

The reported transaction involves Common Stock in the form of restricted stock granted pursuant to the Astrotech Corporation 2021 Omnibus Equity Incentive Plan. These shares carry vesting conditions rather than being immediately and unconditionally transferable.

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

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Available on EDGAR 09/08/2026 - 09:09 PM Accepted by SEC EDGAR 09/08/2026 - 09:09 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)
07/16/2026

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)
07/20/2026

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	07/16/2026		A		2,150(1)	A	$0	12,211	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. The shares of restricted stock vest on each of the first three anniversaries of December 13, 2024, such that 100% of the shares of restricted stock shall be fully vested on December 13, 2027, subject to the Reporting Person's continuous service with the Issuer through each such applicable anniversary.

Remarks:

The original Form 4, filed on July 20, 2026, is being amended to correct the ownership total in Table I, Column 5 to reflect 12,211 shares beneficially owned by the Reporting Person following the reported transaction and correct the vesting periods of the grant of restricted stock. The original Form 4 understated the ownership total in Table I, Column 5 by 1,055 shares due to an administrative error. In addition, the original Form 4 erroneously indicated that the shares of restricted stock would vest in equal installments on each of the first three anniversaries of July 16, 2026, when, as reported in this amendment, the shares of restricted stock vest on each of the first three anniversaries of December 13, 2024, such that 100% of the shares of restricted stock granted shall be fully vested on December 13, 2027.

	/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)