Astrotech director granted 2,150 restricted shares

Amended Form 4 for ASTC’s director updates beneficial ownership totals and corrects the vesting schedule for a prior restricted stock grant.

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. Stober Eric reported acquisition or exercise transactions in this Form 4 filing.

ASTROTECH Corp (ASTC) reports that director Eric Stober received a grant of 2,150 shares of restricted common stock on July 16, 2026 at $0.00 per share under the Astrotech Corporation 2021 Omnibus Equity Incentive Plan. This amendment corrects his beneficial ownership to 19,654 shares following the grant, an increase of 1,167 shares from what was previously reported, and clarifies that the restricted shares vest in three annual installments on each of the first three anniversaries of December 13, 2024, becoming fully vested on December 13, 2027, subject to his continuous service.

Insider Trade Summary

Grant/Award: 2,150 shares

Grant/Award 1 txn

Insider Stober Eric

Role Director

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

Holdings After Transaction: Common Stock — 19,654 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 Grant price per share: $0.00 per share Shares beneficially owned after transaction: 19,654 shares +2 more

5 metrics

Restricted stock granted 2,150 shares Grant of common stock to Eric Stober on July 16, 2026

Grant price per share $0.00 per share Restricted stock grant on July 16, 2026

Shares beneficially owned after transaction 19,654 shares Total common stock beneficially owned by Eric Stober after the grant

Ownership understatement corrected 1,167 shares Amount by which the original Form 4 understated beneficial ownership

Final vesting date December 13, 2027 Date when 100% of the restricted stock will be fully vested

Key Terms

restricted stock, beneficially owned, vesting, 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 19,654 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.

vesting financial

"The shares of restricted stock vest on each of the first three anniversaries"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

continuous service financial

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

FAQ

What change does this Form 4/A report for ASTC director Eric Stober?

It reports a grant of 2,150 restricted shares of ASTROTECH Corp common stock on July 16, 2026 and corrects his beneficial ownership to 19,654 shares following the transaction, fixing an earlier understatement of 1,167 shares due to an administrative error.

How many ASTC shares does Eric Stober beneficially own after this amendment?

After the corrected reporting, Eric Stober beneficially owns 19,654 shares of ASTROTECH Corp common stock following the July 16, 2026 restricted stock grant.

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

The 2,150 restricted shares vest on each of the first three anniversaries of December 13, 2024, so that 100% vest by December 13, 2027, subject to Eric Stober’s continuous service with ASTROTECH Corp through each vesting date.

Did ASTC’s director pay anything for the restricted stock grant?

No. The 2,150 shares of restricted common stock granted to Eric Stober on July 16, 2026 were reported at a price of $0.00 per share, consistent with a typical equity incentive award.

Was this ASTC Form 4/A filed under a Rule 10b5-1 trading plan?

No. The filing indicates that the Rule 10b5-1 checkbox is not selected, so the reported grant was not made pursuant to a Rule 10b5-1 trading plan.

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

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Available on EDGAR 09/08/2026 - 09:15 PM Accepted by SEC EDGAR 09/08/2026 - 09:15 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^*

Stober Eric

(Last) (First) (Middle)

1817 W. BRAKER LN, STE 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	19,654	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 19,654 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 1,167 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/ Eric Stober	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)