Astrotech director granted 2,150 restricted shares

Amended Form 4 for ASTC updates a director’s restricted stock grant date and clarifies a three-year vesting schedule through December 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. Winn Charles Arch reported acquisition or exercise transactions in this Form 4 filing.

ASTROTECH Corp (ASTC) reports that director Charles Arch Winn received a grant of 2,150 shares of restricted common stock on September 1, 2026, bringing his direct holdings to 13,100 shares, including 485 shares held in an IRA.

The restricted stock was granted under the Astrotech Corporation 2021 Omnibus Equity Incentive Plan and vests in three equal installments on each of the first three anniversaries of December 13, 2024, becoming fully vested on December 13, 2027, subject to his continuous service. The amendment also corrects the earliest transaction date previously reported.

Insider Trade Summary

Grant/Award: 2,150 shares

Grant/Award 1 txn

Insider Winn Charles Arch

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1, F2	2,150	$0.00	$0.00

Holdings After Transaction: Common Stock — 13,100 shares (Direct)

Footnotes (2)

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 granted shall be fully vested on December 13, 2027, subject to the Reporting Person's continuous service with the Issuer through each such applicable anniversary.
2. F2. Includes 485 shares of common stock held in the Reporting Person's IRA.

Key Figures

Restricted stock granted: 2,150 shares Holdings after transaction: 13,100 shares Shares held in IRA: 485 shares +2 more

5 metrics

Restricted stock granted 2,150 shares Grant of restricted common stock to director on September 1, 2026

Holdings after transaction 13,100 shares Total direct ASTC common stock held by the director after the grant

Shares held in IRA 485 shares Portion of the director’s ASTC common stock held in an IRA

Vesting completion date December 13, 2027 Date when 100% of the 2,150 restricted shares will be fully vested

Vesting period start anniversary December 13, 2024 First of three anniversaries used for vesting schedule of restricted shares

Key Terms

restricted stock, 2021 Omnibus Equity Incentive Plan, IRA, Date of Earliest Transaction

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.

2021 Omnibus Equity Incentive Plan financial

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

IRA financial

"Includes 485 shares of common stock held in the Reporting Person's IRA"

An individual retirement account (IRA) is a savings account designed to help people put aside money for their retirement, often with tax advantages that encourage long-term savings. It matters to investors because it can grow over time, providing financial security later in life, and offers benefits that can reduce current taxes or allow investments to compound more effectively.

Date of Earliest Transaction regulatory

"to restate the Date of Earliest Transaction as September 1, 2026"

FAQ

What insider transaction did ASTC report for director Charles Arch Winn?

ASTROTECH Corp reported that director Charles Arch Winn received a grant of 2,150 shares of restricted common stock on September 1, 2026, increasing his direct holdings to 13,100 shares of ASTC common stock.

How do the restricted shares granted to the ASTC director vest?

The 2,150 restricted shares vest on each of the first three anniversaries of December 13, 2024, so that 100% of the grant is fully vested on December 13, 2027, subject to the director’s continuous service with ASTROTECH Corp.

What total ASTC shareholdings does the director have after this transaction?

After the grant, the director holds 13,100 shares of ASTROTECH Corp common stock directly. This total includes 485 shares of common stock held in his IRA, as noted in the footnotes.

What correction does this amended Form 4/A make for ASTC?

The amendment states that the Date of Earliest Transaction is September 1, 2026. The original Form 4 had erroneously listed December 13, 2024 as the earliest transaction date.

Was the ASTC director’s restricted stock grant made under a Rule 10b5-1 plan?

No. The filing indicates that no Rule 10b5-1 trading plan is reported in connection with this grant of 2,150 shares of restricted ASTC common stock.

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Available on EDGAR 09/08/2026 - 09:05 PM Accepted by SEC EDGAR 09/08/2026 - 09:05 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^*

Winn Charles Arch

(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)
09/01/2026

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)
09/01/2026

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	09/01/2026		A		2,150(1)	A	$0	13,100(2)	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 granted shall be fully vested on December 13, 2027, subject to the Reporting Person's continuous service with the Issuer through each such applicable anniversary.

2. Includes 485 shares of common stock held in the Reporting Person's IRA.

Remarks:

The original Form 4, filed on September 1, 2026, is being amended to restate the Date of Earliest Transaction as September 1, 2026, and clarify the vesting periods of the grant of restricted stock. The original Form 4 erroneously indicated that the Date of Earliest Transaction was December 13, 2024, when, as reported in this amendment, the Date of Earliest Transaction was September 1, 2026.

	/s/ Charles Winn	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)