John William Halinski - 16 Jul 2026 Form 4/A - Amendment Insider Report for ASTROTECH Corp (ASTC)

Reporting relationship: Director
Issuer ticker: ASTC
Reported as of: 16 Jul 2026
Net transaction value: $0
SEC form: 4/A - Amendment
Accepted by SEC: 08 Sep 2026, 21:09:04 UTC
Original report date: 20 Jul 2026
Prior SEC filing: 21 Jul 2026
Source filing: View source filing
Reporting owner signature: /s/ John Halinski

Key filing fact

John William Halinski filed Form 4/A - Amendment for ASTROTECH Corp (ASTC) on 08 Sep 2026.

Key facts

This page summarizes John William Halinski's Form 4/A - Amendment filing for ASTROTECH Corp (ASTC).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 08 Sep 2026, 21:09.

Change

Previous filing in this sequence was filed on 21 Jul 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4/A - Amendment disclosures.

View source filing

Reporting Owners (1)

CIK 0002049376 Primary reporting owner

Halinski John William

Relationship: Director
Address: 1817 W. BRAKER LN., SUITE 400, AUSTIN
Signature: /s/ John Halinski
Signature date: 08 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ASTC transaction

Common Stock

Award

Transaction value
Shares: +2,150
Change %: +21%
Price: $0.000000^*
Shares after: 12,211
Date: 16 Jul 2026
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote 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.

SEC 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.