Neil Lerner - 29 Apr 2026 Form 4/A - Amendment Insider Report for Compass Therapeutics, Inc. (CMPX)

Reporting relationship: Chief Accounting Officer
Issuer ticker: CMPX
Reported as of: 29 Apr 2026
Net transaction value: +$28,350
SEC form: 4/A - Amendment
Accepted by SEC: 30 Apr 2026, 16:00:48 UTC
Original report date: 29 Apr 2026
Prior SEC filing: 05 Jan 2026
Source filing: View source filing
Reporting owner signature: /s/ Neil Lerner

Key filing fact

Neil Lerner filed Form 4/A - Amendment for Compass Therapeutics, Inc. (CMPX) on 30 Apr 2026.

Key facts

This page summarizes Neil Lerner's Form 4/A - Amendment filing for Compass Therapeutics, Inc. (CMPX).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 30 Apr 2026, 16:00.

Change

Previous filing in this sequence was filed on 05 Jan 2026.
Current net transaction value: +$28,350.

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 0001505148 Primary reporting owner

Lerner Neil

Relationship: Chief Accounting Officer
Address: C/O COMPASS THERAPEUTICS, INC., 80 GUEST STREET, SUITE 601, BOSTON
Signature: /s/ Neil Lerner
Signature date: 30 Apr 2026

Reported non-derivative transactions

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

CMPX transaction

Common Stock

Purchase

Transaction value: $28,350
Shares: +15,000
Change %: +3.9%
Price: $1.89
Shares after: 397,500
Date: 29 Apr 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

62,500 of the shares represents unvested restricted stock units ("RSU") granted on January 2, 2026. Each RSU represents a contingent right to receive one share of common stock. The award is subject to service-based vesting conditions and vests in four equal annual installments, with the first installment vested on January 2, 2027.

SEC remarks

Explanatory Note: This amendment is being filed to correct the transaction code reported in Table I of the original Form 4 filed on April 29, 2026. The transaction was inadvertently reported using transaction code A. The correct transaction code is P, which reflects that the transaction was an open market purchase. All other information in the original filing remains unchanged.