Neil Lerner - 24 Sep 2026 Form 4 Insider Report for Compass Therapeutics, Inc. (CMPX)

Reporting relationship: Chief Accounting Officer
Issuer ticker: CMPX
Reported as of: 24 Sep 2026
Net transaction value: +$2,850
SEC form: 4
Accepted by SEC: 25 Sep 2026, 08:01:13 UTC
Prior SEC filing: 30 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ Neil Lerner

Key filing fact

Neil Lerner filed Form 4 for Compass Therapeutics, Inc. (CMPX) on 25 Sep 2026.

Key facts

This page summarizes Neil Lerner's Form 4 filing for Compass Therapeutics, Inc. (CMPX).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 25 Sep 2026, 08:01.

Change

Previous filing in this sequence was filed on 30 Apr 2026.
Current net transaction value: +$2,850.

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 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: 25 Sep 2026

Reported non-derivative transactions

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

CMPX transaction

Common Stock

Purchase

Transaction value: $2,850
Shares: +2,500
Change %: +0.63%
Price: $1.14
Shares after: 400,000
Date: 24 Sep 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.