Compass Therapeutics, Inc.

CMPX·NASDAQ·$2.20Share Price as of 11/2·$304MMarket Cap as of 11/2

Financials

10-QQ2 ended 06/30/2608/06/26 10-QQ1 ended 03/31/2605/05/26 10-KFY 202503/05/26 10-QQ3 ended 09/30/2511/05/25 10-QQ2 ended 06/30/2508/11/25

Disclosures

8-KCurrent report09/22/26 8-KCurrent report08/06/26 8-KCurrent report07/01/26 8-KCurrent report06/23/26 8-KCurrent report06/11/26

Prospectuses and Registrations

S-8Registration of securities for employees03/12/26 S-3Shelf registration12/30/25 424B5Prospectus supplement08/13/25 424B5Prospectus supplement08/12/25 S-8Registration of securities for employees03/27/25

Proxies

DEF 14ADefinitive proxy04/29/26 DEFA14AAdditional proxy materials04/29/26 DEF 14ADefinitive proxy04/29/25 DEFA14AAdditional proxy materials04/29/25 DEFA14AAdditional proxy materials05/29/24

Ownership

Form 4Insider transaction10/02/26 Form 4Insider transaction09/25/26 SC 13G/ABeneficial ownership (amended)08/14/26 SC 13G/ABeneficial ownership (amended)05/15/26 4/AInsider transaction (amended)04/30/26

Other

ARSAnnual report to shareholders04/29/26 EFFECTRequest for effectiveness01/07/26 CORRESPCorrespondence with the SEC01/05/26 UPLOADLetter from the SEC01/02/26 DEL AMDEL AM12/31/25