LYTIR

Company · CMPX

Compass Therapeutics, Inc.

Nasdaq's symbol directory lists CMPX on Nasdaq as “Compass Therapeutics, Inc. - Common Stock”.

In the 12 months to Nov 8, 2026: insiders bought on 2 occasions ($21K); 2 filings by holders of 5% or more; 1 company report (Form 8-K, since May 26, 2026).

All insider filings at the SEC

Insider purchases and sales, by month (last 12 months)Insider purchases: $21K in total; Insider sales: $0 in total.Sep: Insider purchases $3KOct: Insider purchases $18KDecJanFebMarAprMayJunJulAugSepOctNov
Insider purchases above the line: $21KInsider sales below: $0
Dollar value of open-market purchases and sales reported on SEC Form 4, by the month traded. Sales include pre-arranged 10b5-1 plan sales.

Insider trades · SEC Form 4

Those inside the hall

Open-market purchases and sales only. Legs one person filed for one day are combined.

Who traded

  1. Neil Lerner, Chief Accounting Officer bought on 2 days latest Oct 1, 2026 bought $21K
Every trade (2)
  1. BUYNeil Lerner, Chief Accounting Officer bought Oct 1, 2026 20,000 shares filing $18K
  2. BUYNeil Lerner, Chief Accounting Officer bought Sep 24, 2026 2,500 shares filing $3K

Large holders · SEC Schedules 13D and 13G

Five percent and over

Anyone who comes to hold more than 5% of a company's voting shares must tell the SEC. A Schedule 13D is filed by a holder who may seek to influence the company; a 13G by one who states it is a passive investor. An amendment updates an earlier filing, and a stake reported as 0% means the holder says it has sold all, or nearly all, of its shares. Every recent 13D and 13G

  1. Vivo Opportunity Fund Holdings, L.P. filed Aug 14, 2026 Schedule 13G/A passive filing 4%
  2. STATE STREET CORPORATION filed Aug 7, 2026 Schedule 13G passive 9,953,653 shares filing 5.5%

Company reports · SEC Form 8-K

In its own words

Current reports the company filed with the SEC; most items are due within four business days of the event. Each line lists the report's items by the SEC's own titles; the filing says what happened. Reports collected since May 26, 2026; every 8-K at the SEC.

  1. Regulation FD disclosure filing Sep 22, 2026

Sources: SEC EDGAR (Forms 4, 144 and 8-K) and STOCK Act periodic transaction reports. Filings can be late, amended or wrong at the source; see methodology.