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CMPX · Compass Therapeutics, Inc.

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$2.53 +0.13 (+5.42%) At close · Aug 25
Market Cap
$455.62M
Shares
180.09M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 213
Total Value: $363,373,894
Total Shares: 165,924,212

Institutional Ownership Trend

19 quarters

Holder Concentration

Across 213 13F filers · Δ vs Mar 31, 2026
Top Holder
10.8%
Sep 2023 → Jun 2026 · range 9.5% – 26.0%
+1.3 pts
Top 5
41.3%
Sep 2023 → Jun 2026 · range 37.0% – 60.7%
+4.3 pts
Top 10
60.7%
Sep 2023 → Jun 2026 · range 57.8% – 83.3%
+2.9 pts
HHI
483
Sep 2023 → Jun 2026 · range 420 – 1,107
Broadly held+62

Quarterly Activity

vs Mar 31, 2026
New
63
Increased
86
Decreased
43
Sold Out
54
Unchanged
21
Holder count: +9
Institutional value: -61.1%
Shares held: -6.1%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 218
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1738021 CUSIP 20454B104 13F (30d) 194 filings 193 filers Visit website