CMPX · Insider trading · 13F holders · Congress trades
Compass Therapeutics, Inc. (CMPX)
Who is buying and selling CMPX: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 13
- Insider buys, 90 days
- $21K
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 0
CMPX at a glance
- Between Aug 1, 2026 and Oct 29, 2026, 1 CMPX insider filed 2 open-market purchases worth $21K on SEC Form 4.
- 13 13F filers hold CMPX among their 50 largest positions, worth $168.8M combined. The biggest bets by portfolio weight are Tang Capital Management LLC (1.8%), Palo Alto Investors LP (1.8%) and Birchview Capital, LP (1.7%). In their latest 13Fs, 2 managers opened a new position and 6 added to one.
- No member of Congress has disclosed a trade in CMPX.
- CMPX last closed at $0.76 on Oct 29, 2026.
CMPX insider trading
Between Aug 1, 2026 and Oct 29, 2026, 1 CMPX insider filed 2 open-market purchases worth $21K on SEC Form 4.
| Filed | Insider | Role | Trade | Shares | Price | Value | Form 4 |
|---|---|---|---|---|---|---|---|
| Oct 2, 2026 | Lerner Neil | Chief Accounting Officer | Buy | 20,000 | $0.92 | $18K | SEC |
| Sep 25, 2026 | Lerner Neil | Chief Accounting Officer | Buy | 2,500 | $1.14 | $3K | SEC |
Who owns CMPX? Hedge funds and superinvestors
13 13F filers hold CMPX among their 50 largest positions, worth $168.8M combined. The biggest bets by portfolio weight are Tang Capital Management LLC (1.8%), Palo Alto Investors LP (1.8%) and Birchview Capital, LP (1.7%). In their latest 13Fs, 2 managers opened a new position and 6 added to one.
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Tang Capital Management LLCHedge fund | 1.8% | $39.4M | 17,990,782 | +7.1% shares | Q2 2026 |
| Orbimed Advisors LLCHedge fund | 0.6% | $33.3M | 15,219,994 | +0.0% shares | Q2 2026 |
| Montanova Capital, LLCHedge fund | 0.6% | $30.9M | 14,101,159 | -1.4% shares | Q2 2026 |
| Enavate Sciences Gp, LLCInvestment manager | 4.9% | $17.1M | 7,788,150 | +0.0% shares | Q2 2026 |
| Vivo Capital, LLCHedge fund | 1.6% | $17.0M | 7,757,060 | -18.7% shares | Q2 2026 |
| Palo Alto Investors LPHedge fund | 1.8% | $12.8M | 5,831,813 | +285.1% shares | Q2 2026 |
| Blue Owl Capital Holdings LPHedge fund | 1.2% | $7.9M | 3,624,076 | +23.2% shares | Q2 2026 |
| Birchview Capital, LPWealth manager | 1.7% | $3.7M | 1,675,000 | +14.3% shares | Q2 2026 |
| Atle Fund Management ABAsset manager | 0.6% | $2.3M | 1,048,593 | +2406.7% shares | Q2 2026 |
| KVP Capital Advisors, LPHedge fund | 1.2% | $1.7M | 771,000 | +54.2% shares | Q2 2026 |
| Acuta Capital Partners, LLCHedge fund | 0.9% | $1.3M | 595,213 | -29.9% shares | Q2 2026 |
| Artia Global Partners LPHedge fund | 0.2% | $839K | 383,200 | New | Q2 2026 |
| Exome Asset Management LLCHedge fund | 0.4% | $605K | 276,165 | New | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 13). Screen CMPX in the grand portfolio →
CMPX stock trades by members of Congress
No member of Congress has disclosed a trade in CMPX.
CMPX questions and answers
Are insiders buying CMPX stock?
Between Aug 1, 2026 and Oct 29, 2026, 1 CMPX insider filed 2 open-market purchases worth $21K on SEC Form 4.
Which hedge funds own CMPX?
13 13F filers hold CMPX among their 50 largest positions, worth $168.8M combined. The biggest bets by portfolio weight are Tang Capital Management LLC (1.8%), Palo Alto Investors LP (1.8%) and Birchview Capital, LP (1.7%). In their latest 13Fs, 2 managers opened a new position and 6 added to one.
Has Congress traded CMPX?
No member of Congress has disclosed a trade in CMPX.
Who is the largest holder of CMPX?
Among 13F filers, Tang Capital Management LLC reports the largest CMPX position, $39.4M (17,990,782 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Tang Capital Management LLC's: 1.8% of its portfolio.
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