CMPX in the 13F filings

Compass Therapeutics Inc · CUSIP 20454B104

Sector · Pharmaceuticals and biotechnology Theme · Biological products Theme · Healthcare: biopharma and medtech· L3VLUP-defined

Quarter

Q1 2026 Q4 2023 Q4 2022 Q1 2022 Q4 2021

Quarter end: 31 Mar 2026; the date the book describes
Filed: 27 Oct 2026; latest of these filings; the earliest 12 May 2026
Managers listing it: 20; at least, of 95 tracked, among listed positions
Comparable managers: 91; filed both Q4 2025 and Q1 2026; 0 listed it in both
Shares listed: 6,931,795; combined, among listed positions
Reported value: $37m; combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 14 buyers (opened or added shares) and 9 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -3,501,574.

Managers listing CMPX in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

ActionShare of book at least

20 of 20 holders

				Action		Filing
Fidelity (FMR LLC)	1,801,721	$9.5m	under 0.1%	Trimmed	-777,990	15 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC	1,119,090	$5.9m	under 0.1%	Trimmed	-474,185	15 May 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC	1,076,004	$5.7m	under 0.1%	Added	+623,562	15 May 2026 (the filing on sec.gov)
Millennium Management LLC	846,220	$4.5m	under 0.1%	Trimmed	-2,263,066	15 May 2026 (the filing on sec.gov)
Citadel Advisors LLC	721,410	$3.8m	under 0.1%	Added	+615,728	15 May 2026 (the filing on sec.gov)
Wellington Management Group LLP	360,125	$1.9m	under 0.1%	Added	+43,276	15 May 2026 (the filing on sec.gov)
AQR Capital Management LLC	200,428	$1.1m	under 0.1%	Added	+45,210	15 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP	157,025	$831k	under 0.1%	Added	+112,283	15 May 2026 (the filing on sec.gov)
Invesco Ltd	101,207	$535k	under 0.1%	Added	+37,306	12 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc	99,522	$527k	under 0.1%	Added	+29,034	15 May 2026 (the filing on sec.gov)
Tudor Investment Corp	88,931	$470k	under 0.1%	New	new	15 May 2026 (the filing on sec.gov)
AllianceBernstein LP	83,940	$451k	under 0.1%	Held	0	15 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.	65,967	$349k	under 0.1%	Added	+14,485	15 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd	55,600	$294k	under 0.1%	New	new	18 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC	50,202	$266k	under 0.1%	Trimmed	-75,990	15 May 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP	44,030	$233k	under 0.1%	New	new	14 May 2026 (the filing on sec.gov)
Two Sigma Investments LP	33,100	$175k	under 0.1%	New	new	15 May 2026 (the filing on sec.gov)
Neuberger Berman Group LLC	16,353	$87k	under 0.1%	Added	+3,546	27 Oct 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP	10,200	$54k	under 0.1%	Trimmed	-108,328	15 May 2026 (the filing on sec.gov)
Quantbot Technologies LP	720	$4k	under 0.1%	New	new	13 May 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

There is no earlier quarter on file to compare with.

Increases

Schonfeld Strategic Advisors LLCexisting position · 1,076,004 shares now+623,562
Citadel Advisors LLCexisting position · 721,410 shares now+615,728
Susquehanna International Group LLPexisting position · 157,025 shares now+112,283
Tudor Investment Corpnew position · 88,931 shares now+88,931
Janus Henderson Group Ltdnew position · 55,600 shares now+55,600

Reductions

Millennium Management LLCexisting position · 846,220 shares now-2,263,066
Fidelity (FMR LLC)existing position · 1,801,721 shares now-777,990
Balyasny Asset Management LLCexisting position · 1,119,090 shares now-474,185
Brevan Howard Capital Management LPexisting position · 10,200 shares now-108,328
Squarepoint Ops LLCexisting position · 50,202 shares now-75,990

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (5)

Exited (4)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.

1 in Q4 2021 to 1 in Q1 2026

Tracked managers listing it, at least.

the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

CMPX and GILD →CMPX and AMGN →CMPX and ARGX →Choose a stock to compare with CMPX →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own CMPX, latest filings →Back to the 13F Explorer →

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Quarter	Holders	Reported value	Buyers	Sellers
Q4 2021	1	$3.2m	n.a.	n.a.
Q1 2022	1	$798k	n.a.	n.a.
Q4 2022	1	$30m	n.a.	n.a.
Q4 2023	1	$458k	1	0
Q1 2026	1	$5.7m	14	9