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ANNX in the 13F filings

Annexon Inc · CUSIP 03589W102

Sector · Pharmaceuticals and biotechnologyTheme · Healthcare: biopharma and medtech· L3VLUP-definedTheme · Pharmaceutical preparations
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023Q2 2023Q1 2023
Quarter end
31 Mar 2026
the date the book describes
Filed
18 May 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
29
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 1 listed it in both
Shares listed
28,616,593
combined, among listed positions
Reported value
$158m
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: 15 buyers (opened or added shares) and 14 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -987,079.

Managers listing ANNX 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.

29 of 29 holders

ActionFiling
Fidelity (FMR LLC)10,635,648$59munder 0.1%Added+413,17815 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC3,886,909$22munder 0.1%Added+587,65315 May 2026 (the filing on sec.gov)
Woodline Partners LP2,337,137$13munder 0.1%Trimmed-1,662,93715 May 2026 (the filing on sec.gov)
Point72 Asset Management LP1,871,795$10munder 0.1%Added+1,500,60515 May 2026 (the filing on sec.gov)
Millennium Management LLC1,238,678$6.9munder 0.1%Trimmed-1,598,17915 May 2026 (the filing on sec.gov)
MFS Investment Management903,368$5.0munder 0.1%Trimmed-7114 May 2026 (the filing on sec.gov)
Marshall Wace LLP861,475$4.8munder 0.1%Added+340,47715 May 2026 (the filing on sec.gov)
AQR Capital Management LLC777,253$4.3munder 0.1%Added+94615 May 2026 (the filing on sec.gov)
Invesco Ltd763,005$4.2munder 0.1%Trimmed-209,44412 May 2026 (the filing on sec.gov)
Acadian Asset Management LLC758,232$4.2munder 0.1%Trimmed-103,01313 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.702,799$3.9munder 0.1%Trimmed-343,42215 May 2026 (the filing on sec.gov)
Citadel Advisors LLC600,135$3.3munder 0.1%Added+324,84115 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC544,300$3.0munder 0.1%Trimmed-258,30014 May 2026 (the filing on sec.gov)
Wellington Management Group LLP521,379$2.9munder 0.1%Added+123,30215 May 2026 (the filing on sec.gov)
Two Sigma Investments LP471,391$2.6munder 0.1%Added+139,35315 May 2026 (the filing on sec.gov)
Voloridge Investment Management LLC462,068$2.6munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc428,720$2.4munder 0.1%Trimmed-16,35415 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP158,640$879kunder 0.1%Trimmed-26,86815 May 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC123,282$683kunder 0.1%Trimmed-399,56415 May 2026 (the filing on sec.gov)
Man Group PLC109,222$605kunder 0.1%Newnew15 May 2026 (the filing on sec.gov)
AllianceBernstein LP119,050$598kunder 0.1%Trimmed-21,69015 May 2026 (the filing on sec.gov)
Polen Capital Management LLC70,152$389kunder 0.1%Newnew14 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC67,956$376kunder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd59,100$328kunder 0.1%Newnew18 May 2026 (the filing on sec.gov)
Brevan Howard Capital Management LP58,433$324kunder 0.1%Trimmed-65,32015 May 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

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

New (7)

Exited (0)

No exit shown by a manager’s own filing.

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.
3 in Q1 2024 to 2 in Q2 2026

Tracked managers listing it, at least.

012320212022202320242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
ANNX by quarter
QuarterHoldersReported valueBuyersSellers
Q3 20203$47mn.a.n.a.
Q4 20201$39mn.a.n.a.
Q1 20212$48mn.a.n.a.
Q2 20211$31mn.a.n.a.
Q3 20212$41mn.a.n.a.
Q4 20211$5.3mn.a.n.a.
Q1 20221$698kn.a.n.a.
Q2 20222$2.0mn.a.n.a.
Q3 20221$7.8mn.a.n.a.
Q1 20232$2.2mn.a.n.a.
Q2 20231$2.5mn.a.n.a.
Q3 20231$3.5mn.a.n.a.
Q4 20231$9.1m10
Q1 20243$58m30
Q2 20242$49m20
Q3 20243$57m12
Q4 20242$43m11
Q3 20251$8.0m10
Q4 20251$20m185
Q1 20262$13m1514
Q2 20262$42m1119

Compare with…

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

ANNX and LLY →ANNX and JNJ →ANNX and VRTX →Choose a stock to compare with ANNX →

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 ANNX, latest filings →Back to the 13F Explorer →