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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
30 Jun 2026
the date the book describes
Filed
2 Sep 2026
latest of these filings; the earliest 3 Aug 2026
Managers listing it
27
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q1 2026 and Q2 2026; 1 listed it in both
Shares listed
39,552,037
combined, among listed positions
Reported value
$226m
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: 11 buyers (opened or added shares) and 19 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +10,935,444.

Managers listing ANNX in Q2 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q1 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

27 of 27 holders

ActionFiling
Fidelity (FMR LLC)19,518,496$111munder 0.1%Added+8,882,84813 Aug 2026 (the filing on sec.gov)
Woodline Partners LP6,925,067$40m0.12%Added+4,587,93014 Aug 2026 (the filing on sec.gov)
Balyasny Asset Management LLC2,830,976$16munder 0.1%Trimmed-1,055,93314 Aug 2026 (the filing on sec.gov)
Point72 Asset Management LP1,382,699$7.9munder 0.1%Trimmed-489,09614 Aug 2026 (the filing on sec.gov)
Millennium Management LLC1,184,931$6.8munder 0.1%Trimmed-53,74714 Aug 2026 (the filing on sec.gov)
MFS Investment Management1,037,366$5.9munder 0.1%Added+133,9983 Aug 2026 (the filing on sec.gov)
Arrowstreet Capital LP737,935$4.2munder 0.1%Newnew13 Aug 2026 (the filing on sec.gov)
AQR Capital Management LLC691,812$4.0munder 0.1%Trimmed-85,44114 Aug 2026 (the filing on sec.gov)
Acadian Asset Management LLC629,127$3.6munder 0.1%Trimmed-129,10513 Aug 2026 (the filing on sec.gov)
Citadel Advisors LLC596,582$3.4munder 0.1%Trimmed-3,5532 Sep 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC533,567$3.0munder 0.1%Added+410,28514 Aug 2026 (the filing on sec.gov)
Two Sigma Investments LP512,796$2.9munder 0.1%Added+41,40514 Aug 2026 (the filing on sec.gov)
Renaissance Technologies LLC459,000$2.6munder 0.1%Trimmed-85,30013 Aug 2026 (the filing on sec.gov)
Moore Capital Management LP425,332$2.4munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Wellington Management Group LLP406,795$2.3munder 0.1%Trimmed-114,58414 Aug 2026 (the filing on sec.gov)
Invesco Ltd330,729$1.9munder 0.1%Trimmed-432,27614 Aug 2026 (the filing on sec.gov)
D. E. Shaw & Co.265,284$1.5munder 0.1%Trimmed-437,51514 Aug 2026 (the filing on sec.gov)
Voloridge Investment Management LLC250,025$1.4munder 0.1%Trimmed-212,04314 Aug 2026 (the filing on sec.gov)
Marshall Wace LLP210,607$1.2munder 0.1%Trimmed-650,86813 Aug 2026 (the filing on sec.gov)
Squarepoint Ops LLC173,285$989kunder 0.1%Added+105,32914 Aug 2026 (the filing on sec.gov)
AllianceBernstein LP147,240$816kunder 0.1%Added+28,19014 Aug 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc129,243$738kunder 0.1%Trimmed-299,47714 Aug 2026 (the filing on sec.gov)
Janus Henderson Group Ltd59,100$338kunder 0.1%Held014 Aug 2026 (the filing on sec.gov)
Winton Group Ltd47,800$273kunder 0.1%Added+23,7007 Aug 2026 (the filing on sec.gov)
Susquehanna International Group LLP39,394$225kunder 0.1%Trimmed-119,24614 Aug 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q1 2026 to Q2 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 (2)

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.
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 →