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ANNX · Annexon, Inc.

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$4.97 -0.28 (-5.33%) At close · Aug 28
Market Cap
$1.02B
Shares
204.44M

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: 217
Total Value: $1,026,648,101
Total Shares: 179,798,292
Showing 1–100 of 226 holdings by value · page 1 of 3

Institutional Ownership Trend

24 quarters

Holder Concentration

Across 217 13F filers · Δ vs Mar 31, 2026
Top Holder
10.9%
Sep 2023 → Jun 2026 · range 7.4% – 15.8%
+1.6 pts
Top 5
35.3%
Sep 2023 → Jun 2026 · range 33.0% – 46.7%
+2.3 pts
Top 10
51.9%
Sep 2023 → Jun 2026 · range 49.1% – 70.2%
+2.8 pts
HHI
385
Sep 2023 → Jun 2026 · range 351 – 607
Broadly held+34

Quarterly Activity

vs Mar 31, 2026
New
31
Increased
83
Decreased
77
Sold Out
31
Unchanged
26
Holder count: 0
Institutional value: +18.0%
Shares held: +14.5%

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 226
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1528115 CUSIP 03589W102 13F (30d) 188 filings 187 filers Visit website Investor relations