AI summary pending
View Full Filing (SEC EDGAR)Annexon Inc
$4.93+0.8%
+$172.7M
Net Activity
+15.40% total shares
Institutions Holding
217
Popularity Rank
#2794
Avg Weight
0.14%
Total Value
$1.2B
Market Cap
$764.7M
217 institutions currently hold ANNX, with 115 net buyers and 102 net sellers this quarter.
Institutional Moves (Q2 2026)
Neutral
Based on recent trading activity
Net Selling Institutions
102
Net Buying Institutions
115
Top 5 by Value
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Across its top 20 institutional holders, ANNX's holder base skews toward low-concentration, low-turnover investors on average (avg. concentration score 14/100, avg. turnover score 44/100).
ANNX ranks #2794 out of 37501 tracked stocks by institutional interest — one of the most closely watched names in our coverage.
217 institutions disclose a position in ANNX, but none treat it as a major bet — even Mak Capital One LLC, its most concentrated holder, allocates just 4.7% of its own portfolio to it.
California State Teachers Retirement System has added to its ANNX position for two straight quarters, increasing it by $134.2M to reach $134.3M today.
Adage Capital Partners Gp, L.l.c. has trimmed its ANNX position for two straight quarters, cutting it by $7.6M while still holding $20.0M.
ANNX is up 0.8% today, and institutions have been net buyers of $172.7M this quarter — today's price move and the underlying institutional flow are pointing the same direction.
ANNX reported a net loss of $206.7M in its latest fiscal year.
+$388.7M
Total Buy Value
$112.1M
Total Sell Value
115
Net Buyers
102
Net Sellers
ANNX
Q2 2026
Top 5 Institutional Movers
+$52.5M
+$26.6M
+$21.3M
+$20.2M
ANNX does not currently have enough recent insider (Form 4) trading activity to compute a convergence signal against its 13F institutional flows.
13F data as of 2026-06-30 quarterly filings. Note: many large institutions file close to the 45-day post-quarter deadline, so early-quarter flow figures can shift substantially as more filings arrive.
3
Filings (90d)
$29K
Total Est. Value
5K shares
Planned Shares
| Filer | Filing Date | Est. Value |
|---|---|---|
| WIGGANS THOMAS G | 2026-08-13 | $11K |
| WIGGANS THOMAS G | 2026-07-15 | $13K |
| WIGGANS THOMAS G | 2026-07-14 | $6K |
Form 144 is a planned sale notice, not an executed transaction. Form 144 Tracker。
3
Active 5%+ Holders
| Reporting Person | Type | Filing Date | % of Class |
|---|---|---|---|
| BlackRock, Inc. | 13G/A | 2026-07-27 | 8.0% |
| FMR LLC | 13G/A | 2026-07-08 | 11.9% |
| Redmile Group, LLC | 13G/A | 2026-07-08 | 9.9% |
4
Filings (14d)
AI summary pending
View Full Filing (SEC EDGAR)Annexon (ticker: ANNX) said in its August 10, 2026 8-K that director Muneer Satter resigned from the board, the audit committee, and as chair of the nominating and corporate governance committee, effective just before Mark S. Blumenkranz, M.D., was appointed as his replacement; the company noted the resignation was not due to any disagreement with the company. Blumenkranz was appointed as a Class II director with a term running until the 2028 annual meeting, and will serve on the audit and science & technology committees. As a non-employee director, he receives a $40,000 annual retainer, an initial stock option for 175,000 shares, and an automatic 65,000-share option grant at each annual stockholder meeting. The filing also lists Items 7.01 and 9.01, but the excerpt provided does not include those details.
View Full Filing (SEC EDGAR)No AI summary for this filing type
View Full Filing (SEC EDGAR)Annexon entered into a loan and security agreement with Oxford Finance on July 30, 2026, for up to $200 million in term loans. The first $50 million was funded immediately; up to $100 million more is available if the company hits certain milestones, and an additional $50 million is available only if both sides agree. The money is for working capital and general corporate use. The loans carry a floating interest rate equal to the greater of 1-Month CME Term SOFR plus 4.6% or 7.60%, with maturity in 2031 or 2032 depending on milestones. Annexon pledged substantially all of its assets as collateral.
View Full Filing (SEC EDGAR)03589W102
The most-added stocks by 13F institutions this quarter
Institutions Holding
6,242
Total reported value
$2.2T
3229 13F institutions increased their position this quarter
Institutions Holding
5,990
Total reported value
$3.6T
3033 13F institutions increased their position this quarter
Institutions Holding
6,153
Total reported value
$1.8T
2971 13F institutions increased their position this quarter
The most widely held stocks tracked across all 13F institutions
Institutions Holding
6,141
Total reported value
$2.9T
Held by 6141 institutions — one of the most-tracked stocks on AlphaSMO
Institutions Holding
5,806
Total reported value
$1.8T
Held by 5806 institutions — one of the most-tracked stocks on AlphaSMO
Institutions Holding
5,251
Total reported value
$1.3T
Held by 5251 institutions — one of the most-tracked stocks on AlphaSMO
Access ANNX's institutional ownership data programmatically:
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