Latest Period
Q1 2026
Security Snapshot
Annexon, Inc. - Common Stock, par value $0.001 per share (ANNX) Institutional Ownership
CUSIP: 03589W102
13F Institutional Holders and Ownership History from Q3 2020 to Q1 2026
Institutions Reporting
217
Shares (Excl. Options)
155,947,902
Price
$5.54
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- Security type / class
- Equity / Common Stock, par value $0.001 per share
- Symbol
- ANNX on Nasdaq
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 155,947,902
- Total 13F value
- $863,678,650
- Portfolio coverage rank
- 0%
- Share change
- +18,101,698
- Value change
- +$101,291,739
- Number of holders
- 217
- Shares outstanding
- 161,077,278
- SEC-reported price per share
- $5.44
- Insider filing price
- $5.44
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- ANNX - Annexon, Inc. - Common Stock, par value $0.001 per share is tracked under CUSIP 03589W102.
- 217 institutions reported positions in Q1 2026.
- 7 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 169 to 217 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $687,297,160 to $863,678,650.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 217 institutions filings for Q1 2026.
Security key
03589W102
Latest holder period
Q1 2026
13F holders
217
13D/G owners
7
CIK / CUSIP context first
Open Q1 2026 holders
ANNX full holder history
Annexon, Inc. SEC filings
Annexon, Inc. company facts
Annexon, Inc. insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 03589W102:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
7
Security
ANNX
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Redmile Group, LLC | 9.9% | $85,778,935 | 15,427,866 | Redmile Group, LLC | 31 Dec 2025 | |||
| Satter Muneer A | 7.2% | $36,032,262 | 10,444,134 | Satter Muneer A | 19 Nov 2025 | |||
| FMR LLC | 7.1% | -30% | $51,316,801 | -$4,310,639 | 10,222,470 | -7.7% | FMR LLC | 31 Dec 2025 |
| BlackRock, Inc. | 6.1% | $44,521,150 | 8,868,755 | BlackRock, Inc. | 31 Dec 2025 | |||
| BIOTECHNOLOGY VALUE FUND L P | 5.4% | $48,187,878 | 8,698,173 | BVF PARTNERS L P/IL | 31 Mar 2026 | |||
| Bain Capital Life Sciences Fund, L.P. | 4.9% | $9,973,231 | 5,249,069 | BCLS I Investco, LP | 31 Dec 2024 | |||
| Point72 Asset Management, L.P. | 0.1% | $181,317 | 95,430 | Point72 Asset Management, L.P. | 31 Mar 2025 |
As of 31 Mar 2026, 217 institutional investors reported holding 155,947,902 shares of Annexon, Inc. - Common Stock, par value $0.001 per share (ANNX). This represents 97% of the company’s total 161,077,278 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
76%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| Redmile Group, LLC | 9% | 14,549,768 | +45% | 5.3% | $80,605,715 |
| BlackRock, Inc. | 6.8% | 10,938,509 | +22% | 0% | $60,599,340 |
| FMR LLC | 6.6% | 10,635,648 | +4% | 0% | $58,921,492 |
| BVF INC/IL | 5.4% | 8,698,173 | -4.7% | 1.5% | $48,187,878 |
| STATE STREET CORP | 4.3% | 6,919,255 | +49% | 0% | $38,332,673 |
| VANGUARD CAPITAL MANAGEMENT LLC | 3.7% | 5,956,589 | 0% | 0% | $32,999,503 |
| Bain Capital Life Sciences Investors, LLC | 3.2% | 5,212,674 | -0.69% | 2.6% | $28,878,214 |
| Bellevue Group AG | 3.2% | 5,157,290 | 0% | 0.68% | $28,571,387 |
| MAK CAPITAL ONE LLC | 2.9% | 4,724,043 | +60% | 4.3% | $26,171,198 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | 2.7% | 4,300,000 | -22% | 0.04% | $23,822,000 |
| BANK OF AMERICA CORP /DE/ | 2.6% | 4,259,995 | +165% | 0% | $23,600,372 |
| Nuveen, LLC | 2.6% | 4,246,330 | +46% | 0.01% | $23,524,668 |
| Siren, L.L.C. | 2.5% | 3,958,646 | 0.61% | $21,930,899 | |
| Balyasny Asset Management L.P. | 2.4% | 3,886,909 | +18% | 0.04% | $21,533,476 |
| AMERIPRISE FINANCIAL INC | 2.1% | 3,449,121 | -21% | 0% | $19,108,132 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.1% | 3,377,823 | +16% | 0% | $18,717,903 |
| Qube Research & Technologies Ltd | 1.9% | 3,114,314 | +31% | 0.02% | $17,253,300 |
| Palo Alto Investors LP | 1.8% | 2,948,090 | +24% | 2.5% | $16,332,419 |
| MORGAN STANLEY | 1.7% | 2,735,970 | -4.2% | 0% | $15,157,274 |
| GREAT POINT PARTNERS LLC | 1.6% | 2,500,000 | 3.4% | $13,850,000 | |
| Woodline Partners LP | 1.5% | 2,337,137 | -42% | 0.05% | $12,947,739 |
| Opaleye Management Inc. | 1.4% | 2,331,761 | -10% | 1.8% | $12,917,956 |
| GOLDMAN SACHS GROUP INC | 1.3% | 2,152,880 | +22% | 0% | $11,926,955 |
| Point72 Asset Management, L.P. | 1.2% | 1,871,795 | +404% | 0.02% | $10,369,744 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 0.92% | 1,483,090 | 0% | 0% | $8,216,319 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
23
Latest
Q1 2026
Rows shown
1-23 of 23
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 155,947,902 | $863,678,650 | +$101,291,739 | $5.54 | 217 |
| 2025 Q4 | 136,923,781 | $687,297,160 | +$183,807,666 | $5.02 | 169 |
| 2025 Q3 | 101,380,733 | $309,219,194 | +$11,142,271 | $3.05 | 143 |
| 2025 Q2 | 99,449,067 | $238,679,312 | +$759,672 | $2.40 | 127 |
| 2025 Q1 | 99,491,910 | $192,036,870 | -$14,234,585 | $1.93 | 146 |
| 2024 Q4 | 111,907,572 | $574,088,227 | +$7,286,342 | $5.13 | 151 |
| 2024 Q3 | 109,990,075 | $651,286,147 | +$12,076,588 | $5.92 | 141 |
| 2024 Q2 | 107,381,777 | $526,166,969 | +$50,550,360 | $4.90 | 139 |
| 2024 Q1 | 94,762,361 | $679,439,424 | +$107,931,991 | $7.17 | 125 |
| 2023 Q4 | 80,514,496 | $365,538,892 | +$125,501,716 | $4.54 | 98 |
| 2023 Q3 | 53,312,574 | $125,814,682 | -$910,472 | $2.36 | 91 |
| 2023 Q2 | 53,372,682 | $187,869,879 | -$1,833,578 | $3.52 | 93 |
| 2023 Q1 | 53,953,057 | $207,583,535 | +$11,598,782 | $3.85 | 98 |
| 2022 Q4 | 47,049,561 | $243,269,266 | +$3,854,655 | $5.17 | 81 |
| 2022 Q3 | 46,270,615 | $285,949,000 | +$49,950,788 | $6.18 | 69 |
| 2022 Q2 | 38,409,280 | $144,864,000 | +$5,360,704 | $3.77 | 74 |
| 2022 Q1 | 38,555,259 | $105,261,060 | -$23,763,559 | $2.73 | 96 |
| 2021 Q4 | 38,766,276 | $445,683,894 | +$6,730,750 | $11.49 | 94 |
| 2021 Q3 | 38,055,922 | $708,635,015 | -$28,821,254 | $18.61 | 81 |
| 2021 Q2 | 38,854,536 | $873,668,672 | +$29,687,677 | $22.51 | 73 |
| 2021 Q1 | 37,426,974 | $1,040,768,344 | +$38,809,119 | $27.84 | 72 |
| 2020 Q4 | 36,208,873 | $904,277,496 | -$17,927,945 | $25.03 | 70 |
| 2020 Q3 | 34,842,574 | $1,039,585,431 | +$1,039,585,431 | $30.23 | 65 |