주식회사 아넥슨
US ˙ NasdaqGS ˙ US03589W1027

SecurityANNX / Annexon, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership6,919,255 shares
Latest Disclosed Value $ 38,332,673
State Street Corp reports 48.73% increase in ownership of ANNX / Annexon, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 6,919,255 shares of Annexon, Inc. (US:ANNX) valued at $38,332,673 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 4,652,185 shares of Annexon, Inc.. This represents a change in shares of 48.73% during the quarter. The current value of the position is $36,602,859 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F ANNEXON COM 03589W102 6,919,255 2,267,070 48.73 38,333 64.14 0.0013
2026-02-13 2025-12-31 13F ANNEXON COM 03589W102 4,652,185 2,601,877 126.90 23,354 273.47 0.0008
2025-11-14 2025-09-30 13F ANNEXON COM 03589W102 2,050,308 69,324 3.50 6,253 31.53 0.0002
2025-08-14 2025-06-30 13F ANNEXON COM 03589W102 1,980,984 -58,842 -2.88 4,754 20.78 0.0002
2025-05-15 2025-03-31 13F ANNEXON COM 03589W102 2,039,826 -2,470,888 -54.78 3,937 -82.99 0.0002
2025-02-14 2024-12-31 13F ANNEXON COM 03589W102 4,510,714 668,835 17.41 23,140 1.74 0.0009
2024-11-14 2024-09-30 13F ANNEXON COM 03589W102 3,841,879 2,068,294 116.62 22,744 161.71 0.0009
2024-08-14 2024-06-30 13F ANNEXON COM 03589W102 1,773,585 575,462 48.03 8,691 1.16 0.0004
2024-05-15 2024-03-31 13F ANNEXON COM 03589W102 1,198,123 351,849 41.58 8,591 123.58 0.0004
2024-02-14 2023-12-31 13F ANNEXON COM 03589W102 846,274 14,730 1.77 3,842 95.82 0.0002
2023-11-14 2023-09-30 13F ANNEXON COM 03589W102 831,544 37,300 4.70 1,962 -29.80 0.0001
2023-08-14 2023-06-30 13F ANNEXON COM 03589W102 794,244 638,445 409.79 2,796 366.61 0.0001
2023-05-15 2023-03-31 13F ANNEXON COM 03589W102 155,799 32,300 26.15 600 -6.11 0.0000
2023-05-15 2022-12-31 13F/A-99 ANNEXON COM 03589W102 123,499 28,860 30.49 638 9.06 0.0000
2023-05-15 2022-12-31 13F ANNEXON COM 03589W102 123,499 28,860 638 0.0000
2022-11-15 2022-09-30 13F ANNEXON COM 03589W102 94,639 5,800 6.53 585 74.63 0.0000
2022-08-15 2022-06-30 13F ANNEXON COM 03589W102 88,839 -467,305 -84.03 335 -77.93 0.0000
2022-05-16 2022-03-31 13F ANNEXON COM 03589W102 556,144 -738,038 -57.03 1,518 -89.79 0.0001
2022-02-14 2021-12-31 13F ANNEXON COM 03589W102 1,294,182 789,539 156.45 14,870 58.34 0.0007
2021-11-15 2021-09-30 13F ANNEXON COM 03589W102 504,643 -432,027 -46.12 9,391 -55.46 0.0005
2021-08-16 2021-06-30 13F ANNEXON COM 03589W102 936,670 178,578 23.56 21,084 -0.10 0.0011
2021-07-09 2021-03-31 13F/A-1 ANNEXON COM 03589W102 758,092 499,198 192.82 21,105 225.69 0.0012
2021-05-17 2021-03-31 13F ANNEXON COM 03589W102 758,092 499,198 21,105 0.0012
2021-02-16 2020-12-31 13F ANNEXON COM 03589W102 258,894 77,116 42.42 6,480 17.93 0.0004
2020-11-10 2020-09-30 13F ANNEXON COM 03589W102 181,778 181,778 5,495 0.0004
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.