Biogen Inc. 13F holders
1,049 funds reported a position in Biogen Inc. in their 13F for the quarter ended 30 June 2026, together 142.4 million shares worth $30.74 billion. Against the quarter before, 89 opened a position, 423 added, 296 trimmed and 82 sold out; together they bought a net 4.8 million shares. The largest holders: FMR LLC, BlackRock, Inc. and Primecap Management Co.
Funds holding1,049+31 on Q1 2026
Shares they held142.4Mworth $30.74 billion
Net bought on the quarter4.8M sharesabout $1.04 billion at the funds' values
Funds buying to selling512 to 378opened or added, to cut or sold
Opened 89Added 423Held 229Trimmed 296Sold out 82
What each fund did in BIIB against its 13F for the quarter before; a change under 0.1% of a holding counts as held
Funds reporting a position in BIIB in their 13F, each quarter; hover a bar for the shares they held
Filed so far for the quarter to 30 September 2026
4,696 funds have filed their 13F for the quarter so far; the rest are due by 16 November 2026. Of those, 533 reported a position in Biogen Inc.: 30 opened one, 195 added, 153 trimmed and 30 sold out, a net 358,968 shares bought.
The largest moves in the name among the funds that have filed, against each fund's previous 13F.
The well-known funds
Of the 44 funds followed here, 1 reported a position in Biogen Inc. in a 13F for the quarter ended 30 September 2026, and 7 more in a 13F for an earlier quarter, the latest each has filed. The largest: FMR LLC, 18.2 million shares worth $3.94 billion, 0.2% of its reported book (its 13F for the quarter ended 30 June 2026). Sold out: Millennium Management. In the quarter, 1 fund added or opened a position and 0 trimmed or sold out; together they bought a net 58,109 shares, about $13.1 million at the funds' own value per share on 30 September 2026. A change under 0.1% of a holding counts as held.
| Fund | Shares | Value | Of its book | Change on the quarter | Status | Quarter ended | Filing |
|---|---|---|---|---|---|---|---|
| FMR LLC | 18,217,239 | $3.94 billion | 0.2% | +5,409,698 | added | 30 June 2026, an earlier quarter | 13F |
| Geode Capital Management | 4,507,404 | $1.01 billion | 0.1% | +58,109 | added | 30 September 2026 | 13F |
| Norges Bank | 2,580,033 | $557.4 million | 0.1% | held | 30 June 2026, an earlier quarter | 13F | |
| Alyeska | 932,374 | $201.4 million | 0.5% | +127,324 | added | 30 June 2026, an earlier quarter | 13F |
| Citadel Advisors | 418,356 | $90.4 million | 0.1% | +280,263 | added | 30 June 2026, an earlier quarter | 13F |
| Point72 Asset Management | 88,149 | $19.0 million | 0.0% | -721,468 | trimmed | 30 June 2026, an earlier quarter | 13F |
| Renaissance Technologies | 77,744 | $16.8 million | 0.0% | -125,652 | trimmed | 30 June 2026, an earlier quarter | 13F |
| Two Sigma Investments | 7,105 | $1.5 million | 0.0% | -2,339 | trimmed | 30 June 2026, an earlier quarter | 13F |
| Millennium Management | 0 | $0 | 0.0% | -93,964 | exited | 30 June 2026, an earlier quarter | 13F |
Value is what the fund reported.
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Change is shares against the fund's previous 13F; a fund with one filing read shows no change. 13Fs cover long US positions of managers above $100 million and are filed up to 45 days after the quarter.The largest holders
| Fund | Shares | Share of all | Value | Of its book | Change in shares | Filing |
|---|---|---|---|---|---|---|
| FMR LLC | 18,217,239 | 12.79% | $3.94 billion | 0.17% | +5,409,698 | 13F |
| BlackRock, Inc. | 15,985,736 | 11.23% | $3.45 billion | 0.05% | +11,135 | 13F |
| Primecap Management Co. | 15,154,606 | 10.64% | $3.27 billion | 1.94% | +396,999 | 13F |
| Vanguard Capital Management LLC | 9,651,117 | 6.78% | $2.09 billion | 0.04% | +113,700 | 13F |
| State Street Corp. | 7,344,327 | 5.16% | $1.59 billion | 0.05% | +176,405 | 13F |
| Vanguard Portfolio Management LLC | 6,604,936 | 4.64% | $1.43 billion | 0.06% | +73,209 | 13F |
| Geode Capital Management, LLC | 4,449,295 | 3.12% | $957.9 million | 0.05% | +106,693 | 13F |
| Wellington Management Group LLP | 3,117,469 | 2.19% | $673.6 million | 0.12% | +155,828 | 13F |
| Norges Bank | 2,580,033 | 1.81% | $557.4 million | 0.06% | 13F | |
| Morgan Stanley | 2,411,271 | 1.69% | $521.0 million | 0.03% | +240,331 | 13F |
| AQR Capital Management LLC | 1,936,859 | 1.36% | $416.9 million | 0.14% | +13,302 | 13F |
| JPMorgan Chase & Co. | 1,823,140 | 1.28% | $394.9 million | 0.02% | -192,869 | 13F |
| Invesco Ltd. | 1,803,944 | 1.27% | $389.8 million | 0.03% | +58,689 | 13F |
| Amundi | 1,516,831 | 1.07% | $327.7 million | 0.08% | +726,004 | 13F |
| Legal & General Group Plc | 1,493,289 | 1.05% | $322.6 million | 0.07% | +143,457 | 13F |
| Northern Trust Corp. | 1,429,490 | 1.00% | $308.9 million | 0.04% | -17,089 | 13F |
| Boston Partners | 1,263,429 | 0.89% | $272.8 million | 0.24% | -436,649 | 13F |
| UBS AM, a distinct business unit of UBS Asset Management Americas LLC | 1,255,168 | 0.88% | $271.2 million | 0.05% | -122,400 | 13F |
| Goldman Sachs Group Inc. | 1,230,390 | 0.86% | $265.8 million | 0.03% | +179,296 | 13F |
| Dimensional Fund Advisors LP | 1,148,568 | 0.81% | $248.2 million | 0.04% | +69,449 | 13F |
| Pacer Advisors, Inc. | 1,122,981 | 0.79% | $242.6 million | 0.63% | +462,573 | 13F |
| Charles Schwab Investment Management Inc. | 1,117,663 | 0.78% | $241.5 million | 0.03% | -31,731 | 13F |
| Bank of America Corp. | 1,116,228 | 0.78% | $241.2 million | 0.02% | -40,141 | 13F |
| UBS Group AG | 1,030,150 | 0.72% | $222.6 million | 0.04% | +506,700 | 13F |
| Alyeska Investment Group, L.P. | 932,374 | 0.65% | $201.4 million | 0.52% | +127,324 | 13F |
| Deutsche Bank AG | 894,035 | 0.63% | $193.2 million | 0.06% | -169,793 | 13F |
| Pictet Asset Management Holding SA | 851,819 | 0.60% | $184.1 million | 0.18% | -61,509 | 13F |
| Vanguard Fiduciary Trust Co. | 829,318 | 0.58% | $179.2 million | 0.04% | +3,787 | 13F |
| Robeco Institutional Asset Management B.V. | 791,092 | 0.56% | $170.9 million | 0.21% | +27,918 | 13F |
| Fred Alger Management, LLC | 788,307 | 0.55% | $170.3 million | 0.57% | +55,113 | 13F |
| Price T Rowe Associates Inc. | 774,283 | 0.54% | $167.3 million | 0.02% | +101,856 | 13F |
| Bank of New York Mellon Corp | 773,619 | 0.54% | $167.1 million | 0.03% | -14,904 | 13F |
| Massachusetts Financial Services Co. | 744,892 | 0.52% | $163.1 million | 0.05% | +24,263 | 13F |
| Citigroup Inc. | 734,517 | 0.52% | $158.7 million | 0.07% | +234,010 | 13F |
| Royal Bank of Canada | 708,562 | 0.50% | $153.1 million | 0.03% | +177,185 | 13F |
| Employees Provident Fund Board | 704,196 | 0.49% | $152.1 million | 0.87% | no change | 13F |
| First Trust Advisors LP | 682,021 | 0.48% | $147.4 million | 0.09% | +8,063 | 13F |
| AustralianSuper Pty Ltd | 672,723 | 0.47% | $145.3 million | 0.63% | +56,530 | 13F |
| Artemis Investment Management LLP | 570,974 | 0.40% | $123.4 million | 1.10% | -597 | 13F |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 540,001 | 0.38% | $116.7 million | 0.22% | +17,846 | 13F |
| HSBC Holdings PLC | 527,866 | 0.37% | $114.0 million | 0.06% | +64,214 | 13F |
| Caisse de depot et placement du Quebec | 510,194 | 0.36% | $110.2 million | 0.16% | -8,500 | 13F |
| LSV Asset Management | 444,049 | 0.31% | $95.9 million | 0.17% | +110,310 | 13F |
| Citadel Advisors LLC | 418,356 | 0.29% | $90.4 million | 0.05% | +280,263 | 13F |
| Swiss National Bank | 413,900 | 0.29% | $89.4 million | 0.05% | -16,700 | 13F |
| National Pension Service | 406,064 | 0.29% | $87.7 million | 0.06% | +4,397 | 13F |
| BNP Paribas Financial Markets | 387,542 | 0.27% | $83.7 million | 0.04% | -83,526 | 13F |
| Candriam S.C.A. | 384,326 | 0.27% | $83.0 million | 0.38% | +2,558 | 13F |
| Mitsubishi UFJ Asset Management Co., Ltd. | 358,823 | 0.25% | $77.5 million | 0.04% | +24,410 | 13F |
| Sumitomo Mitsui Trust Group, Inc. | 346,617 | 0.24% | $74.9 million | 0.04% | -9,674 | 13F |
The 50 largest of the 1,049 funds that reported a position in BIIB in their 13F for the quarter ended 30 June 2026, by the value each reported.
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Share of all is the fund's part of all the shares the funds reported. Change is shares against the fund's 13F for the quarter before. A 13F lists a manager's long positions in US-listed shares at the quarter's end. What is a 13F?Options the funds reported on BIIB
| Fund | Option | Shares under the options | Value of those shares | Quarter ended | Filing |
|---|---|---|---|---|---|
| Citadel Advisors | Calls | 315,000 | $68.1 million | 30 June 2026 | 13F |
| Citadel Advisors | Puts | 134,200 | $29.0 million | 30 June 2026 | 13F |
| Millennium Management | Puts | 34,800 | $7.5 million | 30 June 2026 | 13F |
| Millennium Management | Calls | 14,700 | $3.2 million | 30 June 2026 | 13F |
| Point72 Asset Management | Calls | 300 | $64,818 | 30 June 2026 | 13F |
| Point72 Asset Management | Puts | 300 | $64,818 | 30 June 2026 | 13F |
A 13F lists calls and puts by the shares they cover and what those shares were worth at the quarter's end, not what the options cost.
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They are not counted in the holdings above. A put gains when the stock falls, a call when it rises, and a fund may hold either to hedge.Schedule 13D and 13G filed on the name, last twelve months
| Filed | Schedule | Who | Holding | Of the class | Event date | Rule or purpose | Filing |
|---|---|---|---|---|---|---|---|
| 6 August 2026 | 13G/A | FMR LLC and 3 others | 18.3 million | 12.4% | 30 June 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 5 June 2026 | 13G/A | FMR LLC and 3 others | 16.7 million | 11.3% | 29 May 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 6 May 2026 | 13G/A | FMR LLC and 3 others | 12.8 million | 8.7% | 31 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 29 April 2026 | 13G | Vanguard Capital Management and 1 other | 11.0 million | 7.5% | 31 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 26 March 2026 | 13G/A | The Vanguard Group and 1 other | 0 | 0.0% | 13 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 5 February 2026 | 13G | FMR LLC and 3 others | 9.4 million | 6.4% | 31 December 2025 | passive, institutional (13d-1(b)) | EDGAR |
| 13 November 2025 | 13G/A | Primecap Management Co and 1 other | 15.0 million | 10.2% | 30 September 2025 | passive, institutional (13d-1(b)) | EDGAR |
| 10 November 2025 | 13G | State Street Corporation and 1 other | 7.3 million | 5.0% | 30 September 2025 | passive, institutional (13d-1(b)) | EDGAR |
A Schedule 13D is filed by anyone who crosses 5% of a class with intent to influence; a 13G by a passive holder.
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Amendments (/A) report a change, including an exit to zero. Holding and percentage are as the filer stated them on the cover page; the purpose is the filer's own words, cut short. 13D and 13GFails to deliver
| Settlement date | Shares failed | Price | File |
|---|---|---|---|
| 28 August 2026 | 991 | $221.50 | SEC |
| 25 August 2026 | 3,091 | $218.12 | SEC |
| 24 August 2026 | 93 | $216.78 | SEC |
| 21 August 2026 | 145 | $214.35 | SEC |
| 7 August 2026 | 135 | $206.28 | SEC |
| 3 August 2026 | 2,347 | $202.95 | SEC |
| 17 July 2026 | 8 | $208.92 | SEC |
| 16 July 2026 | 63 | $197.24 | SEC |
Shares that failed to deliver at settlement, per day, from the SEC's half-month files, which arrive about two weeks after the period.