바이오젠(주)
MX ˙ BMV ˙ US09062X1037
SecurityMX:BIIB / Biogen Inc.
InstitutionDaiwa Securities Group Inc.
Latest Disclosed Ownership27,136 shares
Latest Disclosed Value $ 4,974,843
Daiwa Securities Group Inc. reports 3.27% increase in ownership of BIIB / Biogen Inc.

On May 13, 2026 - Daiwa Securities Group Inc. filed a 13F-HR form disclosing ownership of 27,136 shares of Biogen Inc. (MX:BIIB) valued at $4,974,843 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 26,277 shares of Biogen Inc.. This represents a change in shares of 3.27% during the quarter.

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)
2026-05-13 2026-03-31 13F BIOGEN COM 09062X103 27,136 859 3.27 4,975 124,250.00 0.0143
2026-02-10 2025-12-31 13F BIOGEN COM 09062X103 26,277 -17,798 -40.38 5 -33.33 0.0148
2025-11-14 2025-09-30 13F BIOGEN COM 09062X103 44,075 4,947 12.64 6 50.00 0.0208
2025-08-14 2025-06-30 13F BIOGEN COM 09062X103 39,128 -4,265 -9.83 5 -20.00 0.0181
2025-05-13 2025-03-31 13F BIOGEN COM 09062X103 43,393 6,172 16.58 6 0.00 0.0251
2025-02-07 2024-12-31 13F BIOGEN COM 09062X103 37,221 5,627 17.81 6 -16.67 0.0254
2024-11-12 2024-09-30 13F BIOGEN COM 09062X103 31,594 6,746 27.15 6 20.00 0.0283
2024-08-07 2024-06-30 13F BIOGEN COM 09062X103 24,848 2,197 9.70 6 25.00 0.0306
2024-05-02 2024-03-31 13F BIOGEN COM 09062X103 22,651 2,172 10.61 5 -20.00 0.0276
2024-01-31 2023-12-31 13F BIOGEN COM 09062X103 20,479 -30,149 -59.55 5 -16.67 0.0330
2023-11-01 2023-09-30 13F BIOGEN COM 09062X103 50,628 31,991 171.65 7 20.00 0.0489
2023-07-31 2023-06-30 13F BIOGEN COM 09062X103 18,637 508 2.80 5 0.00 0.0351
2023-05-02 2023-03-31 13F BIOGEN COM 09062X103 18,129 1,859 11.43 5 25.00 0.0350
2023-02-06 2022-12-31 13F BIOGEN COM 09062X103 16,270 416 2.62 5 -99.91 0.0346
2022-11-02 2022-09-30 13F BIOGEN COM 09062X103 15,854 747 4.94 4,233 23.05 0.0352
2022-08-09 2022-06-30 13F BIOGEN COM 09062X103 15,107 -100,085 -86.89 3,440 0.61 0.0263
2022-04-29 2022-03-31 13F BIOGEN COM 09062X103 115,192 61,304 113.76 3,419 -1.78 0.0158
2022-02-03 2021-12-31 13F BIOGEN COM 09062X103 53,888 40,961 316.86 3,481 -4.84 0.0205
2021-11-05 2021-09-30 13F BIOGEN COM 09062X103 12,927 683 5.58 3,658 -13.73 0.0240
2021-08-06 2021-06-30 13F BIOGEN COM 09062X103 12,244 -4,667 -27.60 4,240 -10.38 0.0286
2021-05-03 2021-03-31 13F BIOGEN COM 09062X103 16,911 5,058 42.67 4,731 63.03 0.0352
2021-02-04 2020-12-31 13F BIOGEN COM 09062X103 11,853 27 0.23 2,902 -13.50 0.0224
2020-11-02 2020-09-30 13F BIOGEN COM 09062X103 11,826 -10,552 -47.15 3,355 -11.01 0.0304
2020-08-11 2020-06-30 13F BIOGEN COM 09062X103 22,378 11,189 100.00 3,770 6.50 0.0795
2020-05-14 2020-03-31 13F BIOGEN COM 09062X103 11,189 1,391 14.20 3,540 21.78 0.0367
2020-01-31 2019-12-31 13F BIOGEN COM 09062X103 9,798 -140 -1.41 2,907 25.63 0.0240
2019-11-04 2019-09-30 13F BIOGEN COM 09062X103 9,938 1,368 15.96 2,314 15.47 0.0196
2019-07-24 2019-06-30 13F BIOGEN COM 09062X103 8,570 -1,287 -13.06 2,004 -13.99 0.0177
2019-04-26 2019-03-31 13F BIOGEN COM 09062X103 9,857 -2,256 -18.62 2,330 -36.08 0.0204
2019-02-05 2018-12-31 13F BIOGEN COM 09062X103 12,113 -5,712 -32.04 3,645 -42.12 0.0350
2018-11-01 2018-09-30 13F BIOGEN COM 09062X103 17,825 7,970 80.87 6,297 120.10 0.0527
2018-07-30 2018-06-30 13F BIOGEN COM 09062X103 9,855 280 2.92 2,861 9.12 0.0225
2018-05-02 2018-03-31 13F BIOGEN COM 09062X103 9,575 1,625 20.44 2,622 3.55 0.0210
2018-02-06 2017-12-31 13F BIOGEN COM 09062X103 7,950 144 1.84 2,532 3.56 0.0179
2017-11-02 2017-09-30 13F BIOGEN COM 09062X103 7,806 1,576 25.30 2,445 44.59 0.0167
2017-07-28 2017-06-30 13F BIOGEN COM 09062X103 6,230 -19,480 -75.77 1,691 -75.95 0.0109
2017-05-02 2017-03-31 13F BIOGEN COM 09062X103 25,710 171 0.67 7,030 -2.93 0.0442
2017-02-01 2016-12-31 13F BIOGEN COM 09062X103 25,539 8,239 47.62 7,242 33.74 0.0465
2017-01-10 2016-09-30 13F/A-1 BIOGEN COM 09062X103 17,300 50 0.29 5,415 29.82 0.0323
2016-11-04 2016-09-30 13F BIOGEN COM 09062X103 17,300 5,415
2016-07-25 2016-06-30 13F BIOGEN COM 09062X103 17,250 5,400 45.57 4,171 35.20 0.0249
2016-05-12 2016-03-31 13F BIOGEN COM 09062X103 11,850 6,470 120.26 3,085 87.20 0.0195
2016-02-04 2015-12-31 13F BIOGEN COM 09062X103 5,380 -22,500 -80.70 1,648 -79.74 0.0109
2015-11-10 2015-09-30 13F BIOGEN COM 09062X103 27,880 -9,770 -25.95 8,136 -46.50 0.0579
2015-08-05 2015-06-30 13F BIOGEN COM 09062X103 37,650 19,100 102.96 15,208 94.15 0.1081
2015-05-12 2015-03-31 13F BIOGEN COM 09062X103 18,550 3,850 26.19 7,833 56.97 0.0524
2015-02-13 2014-12-31 13F BIOGEN IDEC COM 09062X103 14,700 8,570 139.80 4,990 146.06 0.0352
2014-11-12 2014-09-30 13F BIOGEN IDEC COM 09062X103 6,130 -100 -1.61 2,028 3.26 0.0154
2014-08-13 2014-06-30 13F/A-1 BIOGEN IDEC COM 09062X103 6,230 -300 1,964 0.0146
2014-08-13 2014-06-30 13F/A-2 BIOGEN IDEC COM 09062X103 6,230 -300 -4.59 1,964 -1.65 0.0423
2014-08-13 2014-06-30 13F BIOGEN IDEC COM 09062X103 6,230 1,964
2014-05-14 2014-03-31 13F/A-1 BIOGEN IDEC COM 09062X103 6,530 0 1,997 0.0156
2014-05-15 2014-03-31 13F/A-2 BIOGEN IDEC COM 09062X103 6,530 0 0.00 1,997 9.36 0.0156
2014-05-13 2014-03-31 13F BIOGEN IDEC COM 09062X103 6,530 1,997
2014-02-13 2013-12-31 13F BIOGEN IDEC COM 09062X103 6,530 -600 -8.42 1,826 6.35 0.0155
2013-11-14 2013-09-30 13F BIOGEN IDEC COM 09062X103 7,130 0 0.00 1,717 11.93 0.0137
2013-08-16 2013-06-30 13F/A-1 BIOGEN IDEC COM 09062X103 7,130 7,130 1,534 0.0116
2013-08-13 2013-06-30 13F BIOGEN IDEC COM 09062X103 7,130 1,534
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.