Biogen Inc.
MX ˙ BMV ˙ US09062X1037
SecurityMX:BIIB / Biogen Inc.
InstitutionAvestar Capital, LLC
Latest Disclosed Ownership3,604 shares
Latest Disclosed Value $ 660,760
Avestar Capital, LLC ownership in BIIB / Biogen Inc.

On May 13, 2026 - Avestar Capital, LLC filed a 13F-HR form disclosing ownership of 3,604 shares of Biogen Inc. (MX:BIIB) valued at $660,760 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 3,535 shares of Biogen Inc.. This represents a change in shares of 1.95% during the quarter.

Avestar Capital, LLC has a history of taking positions in derivatives of the underlying security (BIIB) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 0 of underlying shares valued at $0 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:BIIB / Biogen Inc. Historical Put/Call Ratio
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 3,604 69 1.95 661 6.11 0.0424
2026-02-10 2025-12-31 13F BIOGEN COM 09062X103 3,535 913 34.82 622 69.48 0.0403
2025-11-07 2025-09-30 13F BIOGEN COM 09062X103 2,622 -175 -6.26 367 4.56 0.0240
2025-08-13 2025-06-30 13F BIOGEN COM 09062X103 2,797 622 28.60 351 18.18 0.0240
2025-05-14 2025-03-31 13F BIOGEN COM 09062X103 2,175 -70 -3.12 298 -13.41 0.0258
2025-01-29 2024-12-31 13F BIOGEN COM 09062X103 2,245 58 2.65 343 -18.91 0.0292
2024-11-13 2024-09-30 13F BIOGEN COM 09062X103 2,187 -301 -12.10 424 -26.56 0.0436
2024-08-08 2024-06-30 13F BIOGEN COM 09062X103 2,488 454 22.32 577 31.51 0.0592
2024-05-10 2024-03-31 13F BIOGEN COM 09062X103 2,034 -103 -4.82 439 -20.65 0.0460
2024-02-12 2023-12-31 13F BIOGEN COM 09062X103 2,137 105 5.17 553 5.75 0.0627
2023-10-20 2023-09-30 13F BIOGEN COM 09062X103 2,032 24 1.20 522 -8.58 0.0743
2023-08-02 2023-06-30 13F BIOGEN COM 09062X103 2,008 134 7.15 572 9.60 0.0917
2023-04-20 2023-03-31 13F BIOGEN COM 09062X103 1,874 99 5.58 521 6.11 0.0930
2023-01-20 2022-12-31 13F BIOGEN COM 09062X103 1,775 14 0.80 492 4.47 0.0890
2022-10-26 2022-09-30 13F BIOGEN COM 09062X103 1,761 -314 -15.13 470 11.11 0.1198
2022-07-28 2022-06-30 13F BIOGEN COM 09062X103 2,075 -659 -24.10 423 -26.56 0.1041
2022-04-26 2022-03-31 13F BIOGEN COM 09062X103 2,734 133 5.11 576 -7.69 0.0919
2022-02-01 2021-12-31 13F BIOGEN COM 09062X103 2,601 703 37.04 624 16.20 0.0763
2021-11-09 2021-09-30 13F BIOGEN COM 09062X103 1,898 18 0.96 537 -17.51 0.0687
2021-08-03 2021-06-30 13F BIOGEN COM 09062X103 1,880 -116 -5.81 651 21.91 0.0873
2021-05-03 2021-03-31 13F BIOGEN COM 09062X103 1,996 144 7.78 534 17.88 0.1191
2021-02-01 2020-12-31 13F BIOGEN COM 09062X103 1,852 84 4.75 453 -0.22 0.1258
2020-10-29 2020-09-30 13F BIOGEN COM 09062X103 1,768 -143 -7.48 454 -11.15 0.1497
2020-07-29 2020-06-30 13F BIOGEN COM 09062X103 1,911 -259 -11.94 511 -25.62 0.2258
2020-05-12 2020-03-31 13F BIOGEN COM 09062X103 2,170 231 11.91 687 19.48 0.3753
2020-02-14 2019-12-31 13F BIOGEN COM 09062X103 1,939 -167 -7.93 575 17.35 0.3248
2019-11-15 2019-09-30 13F/A-1 BIOGEN INC COM USD0.0005 COM 09062X103 2,106 -5 -0.24 490 3.59 0.3046
2019-11-14 2019-09-30 13F BIOGEN INC COM USD0.0005 COM 09062X103 2,106 -5 490 0.3046
2019-08-06 2019-06-30 13F BIOGEN INC COM USD0.0005 COM 09062X103 2,111 -98 -4.44 473 -5.78 0.2997
2019-05-09 2019-03-31 13F BIOGEN INC COM USD0.0005 COM 09062X103 2,209 -120 -5.15 502 -25.63 0.3297
2019-01-25 2018-12-31 13F BIOGEN INC COM COM 09062X103 2,329 -150 -6.05 675 -20.77 0.4611
2018-10-23 2018-09-30 13F BIOGEN INC COM COM 09062X103 2,479 51 2.10 852 24.38 0.4926
2018-08-10 2018-06-30 13F BIOGEN INC COM COM 09062X103 2,428 287 13.40 685 21.67 0.4331
2018-05-10 2018-03-31 13F BIOGEN INC COM COM 09062X103 2,141 154 7.75 563 -8.90 0.3660
2018-02-14 2017-12-31 13F BIOGEN INC COM COM 09062X103 1,987 1,987 618 0.4618
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2022-04-26 2022-03-31 13F BIOGEN COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2022-02-01 2021-12-31 13F BIOGEN COM Call 2,000 -69.23 480 -73.90 n/a n/a n/a
2021-11-09 2021-09-30 13F BIOGEN COM Call 6,500 85.71 1,839 51.73 n/a n/a n/a
2021-08-03 2021-06-30 13F BIOGEN COM Call 3,500 1,212 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2022-07-28 2022-06-30 13F BIOGEN COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2022-04-26 2022-03-31 13F BIOGEN COM Put 1,000 -60.00 211 -64.83 n/a n/a n/a
2022-02-01 2021-12-31 13F BIOGEN COM Put 2,500 600 n/a n/a n/a
2021-11-09 2021-09-30 13F BIOGEN COM Put 0 -100.00 0 -100.00 n/a n/a n/a
2021-08-03 2021-06-30 13F BIOGEN COM Put 3,200 1,108 n/a n/a n/a
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.