# BIOGEN INC (BIIB) — Institutional Ownership

Source: SEC EDGAR 13F filings, congressional STOCK Act disclosures, SEC Form 4 insider transactions.
CUSIP: 09062X103
Page URL: https://superinvestorclub.com/stock/BIIB
Last updated: 2026-08-29T13:46:02.507Z

## Summary

As of the most recent 13F filing period, BIOGEN INC (BIIB) is held by 3 tracked superinvestors with an aggregate position value of $126.6M representing 028369727828323993 shares.

## Top institutional holders (3)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|
| 1 | [Samantha McLemore](https://superinvestorclub.com/manager/294) | Patient Capital Management | 283697 | $61.3M | 2.01% | 2026-06-30 |
| 2 | [Sarah Ketterer](https://superinvestorclub.com/manager/293) | Causeway Capital Management | 278283 | $60.1M | 0.65% | 2026-06-30 |
| 3 | [Hillman Value Fund](https://superinvestorclub.com/manager/95) | Hillman Capital Management | 23993 | $5.2M | 3.75% | 2026-06-30 |

## Ownership history (quarter-over-quarter)

- 2023-12-31: 1 holders, $414,032 aggregate, 01600 shares
- 2024-03-31: 1 holders, $9.7M aggregate, 044952 shares
- 2024-06-30: 1 holders, $3.8M aggregate, 016416 shares
- 2024-09-30: 1 holders, $14.0M aggregate, 072104 shares
- 2024-12-31: 1 holders, $10.7M aggregate, 070033 shares
- 2025-03-31: 3 holders, $127.7M aggregate, 045560543351744025 shares
- 2025-06-30: 3 holders, $107.5M aggregate, 049335532046641972 shares
- 2025-09-30: 4 holders, $146.0M aggregate, 05675183966493998338354 shares
- 2025-12-31: 3 holders, $198.5M aggregate, 057635252110130516 shares
- 2026-03-31: 3 holders, $126.5M aggregate, 037974128078329540 shares
- 2026-06-30: 3 holders, $126.6M aggregate, 028369727828323993 shares

## Recent congressional trades (18)

- 2026-06-05: Gilbert Cisneros (D-CA) purchase $1,001 - $15,000
- 2026-06-02: Maria Elvira Salazar (Republican-FL) sale $15,001 - $50,000
- 2026-05-12: Maria Elvira Salazar (Republican-FL) purchase $1,001 - $15,000
- 2026-05-11: Maria Elvira Salazar (Republican-FL) purchase $1,001 - $15,000
- 2026-05-11: Maria Elvira Salazar (Republican-FL) purchase $50,001 - $100,000
- 2026-01-30: Gilbert Cisneros (D-CA) purchase $1,001 - $15,000
- 2026-01-30: Gil Cisneros (Democrat-CA) purchase $1,001 - $15,000
- 2025-08-26: Ro Khanna (Democrat-CA) purchase $1,001 - $15,000
- 2025-05-19: Ro Khanna (Democrat-CA) sale $1,001 - $15,000
- 2025-05-15: Rob Bresnahan (Republican-PA) purchase $1,001 - $15,000
- 2025-04-23: Ro Khanna (Democrat-CA) purchase $1,001 - $15,000
- 2025-04-08: Rob Bresnahan (Republican-PA) sale $1,001 - $15,000
- 2025-02-25: Rob Bresnahan (Republican-PA) purchase $1,001 - $15,000
- 2025-02-25: Ro Khanna (Democrat-CA) purchase $1,001 - $15,000
- 2025-02-19: Ro Khanna (Democrat-CA) sale $1,001 - $15,000

## Recent insider transactions (0)


## Citation

When citing, use: "BIOGEN INC (BIIB) institutional ownership data via Superinvestor (https://superinvestorclub.com/stock/BIIB), aggregating SEC 13F, Form 4, and congressional disclosures."