MarketPeel
Insider Trading Intelligence
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MF

Maria C. Freire

BIIB
DIRECTOR · BIOGEN INC. · CIK 0001547999
FILING MIX · LIFETIME71%/29%
BUYS
25
SELLS
10
TOTAL VALUE
$4.95M
COMPANIES
3
ACTIVE SINCE
Jan 2020
HOLDINGS NOW
128,952
AVG SELL PX
$42.14
TRADE KIND
SHOWING 35 / 35
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
7 backtested trades · 8 horizons · 7 pending
Forward-return performance of every backtestable P/S trade by Maria C. Freire, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d7+57.14%+0.20%+0.51%-0.30%-2.74%—
14d7+42.86%-0.16%-0.68%-0.82%-1.09%—
30d7+57.14%-3.71%-4.57%+0.86%-2.75%—
60d7(1 pending)+83.33%-10.79%-5.85%-4.95%-5.00%—
90d7(1 pending)+66.67%-1.09%-2.28%+1.19%-5.08%—
180d7(1 pending)+50.00%+1.19%+5.07%-3.88%-0.97%—
1y7(1 pending)+50.00%+1.47%+12.25%-10.78%-16.29%—
2y7(3 pending)+75.00%-16.59%+27.80%-44.39%-44.42%—
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
BIIB · 8,820 shares · as of Jun 9, 2026
02,2054,4106,6158,82020222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY ● SELL ●
2020
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 25 buys / 10 sellsCOVERAGE · 26 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
BIIB
BIOGEN INC.
PURCHASEGRANT
Stock grant
2,005——8,820Jun 9, 2026Jun 11, 2026 ↗View →
EXEL
EXELIXIS, INC.
PURCHASEGRANT
Stock grant
8,367——109,186May 27, 2026May 29, 2026 ↗View →
EXEL
EXELIXIS, INC.
SALE
20,634——0May 7, 2026May 8, 2026 ↗View →
EXEL
EXELIXIS, INC.
SALE
20,634$46.00$949.2K100,819May 7, 2026May 8, 2026 ↗View →
EXEL
EXELIXIS, INC.
PURCHASE
20,634$19.77$407.9K121,453May 7, 2026May 8, 2026 ↗View →
ARE
ALEXANDRIA REAL ESTATE EQUITIES, INC.
PURCHASEGRANT
Stock grant
3,493——10,946Jan 15, 2026Jan 15, 2026 ↗View →
BIIB
BIOGEN INC.
PURCHASEGRANT
Stock grant
2,370——6,815Jun 17, 2025Jun 18, 2025 ↗View →
EXEL
EXELIXIS, INC.
PURCHASEGRANT
Stock grant
9,812——100,819May 29, 2025May 30, 2025 ↗View →
EXEL
EXELIXIS, INC.
SALE
44,114$34.94$1.54M91,007Feb 14, 2025Feb 19, 2025 ↗View →
EXEL
EXELIXIS, INC.
SALE
28,240——0Feb 14, 2025Feb 19, 2025 ↗View →
EXEL
EXELIXIS, INC.
SALE
15,874——0Feb 14, 2025Feb 19, 2025 ↗View →
EXEL
EXELIXIS, INC.
PURCHASE
28,240$22.10$624.1K135,121Feb 14, 2025Feb 19, 2025 ↗View →
EXEL
EXELIXIS, INC.
PURCHASE
15,874$20.50$325.4K106,881Feb 14, 2025Feb 19, 2025 ↗View →
ARE
ALEXANDRIA REAL ESTATE EQUITIES, INC.
PURCHASEGRANT
Stock grant
2,032——7,453Jan 15, 2025Jan 16, 2025 ↗View →
EXEL
EXELIXIS, INC.
SALE
8,250$26.56$219.1K91,007Aug 14, 2024Aug 16, 2024 ↗View →
BIIB
BIOGEN INC.
PURCHASEGRANT
Stock grant
1,340——4,445Jun 21, 2024Jun 25, 2024 ↗View →
EXEL
EXELIXIS, INC.
PURCHASEGRANT
Stock grant
18,838——99,257May 31, 2024Jun 4, 2024 ↗View →
ARE
ALEXANDRIA REAL ESTATE EQUITIES, INC.
PURCHASEGRANT
Stock grant
1,585——5,421Jan 12, 2024Jan 16, 2024 ↗View →
BIIB
BIOGEN INC.
PURCHASEGRANT
Stock grant
960——3,105Jun 26, 2023Jun 28, 2023 ↗View →
EXEL
EXELIXIS, INC.
PURCHASEGRANT
Stock grant
20,718——80,419Jun 1, 2023Jun 2, 2023 ↗View →
ARE
ALEXANDRIA REAL ESTATE EQUITIES, INC.
PURCHASEGRANT
Stock grant
1,125——3,836Jan 13, 2023Jan 17, 2023 ↗View →
ARE
ALEXANDRIA REAL ESTATE EQUITIES, INC.
SALE
289$164.59$47.6K2,711Jul 29, 2022Jul 29, 2022 ↗View →
ARE
ALEXANDRIA REAL ESTATE EQUITIES, INC.
SALE
2,311$163.04$376.8K3,000Jul 28, 2022Jul 29, 2022 ↗View →
BIIB
BIOGEN INC.
PURCHASEGRANT
Stock grant
1,370——2,145Jun 15, 2022Jun 17, 2022 ↗View →
EXEL
EXELIXIS, INC.
PURCHASEGRANT
Stock grant
19,575——59,701May 26, 2022May 27, 2022 ↗View →
ARE
ALEXANDRIA REAL ESTATE EQUITIES, INC.
PURCHASEGRANT
Stock grant
738——5,311Jan 14, 2022Jan 14, 2022 ↗View →
BIIB
BIOGEN INC.
PURCHASEGRANT
Stock grant
775——775Jul 1, 2021Jul 2, 2021 ↗View →
EXEL
EXELIXIS, INC.
PURCHASEGRANT
Stock grant
8,299——40,126May 27, 2021May 28, 2021 ↗View →
EXEL
EXELIXIS, INC.
PURCHASEGRANT
Stock grant
16,598——16,598May 27, 2021May 28, 2021 ↗View →
EXEL
EXELIXIS, INC.
SALE
8,275$25.01$207.0K31,827May 11, 2021May 17, 2021 ↗View →
ARE
ALEXANDRIA REAL ESTATE EQUITIES, INC.
PURCHASEGRANT
Stock grant
921——4,573Jan 15, 2021Jan 18, 2021 ↗View →
EXEL
EXELIXIS, INC.
PURCHASEGRANT
Stock grant
15,456——15,456May 21, 2020May 22, 2020 ↗View →
EXEL
EXELIXIS, INC.
PURCHASEGRANT
Stock grant
7,728——40,102May 21, 2020May 22, 2020 ↗View →
ARE
ALEXANDRIA REAL ESTATE EQUITIES, INC.
SALE
1,465$174.20$255.2K3,652Feb 14, 2020Feb 14, 2020 ↗View →
ARE
ALEXANDRIA REAL ESTATE EQUITIES, INC.
PURCHASEGRANT
Stock grant
863——5,117Jan 15, 2020Jan 16, 2020 ↗View →
Other insiders · BIIB
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About this filer
CIK 0001547999
ROLE
Director
PRIMARY
BIIB
COMPANIES
3
ACTIVE SINCE
Jan 2020
MARKETPEEL · /INSIDER/0001547999DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
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