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BIIBNasdaq · Biological Products, (No Diagnostic Substances)

BIOGEN INC.

Alert me on BIIB
0
Insider buys, 6 months
8
Congress trades, 6 months
0
Signals, 6 months

Six months

BIIB stock chart by TradingView

After each filing

15
Oct 7 Sale Rep. Maria Elvira Salazar House
1 week
+7.7%S&P −0.3%
1 month
Result in10 trading days
3 months
Result in52 trading days
6 months
Result in115 trading days
Sep 1 Sale Rep. Kevin Hern House
1 week
−3.3%S&P −1.0%
1 month
−1.3%S&P +0.8%
3 months
Result in27 trading days
6 months
Result in90 trading days
Aug 6 Sale Minor Lloyd Insider
1 week
+2.1%S&P +1.2%
1 month
+7.1%S&P +0.2%
3 months
Result in8 trading days
6 months
Result in71 trading days
Jul 21 Buy Sen. Alan Armstrong Senate
1 week
+5.8%S&P −2.4%
1 month
+8.4%S&P +2.0%
3 months
+22.9%S&P +3.2%
6 months
Result in60 trading days
Jul 7 Sale Rep. Maria Elvira Salazar House
1 week
−1.6%S&P +1.3%
1 month
+3.0%S&P +3.1%
3 months
+11.2%S&P +4.8%
6 months
Result in50 trading days
Show all 15
Jul 2 Buy Rep. Gilbert Cisneros House
1 week
+0.3%S&P −0.3%
1 month
0.0%S&P +2.7%
3 months
+5.5%S&P +2.7%
6 months
Result in48 trading days
Jun 8 Buy Rep. Maria Elvira Salazar House
1 week
−1.8%S&P +1.8%
1 month
0.0%S&P +2.7%
3 months
+5.8%S&P +3.7%
6 months
Result in31 trading days
Feb 18 Buy Murphy Nicole Insider
1 week
−1.8%S&P +1.0%
1 month
−5.5%S&P −3.9%
3 months
−1.8%S&P +7.2%
6 months
+14.1%S&P +12.7%
Feb 13 Buy Rep. Gilbert Cisneros House
1 week
−0.3%S&P +0.7%
1 month
−6.8%S&P −3.1%
3 months
−1.9%S&P +8.5%
6 months
+8.7%S&P +13.0%
Feb 11 Sale Singhal Priya Insider
1 week
+0.5%S&P −1.1%
1 month
−5.0%S&P −4.3%
3 months
+7.0%S&P +7.6%
6 months
+10.2%S&P +13.0%
Feb 4 Sale Singhal Priya Insider
1 week
+3.1%S&P +0.8%
1 month
−0.3%S&P −2.0%
3 months
+2.8%S&P +7.2%
6 months
+11.2%S&P +12.6%
Sep 3, 2025 Sale Singhal Priya Insider
1 week
+0.7%S&P +1.3%
1 month
+9.6%S&P +4.2%
3 months
+27.2%S&P +6.2%
6 months
+32.8%S&P +6.4%
Jun 9, 2025 Buy Rep. Rob Bresnahan House
1 week
−6.6%S&P −0.9%
1 month
−0.9%S&P +3.7%
3 months
+5.3%S&P +8.5%
6 months
+29.8%S&P +13.9%
May 8, 2025 Sale Rep. Rob Bresnahan House
1 week
+6.3%S&P +5.3%
1 month
+14.7%S&P +6.9%
3 months
+8.3%S&P +13.0%
6 months
+31.6%S&P +19.6%
Mar 27, 2025 Buy Rep. Rob Bresnahan House
1 week
−11.1%S&P −9.1%
1 month
−13.2%S&P −0.2%
3 months
−9.2%S&P +11.5%
6 months
+0.1%S&P +20.1%

Every purchase and sale on this ticker reported by a member of Congress or an insider, measured from the close of the first trading day after it became public to the close 1 week, 1 month, 3 months and 6 months later, each beside the S&P over the same days.

Filings for BIIB

61 held · newest 561 held · newest 2
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See all 61 filings for BIIB

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Government contracts, last 12 months

Awards of $10M and up, from USAspending · context, not a signal
No contracts of $10M or more in the last 12 months.

Lobbying

Last four quarters
$770KQ4 2025
$1.5MQ1 2026
$1.1MQ2 2026
$880KQ3 2026
Down 17 percent from Q2 2026. Reported by the company to the Senate each quarter.Original report ↗

Read from LDA.gov between Sep 23, 2026 and Oct 21, 2026. Senate Office of Public Records cannot vouch for the data or analyses derived from these data after the data have been retrieved from LDA.gov.