$225.88▼ −1.19 · −0.5%from $227.07 the session before · Sep 30, 2026 close · end of day
Open
$227.23
High
$229.36
Low
$225.51
Day's range
$3.91.7% of the previous close
VWAP
$226.93close −0.46% from it
Volume, shares
1.55M1.56× the 20-session average
Traded, $
$352.5M
Trades
26.5K59 shares per trade
Previous close
$227.07−1.19 to the close
Market cap
$33.35Bat the close of Sep 30
Day range10% of the way up
$225.51$229.36
52-week range93% of the way up
$168.64 Apr 6$230.49 Sep 28
−2.0% from the high · +34% from the low
Options
No listed options on BIIB
Close $ · S&P 500 rebased to the first close126 sessions to Sep 30 · axis fixed at 4 × ATR-14 around the last close · hover or tap a session and the read beside the chart follows it
Revenue $2.48B, +1.9% on a year earlier; profit $319.5M, +33% in the Mar 2026 quarter, consolidated.
Last 8 quarters, consolidatedUS dollars as filed · year on year against the same quarter a year earlier · market: close on the first session after the filing against the last close before it, S&P 500 over the same session
Quarterly results of BIIB on the consolidated basis with the market's move on the first session after each filing
Quarter
Revenue $
Revenue YoY
Profit $
Profit YoY
EPS $
Market on the day
Mar 2026filed Apr 29
$2.48B
▲ +1.9%
$319.5M
▲ +33%
2.15
▼ −2.6%S&P 500 +1.0% · −3.6 pp
Dec 2025filed Feb 6
$2.28B
▼ −7.1%
−$48.9M
▼ −120%
-0.35
—not reached
Sep 2025filed Oct 30
$2.53B
▲ +2.8%
$466.5M
▲ +20%
3.17
—not reached
Jun 2025filed Jul 31
$2.65B
▲ +7.3%
$634.8M
▲ +8.8%
4.33
—not reached
Mar 2025filed Apr 29
$2.43B
▲ +6.1%
$240.5M
▼ −39%
1.64
▼ −2.6%S&P 500 +1.0% · −3.6 pp
Dec 2024filed Feb 12
$2.45B
▲ +2.9%
$266.7M
▲ +6.8%
1.82
—not reached
Sep 2024filed Oct 30
$2.47B
▼ −2.5%
$388.5M
—
2.66
—not reached
Jun 2024filed Jul 31
$2.46B
▲ +0.36%
$583.6M
▼ −1.3%
4.00
—not reached
By fiscal yearfiscal years as filed in the 10-K · named by the year the fiscal year ends
Financial-year results of BIIB on the consolidated basis, summed from the quarters filed
Year
Revenue $
Revenue YoY
Profit $
Profit YoY
EPS $
FY25to Dec 2025
$9.89B
▲ +2.2%
$1.29B
▼ −21%
8.79
FY24to Dec 2024
$9.68B
▼ −1.6%
$1.63B
▲ +41%
11.18
FY23to Dec 2023
$9.84B
▼ −3.3%
$1.16B
▼ −62%
7.97
FY22to Dec 2022
$10.17B
▼ −7.4%
$3.05B
▲ +96%
20.87
FY21to Dec 2021
$10.98B
▼ −18%
$1.56B
▼ −61%
10.40
Fundamentals
consolidated · filings to Mar 2026 · close $225.88 on Sep 30
BIIB trades at 24 times trailing earnings, 2.3 times book value, revenue +1.2% over twelve months, market cap $33.35B.
Valuation
Market cap
$33.35Bon Sep 30
Price to earnings
24consolidated · four quarters to Mar 2026
Trailing EPS
$9.30diluted · consolidated · four quarters to Mar 2026
Price to book
2.3consolidated · balance sheet to Dec 2023
Book value a share
$100.24consolidated · balance sheet to Dec 2023
Debt to equity
0.46borrowings over equity · consolidated · balance sheet to Dec 2023
Return on equity
9.3%trailing profit over average equity · consolidated
Dividend yield
—
Price to sales
3.4market cap over revenue, four quarters to Mar 2026
Shares outstanding
148Mon Sep 30
Growthsums of the four quarters filed to Mar 2026 · growth against the four quarters before them · consolidated
Revenue, trailing 12 months
$9.94Bfour quarters to Mar 2026
Revenue growth, 12 months
▲ +1.2%against the twelve months before
Revenue 3-year CAGR
▼ −0.55%trailing twelve months against the twelve months 3 years earlier · consolidated
Profit, trailing 12 months
$1.37Bfour quarters to Mar 2026
Profit growth, 12 months
▼ −7.3%against the twelve months before
Profit 3-year CAGR
▼ −24%trailing twelve months against the twelve months 3 years earlier · consolidated
Shareholding
quarter to Jun 2026 · SEC Form 13F
13F managers hold 190% of shares, FMR LLC the largest at 25%, BlackRock, Inc. 22% and PRIMECAP MANAGEMENT CO/CA/ 21%, as filed for the quarter to Jun 2026.
24.7%21.7%20.5%121.4%
FMR LLC 24.7%
BlackRock, Inc. 21.7%
PRIMECAP MANAGEMENT CO/CA/ 20.5%
Other 13F managers 121.4%
Held by 13F managers
190%of shares outstanding
Shares held
278M+5.3% on Mar 2026 among managers filing both
Managers holding
976942 a quarter earlier
Largest holder
25%FMR LLC
Largest 10 holderspercent of shares outstanding · change in shares against the previous quarter
Largest 13F holders of BIIB
Manager
Shares
Of outstanding
Value
Change on quarter
FMR LLC
36.4M
25%
$7.87B
+10.8M
BlackRock, Inc.
32M
22%
$6.91B
+22.3K
PRIMECAP MANAGEMENT CO/CA/
30.3M
21%
$6.55B
+794K
VANGUARD CAPITAL MANAGEMENT LLC
19.3M
13%
$4.17B
+227K
STATE STREET CORP
14.7M
9.9%
$3.17B
+353K
VANGUARD PORTFOLIO MANAGEMENT LLC
13.2M
8.9%
$2.85B
+146K
GEODE CAPITAL MANAGEMENT, LLC
8.9M
6.0%
$1.92B
+213K
WELLINGTON MANAGEMENT GROUP LLP
6.23M
4.2%
$1.35B
+312K
NORGES BANK
5.16M
3.5%
$1.11B
—
MORGAN STANLEY
4.82M
3.3%
$1.04B
+481K
Insider tradesSEC Forms 3, 4 and 5 · the latest 10
No open-market insider buying or selling in the last 90 days.
BIIB insider trades
Insider
Trade
Shares
Price
Held after
Freire Maria CDirector
granted · Jun 9, 2026
2,005
$0.00
8,820
Minor LloydDirector
granted · Jun 9, 2026
1,505
$0.00
3,875
Pangalos Menelas NDirector
exercised · Jun 9, 2026
2,370
$0.00
2,370
Pangalos Menelas NDirector
granted · Jun 9, 2026
1,505
$0.00
3,875
Patolawala Monish DDirector
granted · Jun 9, 2026
1,505
$0.00
5,215
LANGER SUSANDirector
granted · Jun 9, 2026
1,505
$0.00
6,634
Mantas Jesus BDirector
granted · Jun 9, 2026
1,505
$0.00
11,263
Rowinsky Eric KDirector
granted · Jun 9, 2026
1,505
$0.00
25,844
SHERWIN STEPHEN ADirector
granted · Jun 9, 2026
1,505
$0.00
15,193
HAWKINS WILLIAM ADirector
granted · Jun 9, 2026
1,505
$0.00
10,365
Corporate actions
exchange records
No corporate action on record for BIIB yet.
Price history
131 sessions on record · to Sep 30 · end of day
BIIB is +4.5% over 20 sessions against the S&P 500's +0.1%, 2.0% below its 52-week high, realised volatility 26% annualised.
Returns against S&P 500longest window first · S&P 500 over the same sessions
Returns of the stock and S&P 500 over six windows, longest first
Window
From $
BIIB %
S&P 500 %
Difference pp
120 sessionssince Apr 9
$177.11
▲ +28%
▲ +12%
+15
60 sessionssince Jul 7
$205.70
▲ +9.8%
▲ +2.0%
+7.8
20 sessionssince Sep 1
$216.05
▲ +4.5%
▲ +0.11%
+4.4
5 sessionssince Sep 23
$227.54
▼ −0.73%
▼ −0.67%
−0.06
1 sessionsince Sep 29
$227.06
▼ −0.52%
▼ −0.21%
−0.31
Averages of the closeclose against each average
5-session average
$227.12close −0.55% from it
20-session average
$220.77close +2.3% from it
50-session average
$214.41close +5.3% from it
Range and volumetrue range over 14 sessions · high to low over 20 · volume against the 20-session average
Average true range, 14
$5.22.3% of the close
Average day's range, 20
$5.62.5% of the close
Volume against 20 sessions
1.56×1.55M vs 1.03M average
Volatility and co-movement with S&P 500annualised from daily returns
Realised volatility, 20
26%≈ ±1.6% a session · moved more than that on 6 of 20
Realised volatility, 60
35%≈ ±2.2% a session · moved more than that on 16 of 60
Beta to S&P 500, 60
0.29moved with S&P 500 on 43 of 60 sessions
Up and down sessionscloses above and below the previous close
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