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BIIB
Biogen Inc. Common Stock
stock NASDAQ

At Close

Sep 15, 2026 3:59:59 PM EDT

216.28USD-0.497%(-1.08)755,891

215.99Bid 216.18Ask 0.19Spread

Pre-market

Sep 14, 2026 9:28:30 AM EDT

219.00USD+0.755%(+1.64)0

After-hours

Sep 15, 2026 4:37:30 PM EDT

216.17USD-0.051%(-0.11)105

OverviewOptionsHistoricalExchange VolumeShortsMore

BIIB Volume Sep 15, 2026

[NF]

Exchange	Day%	Volume	30D%
Off Exchange¹	50.82	271,396	43.55
Nasdaq GSM	20.06	107,112	37.90
IEX	8.09	43,212	5.22
NYSE Arca	6.04	32,244	3.82
Cboe BZX	5.11	27,307	3.21
Cboe BYX	2.90	15,500	0.62
Cboe EDGX	2.09	11,135	1.97
NYSE National	1.82	9,744	0.29
NYSE	1.11	5,925	1.40
MEMX	0.54	2,889	0.70
Nasdaq BX	0.40	2,143	0.37
Nasdaq PHLX	0.31	1,643	0.17
Cboe EDGA	0.28	1,500	0.30
MIAX Pearl	0.21	1,133	0.21
24X National	0.09	500	0.01
NYSE American	0.08	415	0.15
CHX	0.03	140	0.11
Texas Stock Exchange LLC	0.01	62	0.01

chartexchange.com

¹ A) Dark Pool or Off Exchange? B) Venues explained. C) All trades that update volume from the CTA.

BIIB Nutrition Facts

0.70 servings per container

Serving size

766.45K

Calories

534.00K

% Day

% Avg

Off Exchange¹ 271K

50.82%

43.55%

Nasdaq GSM 107K

20.06%

37.90%

IEX 43K

8.09%

5.22%

NYSE Arca 32K

6.04%

3.82%

Cboe BZX 27K

5.11%

3.21%

Cboe BYX 16K

2.90%

0.62%

Cboe EDGX 11K

2.09%

1.97%

NYSE National 10K

1.82%

0.29%

NYSE 6K

1.11%

1.40%

MEMX 3K

0.54%

0.70%

Nasdaq BX 2K

0.40%

0.37%

Nasdaq PHLX 2K

0.31%

0.17%

Cboe EDGA 2K

0.28%

0.30%

MIAX Pearl 1K

0.21%

24X National 500

0.09%

0.01%

NYSE American 415

0.08%

0.15%

CHX 140

0.03%

0.11%

Texas Stock Exchange LLC 62

0.01%

¹ A) Dark Pool or Off Exchange? B) Venues explained. C) All trades that update volume from the CTA.

chartexchange.com

BIIB Off Exchange & Dark Pool Summary

Today's Off Exchange & Dark Pool volume is 271,396, which is 50.82% of today's total volume.
Today's Lit volume is 262,604, which is 49.18%.
Over the past 30 days, the average Off Exchange & Dark Pool volume has been 43.55%.
The average Lit volume has been 56.45%.

BIIB Volume by Exchange

Off Exchange

Nasdaq GSM

IEX

NYSE Arca

Cboe BZX

Cboe BYX

Cboe EDGX

NYSE National

NYSE

MEMX

Nasdaq BX