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BIOGEN INC. (BIIB) Basic Shares Outstanding (Weighted Average)

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BIOGEN INC. Basic Shares Outstanding (Weighted Average)

BIOGEN INC. (BIIB) reported Basic Shares Outstanding (Weighted Average) of 147.20 million shares for the 3-month period ending 2026-03-31, per its 10-Q filed 2026-04-29.

Financial Statements › Income Statement › Earnings Per Share

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic · last filed 2026-04-29

  • BIOGEN INC. weighted average number of shares outstanding, basic for the quarter ending 2026-03-31 was 147.20M shares, a 0.75% increase year-over-year.
  • BIOGEN INC. weighted average number of shares outstanding, basic for the quarter ending 2025-12-31 was 146.80M shares, a 0.62% increase year-over-year.
  • BIOGEN INC. weighted average number of shares outstanding, basic for the quarter ending 2025-09-30 was 146.60M shares, a 0.62% increase year-over-year.
  • BIOGEN INC. weighted average number of shares outstanding, basic for the quarter ending 2025-06-30 was 146.50M shares, a 0.62% increase year-over-year.
  • BIOGEN INC. weighted average number of shares outstanding, basic for fiscal 2025 was 146.50M shares, a 0.62% increase from fiscal 2024.
  • BIOGEN INC. weighted average number of shares outstanding, basic for fiscal 2024 was 145.60M shares, a 0.62% increase from fiscal 2023.
  • BIOGEN INC. weighted average number of shares outstanding, basic for fiscal 2023 was 144.70M shares, a 0.41% decline from fiscal 2022.
  • BIOGEN INC. weighted average number of shares outstanding, basic for fiscal 2022 was 145.30M shares, a 2.55% decline from fiscal 2021.
Period endWeighted Average Number of Shares Outstanding, Basic 3 monthWeighted Average Number of Shares Outstanding, Basic 3 month as first filedWeighted Average Number of Shares Outstanding, Basic 6 monthWeighted Average Number of Shares Outstanding, Basic 6 month as first filedWeighted Average Number of Shares Outstanding, Basic 9 monthWeighted Average Number of Shares Outstanding, Basic 9 month as first filedWeighted Average Number of Shares Outstanding, Basic 12 monthWeighted Average Number of Shares Outstanding, Basic 12 month as first filed
2026-03-31147.20M shares
10-Q · filed 2026-04-29
147.00M shares
derived: average of 2 quarters · filed 2026-04-29
146.87M shares
derived: average of 3 quarters · filed 2026-04-29
146.78M shares
derived: average of 4 quarters · filed 2026-04-29
2025-12-31146.80M shares
derived: 10-K 12 month − 10-Q 9 month · filed 2026-02-06
146.70M shares
derived: average of 2 quarters · filed 2026-02-06
146.63M shares
derived: average of 3 quarters · filed 2026-02-06
146.50M shares
10-K · filed 2026-02-06
2025-09-30146.60M shares
10-Q · filed 2025-10-30
146.55M shares
derived: average of 2 quarters · filed 2025-10-30
146.40M shares
10-Q · filed 2025-10-30
146.28M shares
derived: average of 4 quarters · filed 2026-04-29
2025-06-30146.50M shares
10-Q · filed 2025-07-31
146.30M shares
10-Q · filed 2025-07-31
146.17M shares
derived: average of 3 quarters · filed 2026-04-29
146.05M shares
derived: average of 4 quarters · filed 2026-04-29
2025-03-31146.10M shares
10-Q · filed 2026-04-29
146.00M shares
derived: average of 2 quarters · filed 2026-04-29
145.90M shares
derived: average of 3 quarters · filed 2026-04-29
145.82M shares
derived: average of 4 quarters · filed 2026-04-29
2024-12-31145.90M shares
derived: 10-K 12 month − 10-Q 9 month · filed 2026-02-06
145.80M shares
derived: average of 2 quarters · filed 2026-02-06
145.73M shares
derived: average of 3 quarters · filed 2026-02-06
145.60M shares
10-K · filed 2026-02-06
2024-09-30145.70M shares
10-Q · filed 2025-10-30
145.65M shares
derived: average of 2 quarters · filed 2025-10-30
145.50M shares
10-Q · filed 2025-10-30
145.30M shares
derived: average of 4 quarters · filed 2026-02-06
2024-06-30145.60M shares
10-Q · filed 2025-07-31
145.40M shares
10-Q · filed 2025-07-31
145.17M shares
derived: average of 3 quarters · filed 2026-02-06
145.07M shares
derived: average of 4 quarters · filed 2026-02-06
2024-03-31145.20M shares
10-Q · filed 2025-05-01
144.95M shares
derived: average of 2 quarters · filed 2026-02-06
144.90M shares
derived: average of 3 quarters · filed 2026-02-06
144.85M shares
derived: average of 4 quarters · filed 2026-02-06
2023-12-31144.70M shares
derived: 10-K 12 month − 10-Q 9 month · filed 2026-02-06
144.75M shares
derived: average of 2 quarters · filed 2026-02-06
144.73M shares
derived: average of 3 quarters · filed 2026-02-06
144.70M shares
10-K · filed 2026-02-06
2023-09-30144.80M shares
10-Q · filed 2024-10-30
144.75M shares
derived: average of 2 quarters · filed 2024-10-30
144.70M shares
10-Q · filed 2024-10-30
144.43M shares
derived: average of 4 quarters · filed 2025-02-12
2023-06-30144.70M shares
10-Q · filed 2024-08-01
144.60M shares
10-Q · filed 2024-08-01
144.30M shares
derived: average of 3 quarters · filed 2025-02-12
144.32M shares
derived: average of 4 quarters · filed 2025-02-12
2023-03-31144.40M shares
10-Q · filed 2024-04-24
144.10M shares
derived: average of 2 quarters · filed 2025-02-12
144.20M shares
derived: average of 3 quarters · filed 2025-02-12
144.63M shares
derived: average of 4 quarters · filed 2025-02-12
2022-12-31143.80M shares
derived: 10-K 12 month − 10-Q 9 month · filed 2025-02-12
144.10M shares
derived: average of 2 quarters · filed 2025-02-12
144.70M shares
derived: average of 3 quarters · filed 2025-02-12
145.30M shares
10-K · filed 2025-02-12
2022-09-30144.40M shares
10-Q · filed 2023-11-08
145.15M shares
derived: average of 2 quarters · filed 2023-11-08
145.80M shares
10-Q · filed 2023-11-08
146.03M shares
derived: average of 4 quarters · filed 2024-02-14
2022-06-30145.90M shares
10-Q · filed 2023-07-25
146.50M shares
10-Q · filed 2023-07-25
146.57M shares
derived: average of 3 quarters · filed 2024-02-14
146.93M shares
derived: average of 4 quarters · filed 2024-02-14
2022-03-31147.10M shares
10-Q · filed 2023-04-25
146.90M shares
derived: average of 2 quarters · filed 2024-02-14
147.27M shares
derived: average of 3 quarters · filed 2024-02-14
147.88M shares
derived: average of 4 quarters · filed 2024-02-14
2021-12-31146.70M shares
derived: 10-K 12 month − 10-Q 9 month · filed 2024-02-14
147.35M shares
derived: average of 2 quarters · filed 2024-02-14
148.13M shares
derived: average of 3 quarters · filed 2024-02-14
149.10M shares
10-K · filed 2024-02-14
2021-09-30148.00M shares
10-Q · filed 2022-10-25
148.85M shares
derived: average of 2 quarters · filed 2022-10-25
149.90M shares
10-Q · filed 2022-10-25
150.82M shares
derived: average of 4 quarters · filed 2022-10-25
2021-06-30149.70M shares
10-Q · filed 2022-07-20
150.80M shares
10-Q · filed 2022-07-20
151.77M shares
derived: average of 3 quarters · filed 2022-07-20
153.05M shares
derived: average of 4 quarters · filed 2022-07-20
2021-03-31151.90M shares
10-Q · filed 2022-05-03
152.80M shares
derived: average of 2 quarters · filed 2022-05-03
154.17M shares
derived: average of 3 quarters · filed 2022-05-03
155.78M shares
derived: average of 4 quarters · filed 2022-05-03
2020-12-31153.70M shares
10-K · filed 2021-02-03
155.30M shares
derived: average of 2 quarters · filed 2021-10-20
157.07M shares
derived: average of 3 quarters · filed 2021-10-20
160.90M shares
10-K · filed 2023-02-15
2020-09-30156.90M shares
10-Q · filed 2021-10-20
158.75M shares
derived: average of 2 quarters · filed 2021-10-20
163.40M shares
10-Q · filed 2021-10-20
167.03M shares
derived: average of 4 quarters · filed 2021-10-20
2020-06-30160.60M shares
10-Q · filed 2021-07-22
166.70M shares
10-Q · filed 2021-07-22
170.40M shares
derived: average of 3 quarters · filed 2021-07-22
173.80M shares
derived: average of 4 quarters · filed 2021-07-22
2020-03-31172.80M shares
10-Q · filed 2021-04-22
175.30M shares
derived: average of 2 quarters · filed 2021-04-22
178.20M shares
derived: average of 3 quarters · filed 2021-04-22
181.22M shares
derived: average of 4 quarters · filed 2021-04-22
2019-12-31177.80M shares
10-K · filed 2021-02-03
180.90M shares
derived: average of 2 quarters · filed 2021-02-03
184.03M shares
derived: average of 3 quarters · filed 2021-02-03
187.10M shares
10-K · filed 2022-02-03
2019-09-30184.00M shares
10-K · filed 2021-02-03
187.15M shares
derived: average of 2 quarters · filed 2021-02-03
190.30M shares
10-Q · filed 2020-10-21
192.68M shares
derived: average of 4 quarters · filed 2021-02-03
2019-06-30190.30M shares
10-K · filed 2021-02-03
193.40M shares
10-Q · filed 2020-07-22
195.57M shares
derived: average of 3 quarters · filed 2021-02-03
197.03M shares
derived: average of 4 quarters · filed 2021-02-03
2019-03-31196.60M shares
10-K · filed 2021-02-03
198.20M shares
derived: average of 2 quarters · filed 2021-02-03
199.27M shares
derived: average of 3 quarters · filed 2021-02-03
201.22M shares
derived: average of 4 quarters · filed 2021-02-03
2018-12-31199.80M shares
10-K · filed 2020-02-06
200.60M shares
derived: average of 2 quarters · filed 2020-02-06
202.77M shares
derived: average of 3 quarters · filed 2020-02-06
204.90M shares
10-K · filed 2021-02-03
2018-09-30201.40M shares
10-K · filed 2020-02-06
204.25M shares
derived: average of 2 quarters · filed 2020-02-06
206.60M shares
10-Q · filed 2019-10-22
207.85M shares
derived: average of 4 quarters · filed 2020-02-06
2018-06-30207.10M shares
10-K · filed 2020-02-06
209.20M shares
10-Q · filed 2019-07-24
210.00M shares
derived: average of 3 quarters · filed 2020-02-06
210.35M shares
derived: average of 4 quarters · filed 2020-02-06
2018-03-31211.40M shares
10-K · filed 2020-02-06
211.45M shares
derived: average of 2 quarters · filed 2020-02-06
211.43M shares
derived: average of 3 quarters · filed 2020-02-06
211.55M shares
derived: average of 4 quarters · filed 2020-02-06
2017-12-31211.50M shares
10-K · filed 2019-02-06
211.45M shares
derived: average of 2 quarters · filed 2019-02-06
211.60M shares
derived: average of 3 quarters · filed 2019-02-06
212.60M shares
10-K · filed 2020-02-06
2017-09-30211.40M shares
10-K · filed 2019-02-06
211.65M shares
derived: average of 2 quarters · filed 2019-02-06
213.00M shares
10-Q · filed 2018-10-23
213.88M shares
derived: average of 4 quarters · filed 2019-02-06
2017-06-30211.90M shares
10-K · filed 2019-02-06
213.70M shares
10-Q · filed 2018-07-24
214.70M shares
derived: average of 3 quarters · filed 2019-02-06
215.75M shares
derived: average of 4 quarters · filed 2019-02-06
2017-03-31215.60M shares
10-K · filed 2019-02-06
216.10M shares
derived: average of 2 quarters · filed 2019-02-06
217.03M shares
derived: average of 3 quarters · filed 2019-02-06
217.55M shares
derived: average of 4 quarters · filed 2019-02-06
2016-12-31216.60M shares
10-K · filed 2018-02-01
217.75M shares
derived: average of 2 quarters · filed 2018-02-01
218.20M shares
derived: average of 3 quarters · filed 2018-02-01
218.40M shares
10-K · filed 2019-02-06
2016-09-30218.90M shares
10-K · filed 2018-02-01
219.00M shares
derived: average of 2 quarters · filed 2018-02-01
219.00M shares
10-Q · filed 2017-10-24
219.32M shares
derived: average of 4 quarters · filed 2018-02-01
2016-06-30219.10M shares
10-K · filed 2018-02-01
219.00M shares
10-Q · filed 2017-07-25
219.47M shares
derived: average of 3 quarters · filed 2018-02-01
222.65M shares
derived: average of 4 quarters · filed 2018-02-01
2016-03-31218.90M shares
10-K · filed 2018-02-01
219.65M shares
derived: average of 2 quarters · filed 2018-02-01
223.83M shares
derived: average of 3 quarters · filed 2018-02-01
226.70M shares
derived: average of 4 quarters · filed 2018-02-01
2015-12-31220.40M shares
10-K · filed 2017-02-02
226.30M shares
derived: average of 2 quarters · filed 2017-02-02
229.30M shares
derived: average of 3 quarters · filed 2017-02-02
230.70M shares
10-K · filed 2018-02-01
2015-09-30232.20M shares
10-K · filed 2017-02-02
232.19M shares
10-Q · filed 2015-10-21
233.75M shares
derived: average of 2 quarters · filed 2017-02-02
234.10M shares
10-Q · filed 2016-10-26
234.13M shares
10-Q · filed 2015-10-21
234.50M shares
derived: average of 4 quarters · filed 2017-02-02
2015-06-30235.30M shares
10-K · filed 2017-02-02
235.29M shares
10-Q · filed 2015-07-24
235.10M shares
10-Q · filed 2016-07-21
235.12M shares
10-Q · filed 2015-07-24
235.27M shares
derived: average of 3 quarters · filed 2017-02-02
235.50M shares
derived: average of 4 quarters · filed 2017-02-02
2015-03-31235.00M shares
10-K · filed 2017-02-02
235.00M shares
10-Q · filed 2015-04-24
235.25M shares
derived: average of 2 quarters · filed 2017-02-02
235.57M shares
derived: average of 3 quarters · filed 2017-02-02
235.85M shares
derived: average of 4 quarters · filed 2017-02-02
2014-12-31235.50M shares
10-K · filed 2016-02-03
235.85M shares
derived: average of 2 quarters · filed 2016-02-03
236.13M shares
derived: average of 3 quarters · filed 2016-02-03
236.40M shares
10-K · filed 2017-02-02
236.36M shares
10-K · filed 2015-02-04
2014-09-30236.20M shares
10-K · filed 2016-02-03
236.22M shares
10-Q · filed 2014-10-22
236.45M shares
derived: average of 2 quarters · filed 2016-02-03
236.64M shares
10-Q · filed 2015-10-21
236.48M shares
derived: average of 4 quarters · filed 2016-02-03
2014-06-30236.70M shares
10-K · filed 2016-02-03
236.66M shares
10-Q · filed 2014-07-23
236.73M shares
10-Q · filed 2015-07-24
236.57M shares
derived: average of 3 quarters · filed 2016-02-03
236.69M shares
derived: average of 4 quarters · filed 2016-02-03
2014-03-31236.80M shares
10-K · filed 2016-02-03
236.79M shares
10-Q · filed 2014-04-23
236.50M shares
derived: average of 2 quarters · filed 2016-02-03
236.69M shares
derived: average of 3 quarters · filed 2016-02-03
236.89M shares
derived: average of 4 quarters · filed 2016-02-03
2013-12-31236.21M shares
derived: 10-K 12 month − 10-Q 9 month · filed 2016-02-03
236.64M shares
derived: average of 2 quarters · filed 2016-02-03
236.92M shares
derived: average of 3 quarters · filed 2016-02-03
236.90M shares
10-K · filed 2016-02-03
236.92M shares
10-K · filed 2014-02-06
2013-09-30237.07M shares
10-Q · filed 2014-10-22
237.28M shares
derived: average of 2 quarters · filed 2014-10-22
237.13M shares
10-Q · filed 2014-10-22
237.04M shares
derived: average of 4 quarters · filed 2015-02-04
2013-06-30237.48M shares
10-Q · filed 2014-07-23
237.16M shares
10-Q · filed 2014-07-23
237.03M shares
derived: average of 3 quarters · filed 2015-02-04
236.89M shares
derived: average of 4 quarters · filed 2015-02-04
2013-03-31236.84M shares
10-Q · filed 2014-04-23
236.80M shares
derived: average of 2 quarters · filed 2015-02-04
236.69M shares
derived: average of 3 quarters · filed 2015-02-04
237.26M shares
derived: average of 4 quarters · filed 2015-02-04
2012-12-31236.76M shares
derived: 10-K 12 month − 10-Q 9 month · filed 2015-02-04
236.62M shares
derived: average of 2 quarters · filed 2015-02-04
237.41M shares
derived: average of 3 quarters · filed 2015-02-04
237.94M shares
10-K · filed 2015-02-04
2012-09-30236.47M shares
10-Q · filed 2013-10-28
237.73M shares
derived: average of 2 quarters · filed 2013-10-28
238.33M shares
10-Q · filed 2013-10-28
239.50M shares
derived: average of 4 quarters · filed 2014-02-06
2012-06-30238.99M shares
10-Q · filed 2013-07-25
239.39M shares
10-Q · filed 2013-07-25
240.51M shares
derived: average of 3 quarters · filed 2014-02-06
241.10M shares
derived: average of 4 quarters · filed 2014-02-06
2012-03-31239.75M shares
10-Q · filed 2013-04-25
241.27M shares
derived: average of 2 quarters · filed 2014-02-06
241.81M shares
derived: average of 3 quarters · filed 2014-02-06
241.95M shares
derived: average of 4 quarters · filed 2014-02-06
2011-12-31242.78M shares
derived: 10-K 12 month − 10-Q 9 month · filed 2014-02-06
242.83M shares
derived: average of 2 quarters · filed 2014-02-06
242.68M shares
derived: average of 3 quarters · filed 2014-02-06
242.40M shares
10-K · filed 2014-02-06
2011-09-30242.88M shares
10-Q · filed 2012-10-25
242.63M shares
derived: average of 2 quarters · filed 2012-10-25
242.27M shares
10-Q · filed 2012-10-25
241.57M shares
derived: average of 4 quarters · filed 2013-02-05
2011-06-30242.38M shares
10-Q · filed 2012-07-24
241.93M shares
10-Q · filed 2012-07-24
241.13M shares
derived: average of 3 quarters · filed 2013-02-05
240.81M shares
derived: average of 4 quarters · filed 2013-02-05
2011-03-31241.54M shares
10-Q · filed 2012-05-01
240.50M shares
derived: average of 2 quarters · filed 2013-02-05
240.29M shares
derived: average of 3 quarters · filed 2013-02-05
245.20M shares
derived: average of 4 quarters · filed 2013-02-05
2010-12-31239.47M shares
derived: 10-K 12 month − 10-Q 9 month · filed 2013-02-05
239.67M shares
derived: average of 2 quarters · filed 2013-02-05
246.42M shares
derived: average of 3 quarters · filed 2013-02-05
252.31M shares
10-K · filed 2013-02-05
2010-09-30239.86M shares
10-Q · filed 2011-10-28
249.90M shares
derived: average of 2 quarters · filed 2011-10-28
256.59M shares
10-Q · filed 2011-10-28
263.48M shares
derived: average of 4 quarters · filed 2012-02-03
2010-06-30259.94M shares
10-Q · filed 2011-07-26
265.02M shares
10-Q · filed 2011-07-26
271.35M shares
derived: average of 3 quarters · filed 2012-02-03
275.74M shares
derived: average of 4 quarters · filed 2012-02-03
2010-03-31269.92M shares
10-Q · filed 2011-04-21
277.05M shares
derived: average of 2 quarters · filed 2012-02-03
281.00M shares
derived: average of 3 quarters · filed 2012-02-03
282.91M shares
derived: average of 4 quarters · filed 2012-02-03
2009-12-31284.18M shares
derived: 10-K 12 month − 10-Q 9 month · filed 2012-02-03
286.55M shares
derived: average of 2 quarters · filed 2012-02-03
287.24M shares
derived: average of 3 quarters · filed 2012-02-03
287.36M shares
10-K · filed 2012-02-03
2009-09-30288.92M shares
10-Q · filed 2010-10-26
288.77M shares
derived: average of 2 quarters · filed 2010-10-26
288.42M shares
10-Q · filed 2010-10-26
289.18M shares
derived: average of 4 quarters · filed 2011-02-04
2009-06-30288.62M shares
10-Q · filed 2010-07-20
288.16M shares
10-Q · filed 2010-07-20
289.27M shares
derived: average of 3 quarters · filed 2011-02-04
289.80M shares
derived: average of 4 quarters · filed 2011-02-04
2009-03-31287.70M shares
10-Q · filed 2010-04-20
289.60M shares
derived: average of 2 quarters · filed 2011-02-04
290.20M shares
derived: average of 3 quarters · filed 2011-02-04
290.24M shares
derived: average of 4 quarters · filed 2011-02-04
2008-12-31291.49M shares
derived: 10-K 12 month − 10-Q 9 month · filed 2011-02-04
291.45M shares
derived: average of 2 quarters · filed 2011-02-04
291.08M shares
derived: average of 3 quarters · filed 2011-02-04
292.33M shares
10-K · filed 2011-02-04
2008-09-30291.41M shares
10-Q · filed 2009-10-21
290.88M shares
derived: average of 2 quarters · filed 2009-10-21
292.61M shares
10-Q · filed 2009-10-21
2008-06-30290.36M shares
10-Q · filed 2009-07-17
293.27M shares
10-Q · filed 2009-07-17
2007-12-31315.84M shares
10-K · filed 2010-02-09

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