Biogen Inc BIIB

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Biogen Inc. - Common Stock · Company · Nasdaq · Healthcare / Drug Manufacturers - General

Paper trade (simulated — no real money)

Fill: USD 250.6900 · FX 1 USD = 1.277900 SGD · about SGD 320.3567 per unit

Sign in to practise with simulated trades before investing real money. USD fills are converted into the SGD portfolio at the displayed rate.

Announcement types: (default: consequential filings)
Results & current reports
Capital markets
Ownership & governance

USD closing-price chart (daily close from yfinance · Last year)

USD 150.43 → 250.69 · 66.6%
253.840200.850147.860 1,2 3 4,5 6 7 8,9,10 11 12 13 14 15,16 17,18 19 20 21,22 23,24 25 26,27 Oct 25Jan 26Apr 26Jul 26Oct 26

Numbered dotted lines mark the filtered filings under Announcement Events below.

Price & SEC Filing History 25 Oct 2025 — 26 Oct 2026 (Last year)

Daily Nasdaq prices are sourced from yfinance. Yellow highlighting marks an intraday rise or a gap up between adjacent trading sessions. SEC acceptance times are converted to US Eastern time: pre-market filings appear below that day’s OHLCV row; filings accepted after the 09:30 ET open appear above it. The SEC does not publish an exact first-public-availability timestamp, so acceptance time is the best available proxy.

No data yet
Weekend
Weekend
251.6800 252.4400 246.1500 250.6900 1,157,287
240.6100 254.4100 240.0200 253.8400 2,237,800
242.0200 243.3200 240.1300 240.9800 812,900
236.7900 244.6500 235.9600 243.1000 1,492,200
231.8100 236.0000 231.0400 233.4800 949,700
Weekend
Weekend
235.7500 236.8700 232.3600 232.6500 1,462,600
236.4600 240.9900 235.2200 235.3500 1,572,400
228.9900 234.2000 228.0000 232.8300 1,947,100
230.3400 231.0400 226.7100 228.9000 1,049,100
233.9800 238.2400 229.0000 229.4100 1,461,700
Weekend
Weekend
220.6200 227.2000 219.2300 225.7100 815,000
220.1500 223.0900 215.7300 218.4300 1,339,000
222.9300 228.0000 221.4000 222.1500 1,298,100
224.5300 225.9700 218.0000 222.8900 1,008,100
219.9000 223.8500 218.2200 223.5900 951,300
Weekend
Weekend
222.9800 224.0800 219.8100 219.8800 779,900
225.5000 228.3100 222.5000 222.8200 1,755,300
227.2300 229.3600 225.5100 225.8800 1,553,300
227.0200 229.4100 224.4500 227.0700 1,161,200
225.8700 230.4900 225.5100 228.6900 1,332,300
Weekend
Weekend
228.2700 228.9200 223.7600 227.6000 958,000
226.8000 228.7200 224.3100 226.3600 1,034,600
226.9400 229.1900 222.3600 227.5300 1,494,300
219.2200 226.4300 219.0000 225.3600 1,111,700
216.1400 221.9200 214.5900 219.0700 928,500
Weekend
Weekend
219.0500 220.1700 215.2600 215.5000 2,634,700
217.6800 219.4100 215.3300 219.0500 836,700
216.4100 218.2900 214.8100 216.0100 606,500
216.7100 216.7100 213.5400 216.1700 756,000
221.0000 222.2500 215.5600 217.3600 629,900
Weekend
Weekend
216.7500 219.7600 214.7100 217.1500 1,075,600
209.9200 216.7000 208.9300 215.4300 936,600
210.5000 213.4800 209.0000 210.7300 694,600
215.4500 217.2800 210.5400 212.5000 617,600
No trading
Weekend
Weekend
221.1500 223.8200 219.8200 220.8300 465,100
225.4400 225.8000 221.2300 224.5100 550,700
218.2000 225.5900 216.9700 222.6700 1,268,200
218.1100 219.3000 213.6000 216.0400 785,500
216.4700 218.8900 213.5800 216.6500 831,000
Weekend
Weekend
221.1700 222.0000 216.7800 218.5000 517,400
219.3900 222.1100 217.5300 221.5000 497,300
219.3400 222.0000 218.6900 221.0700 647,200
218.9300 222.8500 218.0000 220.7700 495,400
216.4000 218.5000 213.9600 218.1200 649,800
Weekend
Weekend
217.7600 219.1200 215.0000 216.7800 722,300
217.9800 221.2900 214.1600 214.3500 808,600
215.3300 222.1500 215.0800 221.5600 886,800
211.0000 214.0700 210.0100 212.5500 694,000
208.3600 210.4900 207.6200 209.1500 617,100
Weekend
Weekend
210.0100 210.7900 208.2200 209.8300 554,400
212.9800 215.6100 208.7900 210.6500 860,100
203.5200 209.2200 201.0000 208.8700 789,000
206.6300 207.5700 203.5300 203.8900 936,800
206.7000 210.0200 206.2900 207.1300 706,400
Weekend
Weekend
207.3800 208.3100 204.1600 207.9400 840,500
208.7500 209.0300 202.0300 206.2800 892,600
210.6000 212.1800 205.8000 206.6300 873,700
200.9600 209.7400 199.9300 208.4500 1,205,400
203.3400 203.8500 199.5800 201.8200 940,900
Weekend
Weekend
207.5100 208.0500 202.5700 202.9500 1,062,000
204.3800 210.1900 203.0900 207.9300 892,900
210.5000 218.5900 206.2700 209.2300 2,400,100
27 · 10-Q Pre-market · 06:36 ET 10-Q ↗ 26 · 8-K Pre-market · 06:10 ET 8-K ↗
201.0100 207.7200 199.4000 205.6100 1,831,900
202.7500 204.4700 199.8300 200.1400 762,600
Weekend
Weekend
202.2400 203.3000 200.0400 202.1900 596,300
197.0400 203.6000 196.9200 200.6200 1,032,100
203.7000 204.3100 197.4000 197.7400 841,300
199.4700 203.7000 198.5900 203.1600 652,800
204.0800 205.6500 199.6200 199.9500 962,700
Weekend
Weekend
208.6000 215.7900 203.4000 205.9900 1,151,300
198.2600 209.6400 194.6700 208.9200 1,872,700
191.2100 198.5800 186.0300 197.2400 2,067,300
200.3400 202.0000 189.4000 191.9500 3,902,100
199.3300 210.8700 197.7400 209.0300 2,259,800
Weekend
Weekend
197.6300 199.9800 194.3700 199.1500 1,133,100
198.9200 201.0100 196.0000 198.9100 1,657,300
204.8600 206.7500 198.9300 200.3600 1,947,700
211.8600 212.0000 205.6500 205.7000 1,156,900
215.9500 215.9500 208.2700 208.4600 1,218,400
Weekend
Weekend
No trading
212.7400 219.0200 210.7500 216.1200 1,155,100
25 · 8-K After-hours · 16:08 ET 8-K ↗
215.2500 215.8100 209.6700 209.7400 1,138,600
218.0000 218.0000 212.5800 216.0600 1,091,300
215.7400 219.7200 214.0800 216.6300 1,279,800
Weekend
Weekend
202.5300 218.0600 202.2900 216.0300 2,374,400
201.6300 206.6700 200.2000 201.9600 1,328,900
199.3400 202.0600 198.6600 199.5900 1,348,800
198.8800 201.2200 197.0100 197.1900 1,053,500
199.4800 200.9800 194.7400 199.7100 1,675,000
Weekend
Weekend
No trading
200.2200 200.9900 193.2000 196.5800 1,729,800
195.1400 201.7500 194.0400 198.6700 1,009,000
199.6900 200.2600 194.0400 195.6100 1,110,700
198.3700 199.3700 195.8900 198.6400 883,900
Weekend
Weekend
200.5700 203.4500 199.0600 200.0500 837,300
195.4900 201.1800 194.2400 199.9600 914,700
24 · 8-K After-hours · 16:54 ET CURRENT REPORT ↗ 23 · 8-K/A After-hours · 16:49 ET CURRENT REPORT ↗
200.2100 201.9400 194.1000 194.2400 1,071,200
195.5100 199.6300 193.4500 199.1000 934,200
197.2500 198.7000 192.1800 192.6200 1,162,400
Weekend
Weekend
196.4500 200.6600 195.1400 195.3400 880,400
198.0000 199.9000 196.3500 196.4500 719,100
187.6900 196.5100 187.4800 195.9600 891,500
190.0900 190.5800 184.9000 188.8300 1,097,800
194.5000 195.2800 191.6700 192.2300 841,500
Weekend
Weekend
195.5500 198.4600 195.1100 196.0000 1,905,400
196.9700 198.0000 194.5000 196.3900 556,200
194.1100 199.8000 194.1100 196.9700 893,000
194.3000 195.5000 192.2700 193.0800 930,100
No trading
Weekend
Weekend
190.5300 194.7500 190.0100 193.7600 892,900
187.4000 190.2700 185.8500 189.4700 1,475,200
191.4100 193.3800 186.3700 187.8000 919,700
191.7200 193.0300 188.6400 190.5600 1,054,100
191.2500 193.3700 189.1900 191.9100 1,051,300
Weekend
Weekend
191.8300 194.9100 190.6600 192.9500 1,252,200
200.2500 205.0000 189.4900 191.3700 2,812,900
22 · 8-K Pre-market · 08:31 ET 8-K ↗ 21 · SC TO-T/A Pre-market · 07:53 ET SC TO-T/A ↗
199.3300 205.9700 198.8600 204.5300 1,271,900
198.4700 202.4000 196.4700 199.3600 1,145,400
20 · SC TO-T/A Pre-market · 07:06 ET AMENDMENT NO. 2 ↗
194.7600 200.3100 194.7500 197.9500 1,772,200
Weekend
Weekend
189.6800 195.2000 189.5000 193.4500 931,500
190.3400 192.1000 188.8600 191.3800 735,600
19 · SC TO-T/A After-hours · 16:37 ET AMENDMENT NO. 1 ↗
189.1300 191.1700 188.3000 190.6800 741,300
187.3800 189.6900 186.0000 189.1300 586,100
186.2800 187.5100 185.4400 187.2100 626,600
Weekend
Weekend
189.2800 190.5700 186.1400 187.0600 696,800
194.0200 195.9800 187.1600 189.2800 1,550,500
183.1200 195.8900 180.1800 194.3800 2,453,400
18 · 10-Q Pre-market · 06:40 ET 10-Q ↗ 17 · 8-K Pre-market · 06:05 ET 8-K ↗ 16 · DEFA14A After-hours · 16:42 ET DEFA14A ↗ 15 · DEF 14A After-hours · 16:34 ET DEF 14A ↗
182.4500 184.4100 181.8900 183.3800 1,235,600
183.1600 186.1500 179.1500 180.6700 1,101,400
Weekend
Weekend
186.6500 186.6500 183.1700 184.3800 723,300
189.4600 190.3200 187.0100 187.8800 816,300
189.3100 192.7500 188.6700 190.0700 1,327,900
184.5200 187.7400 181.7500 185.9500 1,063,200
179.5400 184.2600 178.7200 183.3400 1,484,400
Weekend
Weekend
176.2900 178.4100 175.6900 177.3500 1,239,500
178.8200 179.9900 174.8500 176.0200 953,500
179.3600 180.8700 177.7000 180.5400 1,168,700
177.7100 181.7700 177.4500 178.9600 1,550,600
14 · SC TO-T Pre-market · 07:02 ET SC TO-T ↗
172.6200 176.7900 171.2200 176.3700 1,415,000
Weekend
Weekend
177.9700 177.9700 172.3200 172.9700 1,501,900
177.8100 180.0600 174.9700 177.1100 1,266,500
178.2400 180.2400 176.3500 179.9000 1,289,700
13 · SC TO-C After-hours · 17:05 ET SCHEDULE TO ↗
172.2000 175.6400 170.4300 175.6100 1,515,500
177.0000 177.3900 168.6400 172.3400 2,149,100
12 · 8-K Pre-market · 06:31 ET 8-K ↗
Weekend
Weekend
11 · SC TO-C After-hours · 17:10 ET SCHEDULE TO ↗
No trading
181.4600 182.2300 176.3900 177.3400 1,339,300
183.1600 186.3100 181.7100 183.7800 1,390,200
10 · SC TO-C After-hours · 17:08 ET SC TO-C ↗ 9 · 8-K After-hours · 17:03 ET 8-K ↗ 8 · SC TO-C After-hours · 17:01 ET SCHEDULE TO ↗
179.4600 184.6800 171.3700 183.3300 2,719,800
186.1600 190.0900 185.5100 187.5700 799,900
Weekend
Weekend
191.0600 191.0600 183.0100 183.8400 935,100
189.0000 192.2800 188.3600 191.0600 879,100
184.9100 189.3800 184.9100 189.1800 775,200
182.6300 184.8400 180.3300 183.9400 644,100
183.4800 185.0000 183.0000 183.6400 1,011,800
Weekend
Weekend
183.1300 183.6900 180.4700 181.4600 2,214,200
182.1800 185.4500 181.6800 183.4100 768,600
184.1300 184.3200 180.4800 182.3100 846,200
184.7300 186.5200 183.2000 185.2900 810,200
182.7500 184.6200 181.8800 183.2600 995,900
Weekend
Weekend
185.9900 188.0000 181.4600 181.5500 1,092,300
187.8600 188.9100 184.6300 184.9000 851,400
7 · 8-K After-hours · 17:28 ET CURRENT REPORT ↗
187.5400 192.9900 187.5400 190.4800 864,300
187.6900 190.7800 187.0200 188.4100 687,500
183.9100 188.5000 182.6000 188.2400 651,600
Weekend
Weekend
186.2500 186.2500 181.2400 184.8700 772,800
187.9700 190.9900 185.9500 188.0800 893,300
185.0600 190.3700 183.1600 189.9400 952,900
185.0100 187.0500 181.7900 184.0200 1,049,900
190.2200 190.7500 186.7200 188.0500 691,600
Weekend
Weekend
187.5100 192.4600 186.6200 191.8200 1,402,100
190.3000 190.7400 185.9000 188.0200 988,000
194.2300 196.7300 189.8900 190.7300 942,700
196.0300 198.7200 194.4300 195.1300 716,000
191.8200 197.0500 189.1100 196.3400 878,900
Weekend
Weekend
190.7800 192.6000 189.9500 192.0300 799,200
193.5100 195.0000 191.0500 192.0800 993,200
195.3200 195.6800 193.1100 194.1300 1,049,000
197.4600 200.2900 193.3700 195.6200 986,500
No trading
Weekend
Weekend
196.2700 199.5000 195.5200 196.5200 1,352,800
190.1500 196.0000 189.0000 195.5000 1,657,300
6 · 8-K After-hours · 17:07 ET 8-K ↗
188.3500 192.0000 187.2000 191.2000 996,900
194.0700 195.7200 188.7400 188.9900 1,836,100
199.8300 201.0000 191.8800 193.8100 2,096,200
Weekend
Weekend
187.0100 202.4100 184.6000 201.1800 3,404,900
5 · 10-K Pre-market · 07:36 ET 10-K ↗ 4 · 8-K Pre-market · 06:55 ET 8-K ↗
184.8700 187.7300 184.5400 185.3600 2,542,600
177.2500 186.2400 177.1000 185.4500 2,076,000
177.7900 182.6700 176.1900 176.7600 1,594,100
179.3000 180.7600 177.5800 179.0900 1,288,800
Weekend
Weekend
177.0900 180.1400 175.9600 179.8900 1,488,000
174.8800 177.2000 173.5100 176.1800 1,146,700
173.6300 175.0600 170.8500 174.8300 1,304,500
173.0200 176.1400 172.2300 174.1200 748,100
171.6700 174.3100 170.5900 173.1200 1,049,200
Weekend
Weekend
173.1700 173.9000 170.0400 171.5900 1,250,500
171.7800 175.2900 171.6500 173.8000 996,400
165.3100 172.8700 165.3100 172.6200 1,447,100
161.5100 165.6100 160.3600 165.3800 1,879,900
No trading
Weekend
Weekend
168.8700 169.3400 163.7400 164.4200 1,816,100
169.0300 169.7900 166.7900 168.5700 1,562,600
177.7300 178.4100 165.5800 169.3100 3,635,800
3 · 8-K Next filing day · accepted 13 Jan, 17:38 ET 8-K ↗
185.4200 186.3200 177.0500 178.3000 1,597,400
188.0000 188.0000 182.7300 185.6300 1,280,300
Weekend
Weekend
186.7400 190.2000 186.4900 187.6200 1,416,700
187.0200 187.7700 183.5000 186.0000 1,622,700
181.7000 187.0600 181.7000 186.9100 2,122,400
174.9400 182.9700 174.3000 182.6100 2,115,700
175.7300 180.5600 171.6100 174.6300 1,663,600
Weekend
Weekend
175.3700 178.2400 174.2800 177.8200 1,095,600
No trading
175.7600 177.1900 175.0200 175.9900 890,400
176.3000 176.9900 175.7200 176.4000 609,800
177.0000 178.4600 176.3100 176.8300 928,100
Weekend
Weekend
175.3000 177.1900 175.0000 177.0800 687,400
No trading
175.7300 177.1800 175.3700 176.3300 434,700
174.2600 175.5800 173.0800 174.8200 1,281,600
174.7800 177.2900 172.9000 174.7000 1,909,500
Weekend
Weekend
171.3200 176.4200 170.0000 174.8000 14,994,800
171.5900 173.0000 168.5600 169.9100 2,761,000
171.4300 173.8300 169.5500 172.1000 2,783,500
174.5100 174.5100 169.5200 171.5000 2,408,300
173.6700 175.9400 170.4500 175.7400 2,291,500
Weekend
Weekend
173.4900 175.0800 171.2700 174.1000 1,781,500
177.4700 180.7900 172.0000 172.5000 2,721,400
173.3000 178.1700 169.2400 177.5500 2,147,900
179.9100 181.9900 175.3900 175.8400 1,506,600
181.3000 182.1200 179.2100 180.4400 1,474,200
Weekend
Weekend
181.9600 183.1500 181.1000 181.3000 1,210,000
181.8600 182.6900 179.2700 181.9800 1,246,300
180.1700 182.9400 178.0500 180.7500 1,845,100
177.3200 180.5500 174.5300 180.1800 1,866,300
180.1500 181.7800 175.8800 177.7800 1,946,900
Weekend
Weekend
182.0700 182.7400 180.6900 182.0900 566,400
No trading
181.9600 183.9300 180.7600 181.9400 1,482,900
177.0700 182.9700 176.0900 181.9600 2,344,500
177.6500 185.1700 175.5700 176.8200 4,164,200
Weekend
Weekend
168.5400 176.0200 167.4200 175.3000 2,268,000
168.1500 170.9100 165.7500 168.1800 1,914,500
168.8300 168.9000 165.7900 167.9300 1,766,000
164.4000 170.7800 163.0000 168.8300 2,257,400
167.0000 167.9700 163.5000 164.6800 2,244,600
Weekend
Weekend
164.7200 169.0000 163.0000 167.5500 2,620,400
161.5700 167.8700 161.2000 164.7300 2,993,000
160.0000 162.5600 158.0500 161.4800 1,659,700
156.7600 159.9500 154.2000 159.5600 1,504,500
155.4100 156.5500 153.7700 156.2600 1,258,600
Weekend
Weekend
156.7000 156.7000 151.8300 155.5100 1,552,000
155.7600 157.8000 153.7600 156.7400 1,848,500
149.6600 153.6800 148.5100 153.4300 1,806,000
150.8900 152.9000 149.0500 149.3300 2,028,900
153.6000 155.3300 149.6300 151.4400 2,197,200
Weekend
Weekend
147.9900 155.1800 146.5200 154.2700 2,235,300
140.1000 154.4400 138.0000 149.6100 2,745,200
2 · 10-Q Pre-market · 06:31 ET 10-Q ↗ 1 · 8-K Pre-market · 06:13 ET 8-K ↗
148.8200 149.9100 147.5400 147.8600 2,450,700
150.0100 150.3000 148.3700 149.1300 1,662,800
150.0700 150.9200 148.1000 150.4300 1,214,300
Weekend
Weekend

Announcement Events

Each title opens the filing on the SEC website. Registered users can summarise the filing and up to seven relevant exhibits linked within the same SEC submission.

27 10-Q 10-Q (opens SEC filing in a new tab) Pre-market · 06:36 ET Summarise
26 8-K 8-K (opens SEC filing in a new tab) Pre-market · 06:10 ET Summarise
25 8-K 8-K (opens SEC filing in a new tab) After-hours · 16:08 ET Summarise
24 8-K CURRENT REPORT (opens SEC filing in a new tab) After-hours · 16:54 ET Summarise
23 8-K/A CURRENT REPORT (opens SEC filing in a new tab) After-hours · 16:49 ET Summarise
22 8-K 8-K (opens SEC filing in a new tab) Pre-market · 08:31 ET Summarise
21 SC TO-T/A SC TO-T/A (opens SEC filing in a new tab) Pre-market · 07:53 ET Summarise
20 SC TO-T/A AMENDMENT NO. 2 (opens SEC filing in a new tab) Pre-market · 07:06 ET Summarise
19 SC TO-T/A AMENDMENT NO. 1 (opens SEC filing in a new tab) After-hours · 16:37 ET Summarise
18 10-Q 10-Q (opens SEC filing in a new tab) Pre-market · 06:40 ET Summarise
17 8-K 8-K (opens SEC filing in a new tab) Pre-market · 06:05 ET Summarise
16 DEFA14A DEFA14A (opens SEC filing in a new tab) After-hours · 16:42 ET Summarise
15 DEF 14A DEF 14A (opens SEC filing in a new tab) After-hours · 16:34 ET Summarise
14 SC TO-T SC TO-T (opens SEC filing in a new tab) Pre-market · 07:02 ET Summarise
13 SC TO-C SCHEDULE TO (opens SEC filing in a new tab) After-hours · 17:05 ET Summarise
12 8-K 8-K (opens SEC filing in a new tab) Pre-market · 06:31 ET Summarise
11 SC TO-C SCHEDULE TO (opens SEC filing in a new tab) After-hours · 17:10 ET Summarise
10 SC TO-C SC TO-C (opens SEC filing in a new tab) After-hours · 17:08 ET Summarise
9 8-K 8-K (opens SEC filing in a new tab) After-hours · 17:03 ET Summarise
8 SC TO-C SCHEDULE TO (opens SEC filing in a new tab) After-hours · 17:01 ET Summarise
7 8-K CURRENT REPORT (opens SEC filing in a new tab) After-hours · 17:28 ET Summarise
6 8-K 8-K (opens SEC filing in a new tab) After-hours · 17:07 ET Summarise
5 10-K 10-K (opens SEC filing in a new tab) Pre-market · 07:36 ET Summarise
4 8-K 8-K (opens SEC filing in a new tab) Pre-market · 06:55 ET Summarise
3 8-K 8-K (opens SEC filing in a new tab) Next filing day · accepted 13 Jan, 17:38 ET Summarise
2 10-Q 10-Q (opens SEC filing in a new tab) Pre-market · 06:31 ET Summarise
1 8-K 8-K (opens SEC filing in a new tab) Pre-market · 06:13 ET Summarise