when did biogen go public

Biogen (BIIB) went public on September 16, 1991.

DATE OPEN HIGH LOW CLOSE VOLUME
November 2024
$173.65
$179.20
$163.35
$164.89
18,693,455
October 2024
$194.61
$195.00
$173.88
$174.00
30,796,000
September 2024
$204.22
$206.70
$188.78
$193.84
21,981,500
August 2024
$215.80
$219.44
$196.90
$204.76
19,658,300
July 2024
$231.41
$238.00
$209.75
$213.20
22,031,600
June 2024
$225.30
$237.54
$220.02
$231.82
21,028,900
May 2024
$215.56
$236.90
$210.33
$224.94
22,549,700
April 2024
$215.69
$218.86
$189.44
$214.82
28,895,100
March 2024
$217.46
$230.22
$211.02
$215.63
26,465,900
February 2024
$245.40
$249.33
$215.68
$216.99
25,350,200
January 2024
$257.56
$268.30
$240.83
$246.66
20,223,900
December 2023
$233.95
$263.98
$229.16
$258.77
23,770,000
November 2023
$238.56
$251.51
$220.86
$234.08
23,323,200
October 2023
$255.85
$269.43
$233.76
$237.54
21,996,900
September 2023
$269.01
$270.50
$251.85
$257.01
16,165,500
August 2023
$269.36
$278.95
$259.76
$267.36
18,353,400
July 2023
$282.87
$287.60
$256.13
$270.19
28,757,300
June 2023
$301.02
$319.76
$277.71
$284.85
23,443,200
May 2023
$305.75
$319.74
$291.64
$296.41
21,338,500
April 2023
$276.34
$305.50
$273.39
$304.23
17,355,400
March 2023
$267.97
$279.00
$254.80
$278.03
19,959,000
February 2023
$289.57
$293.47
$266.77
$269.86
17,526,100
January 2023
$276.73
$295.90
$265.32
$290.90
24,119,500
December 2022
$305.51
$306.28
$272.20
$276.92
23,481,700
November 2022
$283.44
$311.88
$274.63
$305.17
27,706,200