when did regeneron pharmaceuticals go public

Regeneron Pharmaceuticals (REGN) went public on April 2, 1991, when it opened at $21.88.

DATEOPENHIGHLOWCLOSEVOLUME
December 2025
$775.60
$779.92
$731.00
$742.00
1,916,666
November 2025
$656.64
$790.98
$624.36
$780.19
21,434,600
October 2025
$570.16
$663.17
$540.32
$650.98
25,458,800
September 2025
$579.81
$602.71
$548.51
$561.57
22,624,700
August 2025
$581.40
$609.69
$541.39
$579.97
21,419,400
July 2025
$522.52
$576.13
$519.56
$543.95
19,653,100
June 2025
$489.73
$536.71
$475.17
$523.55
27,780,600
May 2025
$587.27
$615.81
$483.66
$488.92
31,067,600
April 2025
$627.84
$638.52
$523.76
$596.22
25,663,600
March 2025
$698.94
$745.12
$615.89
$631.54
20,912,300
February 2025
$665.11
$735.87
$638.46
$695.78
17,887,000
January 2025
$716.88
$739.18
$662.58
$669.27
17,766,800
December 2024
$745.87
$796.57
$689.18
$708.40
18,051,400
November 2024
$839.95
$857.25
$731.89
$746.08
16,783,800
October 2024
$1,048.25
$1,055.74
$811.49
$833.58
17,457,700
September 2024
$1,172.23
$1,185.96
$1,002.85
$1,045.44
12,689,200
August 2024
$1,055.01
$1,204.52
$1,036.10
$1,178.16
10,420,300
July 2024
$1,041.33
$1,100.06
$1,006.09
$1,073.24
8,543,300
June 2024
$974.75
$1,075.21
$973.86
$1,045.23
9,285,600
May 2024
$884.50
$992.37
$883.62
$974.75
9,455,700
April 2024
$959.41
$964.85
$870.40
$885.75
10,148,700
March 2024
$962.16
$982.68
$942.14
$957.18
8,523,900
February 2024
$940.39
$992.82
$917.94
$960.76
10,253,800
January 2024
$869.09
$960.33
$866.58
$937.58
11,857,900
December 2023
$820.39
$894.90
$798.12
$873.45
12,741,300