when did regeneron pharmaceuticals go public

Regeneron Pharmaceuticals (REGN) went public on April 2, 1991, when it opened at $21.79.

DATEOPENHIGHLOWCLOSEVOLUME
September 2026
$808.86
$824.63
$804.32
$823.82
673,082
August 2026
$768.64
$847.00
$746.13
$799.08
15,042,229
July 2026
$629.17
$763.86
$623.16
$761.74
17,950,600
June 2026
$606.83
$640.07
$590.83
$622.81
22,932,100
May 2026
$701.15
$728.65
$608.98
$614.06
22,461,300
April 2026
$772.94
$779.14
$667.07
$705.18
15,556,600
March 2026
$769.05
$792.66
$725.95
$770.59
13,279,800
February 2026
$730.10
$811.86
$728.69
$779.59
14,285,700
January 2026
$771.27
$817.95
$715.61
$738.59
18,460,600
December 2025
$772.61
$789.71
$689.19
$768.90
19,232,700
November 2025
$654.11
$787.93
$621.95
$777.18
21,434,600
October 2025
$567.96
$660.61
$538.24
$648.47
25,458,800
September 2025
$577.58
$600.39
$546.40
$559.40
22,624,700
August 2025
$579.16
$607.34
$539.30
$577.74
21,419,400
July 2025
$520.51
$573.91
$517.56
$541.85
19,653,100
June 2025
$487.84
$534.64
$473.34
$521.53
27,780,600
May 2025
$585.01
$613.44
$481.79
$487.04
31,067,600
April 2025
$625.42
$636.06
$521.74
$593.92
25,663,600
March 2025
$696.24
$742.25
$613.52
$629.11
20,912,300
February 2025
$662.55
$733.03
$636.00
$693.10
17,887,000
January 2025
$714.12
$736.33
$660.02
$666.69
17,766,800
December 2024
$743.00
$793.50
$686.52
$705.67
18,051,400
November 2024
$836.71
$853.94
$729.07
$743.21
16,783,800
October 2024
$1,044.21
$1,051.68
$808.36
$830.36
17,457,700
September 2024
$1,167.71
$1,181.39
$998.98
$1,041.41
12,689,200