ASPI
ASP ISOTOPES (ASPI)
NASDAQ
$7.28-$1.05 (-12.64%)
Price as of Jun 03, 2026 5:45 PM EDT
  • $979.5M
    Market Cap
  • 5.04%
    1-Year Change
  • Chemicals
    Industry

Top Holders

Institutional
Mutual Funds
Holder
Ownership %
Shares Held
Change (Shares, %)
Report Date
BLACKROCK, INC.
10.02%
8.3M
+1.5M (+18.48%)
Mar 31, 2026
ENCOMPASS CAPITAL ADVISORS LLC
8.32%
6.9M
+6.9M (+100.00%)
Mar 31, 2026
VANGUARD GROUP INC
7.71%
6.4M
+1.9M (+29.49%)
Dec 31, 2025
N/A
6.09%
5.1M
+5.1M (+100.00%)
Mar 31, 2026
ROVIDA INVESTMENT MANAGEMENT LTD
4.93%
4.1M
0 (0.00%)
Mar 31, 2026
BLACKROCK FUNDING, INC. /DE
4.76%
4.0M
+1.3M (+31.67%)
Dec 31, 2024
SUSQUEHANNA INTERNATIONAL GROUP, LLP
3.59%
3.0M
+854,200 (+28.61%)
Mar 31, 2026

Current Ownership Distribution

  • Institutions293.7M (72.80%)
  • Mutual Funds77.8M (19.27%)
  • Insiders32.0M (7.93%)
  • Other0 (0.00%)

Insider Transactions

  • 7.93% (32.0M)
    Current InsiderOwnership (%, shares)
  • 0
    Number of InsiderBuying (last 12 months)
  • $0.00
    Amount of InsiderBuying (last 12 months)
  • 4
    Number of InsiderSelling (last 12 months)
  • $201.0M
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Ainscow Robert
COO
Sell
Mar 06, 2026
$45,894.28
8,438
$5.44
1.5M
Mann Paul Elliot
Executive Chairman
Sell
Mar 02, 2026
$881,463.71
162,153
$5.44
7.6M
Wider Todd
Award
Dec 18, 2025
$0.00
36,548
$0.00
772,247
Kiessling Heather
Chief Financial Officer
Sell
Dec 18, 2025
$463,840.00
80,000
$5.80
732,500
Hunter Ralph L. JR
Award
Dec 18, 2025
$0.00
36,548
$0.00
47,018
Ryan Robert John Andrew
Award
Dec 18, 2025
$0.00
36,548
$0.00
652,222
Ainscow Robert
Interim CEO and COO
Sell
Nov 25, 2025
$144,225.00
25,000
$5.77
1.6M
Ainscow Robert
Interim CEO and COO
Sell
Nov 17, 2025
$506,722.50
67,500
$7.51
1.6M
Wider Todd
Award
Nov 12, 2025
$0.00
25,469
$0.00
735,699
Gorley Michael
Sell
Sep 30, 2025
$624,236.80
64,000
$9.75
81,360
Mann Paul Elliot
Chief Executive Officer
Exempt
Sep 09, 2025
$432,000.00
216,000
$2.00
7.5M
Mann Paul Elliot
Chief Executive Officer
In Kind
Sep 09, 2025
$431,993.32
50,644
$8.53
7.4M
Mann Paul Elliot
Chief Executive Officer
Exempt
Sep 09, 2025
$2.0M
1.0M
$2.00
8.4M
Mann Paul Elliot
Chief Executive Officer
In Kind
Sep 09, 2025
$2.0M
234,466
$8.53
8.2M
Mann Paul Elliot
Chief Executive Officer
Sell
Sep 09, 2025
$680,122.52
81,077
$8.39
8.1M
Mann Paul Elliot
Chief Executive Officer
Exempt
Sep 09, 2025
$0.00
216,000
$0.00
0
Mann Paul Elliot
Chief Executive Officer
Exempt
Sep 09, 2025
$0.00
1.0M
$0.00
0
Mann Paul Elliot
Chief Executive Officer
Sell
Sep 08, 2025
$691,408.02
81,076
$8.53
7.2M
Hunter Ralph L. JR
Award
Sep 06, 2025
$0.00
10,470
$0.00
10,470
Mann Paul Elliot
Chief Executive Officer
Sell
Apr 17, 2025
$1.8M
316,666
$5.62
7.3M
Ainscow Robert
Chief Operating Officer
Sell
Apr 17, 2025
$374,760.83
66,668
$5.62
1.4M
Mann Paul Elliot
Chief Executive Officer
Sell
Apr 16, 2025
$1.7M
316,667
$5.45
7.6M
Ainscow Robert
Chief Operating Officer
Sell
Apr 16, 2025
$363,023.04
66,666
$5.45
1.5M
Mann Paul Elliot
Chief Executive Officer
Sell
Apr 15, 2025
$1.8M
316,667
$5.75
7.9M
Ainscow Robert
Chief Operating Officer
Sell
Apr 15, 2025
$383,562.83
66,666
$5.75
1.6M
Ainscow Robert
Chief Operating Officer
Award
Apr 14, 2025
$0.00
400,000
$0.00
1.6M
Mann Paul Elliot
Chief Executive Officer
Award
Apr 14, 2025
$0.00
1.4M
$0.00
8.3M
Kiessling Heather
Chief Financial Officer
Award
Apr 14, 2025
$0.00
400,000
$0.00
812,500
Moore Duncan
Award
Dec 09, 2024
$0.00
77,626
$0.00
974,315
Moore Duncan
Award
Dec 09, 2024
$0.00
95,238
$0.00
1.1M