ASPI
ASP ISOTOPES (ASPI)
NASDAQ
$4.75+$0.16 (+3.40%)
Price as of Jul 14, 2026 5:02 AM EDT
  • $630.8M
    Market Cap
  • -42.70%
    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

  • Institutions294.3M (71.25%)
  • Mutual Funds82.9M (20.06%)
  • Insiders35.9M (8.69%)
  • Other0 (0.00%)

Insider Transactions

  • 8.69% (35.9M)
    Current InsiderOwnership (%, shares)
  • 0
    Number of InsiderBuying (last 12 months)
  • $0.00
    Amount of InsiderBuying (last 12 months)
  • 3
    Number of InsiderSelling (last 12 months)
  • $29.6M
    Amount of InsiderSelling (last 12 months)
Insider Name & Title
Type
Date
Transaction Value
Shares
Share Price
Shares After Transactions
Kiessling Heather
Chief Financial Officer
Sell
Jul 01, 2026
$145,218.72
23,124
$6.28
1.5M
Ainscow Donald George
EVP, Gen Counsel, Secretary
Sell
Jun 30, 2026
$614,000.00
100,000
$6.14
800,000
Ainscow Robert
COO
Sell
Jun 08, 2026
$59,057.56
8,438
$7.00
2.3M