$ASPI

$2.02 +$0.07 (3.86%) Close

$ASPI Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 153.3M shares outstanding

Who owns ASPI?

By type of holder

Institutions 42.2% Insiders 10.7% Everyone else 47.1%

Concentration Top 10 holders own 31.3%

Mann Paul Elliot 6.1% · BlackRock, Inc. 6.0%

Institutional ownership

42.2%

+0.6 pts vs last qtr

Institutional holders

184

+7 vs last qtr

Net shares bought

+873.4K

by institutions in Q2 2026

New / sold out

40 / 33

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

BlackRock, Inc. +889.1K
Marshall Wace, LLP NEW +835.7K

Biggest sellers in Q2 2026

Susquehanna International Group, LLP SOLD OUT −1.1M
Jane Street Group, LLC −663.4K

Who is planning to sell?

Notices of proposed sale, last 12 months

$7.86M

21 notices from 8 people

Shares covered

1.4M

0.94% of the company

Arranged in advance

65%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Mann Paul Elliot Director 10b5-1 $3.87M
Todd Wider Director $1.22M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2023–FY2025

+151.0%

+58.45% a year

Each share's claim on the business

−60.2%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $33.3M

over 3 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years0% 1–3 years76% Under 1 year24%

Quarterly turnover

13.3%

of institutional shares changed hands

Top 10 managers, median time held

2 years

Super Investors

Investment managers reporting ASPI on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	9.2M	6.01%	+889.1K (+10.7%)	2023	0.0%
Shares held by quarter Peak holding9.2M (Q2'26) Change over 8 quarters+6.5M Share of the company6.010% BlackRock, Inc.'s full portfolio →
EC Encompass Capital Advisors LLC	6.6M	4.28%	−350.3K (−5.1%)	Q1 '26	1.5%
Shares held by quarter Peak holding6.9M (Q1'26) Change over 8 quarters+6.6M Share of the company4.280% Encompass Capital Advisors LLC's full portfolio →

BlackRock, Inc.

9.2M

% of company

6.01%

Change vs last qtr

+889.1K (+10.7%)

Held since

2023

Encompass Capital Advisors LLC

6.6M

% of company

4.28%

Change vs last qtr

−350.3K (−5.1%)

Held since

Q1 '26

28 more super investors behind a free account

See every manager holding ASP Isotopes Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting ASPI on Form N-PORT; together they hold 12.6% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$22.4M	3.6M	2.34%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$18.9M	3.0M	1.98%	0.02%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$22.4M

% of company

2.34%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$18.9M

% of company

1.98%

% of the fund

0.02%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding ASP Isotopes Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
MP Mann Paul Elliot Insider	9.3M	6.08%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company6.080% Mann Paul Elliot's insider activity →
AR Ainscow Robert Insider	2.2M	1.45%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company1.450% Ainscow Robert's insider activity →

Mann Paul Elliot

Insider

9.3M

% of company

6.08%

Change vs last qtr

—

Held since

—

Ainscow Robert

Insider

2.2M

% of company

1.45%

Change vs last qtr

—

Held since

—

7 more holders behind a free account

See every insider and 5%+ holder of ASP Isotopes Inc..

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