$ZSTK

$3.13 -$0.15 (4.57%) Close

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

Ownership

13F as of Q2 2026 · 17.5M shares outstanding

Who owns ZSTK?

By type of holder

Institutions 0.4% Insiders 13.0% Everyone else 86.6%

Concentration Top 10 holders own 98.4%

Reis-Faria Daniel 39.6% · Heinrich Michael 31.9%

Institutional ownership

0.4%

-0.0 pts vs last qtr

Institutional holders

+1 vs last qtr

Net shares bought

−3.0K

by institutions in Q2 2026

New / sold out

3 / 2

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Tower Research Capital LLC (TRC) NEW +1.7K
Barclays PLC NEW +3

Biggest sellers in Q2 2026

Geode Capital Management, LLC −4.3K
UBS Group AG −226

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for ZeroStack Corp in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2024–FY2025

+765.7%

+765.72% a year

Each share's claim on the business

−88.4%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $3.99M

over 2 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 years0% Under 1 year100%

Quarterly turnover

5.0%

of institutional shares changed hands

Top 10 managers, median time held

1 quarter

Super Investors

Investment managers reporting ZSTK on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
VC Vanguard Capital Management LLC	25.4K	0.15%	Unchanged	Q1 '26	0.0%
Shares held by quarter Peak holding25.4K (Q1'26) Change over 8 quarters+25.4K Share of the company0.150% Vanguard Capital Management LLC's full portfolio →
GC Geode Capital Management, LLC	21.0K	0.12%	−4.3K (−17.1%)	Q1 '26	0.0%
Shares held by quarter Peak holding168.6K (Q2'25) Change over 8 quarters−85.2K Share of the company0.120% Geode Capital Management, LLC's full portfolio →

Vanguard Capital Management LLC

25.4K

% of company

0.15%

Change vs last qtr

Unchanged

Held since

Q1 '26

Geode Capital Management, LLC

21.0K

% of company

0.12%

Change vs last qtr

−4.3K (−17.1%)

Held since

Q1 '26

11 more super investors behind a free account

See every manager holding ZeroStack Corp, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting ZSTK on Form N-PORT; together they hold 0.2% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VE Vanguard Extended Market Index Fund Vanguard Index Funds	$76.3K	25.4K	0.15%	0.00%	June 30, 2026
FE Fidelity Extended Market Index Fund Fidelity Concord Street Trust	$70K	13.3K	0.08%	0.00%	August 31, 2026

Vanguard Extended Market Index Fund

Vanguard Index Funds

Position value

$76.3K

% of company

0.15%

% of the fund

0.00%

As of

June 30, 2026

Fidelity Extended Market Index Fund

Fidelity Concord Street Trust

Position value

$70K

% of company

0.08%

% of the fund

0.00%

As of

August 31, 2026

4 more funds behind a free account

See every fund holding ZeroStack Corp 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
RD Reis-Faria Daniel 5%+ holder 13D · 37.5%	6.9M	39.60%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company39.600% Disclosed stake13D · 37.5% View the 13D/G filing →
HM Heinrich Michael 5%+ holder 13D · 30.2%	5.6M	31.90%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company31.900% Disclosed stake13D · 30.2% View the 13D/G filing →

Reis-Faria Daniel

5%+ holder13D · 37.5%

6.9M

% of company

39.60%

Change vs last qtr

—

Held since

—

Heinrich Michael

5%+ holder13D · 30.2%

5.6M

% of company

31.90%

Change vs last qtr

—

Held since

—

4 more holders behind a free account

See every insider and 5%+ holder of ZeroStack Corp.

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