NASDAQ · Health care

ZeroStack Corp. (ZSTK)

ZeroStack Corp. brought in $40M of revenue over the twelve months to June 30, 2026, up 113.8% from a year earlier. It posted a net loss of $177.8M. In fiscal 2025 capital spending exceeded operating cash flow by $8.8M. At June 30, 2026 it held $2.6M in cash against $2.4M of debt. Its latest periodic report to the SEC is the quarterly report (10-Q) filed on July 31, 2026.

Price

$4.07

+2.01% on the day · September 25, 2026

52-week range $1.32 to $22.95

Market cap

$71.2M

Revenue (last 12 months)

$40M

+113.8% year on year

Net margin

-444.2%

What ZeroStack Corp. does

ZeroStack Corp. is registered with the SEC under industry code SIC 6199 (Finance Services). Its shares trade on NASDAQ under the ticker ZSTK.

Revenue and profit by year

Revenue

Net income

Fiscal years as reported in annual reports. Amounts in USD.

Key figures

Fiscal year	Revenue	Operating income	Net income	Diluted EPS	Free cash flow
2025	$35.7M	-$154.7M	-$119.7M	-$43.49	-$8.8M
2024	$35.9M	-$8.9M	-$15.9M	-$50.02	-$5.2M
2023	$76.1M	-$50.4M	-$57M	-$298.20	-$8.6M
2022	$33.4M	-$47.2M	-$52.4M	-$526.36	-$17.2M
2021	$9M	-$19M	-$21.4M	-$18.47	-$24.9M
2021	$106K	n/a	-$14.3M	-$18.08	-$8.4M

Full financial statements: income, balance sheet and cash flow

Next report expected around October 16, 2026.

Estimated from its filing rhythm: about 77 days after its last report of July 31, 2026, its usual gap. Not a date the company has announced. See the report calendar

Where ZSTK ranks in Health care

Revenue$35.7M

#402 of 646 in Health care · Bottom 38%

Revenue growth-0.5%

#373 of 474 in Health care · Bottom 21%

Net margin-335.6%

#446 of 485 in Health care · Bottom 8%

Free cash flow margin-24.7%

#300 of 440 in Health care · Bottom 32%

Latest fiscal year of every company in the sector with the figure reported. Revenue is ranked among companies reporting in US dollars; growth and margins among companies with at least 10 million of revenue. Health care

Latest SEC filings

What ZeroStack Corp. has filed recently, newest first. Each links to the original document on SEC EDGAR.

September 4, 2026
Form POS AM filing POS AM
September 4, 2026
Form AW filing AW
September 4, 2026
Passive stake (5% or more) SCHEDULE 13G
September 2, 2026
Passive stake (5% or more) SCHEDULE 13G
August 28, 2026
Form POS AM filing POS AM
August 28, 2026
Form POS AM filing POS AM
August 28, 2026
Form POS AM filing POS AM
August 28, 2026
Form POS AM filing POS AM
August 26, 2026
Shelf registration to sell securities S-3
August 26, 2026
Employee stock plan registration S-8

Recent insider filings (Forms 3, 4 and 144): 10, the latest on August 21, 2026. Insider transactions on SEC

Insider trades

What the people running ZeroStack Corp. did with its shares, from the Form 4 filings they must send the SEC within two business days.

Insiders bought $3.5M and sold $7.6K worth of shares in the last 90 days.

Bought (open market)

$3.5M

last 90 days

Sold

$7.6K

last 90 days

Net bought

4,607,575

$3.5M

Date	Insider	What	Shares	Price	Value	Filing
August 19, 2026	Rong RudyPresident	Sold	1,000	$7.57	$7.6K	Form 4
July 20, 2026	Reis-Faria DanielCEO, Director	Exercised options	5,954,743	$0.00	$595.5	Form 4
July 20, 2026	Heinrich MichaelExecutive Chairman, Director	Boughtindirect	4,608,575	$0.75	$3.5M	Form 4

All insider filings on SEC.gov · Where insiders are buying across the market

Who owns ZSTK

Three views from three kinds of SEC filings, each with its own date. They overlap and are not added up.

5% holders

Anyone who owns more than 5% of a class of shares must say so on Schedule 13D (if they may seek to influence the company) or 13G (a passive holder). The latest filing of each holder is shown: 13G filings of the last 2 years, 13D of the last 3.

Holder	Of class	Shares	Filed
Reis-Faria Daniel13D, may seek influence	37.5%	6,925,951	July 21, 2026
Heinrich Michael13D, may seek influence with 1 related filers	30.2%	5,579,783	July 21, 2026
Starke Clifford13D, may seek influence	17.1%	3,850,886	July 21, 2025
Blockcat Pte. Ltd.13G, passive	8.3%	1,750,000	September 4, 2026
Puple AI Inc.13G, passive	8.3%	1,750,000	September 2, 2026

Latest filings below 5%: Vaiman Dany 2.9% (July 21, 2026); Highbridge Capital Management, LLC 4.4% (August 14, 2025); Empery Asset Management, LP 1.92% (April 29, 2025).

Largest institutional holders

No Form 13F positions imported for this company yet.

Insiders

Reported holdings of insiders who filed a Form 4 in the last 12 months: the shares each one held after their latest reported transaction. This is not the total held by all insiders.

2 insiders reported holding 10,563,318 shares in total, about $43M at the last price.

Holder	Shares	As of
Reis-Faria DanielCEO, Director	5,954,743	July 20, 2026
Heinrich MichaelExecutive Chairman, Director	4,608,5754,608,575 held indirectly	July 20, 2026

Schedule 13D/13G filings on SEC.gov

All filings on SEC EDGAR

Questions about ZSTK

What does ZeroStack Corp. do?

ZeroStack Corp. is registered with the SEC under industry code SIC 6199 (Finance Services). Its shares trade on NASDAQ under the ticker ZSTK.

Is ZeroStack Corp. profitable?

No. Over the twelve months to June 30, 2026 it reported a net loss of $177.8M on revenue of $40M.

How much revenue does ZeroStack Corp. make?

Over the twelve months to June 30, 2026 ZeroStack Corp. reported revenue of $40M. That is 113.8% more than a year earlier.

When did ZeroStack Corp. last report?

Its most recent periodic report is the quarterly report (10-Q) filed on July 31, 2026. It covers the period to June 30, 2026. Its newest filing of any kind is the form POS AM filing from September 4, 2026.

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Where the numbers come from

Financial figures are the values ZeroStack Corp. tagged in its own SEC filings (XBRL), taken from the latest filing for each period, so restatements replace older figures. Revenue, profit and cash flow are for full fiscal years unless marked as the last twelve months, which is the sum of the four most recent quarters. Where a company reports only the full year, the fourth quarter is the year minus the first three.

Prices are delayed end-of-day market data in the listing currency, and market cap moves with the price. P/E is shown only when earnings per share are positive. Nothing here is investment advice.