ZeroStack Corp. (ZSTK) Insider Trading

Last 12 months

Insiders bought $3.46M and sold $8k on the open market.

None of the selling was scheduled in advance under a 10b5-1 plan. President Rudy Rong sold $8k on Aug 19, 100% of their stake, outside a plan.

Net open-market

+$3.45M

1 buy · 1 sale

Under a 10b5-1 plan

of the value sold

Insiders who bought / sold

1 / 1

executives and directors

Last open-market buy

Jul 2026

Jul 20, 2026

Get an email when ZSTK's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Aug 19	Rudy Rong President	SoldNo plan	1,000	$7.57	$8k	100%	Form 4
Jul 20	Michael Heinrich Executive Chairman	Bought	4,608,575	$0.75	$3.46M	New	Form 4

Aug 19No plan
Rudy Rong
President · sold 1,000 at $7.57
$8k
100% of stake
Jul 20
Michael Heinrich
Executive Chairman · bought 4,608,575 at $0.75
$3.46M
New position

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch ZSTK, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

Related stocks: Wholesale-Drugs, Proprietaries & Druggists' Sundries

WGRXWellgistics Health Inc.

COSMCosmos Health Inc.

NHTCNatural Health Trends Corp.

IVFHInnovative Food Holdings Inc.

EDUCEducational Development Corporation

BHATFBlue Hat Interactive Entertainment Technology

WTERThe Alkaline Water Company Inc.

RAVERave Restaurant Group Inc.

Spot a number that looks wrong? Check it in ZSTK's SEC filings or

Download this analysis as a PDF (Pro)

Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

2 of 2 free stocks used today

Keep analysing ZSTK

Create a free account and get 14 days of Premium: every stock and every tool.

Unlimited stocksQuality, fair value and dividends for 10,000+ stocks
Stock screenerFilter on quality, valuation and dividend safety
Portfolio trackerReal return, dividend calendar and portfolio quality
Editable DCFChange the assumptions and watch fair value move
Compare side by sideUp to 10 stocks in one table
Unlimited alertsPrice, P/E, Quality Score and yield

No card. Moves to Free after, unless you upgrade.

Already have an account?

Or come back tomorrow. Stocks on your watchlist are always free to view.