Executive Chair Michael Heinrich buys $3.5 million of ZeroStack Corp. (ZSTK)

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Form 4

The form a company insider (officer, director or owner of more than 10%) must file with the SEC within two business days of buying or selling the company's shares.

13F

A quarterly list of U.S. stocks held by an investment manager with more than $100 million, filed within 45 days after each quarter ends.

STOCK Act

A 2012 law that requires members of Congress to report stock trades by themselves, a spouse or a dependent child within 45 days.

A real example

In January 2016, when bank stocks were falling, JPMorgan Chase CEO Jamie Dimon bought 500,000 JPMorgan shares with his own money, worth about $26 million. His Form 4 made the purchase public within days, and investors read it as a strong sign of confidence.

Explain it like I'm 13

We read the long, boring forms that grown-ups file with the government and tell you what they say in normal words.

Data from public SEC filings and congressional reports. Information, not investment advice. Check every number against the filing linked on the page.

Executive Chair Michael Heinrich buys $3.5 million of ZeroStack Corp. (ZSTK)

Michael Heinrich, executive chair, bought $3.5 million of stock after a 76.2% fall. WallStPal Score 62.

WallStPal ScoreHow much this purchase says, from 0 to 100. How it works

Michael Heinrich, executive chair of ZeroStack Corp., bought 4,608,575 shares on the open market on July 20, 2026 at an average of $0.75 a share, for a total of $3.5 million. The purchase was reported to the SEC on Form 4 on July 20, 2026.

It is a new position: the filing shows no shares held directly before this purchase.

The purchase came after a fall: ZeroStack Corp. stock was down 76.2% over the 13 weeks before.

In the 12 months up to this filing, ZeroStack Corp. insiders reported 1 open-market purchase and 0 sales.

WallStPal Score: 62 out of 100, because of a brand-new position; a large purchase; the stock had fallen 76.2% in the 13 weeks before.

It is too soon to say how the stock did afterward. This page will update as prices come in.

Source: SEC Form 4 filing ↗. This story was written automatically from the filing and weekly price data. Information, not investment advice.

Examples

Big insider purchases have made news before. In January 2016, with bank stocks falling, JPMorgan Chase CEO Jamie Dimon bought 500,000 JPMorgan shares, about $26 million of his own money, and the purchase was widely reported as a sign of confidence.

Explain it like I'm 13

Michael Heinrich helps run ZeroStack Corp.. Spending $3.5 million of their own money on the company's stock is like a coach buying a big stack of tickets to their own team's games: it suggests they think the team will do well. It is not a promise, and insiders can be wrong.

More: all ZSTK insider trades · Michael Heinrich's track record