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8-K filings in May 2026, explained

1,796 material Form 8-K filings that 1,448 companies we cover made with the SEC in May 2026, each read and summarized by AI: what happened, the key figures, whether it reads positive or negative for shareholders, and how big a deal it is (impact 1-5). All of them were written later, when past filings were added: a selection, not every 8-K of the month (see the note below).

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HTFLHeartflow, Inc. May 14, 4:03 PM ET

Heartflow raises 2026 revenue guidance; Q1 revenue rose 41% to $52.6 million

Positive guidance Written later 2.02

Heartflow reported first quarter 2026 revenue of $52.6 million, up 41% year over year, and a net loss of $27.4 million, or $0.32 per share, versus $32.3 million, or $5.25 per share, a year earlier. The company raised its full-year 2026 revenue guidance to $228 million to $232 million from $218 million to $222 million, though GAAP results include a $7.5 million non-cash impairment charge tied to facilities changes.

Q1 2026 total revenue was $52.6 million, up from $37.2 million; U.S. revenue was $48.3 million.
Gross margin was 80.2%, compared with 75.1% a year earlier.
Net loss was $27.4 million, including a $7.5 million non-cash impairment charge from a headquarters relocation to San Francisco.
2026 revenue guidance raised to $228 million to $232 million; cash, cash equivalents and investments were $254.9 million at March 31, 2026.

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Briefs are written by AI from the filing text and can contain mistakes — open the filing before acting on anything. Impact (1-5) and tone are the AI's reading of the filing for shareholders, not a price forecast. Not investment advice.

Briefs marked “Written later” were written in November 2026 for filings that were by then more than three weeks old, so months before mid-October 2026 hold a selection: every material 8-K of the past year for the 100 largest companies we cover and the last 15 important 8-Ks of every other one. Briefs the number check holds back are not shown or counted. Also: the last 45 days, briefs by company, A–Z and the live SEC filings wire.