DH SCHEDULE 13D/A: Activist campaign
Advent International, L.P.
Filed with the SEC on · accession 0001140361-26-038313
DH filed a SCHEDULE 13D/A (schedule 13d/a) with the SEC on Oct 1, 2026. Advent International, L.P. entered into a confidentiality agreement with Definitive Healthcare Corp. on September 29, 2026, to facilitate consideration and negotiation of a possible negotiated transaction. The stock moved +3.4% by the first close after the filing.
Summary of the filing
Advent International, L.P. entered into a confidentiality agreement with Definitive Healthcare Corp. on September 29, 2026, to facilitate consideration and negotiation of a possible negotiated transaction. The agreement restricts Advent's use and disclosure of non-public company information and governs contact with company representatives.
Key details
How DH stock reacted
Close before
$0.91
Sep 30, 2026
First close after
+3.44%
$0.94
5 trading days
+7.22%
$0.97
Since filing
+24.86%
$1.13
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Click hereFrequently asked questions
What did DH file with the SEC on Oct 1, 2026?
DH filed a SCHEDULE 13D/A (Activist campaign). Advent International, L.P. entered into a confidentiality agreement with Definitive Healthcare Corp. on September 29, 2026, to facilitate consideration and negotiation of a possible negotiated transaction. The agreement restricts Advent's use and disclosure of non-public company information and governs contact with company representatives.
What does a activist campaign mean for DH stock?
A settlement removes uncertainty; the stock often reacts to whether the amount is bigger or smaller than investors expected.
How do I read a SCHEDULE 13D/A?
A report the company filed with the SEC (the US market regulator). Start with the summary, then the key amounts and names. Compare it with the company’s earlier filings.
Why are SEC filings important?
Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A SCHEDULE 13D/A (schedule 13d/a): A report the company filed with the SEC (the US market regulator).
How did DH stock react to this filing?
DH closed at $0.91 before the filing and $0.94 on Oct 1, 2026 (+3.44%). Five trading days later: $0.97 (+7.22%).
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