Definitive Healthcare Corp
Ownership
Ownership Structure
Who owns Definitive Healthcare Corp (DH)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 38.1% of the shares are freely tradable; institutional investors hold 83.0%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Advent International LP | 58.45 | 62,493,676 | +0.0 | 06/30/2026 |
| The Goldman Sachs Group Inc | 5.57 | 5,959,143 | -1.4 | 06/30/2026 |
| D. E. Shaw & Co LP | 1.85 | 1,973,193 | -6.0 | 06/30/2026 |
| Vanguard Capital Management, LLC | 1.71 | 1,829,463 | -2.0 | 06/30/2026 |
| Kennedy Capital Management Inc | 1.62 | 1,737,044 | +0.0 | 06/30/2026 |
| BlackRock Inc | 1.32 | 1,408,621 | -52.8 | 06/30/2026 |
| Dimensional Fund Advisors, Inc. | 1.31 | 1,398,011 | -3.8 | 09/30/2026 |
| AQR Capital Management LLC | 0.84 | 899,132 | +28.1 | 06/30/2026 |
| CWM Advisors, LLC | 0.84 | 894,949 | +91.2 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 1.24 | 1,327,702 | +0.0 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Ritchey Clay Brian | Chief Executive Officer | 2,626,263 | 3,414,142 $ | Oct 23, 2026 | direct |
| Heller Casey | Chief Financial Officer | 1,784,079 | 2,319,303 $ | Nov 1, 2026 | direct |
| Krantz Jason Ronald | Director | 1,177,106 | 1,530,238 $ | Nov 1, 2026 | direct |
| Paris Jonathan | Chief Legal Officer | 864,534 | 1,123,894 $ | Oct 1, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Nov 1, 2026 | Krantz Jason Ronald | Director | Other | 12,166 | 1.12 | 13,626 |
| Nov 1, 2026 | Heller Casey | Chief Financial Officer | Other | 1,881 | 1.12 | 2,107 |
| Oct 23, 2026 | Ritchey Clay Brian | Chief Executive Officer | Other | 2,626,263 | 0.00 | – |
| Oct 1, 2026 | Heller Casey | Chief Financial Officer | Other | 12,542 | 0.9361 | 11,741 |
| Oct 1, 2026 | Paris Jonathan | Chief Legal Officer | Other | 7,729 | 0.9361 | 7,235 |
| Sep 1, 2026 | Heller Casey | Chief Financial Officer | Other | 41,093 | 0.9023 | 37,078 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 13, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.