DEFINITIVE HEALTHCARE CORP

Ticker: DH CUSIP: 24477E103 Class: Common Stock

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025
Shares 1,387 Value ($000) $4 Avg Close $2.77 Range $2.23 - $4.02
Q3 2025
Shares 1,387 Value ($000) $6 Avg Close $3.99 Range $3.44 - $4.70