QUANTUM SI INC

Ticker: QSI CUSIP: 74765K105 Class: Common Stock

Optiver Holding B.V.'s Holding History (CIK: 0001859606)

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

Q4 2025

Shares 927 Value ($000) $1 Avg Close $1.63 Range $1.07 - $3.10

Q3 2025

Shares 1,118 Value ($000) $2 Avg Close $1.45 Range $0.95 - $2.18

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	927	$1	$1.63	$1.07 - $3.10
Q3 2025	1,118	$2	$1.45	$0.95 - $2.18