QUANTUM SI INC

Ticker: QSI CUSIP: 74765K105 Class: Common Stock

SBI Securities Co., Ltd.'s Holding History (CIK: 0001851815)

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

Q4 2025

Shares 34,163 Value ($000) $38 Avg Close $1.63 Range $1.07 - $3.10

Q3 2025

Shares 33,616 Value ($000) $47 Avg Close $1.45 Range $0.95 - $2.18

Q2 2025

Shares 26,141 Value ($000) $51 Avg Close $1.48 Range $1.02 - $2.15

Q1 2025

Shares 18,970 Value ($000) $23 Avg Close $1.92 Range $1.12 - $5.77

Q4 2024

Shares 22,261 Value ($000) $60 Avg Close $1.17 Range $0.61 - $4.14

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	34,163	$38	$1.63	$1.07 - $3.10
Q3 2025	33,616	$47	$1.45	$0.95 - $2.18
Q2 2025	26,141	$51	$1.48	$1.02 - $2.15
Q1 2025	18,970	$23	$1.92	$1.12 - $5.77
Q4 2024	22,261	$60	$1.17	$0.61 - $4.14