QUANTUM SI INC

Ticker: QSI CUSIP: 74765K105 Class: Common Stock

BlackRock, Inc.'s Holding History (CIK: 0002012383)

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

Q4 2025

Shares 13,054,057 Value ($000) $14,359 Avg Close $1.63 Range $1.07 - $3.10

Q3 2025

Shares 11,321,673 Value ($000) $15,964 Avg Close $1.45 Range $0.95 - $2.18

Q2 2025

Shares 10,848,142 Value ($000) $21,262 Avg Close $1.48 Range $1.02 - $2.15

Q1 2025

Shares 9,440,243 Value ($000) $11,328 Avg Close $1.92 Range $1.12 - $5.77

Q4 2024

Shares 8,437,647 Value ($000) $22,782 Avg Close $1.17 Range $0.61 - $4.14

Q3 2024

Shares 6,900,127 Value ($000) $6,087 Avg Close $0.97 Range $0.79 - $1.26

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	13,054,057	$14,359	$1.63	$1.07 - $3.10
Q3 2025	11,321,673	$15,964	$1.45	$0.95 - $2.18
Q2 2025	10,848,142	$21,262	$1.48	$1.02 - $2.15
Q1 2025	9,440,243	$11,328	$1.92	$1.12 - $5.77
Q4 2024	8,437,647	$22,782	$1.17	$0.61 - $4.14
Q3 2024	6,900,127	$6,087	$0.97	$0.79 - $1.26