QUANTUM SI INC

Ticker: QSI CUSIP: 74765K105 Class: Common Stock

ROTHSCHILD INVESTMENT LLC's Holding History (CIK: 0000085338)

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

Q4 2025

Shares 70 Value ($000) $0 Avg Close $1.63 Range $1.07 - $3.10

Q2 2024

Shares 75 Value ($000) $0 Avg Close $1.60 Range $0.73 - $1.99

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	70	$0	$1.63	$1.07 - $3.10
Q2 2024	75	$0	$1.60	$0.73 - $1.99