QUANTUM SI INC

Ticker: QSI CUSIP: 74765K105 Class: Common Stock

Nuveen, LLC's Holding History (CIK: 0001871926)

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

Q4 2025

Shares 447,519 Value ($000) $492 Avg Close $1.63 Range $1.07 - $3.10

Q3 2025

Shares 447,519 Value ($000) $631 Avg Close $1.45 Range $0.95 - $2.18

Q2 2025

Shares 1,126,084 Value ($000) $2,207 Avg Close $1.48 Range $1.02 - $2.15

Q1 2025

Shares 319,100 Value ($000) $383 Avg Close $1.92 Range $1.12 - $5.77

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	447,519	$492	$1.63	$1.07 - $3.10
Q3 2025	447,519	$631	$1.45	$0.95 - $2.18
Q2 2025	1,126,084	$2,207	$1.48	$1.02 - $2.15
Q1 2025	319,100	$383	$1.92	$1.12 - $5.77