QUANTUM SI INC

Ticker: QSI CUSIP: 74765K105 Class: Common Stock

Atom Investors LP's Holding History (CIK: 0001738902)

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

Q4 2025

Shares 21,995 Value ($000) $24 Avg Close $1.63 Range $1.07 - $3.10

Q2 2025

Shares 20,803 Value ($000) $41 Avg Close $1.48 Range $1.02 - $2.15

Q1 2025

Shares 30,172 Value ($000) $36 Avg Close $1.92 Range $1.12 - $5.77

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	21,995	$24	$1.63	$1.07 - $3.10
Q2 2025	20,803	$41	$1.48	$1.02 - $2.15
Q1 2025	30,172	$36	$1.92	$1.12 - $5.77