QUANTUM SI INC

Ticker: QSI CUSIP: 74765K105 Class: Common Stock

DEERFIELD MANAGEMENT COMPANY, L.P.'s Holding History (CIK: 0001009258)

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

Q2 2023

Shares 797,500 Value ($000) $1,428 Avg Close $1.57 Range $1.36 - $1.94

Q3 2022

Shares 1,400,000 Value ($000) $3,850 Avg Close $3.20 Range $2.31 - $4.43

Q2 2022

Shares 1,400,000 Value ($000) $3,248 Avg Close $3.83 Range $2.22 - $4.97

Q1 2022

Shares 1,400,000 Value ($000) $6,552 Avg Close $4.87 Range $3.72 - $8.30

Q4 2021

Shares 1,400,000 Value ($000) $11,018 Avg Close $7.53 Range $5.33 - $9.10

Q3 2021

Shares 1,400,000 Value ($000) $11,676 Avg Close $9.85 Range $7.43 - $14.17

Q2 2021

Shares 1,400,000 Value ($000) $17,164 Avg Close $10.48 Range $7.85 - $13.23

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2023	797,500	$1,428	$1.57	$1.36 - $1.94
Q3 2022	1,400,000	$3,850	$3.20	$2.31 - $4.43
Q2 2022	1,400,000	$3,248	$3.83	$2.22 - $4.97
Q1 2022	1,400,000	$6,552	$4.87	$3.72 - $8.30
Q4 2021	1,400,000	$11,018	$7.53	$5.33 - $9.10
Q3 2021	1,400,000	$11,676	$9.85	$7.43 - $14.17
Q2 2021	1,400,000	$17,164	$10.48	$7.85 - $13.23