QUANTUM SI INC

Ticker: QSI CUSIP: 74765K105 Class: Common Stock

MARSHALL WACE, LLP's Holding History (CIK: 0001318757)

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

Q4 2021

Shares 77,816 Value ($000) $612 Avg Close $7.53 Range $5.33 - $9.10

Q2 2021

Shares 61,655 Value ($000) $756 Avg Close $10.48 Range $7.85 - $13.23

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2021	77,816	$612	$7.53	$5.33 - $9.10
Q2 2021	61,655	$756	$10.48	$7.85 - $13.23