QUANTUM SI INC

Ticker: QSI CUSIP: 74765K105 Class: Common Stock

Capital International Investors's Holding History (CIK: 0001562230)

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

Q4 2021

Shares 2,500,000 Value ($000) $19,675 Avg Close $7.53 Range $5.33 - $9.10

Q3 2021

Shares 2,500,000 Value ($000) $20,850 Avg Close $9.85 Range $7.43 - $14.17

Q2 2021

Shares 2,500,000 Value ($000) $26,972 Avg Close $10.48 Range $7.85 - $13.23

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2021	2,500,000	$19,675	$7.53	$5.33 - $9.10
Q3 2021	2,500,000	$20,850	$9.85	$7.43 - $14.17
Q2 2021	2,500,000	$26,972	$10.48	$7.85 - $13.23