SPERO THERAPEUTICS INC

Ticker: SPRO CUSIP: 84833T103 Class: COM

CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM's Holding History (CIK: 0000919079)

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

Q1 2021

Shares 30,600 Value ($000) $450 Avg Close $17.60 Range $12.70 - $22.23

Q4 2020

Shares 30,600 Value ($000) $593 Avg Close $15.59 Range $11.03 - $23.64

Q3 2020

Shares 33,294 Value ($000) $372 Avg Close $11.83 Range $8.50 - $14.37

Q2 2020

Shares 29,100 Value ($000) $394 Avg Close $11.23 Range $6.88 - $14.48

Q1 2018

Shares 25,000 Value ($000) $356 Avg Close $12.13 Range $9.66 - $14.61

Q4 2017

Shares 25,000 Value ($000) $294 Avg Close $12.27 Range $9.85 - $15.40

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2021	30,600	$450	$17.60	$12.70 - $22.23
Q4 2020	30,600	$593	$15.59	$11.03 - $23.64
Q3 2020	33,294	$372	$11.83	$8.50 - $14.37
Q2 2020	29,100	$394	$11.23	$6.88 - $14.48
Q1 2018	25,000	$356	$12.13	$9.66 - $14.61
Q4 2017	25,000	$294	$12.27	$9.85 - $15.40