FIRST INTST BANCSYSTEM INC

Ticker: FIBK CUSIP: 32055Y201 Class: Common Stock

WESTFIELD CAPITAL MANAGEMENT CO LP's Holding History (CIK: 0001177719)

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

Q4 2022

Shares 1,033,974 Value ($000) $39,963 Avg Close $34.12 Range $30.24 - $37.52

Q3 2022

Shares 686,944 Value ($000) $27,718 Avg Close $32.17 Range $29.33 - $35.35

Q2 2022

Shares 666,268 Value ($000) $25,391 Avg Close $28.16 Range $25.41 - $31.07

Q1 2022

Shares 20,410 Value ($000) $750 Avg Close $30.77 Range $27.94 - $35.17

Q4 2021

Shares 15,620 Value ($000) $635 Avg Close $32.08 Range $29.12 - $35.07

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2022	1,033,974	$39,963	$34.12	$30.24 - $37.52
Q3 2022	686,944	$27,718	$32.17	$29.33 - $35.35
Q2 2022	666,268	$25,391	$28.16	$25.41 - $31.07
Q1 2022	20,410	$750	$30.77	$27.94 - $35.17
Q4 2021	15,620	$635	$32.08	$29.12 - $35.07