ATRICURE INC

Ticker: ATRC CUSIP: 04963C209 Class: Common Stock

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC's Holding History (CIK: 0001644956)

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

Q4 2016

Shares 439,054 Value ($000) $8,592 Avg Close $18.12 Range $15.15 - $20.40

Q3 2016

Shares 692,845 Value ($000) $10,961 Avg Close $15.37 Range $13.45 - $17.27

Q2 2016

Shares 408,332 Value ($000) $5,770 Avg Close $15.24 Range $13.44 - $18.03

Q1 2016

Shares 412,038 Value ($000) $6,935 Avg Close $17.59 Range $14.85 - $22.42

Q4 2015

Shares 380,408 Value ($000) $8,536 Avg Close $20.61 Range $17.46 - $23.24

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2016	439,054	$8,592	$18.12	$15.15 - $20.40
Q3 2016	692,845	$10,961	$15.37	$13.45 - $17.27
Q2 2016	408,332	$5,770	$15.24	$13.44 - $18.03
Q1 2016	412,038	$6,935	$17.59	$14.85 - $22.42
Q4 2015	380,408	$8,536	$20.61	$17.46 - $23.24