POWER INTEGRATIONS INC

Ticker: POWI CUSIP: 739276103 Class: Common Stock

FRONTIER CAPITAL MANAGEMENT CO LLC's Holding History (CIK: 0000351173)

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

Q2 2015

Shares 168,397 Value ($000) $7,608 Avg Close $22.52 Range $19.63 - $24.33

Q1 2015

Shares 257,647 Value ($000) $13,418 Avg Close $24.21 Range $22.14 - $26.42

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2015	168,397	$7,608	$22.52	$19.63 - $24.33
Q1 2015	257,647	$13,418	$24.21	$22.14 - $26.42