POWER SOLUTIONS INTL INC

Ticker: PSIX CUSIP: 73933G202 Class: Common Stock

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

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

Q4 2015

Shares 459,972 Value ($000) $8,394 Avg Close $21.57 Range $16.75 - $28.92

Q3 2015

Shares 557,937 Value ($000) $12,671 Avg Close $36.50 Range $22.09 - $54.44

Q2 2015

Shares 478,524 Value ($000) $25,850 Avg Close $58.85 Range $49.28 - $69.79

Q1 2015

Shares 484,443 Value ($000) $31,145 Avg Close $52.16 Range $40.83 - $66.61

Q4 2014

Shares 443,424 Value ($000) $22,885 Avg Close $59.33 Range $43.74 - $74.57

Q3 2014

Shares 279,904 Value ($000) $19,313 Avg Close $67.67 Range $58.03 - $79.50

Q2 2014

Shares 254,589 Value ($000) $18,323 Avg Close $76.82 Range $66.03 - $88.96

Q1 2014

Shares 175,947 Value ($000) $13,226 Avg Close $72.19 Range $56.53 - $87.40

Q4 2013

Shares 67,470 Value ($000) $5,067 Avg Close $65.56 Range $52.30 - $78.96

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2015	459,972	$8,394	$21.57	$16.75 - $28.92
Q3 2015	557,937	$12,671	$36.50	$22.09 - $54.44
Q2 2015	478,524	$25,850	$58.85	$49.28 - $69.79
Q1 2015	484,443	$31,145	$52.16	$40.83 - $66.61
Q4 2014	443,424	$22,885	$59.33	$43.74 - $74.57
Q3 2014	279,904	$19,313	$67.67	$58.03 - $79.50
Q2 2014	254,589	$18,323	$76.82	$66.03 - $88.96
Q1 2014	175,947	$13,226	$72.19	$56.53 - $87.40
Q4 2013	67,470	$5,067	$65.56	$52.30 - $78.96