SIMULATIONS PLUS INC

Ticker: SLP CUSIP: 829214105 Class: Common Stock

ESSEX INVESTMENT MANAGEMENT CO LLC's Holding History (CIK: 0000201772)

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

Q1 2015

Shares 10,043 Value ($000) $62 Avg Close $5.70 Range $5.23 - $6.18

Q4 2014

Shares 11,584 Value ($000) $77 Avg Close $5.66 Range $4.95 - $6.32

Q3 2014

Shares 12,993 Value ($000) $90 Avg Close $5.62 Range $4.79 - $6.23

Q2 2014

Shares 10,780 Value ($000) $61 Avg Close $5.25 Range $4.62 - $5.97

Q1 2014

Shares 10,780 Value ($000) $72 Avg Close $4.96 Range $4.18 - $6.17

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2015	10,043	$62	$5.70	$5.23 - $6.18
Q4 2014	11,584	$77	$5.66	$4.95 - $6.32
Q3 2014	12,993	$90	$5.62	$4.79 - $6.23
Q2 2014	10,780	$61	$5.25	$4.62 - $5.97
Q1 2014	10,780	$72	$4.96	$4.18 - $6.17