OMEROS CORP

Ticker: OMER CUSIP: 682143102 Class: COM

RA CAPITAL MANAGEMENT, L.P.'s Holding History (CIK: 0001346824)

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

Q2 2015

Shares 749,000 Value ($000) $13,475 Avg Close $21.58 Range $17.62 - $26.64

Q1 2015

Shares 749,000 Value ($000) $16,500 Avg Close $22.83 Range $18.51 - $27.64

Q3 2013

Shares 1,055,311 Value ($000) $10,289 Avg Close $5.96 Range $4.75 - $10.70

Q2 2013

Shares 2,953,004 Value ($000) $14,883 Avg Close $4.61 Range $3.65 - $5.70

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2015	749,000	$13,475	$21.58	$17.62 - $26.64
Q1 2015	749,000	$16,500	$22.83	$18.51 - $27.64
Q3 2013	1,055,311	$10,289	$5.96	$4.75 - $10.70
Q2 2013	2,953,004	$14,883	$4.61	$3.65 - $5.70