SIGMA ALDRICH CORP

CUSIP: 826552101 Class: COM

WATER ISLAND CAPITAL LLC's Holding History (CIK: 0001222765)

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

Q3 2015
Shares 733,742 Value ($000) $101,931 Avg Close — Range —
Q2 2015
Shares 691,836 Value ($000) $96,407,347 Avg Close — Range —
Q1 2015
Shares 525,510 Value ($000) $72,651,758 Avg Close — Range —
Q4 2014
Shares 330,812 Value ($000) $45,410,563 Avg Close — Range —
Q3 2014
Shares 309,446 Value ($000) $42,087,750 Avg Close — Range —