MERSANA THERAPEUTICS INC

CUSIP: 59045L106 Class: COM

BROWN BROTHERS HARRIMAN & CO's Holding History (CIK: 0000014661)

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

Q1 2018
Shares 1,144 Value ($000) $18 Avg Close — Range —
Q4 2017
Shares 1,144 Value ($000) $19 Avg Close — Range —