AFFILIATED MANAGERS GROUP

Ticker: AMG CUSIP: 008252108 Class: COM

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

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

Q1 2017

Shares 137,838 Value ($000) $22,597 Avg Close $153.31 Range $135.07 - $166.39

Q4 2016

Shares 5,310 Value ($000) $772 Avg Close $140.58 Range $126.32 - $157.66

Q3 2016

Shares 414,741 Value ($000) $60,013 Avg Close $138.59 Range $126.84 - $143.96

Q2 2016

Shares 421,088 Value ($000) $59,277 Avg Close $158.47 Range $126.98 - $174.12

Q1 2016

Shares 418,483 Value ($000) $67,962 Avg Close $135.06 Range $112.27 - $159.84

Q4 2015

Shares 151,563 Value ($000) $24,214 Avg Close $166.43 Range $137.16 - $184.66

Q3 2015

Shares 154,367 Value ($000) $26,395 Avg Close $190.37 Range $159.30 - $214.73

Q2 2015

Shares 149,393 Value ($000) $32,657 Avg Close $215.27 Range $205.22 - $223.28

Q1 2015

Shares 159,343 Value ($000) $34,224 Avg Close $204.27 Range $185.26 - $214.40

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2017	137,838	$22,597	$153.31	$135.07 - $166.39
Q4 2016	5,310	$772	$140.58	$126.32 - $157.66
Q3 2016	414,741	$60,013	$138.59	$126.84 - $143.96
Q2 2016	421,088	$59,277	$158.47	$126.98 - $174.12
Q1 2016	418,483	$67,962	$135.06	$112.27 - $159.84
Q4 2015	151,563	$24,214	$166.43	$137.16 - $184.66
Q3 2015	154,367	$26,395	$190.37	$159.30 - $214.73
Q2 2015	149,393	$32,657	$215.27	$205.22 - $223.28
Q1 2015	159,343	$34,224	$204.27	$185.26 - $214.40