Atika Capital Management’s Summit Materials, Inc. Class A Common Stock SUM Stock Holding History

Atika Capital Management’s Portfolio SUM Stock Details SUM Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2017 Q4	–	Sell	-76,827	Closed	-$2.39M	–	79
2017 Q3	$2.39M	Sell	76,827 -41,765	-35%	-$1.19M	0.69%	57
2017 Q2	$3.32M	Hold	118,592	–	–	1.16%	29
2017 Q1	$2.84M	Sell	118,592 -84,788	-42%	-$1.99M	1.39%	31
2016 Q4	$4.69M	Buy	+203,380	New	+$4.27M	2.79%	12
2016 Q1	–	Sell	-134,077	Closed	-$2.57M	–	65
2015 Q4	$2.57M	Sell	134,077 -35,406	-21%	-$722K	1.32%	31
2015 Q3	$3M	Buy	169,483 +104,868	+162%	+$2.42M	1.47%	22
2015 Q2	$1.55M	Buy	+64,615	New	+$1.53M	0.7%	49

Other funds holding SUM

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Jennison Associates New York $167B AUM 44.17% 1-Year Est. Return

Janus Henderson Group London $209B AUM 37.72% 1-Year Est. Return

TBC

Three Bays Capital Boston, Massachusetts $848M AUM 7.41% 1-Year Est. Return

Putnam Investments Boston, Massachusetts $75.7B AUM 34.45% 1-Year Est. Return

Adage Capital Partners Boston, Massachusetts $71.3B AUM 56.8% 1-Year Est. Return

Westfield Capital Management Boston, Massachusetts $30.6B AUM 61.81% 1-Year Est. Return

BAMCO Inc New York $66.6B AUM 7.35% 1-Year Est. Return

Atika Capital Management's SUM Position: Q4 2017 in Review

Atika Capital Management sold out of Summit Materials, Inc. Class A Common Stock (SUM) in Q4 2017, closing a stake of 76,827 shares — an estimated $2.39M sold.

Atika Capital Management first reported a position in SUM in Q2 2015 and held it in 7 quarters. The position peaked at $4.69M in Q4 2016. 228 funds tracked by Wall St. Rank hold SUM as of Q4 2017.

Atika Capital Management reported no remaining Summit Materials, Inc. Class A Common Stock position as of Q4 2017 after selling out during the quarter.
Atika Capital Management sold 76,827 Summit Materials, Inc. Class A Common Stock shares in Q4 2017, an estimated $2.39M.
Atika Capital Management first reported a position in Summit Materials, Inc. Class A Common Stock in Q2 2015 and held it in 7 quarters.
Atika Capital Management's Summit Materials, Inc. Class A Common Stock position peaked at $4.69M in Q4 2016.
228 funds tracked by Wall St. Rank held Summit Materials, Inc. Class A Common Stock as of Q4 2017.

Based on Atika Capital Management's 13F filing for Q4 2017, filed 14 Feb 2018.