A.R.T. Advisors’s Pioneer Energy Services Corp. PES Stock Holding History

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2019 Q2	–	Sell	-33,807	Closed	-$60K	–	1796
2019 Q1	$60K	Sell	33,807 -10,738	-24%	-$18.5K	﹤0.01%	1205
2018 Q4	$55K	Buy	44,545 +24,539	+123%	+$61.1K	﹤0.01%	1212
2018 Q3	$59K	Sell	20,006 -107,698	-84%	-$416K	﹤0.01%	1310
2018 Q2	$747K	Buy	+127,704	New	+$568K	0.03%	763
2017 Q2	–	Sell	-102,800	Closed	-$411K	–	1890
2017 Q1	$411K	Buy	+102,800	New	+$572K	0.02%	883
2016 Q1	–	Sell	-132,703	Closed	-$287K	–	1795
2015 Q4	$287K	Buy	132,703 +122,088	+1,150%	+$315K	0.01%	1076
2015 Q3	$22K	Buy	+10,615	New	+$36.1K	﹤0.01%	1313
2015 Q2	–	Sell	-439,935	Closed	-$2.38M	–	1831
2015 Q1	$2.38M	Buy	+439,935	New	+$2.19M	0.08%	327
2014 Q4	–	Sell	-17,729	Closed	-$248K	–	1778
2014 Q3	$248K	Sell	17,729 -105,758	-86%	-$1.65M	0.01%	1016
2014 Q2	$2.17M	Buy	123,487 +47,902	+63%	+$718K	0.11%	262
2014 Q1	$978K	Sell	75,585 -29,003	-28%	-$290K	0.05%	510
2013 Q4	$837K	Buy	104,588 +6,811	+7%	+$53.6K	0.04%	559
2013 Q3	$734K	Sell	97,777 -1,393	-1%	-$9.91K	0.04%	617
2013 Q2	$656K	Buy	+99,170	New	+$722K	0.02%	775