ADVANCED EMISSIONS SOLUTS IN

Ticker: ARQ CUSIP: 00770C101 Class: COM

MACKAY SHIELDS LLC's Holding History (CIK: 0000061227)

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

Q1 2021

Shares 20,200 Value ($000) $111 Avg Close $5.60 Range $4.63 - $6.64

Q2 2020

Shares 62,100 Value ($000) $301 Avg Close $5.76 Range $4.44 - $8.00

Q1 2020

Shares 28,600 Value ($000) $187 Avg Close $9.59 Range $4.45 - $12.38

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2021	20,200	$111	$5.60	$4.63 - $6.64
Q2 2020	62,100	$301	$5.76	$4.44 - $8.00
Q1 2020	28,600	$187	$9.59	$4.45 - $12.38