ADVANCED EMISSIONS SOLUTS IN

Ticker: ARQ CUSIP: 00770C101 Class: COM

PRINCIPAL FINANCIAL GROUP INC's Holding History (CIK: 0001126328)

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

Q1 2014

Shares 10,094 Value ($000) $248 Avg Close $19.55 Range $16.66 - $21.56

Q4 2013

Shares 5,095 Value ($000) $276 Avg Close $17.66 Range $13.54 - $22.08

Q3 2013

Shares 4,847 Value ($000) $207 Avg Close $15.59 Range $12.31 - $16.89

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2014	10,094	$248	$19.55	$16.66 - $21.56
Q4 2013	5,095	$276	$17.66	$13.54 - $22.08
Q3 2013	4,847	$207	$15.59	$12.31 - $16.89