PLAINS ALL AMERN PIPELINE L

Ticker: PAA CUSIP: 726503105 Class: UNIT LTD PARTN

Chesley Taft & Associates LLC's Holding History (CIK: 0001164632)

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

Q3 2014

Shares 5,900 Value ($000) $347 Avg Close — Range —

Q2 2014

Shares 5,900 Value ($000) $354 Avg Close — Range —

Q1 2014

Shares 5,100 Value ($000) $281 Avg Close — Range —

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2014	5,900	$347	—	—
Q2 2014	5,900	$354	—	—
Q1 2014	5,100	$281	—	—