Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Class C units representing limited partner interests^F1,F2	$0.00	Feb 11, 2016	J	323,584	A	—	—	Common units representing limited partner interests	323,584	11,735,446	I

Explanation of responses

F1On November 25, 2014, Western Gas Partners, LP ("WES") issued 10,913,853 Class C units to APC Midstream Holdings, LLC ("AMH") at a price of $68.72 per unit. The Class C units receive distributions in the form of additional Class C units until the end of 2017 (unless earlier converted), and will be disregarded with respect to calculating the WES's cash distributions until they are converted to common units. The above transaction represents the quarterly distribution of Class C Units to AMH for the quarter ended December 31, 2015. The Class C units will convert into common units on a one-for-one basis on December 31, 2017, unless WES elects to convert such units earlier or AMH extends the conversion date.
F2As of February 11, 2016, (i) WGP owns 49,296,205 WES common units and 100% of the membership interests in WES's general partner, Western Gas Holdings, LLC, and AMH owns 308,490 WES common units and 11,735,446 Class C units, (ii) Western Gas Resources, Inc. ("WGR") owns (A) all of the membership interests of Western Gas Equity Holdings, LLC ("WGP GP"), the general partner of WGP, (B) 87.3% of the issued and outstanding limited partner interests in WGP, and (Z) 100% of the membership interests in AMH, (iii) WGP GP owns a 0% noneconomic general partner interest in WGP, and (iv) Anadarko Petroleum Corporation ("Anadarko") owns all of the issued and outstanding shares of common stock of WGR. Accordingly, WGP GP, WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by WGP, and WGR and Anadarko may be deemed to be indirect beneficial owners of any securities held by AMH.
F3As of February 11, 2016, (i) AMM owns 449,129 WES common units, (ii) Anadarko E&P Onshore LLC ("Anadarko E&P") owns 100% of the membership interests in AMM, (iii) Anadarko Holding Company owns 100% of the member interests in Anadarko E&P, and (iv) Anadarko owns 100% of the member interests in Anadarko Holding Company ("AHC"). Accordingly, Anadarko E&P, AHC and Anadarko may be deemed to be indirect beneficial owners of any securities held by AMM.