X0303 4/A 2011-02-08 2011-02-10 0001481506 PAA NATURAL GAS STORAGE LP PNG 0001490402 Plains All American GP LLC 333 CLAY STREET, SUITE 1600 HOUSTON TX 77002 0 0 1 0 0001490401 Plains AAP, L.P. 333 CLAY STREET, SUITE 1600 HOUSTON TX 77002 0 0 1 0 0001490400 PAA GP LLC 333 CLAY STREET, SUITE 1600 HOUSTON TX 77002 0 0 1 0 0001070423 PLAINS ALL AMERICAN PIPELINE LP 333 CLAY STREET, SUITE 1600 HOUSTON TX 77002 0 0 1 0 Common Units 2011-02-08 4 A 0 10166341 21.75 A 28272870 I See Note 1 PAA GP LLC, is the general partner of Plains All American Pipeline, L.P. ("PAA"), the record holder of the units. Plains AAP, L.P. owns all of the membership interests in PAA GP LLC and Plains All American GP LLC is the general partner of Plains AAP, L.P. Accordingly, Plains All American GP LLC, Plains AAP, L.P. and PAA GP LLC may be deemed to be indirect beneficial owners of any securities held by PAA. PAA is also the sole member of PNGS GP LLC, which is the general partner of the Issuer. /s/ Tim Moore 2011-02-10