X0305 4 2012-05-08 0 0001050915 QUANTA SERVICES INC PWR 0001079430 COLSON JOHN R 2800 POST OAK BLVD., SUITE 2600 HOUSTON TX 77056-6175 1 1 0 0 Exec Chairman of the Board Common Stock 2012-05-08 4 S 0 3600 23.19 D 1247670 D Common Stock 2012-05-08 4 S 0 2500 23.20 D 1245170 D Common Stock 2012-05-08 4 S 0 1400 23.205 D 1243770 D Common Stock 2012-05-08 4 S 0 3400 23.21 D 1240370 D Common Stock 2012-05-08 4 S 0 1900 23.22 D 1238470 D Common Stock 2012-05-08 4 S 0 4100 23.23 D 1234370 D Common Stock 2012-05-08 4 S 0 4700 23.24 D 1229670 D Common Stock 2012-05-08 4 S 0 3600 23.25 D 1226070 D Common Stock 2012-05-08 4 S 0 3900 23.26 D 1222170 D Common Stock 2012-05-08 4 S 0 2200 23.27 D 1219970 D Common Stock 2012-05-08 4 S 0 1900 23.28 D 1218070 D Common Stock 2012-05-08 4 S 0 2200 23.29 D 1215870 D Common Stock 2012-05-08 4 S 0 2441 23.30 D 1213429 D Common Stock 2012-05-08 4 S 0 400 23.31 D 1213029 D Common Stock 2012-05-08 4 S 0 1900 23.32 D 1211129 D Common Stock 2012-05-08 4 S 0 800 23.33 D 1210329 D Common Stock 2012-05-08 4 S 0 3300 23.34 D 1207029 D Common Stock 2012-05-08 4 S 0 7600 23.35 D 1199429 D Common Stock 2012-05-08 4 S 0 7500 23.36 D 1191929 D Common Stock 2012-05-08 4 S 0 10553 23.37 D 1181376 D Common Stock 2012-05-08 4 S 0 9100 23.38 D 1172276 D Common Stock 2012-05-08 4 S 0 8400 23.39 D 1163876 D Common Stock 2012-05-08 4 S 0 200 23.395 D 1163676 D Common Stock 2012-05-08 4 S 0 6600 23.40 D 1157076 D Common Stock 2012-05-08 4 S 0 300 23.405 D 1156776 D Common Stock 2012-05-08 4 S 0 10300 23.41 D 1146476 D Common Stock 2012-05-08 4 S 0 100 23.415 D 1146376 D Common Stock 2012-05-08 4 S 0 300 23.42 D 1146076 D Common Stock 2012-05-08 4 S 0 1100 23.43 D 1144976 D Common Stock 2012-05-08 4 S 0 2700 23.44 D 1142276 D This report is the second of three reports reflecting dispositions of common stock on May 8, 2012, as the SEC's electronic filing system permits a maximum of 30 transaction lines on Table I of Form 4. /s/ Carolyn M. Campbell, Atty-in-Fact 2012-05-09