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 5200 23.00 D 1386676 D Common Stock 2012-05-08 4 S 0 2300 23.05 D 1384376 D Common Stock 2012-05-08 4 S 0 10000 23.01 D 1374376 D Common Stock 2012-05-08 4 S 0 8800 23.02 D 1365576 D Common Stock 2012-05-08 4 S 0 500 23.025 D 1365076 D Common Stock 2012-05-08 4 S 0 9238 23.03 D 1355838 D Common Stock 2012-05-08 4 S 0 300 23.035 D 1355538 D Common Stock 2012-05-08 4 S 0 10300 23.04 D 1345238 D Common Stock 2012-05-08 4 S 0 10467 23.05 D 1334771 D Common Stock 2012-05-08 4 S 0 600 23.055 D 1334171 D Common Stock 2012-05-08 4 S 0 11100 23.06 D 1323071 D Common Stock 2012-05-08 4 S 0 5001 23.07 D 1318070 D Common Stock 2012-05-08 4 S 0 3900 23.08 D 1314170 D Common Stock 2012-05-08 4 S 0 3500 23.09 D 1310670 D Common Stock 2012-05-08 4 S 0 4200 23.10 D 1306470 D Common Stock 2012-05-08 4 S 0 1600 23.105 D 1304870 D Common Stock 2012-05-08 4 S 0 6200 23.11 D 1298670 D Common Stock 2012-05-08 4 S 0 200 23.115 D 1298470 D Common Stock 2012-05-08 4 S 0 3200 23.12 D 1295270 D Common Stock 2012-05-08 4 S 0 600 23.125 D 1294670 D Common Stock 2012-05-08 4 S 0 4000 23.13 D 1290670 D Common Stock 2012-05-08 4 S 0 1500 23.135 D 1289170 D Common Stock 2012-05-08 4 S 0 4600 23.14 D 1284570 D Common Stock 2012-05-08 4 S 0 4300 23.15 D 1280270 D Common Stock 2012-05-08 4 S 0 7300 23.155 D 1272970 D Common Stock 2012-05-08 4 S 0 11700 23.16 D 1261270 D Common Stock 2012-05-08 4 S 0 300 23.165 D 1260970 D Common Stock 2012-05-08 4 P 0 5200 23.17 D 1255770 D Common Stock 2012-05-08 4 S 0 600 23.175 D 1255170 D Common Stock 2012-05-08 4 S 0 3900 23.18 D 1251270 D This report is the first 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