William Blair & Company
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William Blair & Company’s Quanta Services PWR Stock Holding History

William Blair & Company’s Portfolio PWR Stock Details PWR Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$124M Buy
225,850
+145,549
+181% +$75M 0.36% 65
2025
Q4 		$33.9M Buy
80,301
+40,956
+104% +$18M 0.09% 172
2025
Q3 		$16.3M Buy
39,345
+2,210
+6% +$859K 0.04% 262
2025
Q2 		$14M Buy
37,135
+1,291
+4% +$414K 0.04% 291
2025
Q1 		$9.11M Sell
35,844
-487
-1% -$141K 0.03% 348
2024
Q4 		$11.5M Buy
36,331
+9,859
+37% +$3.17M 0.03% 314
2024
Q3 		$7.89M Buy
26,472
+1,270
+5% +$336K 0.02% 393
2024
Q2 		$6.4M Buy
25,202
+2,111
+9% +$559K 0.02% 418
2024
Q1 		$6M Buy
23,091
+665
+3% +$147K 0.02% 442
2023
Q4 		$4.84M Buy
22,426
+1,640
+8% +$303K 0.02% 469
2023
Q3 		$3.89M Buy
20,786
+2,012
+11% +$403K 0.01% 495
2023
Q2 		$3.69M Buy
18,774
+3,456
+23% +$603K 0.01% 509
2023
Q1 		$2.55M Sell
15,318
-2,286
-13% -$351K 0.01% 599
2022
Q4 		$2.51M Buy
17,604
+1,517
+9% +$215K 0.01% 575
2022
Q3 		$2.05M Sell
16,087
-1,074
-6% -$147K 0.01% 617
2022
Q2 		$2.15M Buy
17,161
+1,005
+6% +$123K 0.01% 619
2022
Q1 		$2.13M Buy
16,156
+2,884
+22% +$320K 0.01% 681
2021
Q4 		$1.52M Buy
13,272
+831
+7% +$95.8K ﹤0.01% 807
2021
Q3 		$1.42M Buy
12,441
+737
+6% +$73.9K ﹤0.01% 794
2021
Q2 		$1.06M Sell
11,704
-4,017
-26% -$377K ﹤0.01% 899
2021
Q1 		$1.38M Buy
15,721
+2,037
+15% +$162K 0.01% 794
2020
Q4 		$985K Sell
13,684
-2,825
-17% -$186K ﹤0.01% 855
2020
Q3 		$873K Sell
16,509
-3,753
-19% -$175K ﹤0.01% 793
2020
Q2 		$795K Sell
20,262
-1,873
-8% -$66.8K ﹤0.01% 791
2020
Q1 		$702K Sell
22,135
-3,375
-13% -$125K ﹤0.01% 773
2019
Q4 		$1.04M Buy
25,510
+2,791
+12% +$114K 0.01% 771
2019
Q3 		$859K Buy
22,719
+1,457
+7% +$52.6K ﹤0.01% 798
2019
Q2 		$832K Sell
21,262
-1,029
-5% -$39.1K ﹤0.01% 813
2019
Q1 		$841K Buy
22,291
+1,501
+7% +$52.4K 0.01% 787
2018
Q4 		$626K Buy
20,790
+2,415
+13% +$78.1K ﹤0.01% 834
2018
Q3 		$613K Sell
18,375
-515
-3% -$17.5K ﹤0.01% 893
2018
Q2 		$631K Hold
18,890
– – ﹤0.01% 865
2018
Q1 		$649K Buy
18,890
+5,150
+37% +$187K ﹤0.01% 837
2017
Q4 		$537K Hold
13,740
– – ﹤0.01% 934
2017
Q3 		$513K Buy
13,740
+1,655
+14% +$58K ﹤0.01% 924
2017
Q2 		$398K Sell
12,085
-100
-0.8% -$3.33K ﹤0.01% 1060
2017
Q1 		$454K Buy
+12,185
New +$445K ﹤0.01% 932
2016
Q4 		– Sell
-17,200
Closed -$481K – 1454
2016
Q3 		$481K Hold
17,200
– – ﹤0.01% 848
2016
Q2 		$398K Buy
+17,200
New +$398K ﹤0.01% 881

Other funds holding PWR

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
PP
Peconic Partners New York $5.78B AUM 127.23% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return
Capital International Investors
Capital International Investors Los Angeles, California $427B AUM 29.17% 1-Year Est. Return

William Blair & Company's PWR Position: Q1 2026 in Review

William Blair & Company increased its Quanta Services (PWR) stake by 181% in Q1 2026, buying an estimated $75M and bringing the position to 225,850 shares worth $124M. The position accounts for 0.36% of the portfolio, ranked #65.

William Blair & Company first reported a position in PWR in Q2 2016 and has held it in 39 quarters since. 1,734 funds tracked by Wall St. Rank hold PWR as of Q1 2026.

  • William Blair & Company held 225,850 shares of Quanta Services worth $124M as of Q1 2026.
  • William Blair & Company bought 145,549 Quanta Services shares in Q1 2026, an estimated $75M.
  • Quanta Services made up 0.36% of William Blair & Company's portfolio in Q1 2026, its #65 holding.
  • William Blair & Company first reported a position in Quanta Services in Q2 2016 and has held it in 39 quarters since.
  • 1,734 funds tracked by Wall St. Rank held Quanta Services as of Q1 2026.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.