CM
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Castleark Management’s MasTec MTZ Stock Holding History

Castleark Management’s Portfolio MTZ Stock Details MTZ Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$865K Sell
2,690
-5,780
-68% -$1.56M 0.03% 231
2025
Q4 		$1.84M Buy
8,470
+4,930
+139% +$1.03M 0.05% 205
2025
Q3 		$753K Hold
3,540
– – 0.02% 232
2025
Q2 		$603K Sell
3,540
-4,300
-55% -$619K 0.02% 223
2025
Q1 		$915K Buy
+7,840
New +$1.06M 0.03% 219
2023
Q3 		– Sell
-61,080
Closed -$7.21M – 305
2023
Q2 		$7.21M Sell
61,080
-4,350
-7% -$426K 0.33% 60
2023
Q1 		$6.18M Hold
65,430
– – 0.3% 71
2022
Q4 		$5.58M Buy
+65,430
New +$5.37M 0.29% 84
2020
Q3 		– Sell
-167,105
Closed -$7.5M – 368
2020
Q2 		$7.5M Buy
+167,105
New +$6.33M 0.33% 87
2018
Q3 		– Sell
-348,723
Closed -$17.7M – 397
2018
Q2 		$17.7M Buy
348,723
+20,607
+6% +$995K 0.54% 46
2018
Q1 		$15.4M Buy
+328,116
New +$16.6M 0.49% 54
2017
Q1 		– Sell
-414,835
Closed -$15.9M – 399
2016
Q4 		$15.9M Buy
414,835
+7,840
+2% +$266K 0.51% 46
2016
Q3 		$12.1M Sell
406,995
-99,725
-20% -$2.73M 0.37% 76
2016
Q2 		$11.3M Buy
+506,720
New +$11.2M 0.36% 76
2014
Q3 		– Sell
-334,440
Closed -$10.3M – 328
2014
Q2 		$10.3M Buy
+334,440
New +$12.6M 0.28% 64
2013
Q4 		– Sell
-970,730
Closed -$29.7M – 360
2013
Q3 		$29.7M Buy
970,730
+795,922
+455% +$26.1M 0.84% 35
2013
Q2 		$5.75M Buy
+174,808
New +$5.27M 0.19% 63

Other funds holding MTZ

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
PP
Peconic Partners New York $5.78B AUM 127.23% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
HCC
Hill City Capital Boston, Massachusetts $2.8B AUM 79.27% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Victory Capital Management
Victory Capital Management San Antonio, Texas $156B AUM 27.51% 1-Year Est. Return
LPC
Lone Pine Capital Greenwich, Connecticut $12.5B AUM 54.4% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $140B AUM 27.84% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Castleark Management's MTZ Position: Q1 2026 in Review

Castleark Management reduced its MasTec (MTZ) stake by 68% in Q1 2026, selling an estimated $1.56M and leaving 2,690 shares worth $865K. The position accounts for 0.03% of the portfolio, ranked #231.

Castleark Management first reported a position in MTZ in Q2 2013 and has held it in 17 quarters since. The position peaked at $29.7M in Q3 2013. 805 funds tracked by Wall St. Rank hold MTZ as of Q1 2026.

  • Castleark Management held 2,690 shares of MasTec worth $865K as of Q1 2026.
  • Castleark Management sold 5,780 MasTec shares in Q1 2026, an estimated $1.56M.
  • MasTec made up 0.03% of Castleark Management's portfolio in Q1 2026, its #231 holding.
  • Castleark Management first reported a position in MasTec in Q2 2013 and has held it in 17 quarters since.
  • Castleark Management's MasTec position peaked at $29.7M in Q3 2013.
  • 805 funds tracked by Wall St. Rank held MasTec as of Q1 2026.

Based on Castleark Management's 13F filing for Q1 2026, filed 15 May 2026.