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ACK Asset Management’s MasTec MTZ Stock Holding History

ACK Asset 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
2025
Q3 		– Sell
-125,000
Closed -$21.3M – 26
2025
Q2 		$21.3M Sell
125,000
-337,700
-73% -$48.6M 2.8% 17
2025
Q1 		$54M Sell
462,700
-69,100
-13% -$9.32M 8.87% 3
2024
Q4 		$72.4M Sell
531,800
-240,500
-31% -$32.2M 9.7% 2
2024
Q3 		$95.1M Hold
772,300
– – 11.75% 2
2024
Q2 		$82.6M Hold
772,300
– – 10.2% 2
2024
Q1 		$72M Hold
772,300
– – 8.39% 4
2023
Q4 		$58.5M Buy
772,300
+267,300
+53% +$16.7M 7.03% 3
2023
Q3 		$36.3M Sell
505,000
-10,000
-2% -$997K 5.28% 10
2023
Q2 		$60.8M Buy
515,000
+34,800
+7% +$3.41M 7.57% 2
2023
Q1 		$45.4M Buy
480,200
+40,000
+9% +$3.8M 6.92% 6
2022
Q4 		$37.6M Buy
440,200
+135,200
+44% +$11.1M 6.9% 6
2022
Q3 		$19.4M Buy
+305,000
New +$23.6M 5.13% 9
2019
Q2 		– Sell
-100,000
Closed -$3.98M – 35
2019
Q1 		$3.98M Sell
100,000
-80,000
-44% -$3.59M 1.1% 27
2018
Q4 		$7.23M Buy
+180,000
New +$7.75M 2.45% 16
2018
Q3 		– Sell
-200,000
Closed -$8.86M – 31
2018
Q2 		$8.86M Sell
200,000
-130,000
-39% -$6.28M 2.37% 17
2018
Q1 		$15.5M Sell
330,000
-70,000
-18% -$3.55M 3.9% 11
2017
Q4 		$19.6M Buy
+400,000
New +$17.8M 4.4% 7

Other funds holding MTZ

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
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
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
HRCM
Hood River Capital Management Palm Beach Gardens, Florida $9.98B AUM 145.42% 1-Year Est. Return
Nordea Investment Management
Nordea Investment Management Stockholm, Sweden $107B AUM 24.58% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $140B AUM 27.84% 1-Year Est. Return
Victory Capital Management
Victory Capital Management San Antonio, Texas $156B AUM 27.51% 1-Year Est. Return

ACK Asset Management's MTZ Position: Q3 2025 in Review

ACK Asset Management sold out of MasTec (MTZ) in Q3 2025, closing a stake of 125,000 shares — an estimated $21.3M sold.

ACK Asset Management first reported a position in MTZ in Q4 2017 and held it in 17 quarters. The position peaked at $95.1M in Q3 2024. 651 funds tracked by Wall St. Rank hold MTZ as of Q3 2025.

  • ACK Asset Management reported no remaining MasTec position as of Q3 2025 after selling out during the quarter.
  • ACK Asset Management sold 125,000 MasTec shares in Q3 2025, an estimated $21.3M.
  • ACK Asset Management first reported a position in MasTec in Q4 2017 and held it in 17 quarters.
  • ACK Asset Management's MasTec position peaked at $95.1M in Q3 2024.
  • 651 funds tracked by Wall St. Rank held MasTec as of Q3 2025.

Based on ACK Asset Management's 13F filing for Q3 2025, filed 14 Nov 2025.