UOC
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UBS O'Connor’s MasTec MTZ Stock Holding History

UBS O'Connor’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
Q4 		– Sell
-19,080
Closed -$4.06M – 286
2025
Q3 		$4.06M Buy
+19,080
New +$3.49M 0.12% 77
2023
Q4 		– Sell
-26,295
Closed -$1.89M – 572
2023
Q3 		$1.89M Buy
26,295
+4,300
+20% +$429K 0.03% 253
2023
Q2 		$2.59M Buy
+21,995
New +$2.15M 0.05% 219
2023
Q1 		– Sell
-84,612
Closed -$7.22M – 687
2022
Q4 		$7.22M Buy
84,612
+59,384
+235% +$4.87M 0.13% 94
2022
Q3 		$1.6M Sell
25,228
-57,800
-70% -$4.47M 0.02% 677
2022
Q2 		$5.95M Sell
83,028
-67,539
-45% -$5.27M 0.06% 198
2022
Q1 		$13.1M Sell
150,567
-80,551
-35% -$7.04M 0.14% 74
2021
Q4 		$21.3M Buy
231,118
+67,883
+42% +$6.2M 0.21% 45
2021
Q3 		$14.1M Buy
163,235
+66,768
+69% +$6.33M 0.11% 79
2021
Q2 		$10.2M Sell
96,467
-70,431
-42% -$7.65M 0.09% 101
2021
Q1 		$15.6M Buy
166,898
+98,075
+143% +$8.39M 0.23% 60
2020
Q4 		$4.69M Buy
+68,823
New +$3.86M 0.1% 231
2015
Q4 		– Sell
-101,358
Closed -$1.6M – 505
2015
Q3 		$1.6M Buy
101,358
+55,804
+123% +$972K 0.02% 399
2015
Q2 		$906K Sell
45,554
-17,504
-28% -$327K 0.01% 609
2015
Q1 		$1.22M Buy
+63,058
New +$1.26M 0.01% 483

Other funds holding MTZ

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
Victory Capital Management
Victory Capital Management San Antonio, Texas $178B AUM 37.23% 1-Year Est. Return
HCC
Hill City Capital Boston, Massachusetts $4.28B AUM 80.76% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
PP
Peconic Partners New York $8.04B AUM 107.18% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
HRCM
Hood River Capital Management Palm Beach Gardens, Florida $13.8B AUM 163.97% 1-Year Est. Return
First Trust Advisors
First Trust Advisors Wheaton, Illinois $170B AUM 46.21% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.55T AUM 33.47% 1-Year Est. Return

UBS O'Connor's MTZ Position: Q4 2025 in Review

UBS O'Connor sold out of MasTec (MTZ) in Q4 2025, closing a stake of 19,080 shares — an estimated $4.06M sold.

UBS O'Connor first reported a position in MTZ in Q1 2015 and held it in 15 quarters. The position peaked at $21.3M in Q4 2021. 695 funds tracked by Wall St. Rank hold MTZ as of Q4 2025.

  • UBS O'Connor reported no remaining MasTec position as of Q4 2025 after selling out during the quarter.
  • UBS O'Connor sold 19,080 MasTec shares in Q4 2025, an estimated $4.06M.
  • UBS O'Connor first reported a position in MasTec in Q1 2015 and held it in 15 quarters.
  • UBS O'Connor's MasTec position peaked at $21.3M in Q4 2021.
  • 695 funds tracked by Wall St. Rank held MasTec as of Q4 2025.

Based on UBS O'Connor's 13F filing for Q4 2025, filed 13 Feb 2026.