TDG
Transdigm Group Incorporated
Transdigm Group Incorporated historical holders
total: 14
AltaRock Partners Transdigm Group Incorporated transactions over time
- Total transactions:
- 40
- New positions:
- 1
- Added:
- 18
- Reduced:
- 21
- Held since:
- 2014 Q4
- Held for:
- 46 quarters
- Latest activity:
- 2026 Q1
Mark Massey has been an institutional investor in Transdigm Group Incorporated (TDG) since 2014 Q4. According to 2026 Q1 report, Mark Massey holds 909,168 shares with a market value of roughly $1.05B representing 25.54% of their equity portfolio. The fund/company first acquired TDG in 2014 Q4, initially purchasing 155,084 shares. Since the initial investment, AltaRock Partners has made 39 more transactions in this position.
Does Mark Massey still hold TDG?
Yes, Mark Massey continues to hold Transdigm Group Incorporated (TDG). According to their 2026 Q1 report, they maintain a position of 909,168 shares valued at approximately $1.05B, representing 25.54% of their equity portfolio.
When did Mark Massey first invest in TDG?
Mark Massey first invested in Transdigm Group Incorporated (TDG) in 2014 Q4 at the reported quarter-end price of $196.35 per share, acquiring 155,084 shares in their initial purchase.
What is Mark Massey's average cost basis for TDG?
Based on historical transaction data, Mark Massey's estimated cost basis for Transdigm Group Incorporated (TDG) is approximately $365.57 per share. This represents their average reported price* across all buy transactions.
Estimated cost basis*
- Weighted AVG buy price:
- $365.56
- Weighted AVG sell price:
- $683.88
TDG transactions history by AltaRock Partners
40 results
| Period |
% of portfolio |
Shares held after* |
Reported price* |
Value* |
% (shares) of activity |
% change to portfolio |
|---|---|---|---|---|---|---|
|
2026 Q1
|
25.54%
|
909,168
|
$1,158.96
|
$1,053,689,345
|
-6.21% (-60,232)
|
-1.37%
|
|
2025 Q4
|
25.28%
|
969,400
|
$1,329.85
|
$1,289,156,590
|
-0.72% (-6,992)
|
-0.17%
|
|
2025 Q3
|
23.53%
|
976,392
|
$1,318.02
|
$1,286,904,184
|
-0.36% (-3,558)
|
-0.09%
|
|
2025 Q1
|
27.26%
|
979,950
|
$1,383.29
|
$1,355,555,036
|
-2.06% (-20,654)
|
-0.58%
|
|
2024 Q4
|
25.65%
|
1,000,604
|
$1,267.28
|
$1,268,045,437
|
-4.55% (-47,660)
|
-1.19%
|
|
2024 Q3
|
29.46%
|
1,048,264
|
$1,427.13
|
$1,496,009,002
|
-2.33% (-25,000)
|
-0.73%
|
|
2024 Q2
|
28.22%
|
1,073,264
|
$1,277.61
|
$1,371,212,819
|
-7.19% (-83,134)
|
-2.28%
|
|
2024 Q1
|
30.61%
|
1,156,398
|
$1,231.60
|
$1,424,219,777
|
-6.56% (-81,224)
|
-2.23%
|
|
2023 Q4
|
27.93%
|
1,237,622
|
$1,011.60
|
$1,251,978,415
|
-5.53% (-72,464)
|
-1.84%
|
|
2023 Q3
|
27.67%
|
1,310,086
|
$843.13
|
$1,104,572,809
|
-3.49% (-47,405)
|
-0.96%
|
|
2023 Q2
|
29.15%
|
$894.17
|
-1.85% (-25,633)
|
|||
|
2023 Q1
|
27.92%
|
$737.05
|
-1.89% (-26,600)
|
|||
|
2022 Q4
|
27.90%
|
$629.65
|
-6.17% (-92,655)
|
|||
|
2022 Q3
|
25.81%
|
$524.82
|
+3.00% (+43,700)
|
|||
|
2022 Q2
|
24.16%
|
$536.67
|
+2.63% (+37,400)
|
|||
|
2022 Q1
|
23.61%
|
$651.54
|
+5.20% (+70,225)
|
|||
|
2021 Q4
|
22.66%
|
$636.28
|
+1.88% (+24,872)
|
|||
|
2021 Q3
|
22.34%
|
$624.57
|
+5.57% (+70,000)
|
|||
|
2021 Q2
|
22.51%
|
$647.29
|
+31.87% (+303,619)
|
|||
|
2021 Q1
|
21.29%
|
$587.92
|
-7.11% (-72,962)
|
|||
|
2020 Q4
|
26.60%
|
$618.85
|
-16.28% (-199,436)
|
|||
|
2020 Q3
|
27.45%
|
$475.12
|
+2.74% (+32,629)
|
|||
|
2020 Q2
|
27.02%
|
$442.05
|
+18.04% (+182,265)
|
|||
|
2020 Q1
|
20.54%
|
$320.19
|
+72.68% (+425,143)
|
|||
|
2019 Q3
|
26.39%
|
$520.67
|
-3.47% (-21,000)
|
|||
|
2019 Q2
|
25.29%
|
$483.80
|
-5.69% (-36,561)
|
|||
|
2018 Q4
|
26.00%
|
$340.06
|
+20.22% (+108,054)
|
|||
|
2018 Q1
|
18.77%
|
$306.94
|
-7.78% (-45,100)
|
|||
|
2017 Q4
|
20.91%
|
$274.62
|
-10.36% (-67,000)
|
|||
|
2017 Q3
|
24.17%
|
$255.65
|
+13.00% (+74,367)
|
|||
|
2017 Q2
|
21.67%
|
$268.87
|
+6.73% (+36,094)
|
|||
|
2017 Q1
|
17.50%
|
$220.16
|
-9.37% (-55,434)
|
|||
|
2016 Q4
|
21.58%
|
$248.96
|
+34.69% (+152,356)
|
|||
|
2016 Q2
|
21.04%
|
$263.69
|
-39.86% (-291,067)
|
|||
|
2016 Q1
|
29.66%
|
$220.34
|
+5.03% (+34,972)
|
|||
|
2015 Q4
|
32.29%
|
$228.45
|
+12.16% (+75,380)
|
|||
|
2015 Q3
|
31.38%
|
$212.41
|
+42.95% (+186,242)
|
|||
|
2015 Q2
|
31.07%
|
$224.67
|
+87.11% (+201,871)
|
|||
|
2015 Q1
|
25.33%
|
$218.72
|
+49.44% (+76,666)
|
|||
|
2014 Q4
|
25.18%
|
$196.35
|
new
|
|||
* Shares, change to shares, sold shares, shares held after: split-adjusted.
* Reported price: this doesn't represent the actual buy or sell price. It is the split-adjusted price of the security as of the last day of the reported period.
If the security is completely sold out, we show the reported split-adjusted price prior to the actual period.
If the security is completely sold out, we show the reported split-adjusted price prior to the actual period.
* Estimated cost basis: based on "Reported price*" (not earlier than 2013 Q2). Calculation starts from the latest "new buy" activity to the latest "close out" activity (if any).
* Value or Price: If the security is completely sold out, we show the reported value (or price) prior to the actual period.
* New buy or own: this means there is no earlier reporting (for us or in general). So we can't know if the actual purchase of the security happened at the reported period or earlier.