Mark Massey's Portfolio

AltaRock Partners 13F holdings

What is Mark Massey's portfolio?

AltaRock Partners has disclosed a total of 8 security holdings in their (2026 Q1) SEC 13F filing(s) with portfolio value of $4,126,337,614.

What stocks does Mark Massey own?

In Mark Massey's portfolio as of 31 Mar 2026, the top 5 holdings are (AMZN) AMAZONCOM INC (38.20%), (TDG) TRANSDIGM GROUP INC (25.54%), (MSFT) MICROSOFT CORP (16.75%), (MCO) MOODY'S CORP (9.11%) and (MA) MASTERCARD INC - A (6.33%).

To see the historical data of AltaRock Partners's portfolio holdings please click on the "2026 Q1" dropdown menu and select the date.

To see AltaRock Partners's original 13F reports (2026 Q1), please click on the "important" button.

Portfolio value: $4,126M+
Period: 2026 Q1
Number of stock: 8
Update: 15 May 2026
Important
History
Ticker
Stock
% of
Portfolio
Shares*
Reported
Price*
% difference
Current Price
Value
% (shares)
Activity
% change to
Portfolio
GOOGL
ALPHABET INC-CL A
0.30%
43,391
$287.56
28.16% $368.53
$12,477,516
-74.38% (-126,000)
-0.88%
AMZN
AMAZONCOM INC
38.20%
7,567,946
$208.27
18.13% $246.03
$1,576,176,113
+3.46% (+253,412)
+1.28%
HLT
HILTON WORLDWIDE HOLDINGS IN
0.11%
15,341
$304.08
-
$4,664,891
-97.17% (-527,272)
-3.89%
MA
MASTERCARD INC - A
6.33%
522,836
$499.66
1.72% $491.08
$261,240,236
-3.51% (-19,000)
-0.23%
MSFT
MICROSOFT CORP
16.75%
1,867,537
$370.17
12.56% $416.67
$691,306,171
-10.32% (-214,820)
-1.93%
MCO
MOODY'S CORP
9.11%
862,036
$436.25
3.46% $451.35
$376,063,205
+5.84% (+47,533)
+0.50%
TDG
TRANSDIGM GROUP INC
25.54%
909,168
$1,158.96
6.88% $1,238.74
$1,053,689,345
-6.21% (-60,232)
-1.69%
V
VISA INC-CLASS A SHARES
3.65%
498,677
$302.24
7.06% $323.57
$150,720,137
-3.48% (-18,000)
-0.13%
8 of 8

Shares, change to shares, sold shares - 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.