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 (2025 Q4) SEC 13F filing(s) with portfolio value of $5,100,067,772.

What stocks does Mark Massey own?

In Mark Massey's portfolio as of 31 Dec 2025, the top 5 holdings are (AMZN) AMAZONCOM INC (33.10%), (TDG) TRANSDIGM GROUP INC (25.28%), (MSFT) MICROSOFT CORP (19.75%), (MCO) MOODY'S CORP (8.16%) and (MA) MASTERCARD INC - A (6.07%).

To see the historical data of AltaRock Partners's portfolio holdings please click on the "2025 Q4" dropdown menu and select the date.

To see AltaRock Partners's original 13F reports (2025 Q4), please click on the "important" button.

Portfolio value: $5,100M+
Period: 2025 Q4
Number of stock: 8
Update: 13 Feb 2026
Important
History
Ticker
Stock
% of
Portfolio
Shares*
Reported
Price*
% difference
Current Price
Value
% (shares)
Activity
% change to
Portfolio
GOOGL
ALPHABET INC-CL A
1.04%
169,391
$313.00
17.74% $368.53
$53,019,383
-50.81% (-175,000)
-1.07%
AMZN
AMAZONCOM INC
33.10%
7,314,534
$230.82
6.59% $246.03
$1,688,340,738
-3.22% (-243,719)
-1.10%
HLT
HILTON WORLDWIDE HOLDINGS IN
3.06%
542,613
$287.25
-
$155,865,584
MA
MASTERCARD INC - A
6.07%
541,836
$570.88
13.98% $491.08
$309,323,336
-7.23% (-42,250)
-0.47%
MSFT
MICROSOFT CORP
19.75%
2,082,357
$483.62
13.84% $416.67
$1,007,069,492
-18.95% (-486,910)
-4.62%
MCO
MOODY'S CORP
8.16%
814,503
$510.85
11.65% $451.35
$416,088,858
-14.15% (-134,232)
-1.34%
TDG
TRANSDIGM GROUP INC
25.28%
969,400
$1,329.85
6.85% $1,238.74
$1,289,156,590
-0.72% (-6,992)
-0.18%
V
VISA INC-CLASS A SHARES
3.55%
516,677
$350.71
7.74% $323.57
$181,203,791
-3.16% (-16,845)
-0.12%
8 of 8

Completely sold out

History
Ticker
Stock
Sold
Shares*
% change to
Portfolio
FICO
FAIR ISAAC CORP
667
-0.02%

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.