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CAT ROCK CAPITAL MANAGEMENT LP — 13F Holdings & Portfolio

CIK 1654648 · latest 13F-HR filed 2026-08-14

Backtest portfolio

CAT ROCK CAPITAL MANAGEMENT LP manages $431.0M in 13F-reported U.S. long-equity assets across 7 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are TDG (19.57%), FA (17.71%), MSFT (17.36%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 0 new positions and exited 7; 6 existing positions rose in reported value and 1 fell.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

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AUM
$431.0M

Long-equity book

Holdings
7

Distinct positions

Period
2026-06-30

Filed 2026-08-14

Q/Q Activity
+0 / −7 / ↑6 / ↓1

vs 2026-03-31

Portfolio charts

Latest quarter's book, what changed, and how the portfolio has evolved across filings.

Portfolio map

Q2 26
TDG19.6% · +37%FA17.7% · 0%MSFT17.4% · -19%ARES17.1% · +13%TKO15.8% · +11%MSCI6.5% · +19%TSM5.9% · -15%

Box size = position value; colour = change in share count vs the prior quarter (green added, red trimmed, blue new). Rows split across managers or share classes are combined. Click a box for the stock.

Sector mix

% of 13F value

Sectors from each company's SIC code; funds and ETFs grouped separately.

Biggest buys and sells

Q1 26 → Q2 26

Estimated from the change in shares held × the quarter-end price, so price moves alone don't count as buying. New and exited positions are included.

13F assets and positions

4 quarters

Total reported 13F value (bars) and number of positions (line) each quarter. Value changes include market moves.

Top positions over time

reported value

The eight largest current positions, valued at each quarter end.

Concentration

top 10 = 100%

Cumulative share of the portfolio held in the largest N positions.

Firm Profile & Key People

As of the firm’s regulatory filing dated Mar 18, 2026.

Assets Under Management
$968.5M
Discretionary
$968.5M
Employees
6
Accounts
4
Address
8 SOUND SHORE DRIVE
SUITE 250
GREENWICH, CT 06830
Phone
(203) 992-4630
Website
Name Title / Status Ownership Type
CAPTAIN, ALEXANDER, SALAH ControlPORTFOLIO MANAGER; LIMITED PARTNER; CEO
since Feb 2015
75% or moreIndividual
CAPTAIN, ALEXANDER, SALAH ControlMANAGING MEMBER OF CAT ROCK CAPITAL LLC
since May 2015
75% or moreIndividual
CAT ROCK CAPITAL GP LLC ControlGENERAL PARTNER
since Feb 2015
Less than 5%Domestic Entity
FLINN, ANDREW, JOSEPH ControlCHIEF COMPLIANCE OFFICER; CHIEF FINANCIAL OFFICER; CHIEF OPERATING OFFICER
since Oct 2017
Less than 5%Individual
CAPTAIN, ALEXANDER, SALAH Control
Indirect owner via CAT ROCK CAPITAL GP LLC
MANAGING MEMBER
since Feb 2015
75% or moreIndividual
Ownership & leadership changes · 2 filings with changes since Jun 19, 2015

From the firm’s regulatory filings, newest first. Dates are filing dates: a filing that no longer lists someone does not say when they left.

Oct 23, 2017 filing
  • No longer listedLEVINSON, DANIEL, MARK · CFO AND CCO; LIMITED PARTNER / MEMBER OF CAT ROCK CAPITAL LLC (RELYING ADVISER) · 10–25% · control person · listed since May 2015
  • AddedFLINN, ANDREW, JOSEPH · CHIEF COMPLIANCE OFFICER; CHIEF FINANCIAL OFFICER; CHIEF OPERATING OFFICER · Less than 5% · control person
  • ChangedCAPTAIN, ALEXANDER, SALAH · title MANAGING MEMBER OF CAT ROCK CAPITAL LLC (RELYING ADVISER) / PORTFOLIO MANAGER; LIMITED PARTNER; CEO → MANAGING MEMBER OF CAT ROCK CAPITAL LLC / PORTFOLIO MANAGER; LIMITED PARTNER; CEO
Oct 12, 2015 filing
  • ChangedCAPTAIN, ALEXANDER, SALAH · title PORTFOLIO MANAGER → MANAGING MEMBER OF CAT ROCK CAPITAL LLC (RELYING ADVISER) / PORTFOLIO MANAGER; LIMITED PARTNER; CEO
  • ChangedLEVINSON, DANIEL, MARK · title CFO AND CCO → CFO AND CCO; LIMITED PARTNER / MEMBER OF CAT ROCK CAPITAL LLC (RELYING ADVISER)
Jun 19, 2015 filing (earliest on record)
  • ListedCAPTAIN, ALEXANDER, SALAH · PORTFOLIO MANAGER · 75% or more · control person
  • ListedCAPTAIN, ALEXANDER, SALAH · MANAGING MEMBER · 75% or more · indirect via CAT ROCK CAPITAL GP LLC · control person
  • ListedCAT ROCK CAPITAL GP LLC · GENERAL PARTNER · Less than 5% · control person
  • ListedLEVINSON, DANIEL, MARK · CFO AND CCO · 10–25% · control person

Quarter-over-quarter changes

Changes in reported position value vs the prior 13F, so price moves count too, not just shares bought or sold.

Top Adds (vs prior quarter)

Show all 6 →

Top Trims

Show all 1 →

New Positions

  • No new positions this quarter.
Show all 0 →

Exited Positions

Show all 7 →

CAT ROCK CAPITAL MANAGEMENT LP Holdings (2026-06-30)

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 TRANSDIGM GROUP INC TDG 893641100 $84.4M 19.57% 63,339 SH
2 FIRST ADVANTAGE CORP NEW FA 31846B108 $76.3M 17.71% 4,228,018 SH
3 MICROSOFT CORP MSFT 594918104 $74.8M 17.36% 200,603 SH
4 ARES MANAGEMENT CORPORATION ARES 03990B101 $73.9M 17.15% 664,000 SH
5 TKO GROUP HOLDINGS INC TKO 87256C101 $68.3M 15.84% 339,211 SH
6 MSCI INC MSCI 55354G100 $28.0M 6.50% 50,005 SH
7 TAIWAN SEMICONDUCTOR MANUFAC TSM 874039100 $25.3M 5.87% 52,976 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-14 $431.0M 7 0001214659-26-010395
2026-03-31 2026-05-15 $643.6M 14 0001214659-26-006432
2025-12-31 2026-02-18 $697.4M 16 0001214659-26-002115
2025-09-30 2025-11-14 $810.4M 16 0001214659-25-016662
Filer Information
Address
8 SOUND SHORE DRIVE, SUITE 250
GREENWICH, CT 06830
Phone
(203) 992-4630
Filing Manager
CAT ROCK CAPITAL MANAGEMENT LP
GREENWICH, CT
Signatory
Andrew Flinn
CCO, COO and CFO