Stocks/Funds/CIK 1631014

ALTAROCK PARTNERS LLC

long-term holderconcentrated
Quarterly 13F filings · Latest period 2026-03-31 · CIK 1631014
Assets
$4.13B
-17.0% YoY
Holdings
8
Lifetime alpha vs market
+1.17% annual
Average hold time
7.4 yr
median 8.5 yr

Quarterly history

Cum return +59% vs S&P +52% · α +7% lifetimeAUM $4.1B · peak $5.5BFlow $-288M (-6%)2016-062017-122019-062020-122022-062023-122025-062026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
+2.25%
adds when stocks drop
when a holding falls −10%+
Middle response
-1.57%
baseline attrition
Rally response
-0.30%
trims into rallies
when a holding rises +10%+

Top positions · 8

Ticker$ value% portYoYHold time
AMZNAmazon.com, Inc.$1.58B38.2%+9.5%4.3 yr
TDGTransDigm Group Incorpor$1.05B25.5%-10.5%10.5 yr
MSFTMicrosoft Corporation$691M16.8%-0.6%5.0 yr
MCOMoody's Corporation$376M9.1%-5.6%10.5 yr
MAMastercard Incorporated$261M6.3%-8.5%10.5 yr
VVisa Inc.$151M3.7%-13.1%10.5 yr
GOOGLAlphabet Inc.$12M0.3%6.5 yr
HLTHilton Worldwide Holding$5M0.1%+33.9%1.5 yr

Portfolio composition (YoY)

Industry mix
Specialty Retail38.2%+18.3pp$1.58B
Aerospace & Defense25.5%-1.7pp$1.05B
Software - Infrastructure16.8%-2.7pp$691M
Financial - Credit Services10.0%-2.5pp$412M
Financial - Data & Stock Exchanges9.1%+0.2pp$376M
Internet Content & Information0.3%-10.4pp$12M
Travel Lodging0.1%-1.1pp$5M
Country
US100.0%+0.0pp
Top 5: 95.9% · Top 10: 100.0% · Top 25: 100.0%

Winners

TickerPrev $PnLYoY %
AMZN$990M+0.09B9.5%
HLT$62M+0.02B33.9%
MSFT$968M-0.01B-0.6%
MCO$443M-0.02B-5.6%
MA$321M-0.03B-8.5%

Losers

TickerPrev $PnLYoY %
TDG$1.36B-0.13B-10.5%
V$298M-0.04B-13.1%
MA$321M-0.03B-8.5%
MCO$443M-0.02B-5.6%
MSFT$968M-0.01B-0.6%

Top buys this quarter · 2

AMZN Amazon.com, Inc.+$1.58B
MCO Moody's Corporation+$376M

Top sells this quarter · 6

GOOGL Alphabet Inc.$0M
HLT Hilton Worldwide Holdings Inc.$160M
MSFT Microsoft Corporation$80M
TDG TransDigm Group Incorporated$70M
MA Mastercard Incorporated$9M
V Visa Inc.$5M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$4.13B8-0.72%+17.59%-18.31%-0.29B
2025-12-31$5.10B8+12.11%+17.72%-5.60%-0.44B
2025-09-30$5.47B9+14.55%+17.52%-2.97%+0.07B
2025-06-30$5.48B9+21.99%+14.94%+7.05%-0.24B
2025-03-31$4.97B9+9.95%+8.30%+1.65%+0.14B
2024-12-31$4.94B10+26.50%+24.89%+1.61%-0.31B
2024-09-30$5.08B9+43.81%+36.04%+7.77%-0.02B
2024-06-30$4.86B9+31.98%+24.49%+7.49%+0.04B
2024-03-31$4.65B8+50.28%+29.62%+20.66%-0.39B
2023-12-31$4.48B8+55.89%+26.18%+29.71%-0.21B
2023-09-30$3.99B8+41.64%+21.57%+20.07%-0.02B
2023-06-30$4.16B8+36.18%+19.42%+16.75%-0.14B
2023-03-31$3.65B8-2.83%-7.82%+4.99%-0.06B
2022-12-31$3.18B8+6.84%+7.56%-0.72%-0.08B
2022-09-30$3.05B8-7.42%-4.93%-2.49%+0.05B
2022-06-30$3.24B8-15.78%-16.11%+0.33%-0.06B