John Osterweis - AltaRock Partners
Period:    Q1 2026
Portfolio date:    31 Mar 2026
No. of stocks:    8
Portfolio value:    $4,126,337,614
Holdings Activity Buys Sells    History
History Stock % of
Portfolio
Recent
Activity
Shares Avg. Buy
Price*
Value Current
Price
+/-
Since
Buy
52
Week
Low
52
Week
High
AMZN - Amazon.com, Inc. 38.20 Add 3.46% 7,567,946 $164.40 $1,576,176,113 $247.31 50.44% $196.00 $278.56
TDG - TransDigm Group Inc. 25.54 Reduce 6.21% 909,168 $424.95 $1,053,689,345 $1,235.00 190.62% $1,123.61 $1,519.36
MSFT - Microsoft Corp. 16.75 Reduce 10.32% 1,867,537 $320.11 $691,306,171 $390.99 22.14% $349.20 $551.05
MCO - Moody's Corp. 9.11 Add 5.84% 862,036 $351.42 $376,063,205 $495.72 41.06% $400.46 $544.40
MA - Mastercard Inc. 6.33 Reduce 3.51% 522,836 $371.70 $261,240,236 $537.70 44.66% $463.74 $598.04
V - Visa Inc. 3.65 Reduce 3.48% 498,677 $216.46 $150,720,137 $357.75 65.27% $293.28 $365.02
GOOGL - Alphabet Inc. 0.30 Reduce 74.38% 43,391 $82.60 $12,477,516 $352.51 326.76% $175.98 $408.37
HLT - Hilton Worldwide Holdings Inc. 0.11 Reduce 97.17% 15,341 $250.12 $4,664,891 $322.45 28.92% $253.16 $358.00
* Avg. Buy Price is an estimated cost basis: the share-weighted average of the quarter-end prices reported when this manager first bought or later added to the position (average-cost method, reset after a full exit). 13F filings disclose only quarter-end holdings, not actual trade prices, so this approximates — but does not exactly equal — what was paid.
Sector % analysis
Consumer Cyclical 38.31
Industrials 25.54
Financial Services 19.10
Technology 16.75
Communication Services 0.30