In its latest 13F filing for the second quarter of 2026, AltaRock Partners reported a portfolio value of $4.24 billion. The firm, known for its highly concentrated, long-term investment approach, maintains a tight portfolio of just eight holdings. The top three positions—Amazon, TransDigm Group, and Microsoft—represent over 80% of the total portfolio value, underscoring the fund's high-conviction strategy inspired by investors like Warren Buffett.
The most significant changes during the quarter involved boosting stakes in technology and payment giants. AltaRock increased its position in Microsoft by 25%, making it a 20.54% holding. The firm showed even greater conviction in the payments sector, raising its Mastercard stake by 46% and its Visa holdings by nearly 68%. These additions significantly increased the portfolio weight of all three companies, signaling a strong bullish stance.
Conversely, AltaRock trimmed its two largest positions from the previous quarter. The firm reduced its top holding, Amazon, by over 24%, though the e-commerce and cloud leader still accounts for 32.21% of the portfolio. A more substantial reduction occurred in Moody's Corporation, where the fund cut its share count by nearly 65%, decreasing its portfolio weight from over 9% to just 3.23%. No new positions were initiated, and no full exits were reported during the period.