Mark Massey: Stock Portfolio, Performance and Latest Trades
AltaRock Partners
13F portfolio value
$4.2B
8 holdings at Q2 2026
Mark Massey's portfolio
As of Q2 2026, filed August 17, 2026 · prices as of October 8, 2026
| Company | Share of portfolio | Average buy price | Return | Current price | Last quarter |
|---|---|---|---|---|---|
Amazon.com Inc.AMZN | 32.2% | $164.48 | +54.5% | $254.06 | Reduced −24% |
| 27.5% | $468.36 | +133% | $1,089.30 | Reduced −3.7% | |
Microsoft Corp.MSFT | 20.5% | $340.96 | +53.3% | $522.61 | Added +25% |
| 9.26% | $402.41 | +42.8% | $574.76 | Added +46% | |
| 6.77% | $258.68 | +45.0% | $375.10 | Added +68% | |
| 3.23% | $338.50 | +35.5% | $458.69 | Reduced −65% | |
Alphabet Inc.GOOGL | 0.35% | $81.68 | +326% | $348.29 | Reduced −3.2% |
| 0.12% | $242.88 | +33.1% | $323.29 | Reduced −0.9% |
Mark Massey's buys and sells
| Company | Action | Shares change | Value now |
|---|---|---|---|
| Reduced −65% | −559,412 | $137.1M | |
Amazon.com Inc.AMZN | Reduced −24% | −1,837,974 | $1.4B |
Microsoft Corp.MSFT | Added +25% | +466,945 | $870.8M |
| Added +68% | +337,793 | $287M | |
| Added +46% | +241,671 | $392.7M | |
| Reduced −3.7% | −33,413 | $1.2B | |
Alphabet Inc.GOOGL | Reduced −3.2% | −1,397 | $15M |
| Reduced −0.9% | −139 | $5M |
Mark Massey's portfolio by sector
Share of the stock portfolio at Q2 2026.
| Sector | Share |
|---|---|
| Consumer Discretionary | 32% |
| Industrials | 31% |
| Technology | 21% |
| Financials | 16% |
| Communication Services | 0.4% |
Portfolio performance: Mark Massey vs. benchmarks
Your result if you had bought each reported portfolio on the day it was made public and held it until the next report, against the S&P 500 and Nasdaq-100.
- You, copying after each 13F filing – estimated value
- S&P 500
- Nasdaq-100
| Total return | Per year | |
|---|---|---|
| You, copying after each 13F filing – estimated value | +59.8% | +9.8% |
| S&P 500 | +89.0% | +13.6% |
| Nasdaq-100 | +113.3% | +16.4% |
Prices were available for 91% of the portfolio value on average; the rest is left out of the return.
Mark Massey's most traded stocks
Quarters with a buy or a sell, all reports since Q4 2014.
| Company | Quarters bought | Quarters sold |
|---|---|---|
| 18 | 22 | |
| 16 | 14 | |
| 17 | 13 | |
Alphabet Inc.GOOGL | 9 | 16 |
| 8 | 17 | |
| 8 | 15 | |
Microsoft Corp.MSFT | 8 | 10 |
Amazon.com Inc.AMZN | 9 | 9 |
| 8 | 5 | |
| 3 | 4 | |
| 3 | 3 | |
| 4 | 2 | |
| 1 | 4 | |
Wabtec Corp.WAB | 1 | 4 |
Fair Isaac Corp.FICO | 1 | 3 |