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Investor profile
Stephen Mandel
Lone Pine Capital · Founder · Net worth: ~$3.5B
Founded Lone Pine in 1997 after Tiger Management. One of the most successful long-only growth funds — turned $1 into $12+ over three decades. Famously low-profile despite massive returns.
"Long-only growth at a reasonable price. Deep research. Tiger Cub."
Tracked positions
5
Top concentration
29%
Longest holding
Microsoft (since 2014)
Realized 10-year track record
Lone Pine Capital partner letters
10y CAGR
8.6%
net of fees
Alpha vs S&P
-4.5%
vs 13.1% benchmark
Win rate
30%
years beating S&P
Quality score
2.5
computed 0–10
Best year
+35%
Worst year
-36%
Cumulative 10y
2.3×
Volatility
20%
Recent moves
Manager quality score: 9/10
Every tracked 13F move — buys, adds, trims, and exits — over the last two quarters.
Q4 2025
2 buys · 0 sells
| Ticker | Activity | % portfolio |
|---|---|---|
| META | Add 3% Small add — already a top Lone Pine position. | 6.40% |
| FTNT | Buy (new) New Fortinet cybersecurity position. | 2.80% |
Q2 2025
2 buys · 0 sells
| Ticker | Activity | % portfolio |
|---|---|---|
| AMZN | Add 8% Building Amazon. | 6.50% |
| META | Add 6% Steady META add. | 6.00% |
Q4 2024
2 buys · 0 sells
| Ticker | Activity | % portfolio |
|---|---|---|
| AMZN | Add 10% Adding Amazon. | 6.70% |
| META | Add 8% Steady META. | 5.80% |
Q3 2024
1 buy · 0 sells
| Ticker | Activity | % portfolio |
|---|---|---|
| META | Add 6% Lone Pine META. | 5.50% |
Q2 2024
1 buy · 0 sells
| Ticker | Activity | % portfolio |
|---|---|---|
| META | Buy (new) Lone Pine first META. | 5.00% |
Top holdings
Want Stephen move-alerts?
One email per 13F filing. Summarizes every new position, exit, and trim.
Similar investors
Tracked managers whose top positions overlap with Stephen's portfolio.
Data sourced from Lone Pine Capital 13F filings with the SEC. Approximate snapshot. Not investment advice.