Stephen Mandel
Lone Pine Capital
Stephen Mandel Interactive Brokers Group Inc stake
total: 304
Lone Pine Capital IBKR trades
- Total transactions:
- 1
- New positions:
- 1
- Held since:
- 2026 Q2
- Held for:
- 1 quarter
- Latest activity:
- 2026 Q2
According to 2026 Q2 report, Stephen Mandel holds 577,666 Interactive Brokers Group Inc (IBKR) shares with a market value of roughly $50.28M accounting for 0.31% of the overall portfolio. To date, the estimated cost basis is nearly $87.04 for "buy" trades. Lone Pine Capital first purchased IBKR in 2026 Q2, initially acquiring 577,666 shares.
When did Stephen Mandel buy Interactive Brokers Group Inc (IBKR)?
Stephen Mandel first invested in Interactive Brokers Group Inc (IBKR) in 2026 Q2 at the reported quarter-end price of $87.04 per share.
What's the cost basis of Lone Pine Capital's IBKR stake?
The estimated cost basis for Interactive Brokers Group Inc (IBKR) stake is around $87.04 per share. This represents their average reported price* across all buy transactions
Estimated cost basis*
- Weighted AVG buy price:
- $87.04
Stephen Mandel's historical trades in Interactive Brokers Group Inc
1 result
| Period |
% of portfolio |
Shares held after* |
Reported price* |
Value* |
% (shares) of activity |
% change to portfolio |
|---|---|---|---|---|---|---|
|
2026 Q2
|
0.31%
|
577,666
|
$87.04
|
$50,280,049
|
new
|
+0.31%
|
* Shares, change to shares, sold shares, shares held after: split-adjusted.
* Reported price: this doesn't represent the actual buy or sell price. It is the split-adjusted price of the security as of the last day of the reported period.
If the security is completely sold out, we show the reported split-adjusted price prior to the actual period.
If the security is completely sold out, we show the reported split-adjusted price prior to the actual period.
* Estimated cost basis: based on "Reported price*" (not earlier than 2013 Q2). Calculation starts from the latest "new buy" activity to the latest "close out" activity (if any).
* Value or Price: If the security is completely sold out, we show the reported value (or price) prior to the actual period.
* New buy or own: this means there is no earlier reporting (for us or in general). So we can't know if the actual purchase of the security happened at the reported period or earlier.