IBKR
Interactive Brokers Group Inc
Interactive Brokers Group Inc historical holders
total: 12
Lone Pine Capital Interactive Brokers Group Inc transactions over time
- Total transactions:
- 1
- New positions:
- 1
- Held since:
- 2026 Q2
- Held for:
- 1 quarter
- Latest activity:
- 2026 Q2
Stephen Mandel has been an institutional investor in Interactive Brokers Group Inc (IBKR) since 2026 Q2. According to 2026 Q2 report, Stephen Mandel holds 577,666 shares with a market value of roughly $50.28M representing 0.31% of their equity portfolio. The fund/company first acquired IBKR in 2026 Q2, initially purchasing 577,666 shares.
Does Stephen Mandel still hold IBKR?
Yes, Stephen Mandel continues to hold Interactive Brokers Group Inc (IBKR). According to their 2026 Q2 report, they maintain a position of 577,666 shares valued at approximately $50.28M, representing 0.31% of their equity portfolio.
When did Stephen Mandel first invest in 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, acquiring 577,666 shares in their initial purchase.
What is Stephen Mandel's average cost basis for IBKR?
Based on historical transaction data, Stephen Mandel's estimated cost basis for Interactive Brokers Group Inc (IBKR) is approximately $87.04 per share. This represents their average reported price* across all buy transactions.
Estimated cost basis*
- Weighted AVG buy price:
- $87.04
IBKR transactions history by Lone Pine Capital
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.