Quincy Lee's Ancient Art (Teton Capital) holds 1.29M shares of Interactive Brokers Group Inc (IBKR) worth about $111.9M as of June 30, 2026, according to the 13F-HR filed with the SEC on August 14, 2026. The position is 22.86% of the reported portfolio, the largest of 16 stock positions. Quincy Lee left the share count unchanged from the prior quarter.
What did the 2026 Q2 filing report for IBKR?
As of June 30, 2026, from the 13F-HR filed August 14, 2026.
| Value | |
|---|---|
| Portfolio weight | 22.86% |
| Shares | 1.29M |
| Reported value | $111.9M |
| Rank in portfolio | 1st of 16 |
| Next largest holding | ZG at 13.91% |
| Top three holdings | 49.12% of the book |
| Change this quarter | unchanged |
How concentrated is Quincy Lee in IBKR?
IBKR at 22.86% is 3.7 times the average stock position in the Quincy Lee portfolio, which is 6%. The next largest holding is ZG at 13.91%. The three largest stocks together are 49.12% of the reported book. A quarter earlier IBKR was 18.8% of the book.
Where does IBKR sit in the Quincy Lee portfolio?
IBKR is the largest of 16 stock positions in the Quincy Lee portfolio at 22.86%, above the fund's average stock position of 6%. Across the 2026 Q2 portfolio, Quincy Lee reported 16 stock positions, with 2 opened and 2 closed. The total portfolio value is about $489.4M, up 7% from the prior quarter.
How long has Quincy Lee held IBKR?
Quincy Lee has held IBKR since at least the quarter ended June 30, 2013, the start of the filings we track. The weight peaked at 34.08% in 2015 Q1. Last quarter the fund cut the position by 22%. Every reported trade is on the Quincy Lee IBKR trade history page.
Did other funds buy or sell IBKR in 2026 Q2?
Among the other tracked funds that had filed for 2026 Q2 as of August 14, 2026, 6 hold IBKR. Of those, one opened it this quarter. The largest buyers of IBKR this quarter were Ole Andreas Halvorsen and Stephen Mandel. The largest sellers were William Von Mueffling, John Armitage and Rob Vinall. Every tracked holder of IBKR is on the IBKR ownership page.
FAQ
What share of the Quincy Lee portfolio is IBKR?
IBKR is 22.86% of the Quincy Lee portfolio as of 2026 Q2, the largest of 16 stock positions.
What is the IBKR stake of Quincy Lee worth?
Quincy Lee holds 1.29M shares of IBKR, worth about $111.9M at June 30, 2026 prices, 22.86% of the reported portfolio.
What are the largest holdings of Quincy Lee?
The largest stock positions of Quincy Lee as of 2026 Q2 are IBKR (22.86%), ZG (13.91%) and UPWK (12.35%), together 49.12% of the book.
Did Quincy Lee's Ancient Art (Teton Capital) change its IBKR position in 2026 Q2?
Quincy Lee left the share count unchanged from the prior quarter.