The second biggest gain on the biggest bets list belongs to IBKR
Sort Tenachine's fifteen biggest currently disclosed bets by gain since purchase and Clifford Sosin's CVNA leads at 563.89 percent, already covered on this site. Bryan Lawrence's IBKR position is second, up 475.64 percent, and it has never been the headline because its portfolio weight, 32.90 percent, is nowhere near Sosin's 83.37 percent.
Bryan Lawrence's position in Interactive Brokers, ticker IBKR, is up 475.64 percent since he opened it in the first quarter of 2019. On Tenachine's ranking of the fifteen biggest currently disclosed bets, that is the second largest gain of any position on the list. Only Clifford Sosin's CVNA, up 563.89 percent, comes out ahead, a position already covered on this site for a different reason, how long it and four other large bets have been held.
IBKR is 32.90 percent of Lawrence's disclosed portfolio, shared with four other tracked investors on Tenachine's data. Neither number is close to the largest on the list. Sosin's CVNA is 83.37 percent of his book. Guy Spier's BRK-B, at a 39.71 percent weight, is shared with nineteen other tracked investors. A gain this size sitting on a mid-sized, lightly shared position is why it has not shown up as a headline anywhere on this site before now.
Why weight and gain do not crown the same name
A position's gain since purchase and its current share of the portfolio are two different measurements of the same bet, and nothing requires them to move together. Sosin's CVNA leads on both, the largest gain and the largest weight on the list, which is exactly why it became the headline. Lawrence's IBKR leads on neither by itself, second on gain and far from first on weight, so a reader scanning the list for its single most extreme number would pass over it twice. Rank the same fifteen positions by weight instead of gain and IBKR does not crack the top five at all, sitting behind names like Duan Yongping's AAPL at 50.55 percent and Carl Icahn's IEP at 46.39 percent, a position that has actually lost 43.22 percent of its value since it was opened. The position is only remarkable once the specific question asked of it is gain, and gain alone.
What the shared count adds
Four other tracked investors hold IBKR alongside Lawrence, a real but modest number next to Tenachine's guide on the most widely shared single bet, where AltaRock's AMZN position is matched by thirty others. Interactive Brokers is not a mega-cap consensus name the way Amazon or Microsoft is, so five tracked investors independently building a large position in it, Lawrence's alone at 32.90 percent of his book, says something about the stock beyond price momentum. It does not say the position was a good idea in hindsight because of who else held it, and the count of five is itself small enough that a couple of managers exiting would change the picture.
None of this is a signal to buy or hold Interactive Brokers, and Lawrence's 475.64 percent is a number computed from a disclosed average cost against a single recent price snapshot, not a full trading history. Tenachine's own limits on this kind of figure, covered in the guide on Berkowitz's and Sosin's positions, apply here without change: a filing shows where a position stands today, not everything that happened to it since 2019. What this guide adds to that is narrower. The most extreme number on a ranked list is not always the second or third line down, and a position worth checking can sit quietly behind one that already got the attention.