MSTR's Risk-Reward Ratio Becomes Problematic—Tug of War Between Heavy Shorts and Basis Trades

According to FactSet and Goldman Sachs data, MicroStrategy (MSTR) stocks hold a unique position in the U.S. market. It is increasingly believed that this is not just a bet on a simple stock price decline, but that a sophisticated arbitrage strategy is at play behind the scenes. From a risk-reward ratio perspective, the current MSTR market is a tug-of-war among multiple forces, marking an important phase investors need to understand.

Short interest reaching $34 billion, 14%—MSTR becomes the most shorted stock in the U.S.

A recent report highlights a shocking fact: the bearish short bets against MSTR have reached $34 billion in market value, accounting for 14% of its market cap at the time, making it the most shorted U.S. stock. Even Coinbase, a cryptocurrency exchange, ranks fourth with 11%. Since this analysis covers stocks with a market cap over $25 billion, the significance of this figure is even greater.

Considering that MSTR’s unrealized losses on its 717,722 Bitcoin holdings amount to about $7 billion, it seems straightforward why short sellers are so concentrated here. However, market participants recognize that there are complex dynamics at play that cannot be explained by this number alone.

The mechanics of the basis trade—targeting the price difference between IBIT and MSTR

One of the main explanations for the heavy short interest in MSTR is a strategy called the basis trade (or carry trade). This approach aims to profit from price differences between two related markets. Specifically, traders buy Bitcoin spot ETFs like BlackRock’s iShares Bitcoin Trust (IBIT) and simultaneously short MSTR stock. This allows them to profit from the narrowing premium on MSTR’s Bitcoin holdings and, if needed, from financing income generated from related futures, maintaining a market-neutral stance.

From a risk-reward perspective, this strategy involves hedging both sides to minimize directional risk while aiming to profit from the spread. Regardless of whether Bitcoin’s price moves up or down, traders wait for the moment when the gap between MSTR stock and IBIT narrows, securing profits.

What Jane Street’s large IBIT purchases reveal—realities of the carry trade

“Many of these short positions are still part of the MSTR/BTC basis trade. In particular, Jane Street has recently acquired a notably large position in IBIT,” says Brian Brookshire, a cryptocurrency finance expert.

According to recent 13F filings, Jane Street has purchased over 7 million shares of BlackRock’s iShares Bitcoin Trust. At the same time, they hold significant positions in MSTR. If Brookshire’s assumptions are correct, Jane Street’s IBIT purchases are likely part of a carry/basis trade combined with shorting MSTR.

The involvement of such large institutional investors indicates not just trend-following but a calculated recognition of arbitrage opportunities.

Rising MSTR-to-IBIT ratio—warning of worsening risk-reward

Interestingly, so far this year, this basis trade strategy has not performed as expected. The MSTR-to-IBIT ratio has increased by about 12%, showing an unexpected scenario where MSTR outperforms IBIT during a decline. Since the start of the year, MSTR has fallen 20%, while IBIT has dropped 27%, causing the spread to widen rather than narrow.

This phenomenon suggests that the short sellers’ initial expectation of MSTR’s relative outperformance has not materialized. From a risk-reward perspective, the current short position in MSTR may no longer be justified, as risks outweigh potential rewards.

This is a critical phase testing the effectiveness of the basis trade strategy. Whether future movements in MSTR and IBIT will accelerate position adjustments or whether patience for the spread to converge will pay off remains a key observation for market participants.