Why would investors buy MicroStrategy’s convertible debt? Can’t they just buy his stock directly?

They can buy the stock directly; but convertible notes are suitable for investors who want to retain upside potential while also reducing downside risk.

Buying MSTR common stock is a direct bet on Strategy and its Bitcoin strategy: when it rises, profits have no cap, but when it falls, investors bear all the volatility; and in the company’s liquidation or debt restructuring, common stock has the lowest priority for repayment.

Convertible senior notes are like a combination of “bond principal protection + a stock call option.” Investors lend money to the company; at maturity, they usually can recover the principal. If the MSTR share price rises significantly and conversion conditions are met, investors can then convert into shares at a pre-agreed conversion price and participate in part of the upside. As senior unsecured debt, the notes also typically rank for repayment ahead of preferred stock and common stock.

For example, the 0% convertible notes issued by Strategy have a pre-set conversion price, which is usually higher than the stock’s market price at issuance. This means investors are not buying shares outright; instead, they give up interest in exchange for a right to participate in upside if the future share price rises sharply. If the share price doesn’t reach the desired level, investors theoretically can still hold until maturity and request repayment of principal—but this still depends on the company’s ability to meet its obligations.

Why would someone accept a 0% coupon? Because they may value three things:

1. Stronger downside protection relative to common stock: If the share price drops, common stock could lose significantly. If the company can still service its debt normally, the convertible note’s value stays closer to bond principal rather than falling fully in line with the share price.

2. Retaining upside optionality: If Bitcoin’s rise drives MSTR higher, the convertible note can be converted into stock to capture some of the stock upside.

3. Suits institutional trading strategies: Some institutions hold convertible notes while also shorting a portion of the stock to perform convertible arbitrage or volatility trading. What they pursue may not be long-term holding of MSTR, but rather relative returns driven by bond-and-option pricing.

However, this doesn’t mean convertible notes are necessarily better than stocks. If you are extremely bullish on Strategy and Bitcoin and can tolerate extreme volatility, holding common stock directly usually offers a more complete upside range; but the upside cap on a 0% convertible note is affected by conversion terms, the conversion price, redemption provisions, and the maturity date. Conversely, if the company’s credit deteriorates, even bondholders may still lose money, because these notes are unsecured debt and not principal-protected deposits.