Mandatory Convertible Preferred Stock

Mandatory Convertible Preferred Stock is a financial instrument that companies use to raise capital. Whoever buys it initially receives regular interest payments — similar to a bond, which is simply an interest-bearing loan to a company. After a fixed term, usually two to four years, the instrument is forced to convert into common stock. This conversion is not optional: it happens automatically, regardless of whether the holder considers it favorable at that point in time. That’s where the word 'Mandatory' in the name comes from, meaning simply 'compulsory' or 'obligatory'. The instrument thus combines the features of a bond — ongoing interest — with the inevitable outcome of a stock.

Why companies issue MCPS

For a company, MCPS solves a classic problem: it needs fresh capital but doesn’t want to flood the market with new shares right away. When a company issues a large number of new shares at once, each existing shareholder’s stake in the company shrinks — this is called dilution. With MCPS, the company pushes this dilution to a later, predictable point in time.

At the same time, rating agencies — companies that assess the creditworthiness of businesses — partly classify MCPS as equity rather than debt. This improves the company’s balance sheet on paper and can make it easier to access further credit. Banks and insurers in particular make deliberate use of this effect, since they are legally required to maintain a certain level of equity capital.

How the conversion works at the end of the term

At the time of purchase, the company sets two conversion prices: a lower threshold and an upper threshold. If the share price at the end of the term is below the lower threshold, the holder receives a fixed, agreed-upon maximum number of shares. If it is above the upper threshold, the holder receives fewer shares — because the higher price makes each share more valuable, so fewer shares are needed to represent the same amount. If the price falls in between, a sliding calculation applies.

This sounds complicated, but it follows a simple logic: the buyer fully participates in price declines, but only benefits from price gains to a limited extent. In exchange, the company pays an above-average interest rate during the term. So anyone who buys MCPS is trading away part of their upside potential for reliable interest payments.

A concrete example: a company issues MCPS at a price of 100 euros, with a lower threshold of 25 euros and an upper threshold of 30 euros per share. If the stock falls to 20 euros, the 100 euros convert into four shares — and the holder has effectively lost money. If it rises to 40 euros, the 100 euros convert into roughly 3.33 shares, which amounts to a gain, but less than a direct purchase of the stock would have yielded.

MCPS in the news and at tech companies

In financial and technology news, MCPS primarily comes up when companies need large amounts of capital in a short period — for example, for acquisitions or to expand their infrastructure. This is especially relevant in the AI sector right now: companies investing massively in data centers and graphics processors use MCPS to shoulder the high costs without immediately diluting their shareholders.

A well-known example is the US company Dell Technologies, which has used MCPS several times to finance major acquisitions. The instrument is also common in the banking sector: after the 2008 financial crisis, several major banks used similar instruments to quickly strengthen their capital base and meet regulatory requirements.

Anyone reading in business news that a company has issued 'mandatory convertibles' or 'mandatory convertible notes' has generally encountered MCPS or related instruments. The crucial difference from a regular convertible bond is the mandatory element: with a regular convertible bond, the holder can decide for themselves whether to convert. With MCPS, they have no such choice.