Prospectus (Stock Market Prospectus)

When a company sells shares – i.e., stakes in itself – on the stock exchange for the first time, it must first publish an extensive document: the stock market prospectus. It contains everything a potential buyer should know before investing money. The document is legally required and is reviewed by a government authority before it may be published. In Germany, this is BaFin, the Federal Financial Supervisory Authority. A stock market prospectus is often hundreds of pages long and reads less like a marketing brochure and more like a legal opinion.

Protection for investors – and an obligation for companies

Without such a requirement, a company could tout its product on the stock exchange without discussing risks or debts. That would be like someone selling a car without mentioning that the brakes are broken. The stock market prospectus is meant to prevent exactly that. It forces the company to put even unpleasant truths down in black and white.

Anyone who provides false or incomplete information in the prospectus is liable for it. This means investors can sue the company or the accompanying bank if they lost money due to incorrect information. This liability is one of the main reasons why the prospectus is so detailed – nobody wants to end up in court later. For investors, the prospectus is thus one of the few documents whose accuracy they can legally rely on.

What’s in the prospectus – and who reviews it

A stock market prospectus follows a prescribed structure. First, there is a brief summary spanning a few pages, meant to be readable even for non-experts. Then follow detailed sections: the company’s history, its business model, its financial figures from recent years, and a list of all material risks. This risk section alone can span dozens of pages – ranging from competitive pressure and currency risks to ongoing legal proceedings.

Before the prospectus is published, the company submits it to the relevant authority. In Germany, this is BaFin; in the EU, depending on the home country, a different authority may be responsible. However, the authority does not review whether the business strategy makes sense or whether the share is worth its price. It only checks whether all required disclosures are present and complete. The substantive assessment is left to the investor.

Besides the classic IPO, there are also cases in which an already listed company issues new shares to raise fresh capital. In this case, too, a prospectus is generally required. An exception applies to small offerings below certain thresholds – here, simplified documents suffice.

Stock market prospectuses in practice – from Reddit to Porsche

Whenever a well-known company goes public, the media report on the associated prospectus. For Porsche’s IPO in 2022 – one of the largest in German history – the prospectus spanned several hundred pages. Financial journalists specifically comb through such documents for unusual risk disclosures or notable figures that the company is required to mention but does not particularly highlight.

The term also regularly appears in tech news. When an AI company announces an IPO, the prospectus is the first official source for concrete figures – such as how much revenue it actually generates or how large its losses are. Many startups are considered secretive; the stock market prospectus forces them into transparency for the first time. So anyone who wants to understand how a company is truly doing reads the prospectus – not the press release.

A stock market prospectus can usually be found free of charge on the company’s website or that of the responsible authority. As a starting point, it is worth reading just the summary and the risk section first – that’s enough to get a good picture.