“I have, which will surprise you not a little, been speculating … in English stocks, which are springing up like mushrooms this year … and are forced up to quite an unreasonable level and then, for the most part, collapse. In this way, I have made over £400. ...

https://www.theglobeandmail.com/investing/markets/inside-the-market/article-a-history-of-the-stock-market-investments-made-by-karl-marx-and/