The Lumpeninvestoriat is a term used by financial pundits, especially online but also in the printed press, as a reference to the masses of common investors.

The word is combination of lumpenproletariat and investor. It is often applied by contrarian writers in a derogatory sense, with the implication that the masses of investors tend to blindly follow trends without regard to the underlying dynamics of the financial markets, often with long-term disastrous results.