WASHINGTON — The Securities and Exchange Commission is investigating the startup behind one of the biggest cryptocurrency exchanges, as regulators probe further into parts of the digital-asset market that have resisted oversight, according to people familiar with the matter.

Regulators are examining Uniswap Labs, the main developer of the world’s largest decentralised exchange, called Uniswap, the people said. Enforcement attorneys are seeking information about how investors use Uniswap and how it is marketed, the people said.