Employees at red-hot startups like Uber and Pinterest will soon be able to cash in their shares. Here are the 5 companies whose lockup expirations could spark a flood of selling.

Ticker: PINS

Lock-up expiration date: October 15

Return since IPO: 5.25%

Ticker: ZM

Lock-up expiration date: October 15

Return since IPO: 16.4%

Ticker: BYND

Lock-up expiration date: October 29

Return since IPO: 104.1%

Ticker: UBER

Lock-up expiration date: November 6

Return since IPO: (-30.5%)

Ticker: WORK

Lock-up expiration date: December 17

Return since IPO: (-37%)