I had to Google it: > A greenshoe option is an over-allotment option. In the context of an initial public offering (IPO), it is a provision in an underwriting

I had to Google it: > A greenshoe option is an over-allotment option. In the context of an initial public offering (IPO), it is a provision in an underwriting agreement that grants the underwriter the right to sell investors more shares than initially planned by the issuer if the demand for a security issue proves higher than expected. https://www.investopedia.com/terms/g/greenshoe.asp https://www.investopedia.com/terms/g/greenshoe.asp