When a company sells shares through an underwriter either in a secondary or an IPO, they normally grant the underwriters the right to an additional percentage of more shares if they so choose. The theoretical purpose is to allow the underwriters greater flexability to manage the price of the issue and guarantee its success by having the ability to support and/or keep the price relatively stable in its initial days once price has been set, but, in the real world, it's really more of a way to increase underwriters profit potential.
What happened with TINY is unusual. Usually, overallotment shares are granted upon request by the underwriter.... What happened here??? Why were they granted and then returned?