overallotment
/ˌəʊv(ə)rəˈlɒtm(ə)nt/Finance
noun
The selling of securities additional to those available in the first issue of a company's stock.
- overallotment option noun an option whereby, for a fixed period after an initial issue, an underwriter may purchase a limited quantity of additional stock, especially to meet unforeseen demand by investors..
Origin
1980s; earliest use found in PR Newswire. From over- + allotment.