tranchette
noun[C]
uk/trɑːnʃˈet/usFINANCE,STOCK MARKET
asmallnumberofsharesthat issoldinadditionto a muchlargernumberthat has already been madeavailableforsale:
Thebidsreceivedwere 2.28timestheamountofstockonoffer, so thebankannouncedtheissueof three new tranchettes oftapstock.