Five Below (FIVE) sinks in the post session after announcing an 8.6M share secondary offering. All of the shares are being offered by selling shareholders, including certain members of Five Below's management team and Board of Directors. The underwriters are expected to have a 30-day option to purchase an additional 1.3M shares to cover over-allotments. FIVE won't receive any proceeds from the sale. Goldman Sachs, Barclays, Jefferies, Credit Suisse and Deutsche Bank are joint book-running managers. Shares -6% AH.