First Advantage slides on Silver Lake's $327 mln share offload

** Shares of employment background screener First Advantage FA.O down 9.3% at $21.33 premarket on Tues after $327 mln secondary offering prices

** FA announces sale of 15 mln shares by investment funds of Silver Lake at $21.80, a 7.3% discount to stock's last close

** Prior to offering, private equity firm Silver Lake owned ~73.5 mln shares, per LSEG data; that equates to roughly 43% of FA's ~171.97 mln shares outstanding

** Barclays and JP Morgan are underwriters for offering

** In Aug, Silver Lake reduced its stake in the Atlanta, Georgia-based firm in secondary offering priced at $22.20

** Through Mon, FA shares up 62% YTD, including ~24% gain over the past month

** Avg rating of 11 analysts is "buy"; median PT $26.50, per LSEG data