** Shares of amusement park-resort operator Six Flags Entertainment FUN.N up 5.1% at $26.66 in premarket after activist investor Jana Partners discloses 9% stake and teams up with NFL star Travis Kelce
** Stock set to open at highest level since 22 August
** The 9% stake makes Jana third-largest shareholder in FUN, behind BlackRock Institutional Trust Company and The Vanguard Group
** Kelce, a theme park “superfan,” could be potential board nominee
** Jana joins a field of activist investors approaching Six Flags with ideas for how to boost share price
** Jana sees opportunity to increase park attendance, brand engagement through fresh marketing strategy
** 12 analysts rate stock "buy" or higher, three rate it "hold"; median PT at $31.50 - LSEG
** FUN shares down 46.81% YTD
(Reporting by Tharuniyaa Lakshmi in Bengaluru)
((tharuniyaa@thomsonreuters.com))