BUZZ-AC Immune Ltd: Drops on block sale

** Shares (Berlin: DI6.BE - news) of Swiss biotech AC Immune (NasdaqGM: ACIU - news) down 6.7 pct to $10.79 in light premarket trading on block sale

** Sources say Jefferies re-offered 1.9 mln shares at $11, roughly 5-pct discount to stock's $11.57 last sale on Thurs; seller(s) not known at this time

** AC Immune went public in Sept at $11/sh; IPO lockup expired on Mar 21

** ACIU backed by German billionaire Dietmar Hopp, top holder with 18 mln shares, or 32-pct stake. Swiss-based VC firm Varuma AG next biggest with 11.4 mln shares (20 pct) followed by Fidelity Management with 3.6 mln shares (6.3 pct)

** Last month, AC Immune's partner, Roche, said it was starting a second late-stage trial of Alzheimer's drug crenezumab, shrugging off failures of similar drugs against the memory-robbing disease

** Roche announcement came same day that Nestle SA -backed Accera's drug failed a late-stage study

** Upcoming trial results on Axovant's Alzheimer's compound is the next highly anticipated readout for the disease