Because the most recent lows were caused by the market correction (IMO), I was just thinking that market related events would be prime candidates contributing to MNTA's recovery from these lows. Upgrades and addition to an index are positive market events (besides the rising PPS ). I didn't have a particular index in mind and I don't know the exact selection criteria used for particular indexes.
I was also thinking that addition to an index is not affected by the tEnox overhang (unlike analyst ratings, upgrades/downgrades).
This morning I saw that MNTA was added to the IBD 50 again. Recall that it was added earlier this year (May 9th #msg-62880906) and stayed on for 8 weeks or so (? don't remember the exact duration). It gained 10% the day after it was added. Let's hope it stays on longer this time.