In agreement IG, never bought any shares here as I couldn't verify any transactions of 512<x<514 BTC for all June 2014 using my algorithm with date and transaction size applied to the Blockchain.info ledger.
I ran the algorithm for September 2014 as well, and there was one transaction on 9/2/14 @ 512.07 BTC, but that wallet address the BTC was transferred to currently has 0 BTC, so wouldn't matter if that was the transaction of interest. FWIW.
The fact that the item 10 statement varies at all between reports is concerning.
Any future follow-up PRs might present some opportunities, but better plays out there imo. Good luck if you have shares.