Alcoa (AA) shares are up 64 cents to $13.10 and by far the best percentage gainers in the Dow Jones Industrial Average Thursday morning. Briefing attributes the relative strength to “positive Tier 1 firm commentary”. In the options market, 69K calls already traded on the aluminum maker — or 8X the expected and more than 7X the number of puts. It includes a buyer of 20K June 14 calls at 40 cents, tied to 700K shares at $13.23 (adjusted). More than 43K now traded. June 13 calls, which saw a large opening buyer of 19K at 43 cents yesterday (also tied), have traded another 3000X. May 13 and 14 calls are seeing interest as well. Implied volatility is down about 2.5 percent to 43.