I trade options at IB, but one data point that none of their transaction / activity reports lets me easily view is what the UNDERLYING was trading at when I made an option buy/sell. IOW, in their reports, I can see that I bought a MSFT September Call on 7/18/16 at 1:08pm, but I want to know exactly where MSFT, the underlying, was trading at 1:08pm. What's best way to do that (preferably in bulk?). In Google FInance I can create a chart of MSFT for a historical day - 7/18/16 - and then view the price in 15-minute intervals by mousing over it. But I have dozens of tickers/times I want to look up at once. Is there a (free) resource that lets me put in a ticker + date/time, and will show me the SP? (even in 15-minute intervals would be fine; doesn't need to be down to the MINUTE)