FactSet Research Systems (FDS), which supplies many Wall Street firms with data and research, produced a massive free cash flow (FCF) result in its latest quarter. If this keeps up, FDS stock could be deeply undervalued. FDS closed at $423.73 on Friday. I estimate the stock is worth at least 68% more at $712 per share. This article will show why. The company’s results for its fiscal Q3, released on Friday, June 21, show that it had a massive gain in free cash flow and FCF margins. This augurs well for the company’s valuation from now on. Free Cash Flow SurgingThe company’s revenue rose 4.3% fr…