Cigna (CI) closed the most recent trading day at $212.73, moving +0.72% from the previous trading session. This change outpaced the S&P 500's 1.44% loss on the day. Elsewhere, the Dow lost 1.27%, while the tech-heavy Nasdaq lost 2.06%.Prior to today's trading, shares of the health insurer had gained 6.03% over the past month. This has outpaced the Finance sector's loss of 3.07% and the S&P 500's loss of 2.61% in that time.Investors will be hoping for strength from CI as it approaches its next earnings release, which is expected to be November 1, 2018. The company is expected to report EPS of $3.45, up 21.91% from the prior-year quarter. Our most recent consensus estimate is calling for quarterly revenue of $11.22 billion, up 9.28% from the year-ago period.Looking at the full year, our Zacks Consensus Estimates suggest analysts are expecting earnings of $13.87 per share and revenue of $45.38 billion. These totals would mark changes of +32.6% and +9.67%, respectively, from last year.Investors might also notice recent changes to analyst estimates for CI. These revisions typically reflect the latest short-term business trends, which can change frequently. With this in mind, we can consider positive estimate revisions a sign of optimism about the company's business outlook.Research indicates that these estimate revisions are directly correlated with near-term share price momentum. Investors can capitalize on this by using the Zacks Rank. This model considers these estimate changes and provides a simple, actionable rating system.Ranging from #1 (Strong Buy) to #5 (Strong Sell), the Zacks Rank system has a proven, outside-audited track record of outperformance, with #1 stocks returning an average of +25% annually since 1988. Over the past month, the Zacks Consensus EPS estimate has moved 0.03% lower. CI is holding a Zacks Rank of #3 (Hold) right now.Looking at its valuation, CI is holding a Forward P/E ratio of 15.23. For comparison, its industry has an average Forward P/E of 11.13, which means CI is trading at a premium to the group.We can also see that CI currently has a PEG ratio of 1.25. This metric is used similarly to the famous P/E ratio, but the PEG ratio also takes into account the stock's expected earnings growth rate. Insurance - Multi line stocks are, on average, holding a PEG ratio of 1.18 based on yesterday's closing prices.The Insurance - Multi line industry is part of the Finance sector. This industry currently has a Zacks Industry Rank of 67, which puts it in the top 26% of all 250+ industries.The Zacks Industry Rank includes is listed in order from best to worst in terms of the average Zacks Rank of the individual companies within each of these sectors. Our research shows that the top 50% rated industries outperform the bottom half by a factor of 2 to 1.Be sure to follow all of these stock-moving metrics, and many more, on Zacks.com.Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Cigna Corporation (CI): Free Stock Analysis Report To read this article on Zacks.com click here.