Tsakos Energy (TNP) shares ended the last trading session 13.7% higher at $9.79. The jump came on an impressive volume with a higher-than-average number of shares changing hands in the session. This compares to the stock's 14.3% gain over the past four weeks.Global oil tanker rates have surged due to the concerns about oil supplies from Russia, which is one of the world's largest producers of the commodity. This has followed the invasion of Ukraine by Russia. The overall optimism surrounding the shipping industry as economic activities gradually gather pace is also aiding the stock. Evidently, shares of Tsakos Energy Navigation Limited surged in excess of 35% year to date.This oil and gas shipping company is expected to post quarterly loss of $0.61 per share in its upcoming report, which represents a year-over-year change of +68.1%. Revenues are expected to be $99.63 million, up 8.6% from the year-ago quarter.Earnings and revenue growth expectations certainly give a good sense of the potential strength in a stock, but empirical research shows that trends in earnings estimate revisions are strongly correlated with near-term stock price movements.For Tsakos, the consensus EPS estimate for the quarter has remained unchanged over the last 30 days. And a stock's price usually doesn't keep moving higher in the absence of any trend in earnings estimate revisions. So, make sure to keep an eye on TNP going forward to see if this recent jump can turn into more strength down the road.The stock currently carries a Zacks Rank #3 (Hold). You can see the complete list of today's Zacks Rank #1 (Strong Buy) stocks here >>>>Tsakos belongs to the Zacks Transportation - Shipping industry. Another stock from the same industry, Costamare (CMRE), closed the last trading session 2% higher at $14.45. Over the past month, CMRE has returned 6%.Costamare's consensus EPS estimate for the upcoming report has changed +2.5% over the past month to $0.88. Compared to the company's year-ago EPS, this represents a change of +225.9%. Costamare currently boasts a Zacks Rank of #2 (Buy). Just Released: Zacks Top 10 Stocks for 2022 In addition to the investment ideas discussed above, would you like to know about our 10 top picks for the entirety of 2022? From inception in 2012 through 2021, the Zacks Top 10 Stocks portfolios gained an impressive +1,001.2% versus the S&P 500’s +348.7%. Now our Director of Research has combed through 4,000 companies covered by the Zacks Rank and has handpicked the best 10 tickers to buy and hold. Don’t miss your chance to get in…because the sooner you do, the more upside you stand to grab.See Stocks Now >>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 Tsakos Energy Navigation Ltd (TNP): Free Stock Analysis Report Costamare Inc. (CMRE): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research