A downtrend has been apparent in Vir Biotechnology, Inc. (VIR) lately. While the stock has lost 6.3% over the past week, it could witness a trend reversal as a hammer chart pattern was formed in its last trading session. This could mean that the bulls have been able to counteract the bears to help the stock find support.While the formation of a hammer pattern is a technical indication of nearing a bottom with potential exhaustion of selling pressure, rising optimism among Wall Street analysts about the future earnings of this company is a solid fundamental factor that enhances the prospects of a trend reversal for the stock. Understanding Hammer Chart and the Technique to Trade ItThis is one of the popular price patterns in candlestick charting. A minor difference between the opening and closing prices forms a small candle body, and a higher difference between the low of the day and the open or close forms a long lower wick (or vertical line). The length of the lower wick being at least twice the length of the real body, the candle resembles a 'hammer.'In simple terms, during a downtrend, with bears having absolute control, a stock usually opens lower compared to the previous day's close, and again closes lower. On the day the hammer pattern is formed, maintaining the downtrend, the stock makes a new low. However, after eventually finding support at the low of the day, some amount of buying interest emerges, pushing the stock up to close the session near or slightly above its opening price.When it occurs at the bottom of a downtrend, this pattern signals that the bears might have lost control over the price. And, the success of bulls in stopping the price from falling further indicates a potential trend reversal.Hammer candles can occur on any timeframe -- such as one-minute, daily, weekly -- and are utilized by both short-term as well as long-term investors.Like every technical indicator, the hammer chart pattern has its limitations. Particularly, as the strength of a hammer depends on its placement on the chart, it should always be used in conjunction with other bullish indicators.Here's What Increases the Odds of a Turnaround for VIRAn upward trend in earnings estimate revisions that VIR has been witnessing lately can certainly be considered a bullish indicator on the fundamental side. That's because empirical research shows that trends in earnings estimate revisions are strongly correlated with near-term stock price movements.Over the last 30 days, the consensus EPS estimate for the current year has increased 95449%. What it means is that the sell-side analysts covering VIR are majorly in agreement that the company will report better earnings than they predicted earlier.If this is not enough, you should note that VIR currently has a Zacks Rank #1 (Strong Buy), which means it is in the top 5% of more than the 4,000 stocks that we rank based on trends in earnings estimate revisions and EPS surprises. And stocks carrying a Zacks Rank #1 or 2 usually outperform the market. You can see the complete list of today's Zacks Rank #1 (Strong Buy) stocks here >>>>Moreover, a Zacks Rank of 1 for Vir Biotechnology, Inc. is a more conclusive indication of a potential trend reversal, as the Zacks Rank has proven to be an excellent timing indicator that helps investors identify precisely when a company's prospects are beginning to improve. Breakout Biotech Stocks with Triple-Digit Profit Potential The biotech sector is projected to surge beyond $2.4 trillion by 2028 as scientists develop treatments for thousands of diseases. They’re also finding ways to edit the human genome to literally erase our vulnerability to these diseases. Zacks has just released Century of Biology: 7 Biotech Stocks to Buy Right Now to help investors profit from 7 stocks poised for outperformance. Recommendations from previous editions of this report have produced gains of +205%, +258% and +477%. The stocks in this report could perform even better.See these 7 breakthrough 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 Vir Biotechnology, Inc. (VIR): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research