Here are five stocks added to the Zacks Rank #5 (Strong Sell) List today:Great Panther Mining Limited GPL operates as a precious metals mining and exploration company. The Zacks Consensus Estimate for its current year earnings has been revised 12.5% downward over the last 30 days.Merck & Co., Inc. MRK operates as a healthcare company. The Zacks Consensus Estimate for its current year earnings has been revised 10.8% downward over the last 30 days.Oblong Inc. OBLG provides multi-stream collaboration technologies and managed services for video collaboration and network applications. The Zacks Consensus Estimate for its current year earnings has been revised 5.5% downward over the last 30 days.Post Holdings, Inc. POST operates as a consumer-packaged goods holding company. The Zacks Consensus Estimate for its current year earnings has been revised 0.7% downward over the last 30 days.Qumu Corporation QUMU provides tools to create, manage, secure, distribute, and measure live and on-demand video content. The Zacks Consensus Estimate for its current year earnings has been revised 8.5% downward over the last 30 days.View the entire Zacks Rank #5 List. 5 Stocks Set to Double Each was hand-picked by a Zacks expert as the #1 favorite stock to gain +100% or more in 2021. Each comes from a different sector and has unique qualities and catalysts that could fuel exceptional growth. Most of the stocks in this report are flying under Wall Street radar, which provides a great opportunity to get in on the ground floor. Today, See These 5 Potential Home Runs >>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 Merck & Co., Inc. (MRK): Free Stock Analysis Report Great Panther Mining Limited (GPL): Free Stock Analysis Report Post Holdings, Inc. (POST): Free Stock Analysis Report Qumu Corporation (QUMU): Free Stock Analysis Report Oblong, Inc. (OBLG): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research