Shares of Workhorse Group Inc. /zigman2/quotes/207314632/composite WKHS -5.82% soared 48% on very heavy volume Monday, putting them on track for an 8-day win streak, as the electric van maker was added to the Russell 3000 index /zigman2/quotes/210598149/delayed RUA +1.15% as of the opening bell. Trading volume was 92.3 million shares, compared with the full-day average of about 12.1 million shares. The stock has more than tripled (up 253%) during its current winning streak, lifting Workhorse's market capitalization to $1.03 billion. An 8-day win streak would be the longest since the 8-day stretched ending July 15, 2019. The company had announced last Tuesday that it had "successfully completed Federal Motor Vehicle Safety Standards" testing for its C650 and C1000 all-electric delivery vans. And Friday, ecommerce giant Amazon.com Inc. /zigman2/quotes/210331248/composite AMZN +1.90% announced a deal to buy self-driving technology company Zoox, with analysts estimating a purchase price of over $1 billion, according to an Associated Press report. Shares of other electric vehicle makers were also rising Monday, amid a broader stock market rally, but by less than Workhorse's stock. Shares of Tesla Inc. /zigman2/quotes/203558040/composite TSLA +1.99% rose 3.4%, Nio Inc. /zigman2/quotes/204905836/composite NIO +5.49% advanced 4.4% and Nikola Corp. /zigman2/quotes/208704275/composite NKLA +13.37% rallied 4.9%, while the S&P 500 /zigman2/quotes/210599714/realtime SPX +1.31% surged 1.2%.