Shares of Nio Inc. /zigman2/quotes/204905836/composite NIO -1.69% surged 3.0% in active midday trading Thursday, putting the China-based electric vehicle maker's stock on track to close at a 15-month high. Trading volume was 50.4 million shares, enough to make the stock the most actively traded on the NYSE. Helping provide support for the stock, ride-sharing company Lyft Inc. /zigman2/quotes/208999293/composite LYFT +3.35% said on Wednesday that every vehicle on its platform will be electric, or zero-emissions, by 2030. Shares of U.S.-based rival Tesla Inc. /zigman2/quotes/203558040/composite TSLA +0.62% rose 0.6% on Thursday, to trade 2.6% below the June 10 record close of $1,025.05, while Nio's stock was on track for the highest close since March 2019. Over the past three months, shares of both Nio (up 189.9%) and Tesla (up 176.4%) have nearly tripled, while the S&P 500 /zigman2/quotes/210599714/realtime SPX +0.02% has gained 29.5%.