INDIANAPOLIS and BLOOMINGTON, Ind. -- The U.S. stock market and billionaire Wall Street investment firms are reeling from share price volatility of struggling retail stocks such as AMC, BlackBerry and GameStop. The value of GameStop surged a staggering 1,700 percent since December, with the majority of that increase occurring in the past several days. The meteoric rise, driven primarily by amateur investors on social media using consumer stock-trading apps, has triggered multiple brief stops in trading due to market volatility and destabilized a hedge fund that bet against the stock’s rise; federal regulators are said to be monitoring the situation. Most recently, consumer trading services Robinhood, TD Ameritrade and Charles Schwab have moved to limit trading on GameStop and other stocks, sparking outcry in some sectors. IU experts on global financial markets, stock values, risk and investing are available to comment.

Steve L. Jones

Expertise: Asset valuation, corporate finance, financial markets, investment management.

Steve Jones is a professor of finance in the IU Kelley School of Business on the IUPUI campus. His scholarly interests include corporate finance, financial markets and investment management.

Todd Roberson

Expertise: Social and commercial entrepreneurship, enrollment management, international finance, business development, community engagement, public speaking, personal finance.

Todd Roberson teaches upper-division courses in corporate finance, international finance and strategic business analysis in the Indiana University Kelley School of Business Indianapolis. Prior to his academic career, he was the creative director and chief financial officer of a large advertising and communications agency in Denver.

Charles Trzcinka

Expertise: International stock market liquidity measures; asset management.

Charles Trzcinka, who holds the James and Virginia Cozad Chair of Finance at the Indiana University Kelley School of Business, is an expert on financial markets and investments. He has published numerous scholarly articles in the best finance journals, including four award-winning articles, and is frequently quoted on matters pertaining to individual investors