Mounting concerns about the pace of growth spurred fresh declines in stocks around the world Tuesday, wiping out yearly gains for the S&P 500 and Dow Jones Industrial Average.

What started as a selloff in shares of highflying technology companies bled into other corners of the financial markets, as investors drove down prices for everything from shares of retailers and energy companies to oil and bitcoin.

The latest bout of selling left investors grappling anew with concerns that the nearly 10-year bull market could be running out of steam, even as ongoing growth in U.S. jobs, manufacturing, and corporate earnings signal to many that a recession isn’t imminent.

Traders described a hectic opening for stock trading, with some companies swinging in the first several minutes on higher-than-usual trading volumes. Amazon.com dropped 6% shortly after the open before bouncing back into positive territory. Shares then meandered lower, closing down $16.83, or 1.1%, at $1495.46.

One possible reason for those jitters: Some traders who stepped in to scoop up shares in late October, hoping for a quick rebound, are now in danger of losing those potential profits and more. That puts the stock market in a tenuous position, several said.