SAN FRANCISCO (Reuters) – Just four months after Apple Inc (AAPL.O) breached the $1 trillion mark, the iPhone maker has all but lost its lead as Wall Street’s most valuable company and is on the verge of being replaced by Microsoft Corp (MSFT.O).

Buoyed by a broad rebound in U.S. stocks on Monday, Microsoft jumped 3.11 percent to $106.28, pushing its market capitalization up to a record $816 billion at mid-day. At the same time, shares of Apple rose 0.63 percent, leaving its stock market value at $823 billion.

Earlier, Apple’s stock fell, and both companies’ market capitalization were within about $3 billion of each other, putting them at virtually the same value.

(Graphic: Microsoft vs Apple in market cap – tmsnrt.rs/2RaGujz)

Technology shares have been punished in recent months as investors worry about rising interest rates and fallout from a trade conflict between the United States and China.

But Apple has suffered more than other Silicon Valley stalwarts, down 23 percent since it warned on Nov. 1 that sales for the crucial holiday quarter would likely miss Wall Street expectations.

Global demand for smartphones has slowed in recent years, making it more difficult for Apple to increase its revenue.

Apple’s market capitalization overtook Microsoft’s in 2010 as the maker of Windows software struggled with slow demand for personal computers, due in part to the explosion of smartphones driven by the iPhone.