By MICHAEL LIEDTKE
AP Technology Writer
SAN FRANCISCO (AP) — Apple is now the first publicly traded company to close a trading day with a $3 trillion market value, marking another milestone for a technology juggernaut that has reshaped society with a line-up of products that churn out eye-popping profits. Apple shares finished up 2.3% at $193.97 Friday, bringing its market value to $3.04 trillion. Apple is one of a handful of technology companies, including Microsoft and chipmaker Nvidia, that helped drive the S&P 500 to a gain of nearly 16% in the first half of the year.