Stocks making the biggest moves midday: Berkshire Hathaway, Micron, Tyson Foods, Spirit Airlines and more

In midday trading, notable stock movements included Berkshire Hathaway, which saw a 0.6% increase following strong first-quarter results and an annual meeting. Micron Technology also rose by 4.5% after an analyst upgrade due to positive trends in DRAM pricing. Conversely, Spirit Airlines dropped 9% after reporting a quarterly loss greater than expected.

Other significant movements were seen in Paramount shares, which climbed 3.3% amid news of acquisition talks, while Medical Properties Trust fell nearly 7% due to a major tenant's bankruptcy. Additionally, EHang Holdings surged 9% after an optimistic analyst initiation, and Tyson Foods declined by 6% despite beating earnings estimates, as its revenue fell short.