Check out the companies making the biggest moves midday: Miami International Holdings — The parent of Miami-based exchange operator MIAX surged more than 43% in its public market debut at the New York Stock Exchange. The company priced its initial public offering at $23 per share. It last traded above $31. Paramount Skydance — The media company fell more than 6%, giving back some of Wednesday’s stunning surge. Paramount rallied 37% in the previous session, marking its best day ever. Amcor — The packaging company plummeted more than 14% after its fiscal fourth-quarter results missed analysts’ estimates. The company earned 20 cents per share on revenue of $5.08 billion. That’s below the StreetAccount consensus of 22 cents per share in earnings and $5.19 billion in revenue. Its full-year guidance was also soft. SiTime — The tech equipment maker rose more than 1% after UBS initiated coverage with a buy rating and a price target that signals about 20% upside from Wednesday’s close. “SiTime’s leadership position within the MEMS timing market has led to design wins at Apple and NVDA that we believe are catalysts for 36%/30% Y/Y total revenue growth in CY26/CY27e,” UBS said. Advance Auto Parts — Shares fell more than 9% after the auto parts retailer slashed its 2025 outlook. Advance Auto expects to earn between $1.20 and $2.20 per share …
