Moderna's Rollercoaster: $45B Surge, $18B Crash, and a Vaccine That Changed Everything

$63 billion — that's the combined swing in Moderna's market value in just two trading sessions, a whiplash event that became the defining story of the week on Wall Street.

Money Moves

• Moderna (MRNA) — Stock plunged 25% on Thursday, erasing $18 billion in market value, one day after soaring 177% on cancer vaccine trial success.
• Walmart (WMT) — Tumbled 9% after same-store sales grew only 2.6%, missing the 3.5% analyst estimate,...