October 20, 2026: Top Stock Gainers Surge on Company Developments and Heavy Volume

On October 20, 2026, several stocks recorded substantial gains on unusually heavy trading volume.

WISeSat.Space Holdings (NASDAQ: SAIQ) jumped approximately 100.6% to $6.84, with about 53.5 million shares traded in the cited snapshot. The company announced that a new FOSSA 6U satellite had launched aboard a SpaceX Falcon 9, creating opportunities to test WISeSat and SEALSQ cybersecurity technologies against emerging cyber and quantum threats.

Alpha Technology Group (NASDAQ: ATGL) climbed approximately 50% to $6.93, with about 1.4 million sharestraded—far above its recent average. The company provides cloud-based IT and enterprise software services, but no new company announcement clearly explained the day’s move.

Braze (NASDAQ: BRZE) rose 51.7% to $45.57 on approximately 64.6 million shares. Salesforce entered a definitive agreement to acquire Braze for $47.50 per share in cash, valuing the transaction at approximately $5.66 billion in enterprise value. The deal remains subject to shareholder and regulatory approvals.

Myriad Genetics (NASDAQ: MYGN) advanced 31.6% to $5.54, with about 23.8 million shares traded. Myriad agreed to sell its prenatal health testing business to Labcorp for $210 million in cash, plus the value of the unit’s inventory at closing. The transaction is expected to close in early 2027, subject to regulatory approval and customary conditions.

Lionsgate Studios (NYSE: LION) gained 14.4% to $12.15 on approximately 14.3 million shares. The move followed a report that Legendary Entertainment had submitted a takeover bid for Lionsgate. Neither company had publicly confirmed the reported offer, and no proposed price was disclosed.

Most of these gains had identifiable company-specific catalysts. The main exception was Alpha Technology Group (NASDAQ: ATGL), whose sharp increase appeared driven primarily by unusually heavy trading in a thinly traded stock.