APLS Stock Soars 140% Today – Here’s Everything To Know About Apellis' Massive $5.6B Deal With Biogen

Biogen stated that the acquisition of Apellis will bolster its rare-disease treatment portfolio and accelerate its expansion into nephrology.
Representative image of a trending stock chart.
Representative image of a trending stock chart. (Photo: Getty Images)
Profile Image
Rounak Jain·Stocktwits
Updated Mar 31, 2026   |   7:15 AM EDT
Share
·
Add us onAdd us on Google

Apellis Pharmaceuticals Inc. (APLS) shares soared 140% in Tuesday’s pre-market trade after Biogen Inc. (BIIB) announced that it has agreed to acquire the company in a $5.6 billion deal.

Biogen stated that the acquisition of Apellis will bolster its rare-disease treatment portfolio and accelerate its expansion into nephrology.

Retail sentiment on Stocktwits around Apellis Pharmaceuticals trended in the ‘bullish’ territory with message volumes at ‘high’ levels at the time of writing.

Get updates to this developing story directly on Stocktwits.

Also See: ARTL, BFRG, HKIT Among Stocks Soaring Before The Bell — Top Pre-Market Gainers Today

For updates and corrections, email newsroom[at]stocktwits[dot]com.

Follow on Google News
Read about our editorial guidelines and ethics policy