Dynavax Technologies Stock Soars on Buyout Buzz

The stock is heavily shorted

Laura McCandless

Deputy Editor

Dec 24, 2025 at 11:55 AM

SNY
DVAX

Biotech stock Dynavax Technologies Corp (NASDAQ:DVAX) is soaring today, last seen up 38.7% at $15.43, after reports that Sanofi (SNY) plans to acquire the company in an all-cash deal worth roughly $2.2 billion. The acquisition is expected to close in the first quarter of 2026.

Trading at fresh three-year highs, today's bull gap has DVAX on track for its largest single-day percentage gain since February 2021. The shares are breaking into positive territory for the year, now up 20.8% year to date.

Short covering could be exacerbating today's gains, as short interest represents a sizeable 12.3% of the stock's available float. It would take shorts nearly nine days to buy back their bearish bets, at DVAX's average pace of trading.

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