Natera Drops 6.6%, Shedding Nearly $4 Billion in One Session

Natera opened at $429.01 and sold off steadily through the first two hours, then consolidated near $400 for the rest of regular trading.

The closing price of $400.62 on a company valued near $57.7 billion means close to $4 billion in market capitalization was erased in a single session, which is the kind of damage that recalibrates near-term price expectations.

There was no meaningful recovery after the initial flush, leaving $429 as the level bulls need to reclaim to signal the selling has run its course.

Genetic testing companies see outsized single-day moves when sentiment shifts, given that valuations depend heavily on long-run revenue growth assumptions. A decline of this size keeps the stock in focus for any session where fresh news or a surge in volume confirms the break or sparks a reversal toward that opening price.