Stocks making the biggest midday moves

Here are some of the names moving in midday trading:
$Datadog (DDOG.US)$
— Shares rallied more than 30% after the cloud company reported a third-quarter earnings and revenue beat before the bell. Datadog’s guidance for both earnings per share and revenue for the fourth quarter and the full year also exceeded expectations.
$Biomarin Pharmaceutical (BMRN.US)$
l — The pharma stock gained 11.4% after activist investor Elliott Investment Management built a stake in the company, according Reuters, citing two people familiar with the matter.
$GlobalFoundries (GFS.US)$
— The semiconductor stock added about 7% after the GlobalFoundries posted an earnings beat for its third quarter. Guidance for fourth-quarter earnings was stronger than expected, but revenue estimates missed expectations.