Today's biggest winners and losers in the stock market.

On this episode of Stock Movers:

- Boeing (BA) shares dropped after the company appears to have secured its long-awaited order from China during US President Donald Trump’s visit to the country, but whatever accord was reached remained nebulous on numbers, aircraft type and a sense of timing.

- Bill Ackman said Pershing Square has built a new stake in Microsoft (MSFT) taking advantage of a decline in the company’s share price to invest in a business that he said is stronger and more resilient than investors think. Microsoft shares rose 2.9% to $421.40 at 11:48 a.m. in New York on Friday.

- Dexcom (DXCM) shares are up 3.4% in premarket trading after the diabetes device maker gave long-term growth outlook at its Investor Day, that impressed analysts. Separately, activist investor Elliott Investment Management took a stake in the company and struck a settlement that will put two independent directors on the board.