NEW YORK (AP) — Stocks that traded heavily or had substantial price changes on Monday:

Boeing Co., down $20 to $229.

Some Boeing 737 Max jetliners are grounded after an Alaska Airlines plane suffered a blowout that left a gaping hole in the side of the fuselage.

Chesapeake Energy Corp., down 45 cents to $78.76.

The energy company is reportedly close to a merger deal with Southwestern Energy.

Alaska Air Group Inc., down 8 cents to $37.87.

Cancellations mounted at the airline after one of its jets suffered a blowout that left a gaping hole in the side of the fuselage.

Harpoon Therapeutics Inc., up $11.81 to $22.36.

Merck is buying the drug developer for about $680 million.

Axonics Inc., up $11.79 to $69.36.

Boston Scientific is buying the medical device company for about $3.7 billion.

Ansys Inc., up $4.55 to $348.63.

Synopsis is reportedly in talks to buy the maker of engineering-simulation software.

Ambrx Biopharma Inc., up $13.84 to $27.47.

Johnson & Johnson is buying the drug developer for about $2 billion.

Exxon Mobil Corp., down $1.71 to $100.92.

Energy companies fell along with crude oil prices.

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