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

WestRock Co., down $2.55 to $44.12.

The paper and packaging company said a ransomware attack impacted its operational and information technology systems.

F5 Networks Inc., up $2.93 to $207.25.

The software company completed its $500 million buyout of cloud-computing technology company Volterra.

Moderna Inc., up $15.98 to $147.

The biotechnology company said studies show that its COVID-19 vaccine works against mutated strains of the virus.

Kimberly-Clark Corp., up $4.30 to $136.51.

The maker of Huggies diapers and Kleenex tissue announced a $5 billion stock buyback program after reporting solid fourth-quarter earnings.

Cleveland-Cliffs Inc., up 18 cents to $16.58.

The mining company gave investors an encouraging update on its fourth-quarter financial results.


Cardtronics Plc., down $2.05 to $38.81.

The ATM operator is being bought by NCR for about $1.7 billion.

AMC Entertainment Holdings Inc., up 91 cents to $4.42.

The movie theatre operator raised $917 million and said any talk of imminent bankruptcy is off the table.

Carnival Corp., down $1 to $19.22.

The cruise line operator said operations for Carnival Magic, Carnival Paradise and Carnival Valor will be delayed until November.