A sign is posted in front of a Broadcom office in San Jose, California, on June 3, 2021.

Check out the companies making headlines in midday trading.

Cisco Systems, Splunk — Shares of Cisco fell 3.9% Thursday after the company said it is acquiring cybersecurity software company Splunk for $157 per share in a cash deal worth about $28 billion. Splunk's stock price popped 19.1% on news of the deal.