Lockheed Martin (NYSE: LMT) is buying cyber security group Industrial Defender.

Industrial Defender, headquartered in Foxborough, Mass., provides cyber security services for control systems in the oil and gas, utility and chemical industries. The deal is expected to close in 30 days, and terms were not disclosed.

The deal is aimed at expanding Lockheed Martin's commercial cyber security business. Bethesda, Md.-based Lockheed provides research, design, development, manufacturing, integration and sustainment of advanced technology systems and products for the security and aerospace industries.

The deal comes at a busy time for M&A in the cyber security industry. In March, investment firm Blackstone (NYSE: BX) bought a majority stake in Accuvant Inc., which provides information security services. In November, private equity firm GTCR sold Six3 Systems Inc., which provides services to the intelligence community, to CACI International Inc. (NYSE: CACI). Not all companies in the cyber security sector are thriving - including ISC8, a cyber security company on Mergers & Acquisitions Distressed Company Watch List. For more, see "Turnaround Tuesday: Cyber Security Group ISC8 Needs to Raise Funds."

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