In October 1996, Extreme Networks acquired Mammoth Technology.
Extreme Networks acquired Optranet in February 2001 and Webstacks in March 2001. Extreme had invested in both companies, which were purchased for about $73 million and $74 million respectively.
On September 12, 2013, Extreme Networks announced it would acquire Enterasys Networks for about $180 million.
On October 31, 2016, Extreme Networks announced that it completed the acquisition of Zebra Technologies' wireless LAN business for about $55 million.
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On March 7, 2017, Extreme Networks announced its intention to acquire Avaya's networking business in a transaction valued at $100 million. The acquisition officially closed on July 17, 2017. As part of this transaction, Extreme acquired customers, personnel, and technology assets from Avaya. Extreme has publicly stated that it expects to "generate over $200 million in additional annualized revenue" from the acquired networking assets from Avaya.
On March 29, 2017, Extreme Networks announced its intention to acquire Brocade's SRA (Switching, Routing, and Analytics) business from Broadcom for an undisclosed sum. The acquisition officially closed on October 30, 2017, and with it, Extreme acquires customer relationships, personnel, and technology assets from Brocade including the SLX, VDX, MLX, CES, CER, Workflow Composer, Automation Suites, and certain other Data Center related products. Extreme has publicly stated that it anticipates "the transaction will generate over $230 million in additional annualized revenue from the acquired assets".
On June 26, 2019, Extreme Networks announced its intention to acquire Aerohive Networks for $272 million. Aerohive's cloud-managed portfolio of wireless, LAN, and SD-WAN products is well-regarded in the industry. The acquisition was completed on August 9, 2019, at an aggregate purchase price of approximately $272 million.
On September 15, 2021, Extreme Networks acquired Infovista's Ipanema SD-WAN business.
