The December edition of the list of Boston tech M&A announcements may not be as long as it was in November, when we tracked 13 deals. However, the last month of 2017 was full of significant happenings, including… well, one of the biggest Boston tech acquisition of the year (Cayan acquired by TSYS for $1.05 billion).

In addition, in mid-December Axios reported that Amazon is in “advanced” talks to buy Sqrrl, a Cambridge-based cybersecurity software company with roots in the NSA. “Word is that the purchase price would be a bit north of $40M,” Dan Primack and Kia Kokalitcheva wrote.

Here are the BostInno Departed from December 2017:

The Shuttered:

• Lexumo, an Internet of Things security startup spun out of Draper Labs, shut down in September, Xconomy reported. “We needed to renegotiate the terms of our IP/licensing agreement to conserve capital and make the company more attractive to future investors and potential acquirers,” CEO Dan McCall told Xconomy. “This entailed a significant effort that I’m sad to say did not succeed.”

The Merged and Acquired:

• New Valance Robotics, a Boston-based 3D printing startup, has been acquired by an Ohio-based machine tool manufacturer called Cincinnati, Inc. Terms of the deal were not disclosed.

• Senet has entered into a definitive agreement to sell its Hudson, N.H.-based fuel delivery and monitoring solution, EnerTrac, to the WESROC division of Independent Technologies. Financial terms weren’t disclosed.

• Boston-based Iron Mountain has agreed to acquire the U.S. operations of IO Data Centers LLC for $1.315 billion, plus up to $60 million based on future performance and subject to customary adjustments. With the transaction, Iron Mountain will acquire the land and buildings associated with data centers in Arizona, New Jersey and Ohio.

• Synopsys has completed its acquisition of Burlington-based open source cybersecurity company Black Duck Software, which was announced in early November. The value of the cash transaction was approximately $547 million net of cash acquired.

• Cayan, a payment processing company that has been around the Boston fintech scene for the last 19 years, is in the process of getting acquired by Total System Services – best know as TSYS – in an all-cash transaction valued at approximately $1.05 billion and expected to close in the first quarter of 2018. The deal ranked No. 1 in 2017’s top Boston tech acquisitions.

• Right before Christmas week, BBJ and The Boston Globe reported that e-commerce giant Amazon has scooped up home security camera maker Blink. Andover-based Blink, which operated under the name Immedia Semiconductor, had raised over $1 million in a 2014 Kickstarter campaign and brought in about $20 million in venture funding from Flybridge Capital Partners, Comcast and Akamai.

If you think there’s a startup missing from this list,

email me at lmaffei@americaninno.com