One agreement for a US public company acquisition with a deal value of $100 million or more was filed this past week.

On April 10, 2014, AMETEK, Inc. agreed to acquire Zygo Corporation, a supplier of optical metrology instruments, precision optics and electro-optical design and manufacturing services, in an all-cash transaction with an enterprise value of $280 million, including Zygo's outstanding equity awards and net cash acquired.

Under the merger agreement, Zygo may not solicit competing proposals, subject to a standard fiduciary out in response to a superior proposal or an intervening event. The merger agreement's definition of intervening event specifically excludes the results of the introduction of new or modified products or the results of sales or marketing initiatives (including any resulting

increase in sales) to the extent they are reasonably foreseeable. Additionally, if the merger agreement is terminated under certain circumstances, Zygo must pay to AMETEK a break-up fee of $8.6 million (3.07% of the deal value), including if Zygo enters into a superior proposal, changes its recommendation or materially breaches its stockholders' meeting or no-shop covenants.

For additional public merger agreement summaries, see What's Market.