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The year was supposed to be a boom time for mergers and acquisitions in the tech sector. But that’s not how it’s turning out.

After a surge of activity in the first quarter, tech M&A activity slowed markedly in the second quarter, both in terms of the number of deals and in their combined value, consulting firm PwC detailed in a new report. Thanks to the slowdown, there were 8% fewer announced deals in the first half of this year as there were in the first half of 2017.

The dropoff can be attributed to a collection of factors, including increased regulatory scrutiny and growing international trade tensions.

Here’s how the tech M&A market changed in the second quarter and why: