By Dana Mattioli And Dana Cimilluca 

After years in the doldrums, the mergers-and-acquisitions market came roaring back to life last year. Whether the surge will continue depends largely on the ability of that recovery to widen beyond a narrow group of industries that led the charge in 2014.

More than $3.4 trillion of mergers were struck globally last year, according to Dealogic, as confidence returned to boardrooms and high stock prices emboldened buyers and sellers. That is the most since the height of the last deal boom in 2007, when there was a record $4.3 trillion of transactions. In the U.S., deal activity surged 54% to $1.5 trillion in 2014.

The year was flush with blockbuster deals, including Actavis PLC's $66 billion agreement to buy Botox maker Allergan Inc., the largest of the year; AT&T Inc.'s $49 billion proposed takeover of DirecTV; and Comcast Corp.'s $45 billion deal to acquire Time Warner Cable Inc.

But those and a number of the other big-ticket deals in 2014 were confined to the health-care, telecommunications, media and technology sectors, with other industries that traditionally have been big M&A contributors lagging behind.

Those areas together accounted for more than $1 trillion of announced deals globally in 2014, or nearly one-third of total volume, according to Dealogic. In 2007, they accounted for about one-sixth of overall volume. Meanwhile, financial companies made up 5.9% of 2014's activity, down from 15% in 2007, as regulatory pressure and other factors tempered deal makers' enthusiasm.

Some bankers and lawyers who arrange deals for a living say the ingredients are in place for more industries to join the party in 2015.

Michael Carr, the head of Americas M&A at Goldman Sachs Group Inc., expects that companies across a wider swath of the spectrum will face shareholder pressure to do deals that boost earnings growth as the economy picks up steam and so-called self-help measures, like share buybacks and cost cutting, run their course.

"Shareholder expectations about growth are higher than they have been in a long time," he said.

Another factor that could ignite deal making in other sectors is that, in bull markets, when one deal is struck it is often followed by others, as industry competitors react to a changing landscape.

"The psychology of deal making is that if other people are striking deals, you better strike them, too. Otherwise, you get left behind," said Alison Ressler, an M&A lawyer at Sullivan & Cromwell LLP.

Some deal makers point to the sharp decline in oil prices as another potential catalyst, as companies whose revenue stands to be dented by the drop potentially look to find merger partners to help fortify themselves.

Deal making in the energy sector has recently shown signs of life. In November, with the crude-price tumble in full swing, Halliburton Co. agreed to buy rival oil-field-services company Baker Hughes Inc. for $35 billion. Some advisers caution that more such deals are unlikely before oil prices stabilize.

Some of the sectors that registered strong gains in 2014 are expected to keep up the pace in 2015.

So-called convergence among big media and telecom companies--which are increasingly competing to offer bundles of data, video and voice services--was a big driver of M&A activity in 2014, as companies like AT&T and Comcast sought deals to help position themselves for the new landscape.

"There's been a lot of talk about convergence for 15 years, but in the last year, it's finally proving to be reality," said Woody Young, the co-head of global telecommunications, media and technology at investment bank Lazard. "That's what's driven all these enormous deals, and will continue to in the future."

Health care may have a harder time matching last year's pace.

One of the main M&A engines in the sector in 2014 was a move by companies to improve tax efficiency through deals known as inversions, in which a U.S. company buys a foreign rival in a move to redomicile abroad.

Including those that fell apart, more than half of the $648 billion of health-care deals announced in 2014 were inversions, according to Dealogic. They include medical-device maker Medtronic Inc.'s $42.9 billion pending acquisition of Ireland's Covidien PLC.

Deal makers say that pace is unlikely to continue after the Treasury Department implemented rules that make such deals less profitable. The new rules already have led a number of planned inversions to unravel, including AbbVie Inc.'s $54 billion agreement to buy Shire PLC.

David Benoit contributed to this article.

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