The trend for megadeals in US real estate continued in 2019, with 38 transactions in the sector, worth a total US$56.6 billion—but overall deal volume was down 17 percent and deal value fell 25 percent year-on-year

We focus on two H2 2019 rulings that could affect M&A transactions in the future

Dealmakers are placing more emphasis on sustainability in the context of their investment practices. This is occurring despite a lack of US federal regulation on companies' sustainability reporting.

M&A in the US oil & gas sector slowed in 2019, with 190 deals worth US$158 billion, down 38 percent in volume and 45 percent in value, mirroring steep declines in global M&A in the industry.

The healthcare sector (incorporating pharma, medical and biotech) has seen M&A valued at US$256.5 billion across 645 deals in 2019. This is a decrease of 9 percent by volume, but an increase of 121 percent by value.

Restructurings and uncertainty are hitting the US consumer sector. Retail M&A deal volume dropped 11 percent year-on-year to 459 deals, while deal value dropped 36 percent to US$76.87 billion.

Technology continued to be among the most active subsectors for US M&A in 2019, with 1,138 deals announced worth a total of US$206 billion. This represents a marginal decrease of 3 percent in volume and 7 percent in value compared to 2018 activity.

In line with the wider US M&A markets, PE deals held firm through 2019 with 1,329 buyouts, worth US$208 billion, representing a decline of 9 percent by volume, but just a 4 percent fall by value relative to 2018.

As the rest of the world backed away from the deal table, confident US corporates continued buying businesses—especially in the life sciences and TMT sectors, and particularly in the domestic market.

While global M&A fell in 2019, the US forged ahead, maintaining its year-on-year value and taking a greater share of the global deal market.

After a solid 2019, the foundations are in place for a strong start to the M&A year in 2020. The following factors are likely to heavily influence the market in the months ahead.

In terms of value, the technology and healthcare sectors—separately and, sometimes, in tandem—have ruled the M&A markets in 2019. Meanwhile, the consumer industry faced tough times—though there could be a rebound in 2020.

Aviation finance is proving its resilience amid a cooling global economy. Our survey finds that senior executives in the sector are optimistic that global levels of aircraft financing will increase in 2020.