Merger and acquisition (M&A) activities across a number of sectors are going through the roof this year. Low interest rates, which may now last only a few days, led the companies to make the most of the easy money era in the U.S. Low interest rates make borrowing cheaper and in turn put less stress on companies’ balance sheets, post acquisition.

So far, 2015 has been a record year for the merger and acquisition activities, with November recording the highest transaction value ever globally. The value was $606.6 billion, up 7% month on month, per Dealogic.

US-based M&A volume accomplished $2 trillion for the first time. Not only in the U.S., the Asia Pacific region has seen M&A volume worth $1.05 trillion so far in 2015, up 61% from the comparable YTD last year, per Dealogic. This marked the region’s first attempt to cross the $1 trillion level. China topped the Asia Pacific M&A segment with deals worth $497 billion, up 69% year over year.

Europe also fetched M&A volume of over $1 trillion for the first time in seven years. Volume has touched $1.03 trillion so far in 2015, up 17% from the same frame in 2014. Cross-border deals grew 49% by value year over year, as noted by Dealogic.

Notably, tax inversion is among a few causes what spurred management to sign a cross-border deal. Through this method, U.S. corpoartes intend to shift their headquarters to foreign lands to evade higher American taxes while continuing operations in the home turf.

As per Wall Street Journal, global mergers and acquisitions are already at an all-time high of $4.304 trillion so far in 2015, surpassing the previous record of $4.296 trillion in 2007, while nearly half a month is still at hand. Dealogic estimates the year to end with $4.7 trillion of mergers, if the pace is maintained.

The year also made history with the number of big-ticket deals. As many as 19 U.S. deals were the size of $10 billion and above. In terms of sectors, healthcare led the way in the global M&A space followed by semiconductors.

Some Heavy Deals of 2015

The largest and hottest deal was American pharmaceutical giant Pfizer’s (PFE – Analyst Report) $160 billion acquisition of Allergen (AGN) (read: Pfizer in Talks to Buy Allergan: Prescribed ETFs).

Some other hot deals announced in 2015 (as listed by the street.com) were the H.J. Heinz and Kraft Foods Group deal worth $45.44 billion, Avago Technologies’ (AVGO – Analyst Report) intent to buy Broadcom (BRCM – Analyst Report) for $36.57 billion, AbbVie’s (ABBV – Analyst Report) $20.99 billion acquisition of cancer drug maker Pharmacyclics , Pfizer’s plan to acquire Hospira for $17.15 billon and the Netherlands-based NXP Semiconductors’ (NXPI – Snapshot Report) intent to buy Freescale Semiconductor for $16.67 billion.