A brief introduction to Kraken M&A activities:
Kraken is a digital asset exchange for crypto currencies that trades high volumes of currencies like Bitcoin, Ethereum and Ripple against the US Dollar and Euro in Europe as well as other fiat currencies in the international market. As of October 2017, they were said to have surpassed 13 million dollars a day on average trading volume, which increased from 7 million a year prior. In November 2017, Kraken was officially listed at number 12th on the global bitcoin exchange list by volume on Coinmarketcap.com, recording an increase from the 16th spot a year before.
Like other crypto exchanges, Kraken’s main source of revenue is through transaction fees. In additional to this, they offer margin trading facilities (in which investors can borrow capital at interest rates to leverage their trades) and services for professional traders with high volume at competitive rates. They also charge a fee for withdrawals in Euro or US dollars, whereas withdrawal in most other currencies is free of charge. Kraken further accepts new account applications in countries where the banking industry has been hostile towards bitcoin traders, like India and Brazil.
Since October 2017, Kraken has posted five M&A transactions:
1. The acquisition of Crypto Capital Corp. in May 2017, which led to Kraken becoming the first crypto exchange with the ability to support fiat currency trading with bitcoins, ethereum and ripple.  
2. The acquisition of Global Trading Solutions in October 2017, which helped increase the number of supported currency pairs to more than 100.
3. The acquisition of Coinsetter in February 2018; Coinsetter is based in New York and had previously been a rival competing against Kraken. This acquisition brought in 5000 new clients.
4. The acquisition of Dutch exchange CleverCoin in August 2018. This was a direct purchase from CleverCoin’s parent company, CleverPartners, rather than a stock swap or asset transfer as Kraken had done in the previous M&A deals.
5. Kraken has also announced that it intends to acquire Glidera, a cryptocurrency wallet with an open API that allows it to essentially be made compatible with any other financial service provider that uses it. This also opens up opportunities for Kraken to create point-of-sale solutions for merchants.
Recent news mentions:
Kraken has released data that shows that their customer base has expanded to over 5.5 million accounts since the announcement of its partnership with ShapeShift in February. 
In October 2018, it was announced that Kraken is affiliated with the World Crypto Assets Association .  The association comprises a maximum of six public companies , including Coinbase, Bitfinex, Bittrex and Huobi. Kraken is not listed on a list of members.
In November 2018, it was reported that Kraken had filed for a patent for its proprietary technology that will offer cryptocurrency investment options to users.
Kraken recently announced that they are going to launch margin lending service for Bitcoin Cash (BCH) and Ripple (XRP), allowing them to borrow up to 100x leverage on those currencies.