| Albert Jerka,|
AZ.pl was founded in 1996 in Stettin, Poland. In 2010, the majority of AZ.pl was taken over by Key-Systems. The company is has the third largest registration of Polish domains, with more than 10% of the market and over 240,000 domains. The company offers a large variety of services such as domain name registration, email accounts and site-building tools.
AZ.pl is the first ICANN accredited registrar in Poland and as of 2010 it ranked as the third most prominent registrars of the Polish .pl ccTLD, with 10% of the market. At that time it was administering some 240,000 domains.
The acquisition of a majority stake of AZ.pl by Key-Systems was self-described as a move to more firmly establish themselves in the the Eastern European market and also further bolster their international presence as a whole, given that around that time in 2010 the company had also acquired subsidiaries in the USA and Mexico. The move allowed AZ.pl to increase its domain extension offerings by more than 200 TLDs. 
For a comparative breakdown of the extension that their customers are registering with AZ.pl, see here.