NZX hosts many of New Zealand's largest companies, including Fonterra Co-operative Group, which produces over 2 billion liters of milk every year and is the world's largest dairy exporter. Overseas investors owned roughly 40% of the equities market as of December 2018.DDoS attacks aim to disrupt service by flooding a network with large volumes of internet traffic. The Hong Kong Stock Exchange suffered a DDoS attack in September last year, which forced it to suspend trading, while Nasdaq, CBOE and BATS were hit by DDoS attacks for several days in 2012 resulting in patchy access to their websites but no disruptions to trading.The motive for the attack on New Zealand's stock market remains unclear and the exchange has not provided further details. How to protect yourself from cyberattacks while working from homeThis type of attack is becoming much more common, as cybercriminals capitalize on the growth in public clouds and sell their services cheaply on the dark web. DDoS attacks surged 542% in the first quarter of this year, compared to the final three months of 2019, according to cyber security company Nexusguard.''One reason why DDoS attacks are so inexpensive is that more and more people that offer DDoS-for-hire services are leveraging the scale and bandwidth of public clouds.