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The worldwide cybersecurity market continues to grow and grow as defined by market sizing estimates that range from $75 billion in 2015 to $170 billion by 2020.

The data comes from consolidated estimates by IT industry research and analyst firms, including these figures:

A report by Visiongain, a business intelligence firm in London, indicates that the global cyber security market is set to be worth $75.4 billion in 2015, as high-demand continues for information security solutions.
Research firm Gartner projects that the world will spend $101 billion on information security in 2018.
The cyber security market is estimated to grow to $170 billion (USD) by 2020, at a Compound Annual Growth Rate (CAGR) of 9.8% from 2015 to 2020, according to a report from Markets and Markets. The aerospace, defense, and intelligence vertical continues to be the largest contributor to cybersecurity solutions.
North America and Europe are the leading cybersecurity revenue contributors, according to a report from TechSci Research in Burnaby, Canada. Asia-Pacific is rapidly emerging as a potential market for cyber security solution providers, driven by emerging economies such as China, India and South-East Asian countries, wherein, rising cyber espionage by foreign countries is inducing the need for safeguarding cyber space.
Million dollar plus cybersecurity deals (vendors selling to end-users) are on the rise. In a recent research note, analysts at FBR & Co., an investment banking and M&A advisory firm, indicate that the number of seven-figure (cybersecurity) deals have increased by 40% year-over-year.
According to IDC, the hot areas for growth are security analytics (SIEM) (10%); threat intelligence (10%+); mobile security (18%); and cloud security (50%).
What explains the continual growth on cybersecurity spending? Cybercrime. According to Lloyd's of London, cybercrime is costing businesses up to $400 billion annually. As cybercrime rises, corporations and governments increase spending to defend and protect their digital networks and assets.

Cybercrime is also fueling demand for cyber insurance, a market that is growing alongside cybersecurity products and services. Last year, the insurance industry generated about $2.5 billion in premiums on policies to protect companies from losses as a result of cyber-attacks. That was up from around $2 billion a year before, and less than $1 billion two years before that.

By region

The cybersecurity market continues to grow in international regions, as evidenced by the figures below - which are published by MicroMarketMonitor:

The Europe Cyber Security Market is expected to grow to $35.53 billion by 2019, with an expected CAGR of 7.2% for the period 2013-2019. This market contributes 26.95% of the global market and will slightly fall down to 22.81% by 2019.
The Middle East and Africa Cyber Security Market is expected to grow to $13.43 billion by 2019, with an expected CAGR of 13.7% for the period 2013-2019. This market contributes 7.19% of the global market and will slightly grow to 8.62% by 2019.
The Asia Pacific Cyber Security Market is expected to grow to $32.95 billion by 2019, with an expected CAGR of 14.1% for the period 2013-2019. This market contributes 17.21% of the global market and will slightly grow to 21.16% by 2019.
The Latin America Cyber Security Market is expected to grow to $11.91 billion by 2019, with an expected CAGR of 17.6% for the period 2013-2019. This market contributes 5.18% of the global market and will slightly grow to 7.65% by 2019.
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A careful look at the numbers indicates the EMEA market (Europe, Middle-East, and Africa) is expected to contribute approximately 35% of overall cybersecurity spending by 2019. Latin America is the fastest-growing region, and expected to grow more than twice as fast as the European market through 2019.

While non-U.S. cybersecurity markets are growing, they are relative new entrants when it comes to cyber insurance. Fortune recently reported that about 90% of cyber insurance is being purchased by U.S. firms, leaving other companies around the world exposed.

Largest security vendors

Gartner recently listed the top five security software vendors by 2014 revenues (USD), market share, and growth. IBM leads the pack with a 17% growth rate, more than three times the nearest competitor.

The top five by revenues, according to Gartner:

Symantec with $3.69 billion in revenues, 17.2% market share, and a (- 1.3%) decline in growth
Intel Security with $1.825 billion in revenues, 8.5% market share, and 4.5% growth
IBM Security with $1.486 billion in revenues, 6.9% market share, and 17% growth
Trend Micro with $1.052 billion in revenues, 4.9% market share, and a (-5.9%) decline in growth
EMC (includes its RSA business) with $798 million in revenues, 3.7% market share, and 5% growth
IBM Security grew three times faster than the entire cybersecurity market in 2014.