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High-net-worth individual (HNWI) is a term used by some segments of the financial services industry to designate persons whose investible wealth (assets such as stocks and bonds) exceed a given amount. Typically, these individuals are defined as holding financial assets (excluding their primary residence) with a value greater than US$1 million.  
"Very-HNWI" (VHNWI) can refer to someone with a net worth of at least US$5 million. 
The Capgemini World Wealth Report 2020  defines an additional class of ultra-high-net-worth individuals (UHNWIs), those with US$30 million in liquid financial assets or with a disposable income of more than US$20 million.
As of June 2020, there were estimated to be just over 13 million HNWIs in the world. The United States had the highest number of HNWIs (4,700,000) of any country, while New York City had the most HNWIs (348,000) among cities.  .
The U.S. Securities and Exchange Commission requires all SEC-registered investment advisers to periodically file a report known as Form ADV.  Form ADV requires each investment adviser to state how many of their clients are "high-net-worth individuals", among other details; its Glossary of Terms explains that a "high-net-worth individual" is a person with at least $1,000,000 managed by the reporting investment adviser, or whose net worth the investment adviser reasonably believes exceeds $2,000,000 (or who is a "qualified purchaser" as defined in section 2(a)(51)(A) of the Investment Company Act of 1940). The net worth of an individual for SEC purposes may include assets held jointly with his or her spouse. Unlike the definitions used in the financial and banking trade; the SEC's definition of HNWI would include the value of a person's verifiable non-financial assets, such as a primary residence or art collection. 
The World Wealth Report was co-published by Merrill Lynch and Capgemini, previously known as Cap Gemini Ernst & Young who worked together since c. 1993, investigating the "needs of high-net-worth individuals" in order to "successfully serve this market segment". Their first annual World Wealth Report was published in 1996.  The World Wealth Report defines HNWIs as those who hold at least US$1 million in assets excluding primary residence and ultra-HNWIs as those who hold at least US$30 million in assets excluding primary residence.  The report states that in 2008 there were 8.6 million HNWIs worldwide, a decline of 14.9% from 2007. The total HNWI wealth worldwide totaled US$32.8 trillion, a 19.5% decrease from 2007. The ultra-HNWIs experienced the greater loss, losing 24.6% in population size and 23.9% in accumulated wealth. The report revised its 2007 projections that HNWI financial wealth would reach US$59.1 trillion by 2012 and revised this downward to a 2013 HNWI wealth valued at $48.5 trillion advancing at an annual rate of 8.1%. 
The 2018 World Wealth Report  was jointly produced by Capgemini and RBC Wealth Management and included, for the first time, the Global HNW Insights Survey produced in collaboration with Scorpio Partnership.  The inaugural survey represented one of the largest and most in-depth surveys of high-net-worth individuals ever conducted, surveying more than 4,400 HNWIs across 21 major wealth markets in North America, Latin America, Europe, Asia-Pacific, Middle East, and Africa.
The World Wealth Report has estimated the number and combined investable wealth of high-net-worth individuals as follows (using the United States Consumer Price Index (CPI) Inflation Calculator): 
Certain products cater to the wealthy, whose conspicuous consumption of luxury goods and services includes, for example: mansions, yachts, first-class airline tickets and private jets, and personal umbrella insurance.  As economic growth has made historically expensive items affordable for the middle-class, purchases have trended towards intangible products such as education.  In the United States, concierge medicine is an emerging trend as of 2017. 
Most global banks, such as Santander, Barclays, BNP Paribas, Citibank, Credit Suisse, Deutsche Bank, HSBC, JPMorgan Chase, and UBS, have a separate business unit with designated teams consisting of client advisors and product specialists exclusively for UHNWI. These clients are often considered to have characteristics similar to institutional investors because the vast majority of their net worth and current income is derived from passive sources, rather than labor.
By 2006, asset managers working for HNW individuals invested more than £300 billion on behalf of their clients. These wealth managers are bankers who in 2006, earned multimillion-pound salaries and owned their own companies and equity funds.  In 2006, a list of the 50 top investment bankers was published by the Spear's Wealth Management Survey.
Brands in various sectors, such as Bentley, Maybach, and Rolls-Royce actively target UHNWI and HNWI to sell their products. In 2006, Rolls-Royce researchers suggested there were 80,000 people in ultra-high-net-worth category around the world. UHNW individuals "have, on average, eight cars and three or four homes. Three-quarters own a jet aircraft and most have a yacht." 
The following is a list of the cities with the most HNWIs as of December 2018 as per the 2019 Global Wealth Migration Review. 
The following table shows the countries with the highest net inflow of HNWIs in 2018 and 2017 according to an annual report conducted by AfrAsia Bank in partnership with New World Wealth. The report excludes the war-torn countries of Syria, Libya and Iraq because data from those countries is unreliable. 
Caribbean includes Bermuda, Cayman Islands, Virgin Islands, St. Barts, Antigua, St Kitts & Nevis, etc. Notes: Figures rounded to nearest 1000. Source: AfrAsia Bank - Global Wealth Migration Review 2018 & 2019
The following table shows the countries with the highest net outflow of HNWIs in 2017.
Notes: Figures rounded to nearest 1000. Source: AfrAsia Bank - Global Wealth Migration Review 2018 & 2019
The Wharton Global Family Alliance (WGFA) whitepaper was released in 2008 to study the investment strategies of single family offices in the United States and in Europe.  The research was segregated into sub-groups representing those with less than $1 billion in assets and those with assets above $1 billion. The study found that U.S. families reported a more aggressive attitude toward investment objectives than their counterparts in Europe. One recommendation of the WGFA study advised the advisors and family offices serving this niche to avoid complexity in the structure of portfolios.
The authors cite that the more complex the portfolio and number of holdings, the more difficult the job of performing adequate governance, reporting, and education. The Institute for Private Investors, a peer networking organization for wealthy families and their advisors, suggested a similar theme to its membership in 2008 with a conference themed, "The Return to Simplicity".  Kotak Wealth Management  and CRISIL Research, published a report on the Ultra High Net Worth Individuals in India titled "Top of the Pyramid Report". 
Niall J Gannon and Michael Blum published a whitepaper in The Journal of Wealth Management  in 2006 titled The After-Tax Return of Stocks Versus Bonds for the High Tax Bracket Investor. The paper found that the return of indexed stock portfolios fell from 10.62% for non-taxable portfolios to 6.72% for a portfolio that paid the highest federal income and capital gains tax rate. The paper observed rolling 20 year periods from 1961–2006. The study was updated by Gannon and Scott Seibert, CFA in Tailored Wealth Management: Exploring the Cause and Effect of Financial Success.  This study began at the inception of the S&P 500 Index in 1957 through year end 2018 and calculated the after-tax return to be 7.36%. 
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