It is difficult to estimate the exact number of millionaires who are high school dropouts, as there is limited data available on the educational backgrounds of millionaires. However, there have been some studies and surveys conducted that provide some insight into the educational backgrounds of millionaires.

One notable study on millionaires was conducted by Thomas J. Stanley and William D. Danko, authors of the book “The Millionaire Next Door”. The study surveyed over 1,000 millionaires in the United States and found that only 18% of millionaires were high school dropouts. This is significantly lower than the percentage of high school dropouts in the general population, which was around 25% at the time the study was conducted.
Another study by Spectrem Group, a wealth management consulting firm, found that among the ultra-high net worth individuals (defined as those with a net worth of $30 million or more), only 2% were high school dropouts. This suggests that as individuals accumulate more wealth, their educational background becomes increasingly important.
However, it is important to note that these studies are not necessarily representative of all millionaires, as they may have focused on specific segments of the population or may have had other limitations. Additionally, there may be millionaires who have chosen not to disclose their educational background, making it difficult to estimate the true number of high school dropout millionaires.
There are some notable examples of successful high school dropout millionaires, such as Richard Branson, founder of Virgin Group, who dropped out of high school at age 16. However, it is important to recognize that these individuals are the exception rather than the rule. The vast majority of millionaires have completed at least a high school education and many have gone on to complete advanced degrees.
In conclusion, while there are some high school dropout millionaires, they are relatively rare compared to millionaires with higher levels of education. Studies suggest that the percentage of millionaires who are high school dropouts is lower than the percentage of high school dropouts in the general population. While educational attainment is not the only factor in achieving financial success, it is likely to be an important factor for most individuals.