vs. adviser Both spellings, advisor and adviser, are accepted and denote someone who provides advice. According to one textbook, adviser and advisor are not interchangeable in the financial services industry, since the term adviser is generally used "when referring to legislative acts and their requirements and advisor when referring to a practitioner. Since [a financial advisor's practice] is never described as an advisery practice, advisor is preferable when not referencing the law." Congress and the Securities Exchange Commission refer to "investment advisers" when discussing regulation of them in the Investment Advisers Act of 1940. Regulation United States Advisors typically fall into two separate categories: broker-dealers (BD) who typically earn a commission from sales and registered investment advisers (RIAs) who typically charge a fee based upon assets under management while serving as fiduciaries and are registered at the state or federal level. Additionally, an advisor can be either affiliated with a large firm ("wirehouse") or be independent (e.g., independent broker-dealer or IBD). There are also "hybrid RIAs" who are both broker-dealers and registered. The number of independent broker-dealer firms has declined from 1175 in 2007 to 819 in 2018, while RIA firms have grown from 9,538 to 15,645 over the same time period. As of 2016, the largest IBD firm by revenue was LPL Financial followed by Ameriprise Financial and Raymond James Financial. Edward Jones is another large broker-dealer, and in 2017 stopped selling commission-based funds in response to a best interest fiduciary rule by the Department of Labor (DOL). As of 2019, Merrill Lynch had not adopted an RIA model while Wells Fargo and Goldman Sachs had opened up to the business model. As of 2019, the largest fee-only RIA firm was Edelman Financial Engines with over $200 billion in assets under management, under the ownership of private equity firm Hellman & Friedman. Other large fee-only RIA firms include Fisher Investments, which has over $120 billion in assets under management. As of 2019, 80% of the $4 trillion managed by RIAs were on one of four platforms: Fidelity Investments, Schwab, and Pershing LLC. Some RIAs operate inside "RIA aggregators" which provide institutional support similar to a wirehouse. In the United States, the Financial Industry Regulatory Authority (FINRA) regulates and oversees the activities of brokerage firms, and their registered representatives. The Securities and Exchange Commission (SEC) regulates investment advisers and their investment adviser representatives. Insurance companies, insurance agencies and insurance producers