The early history of private equity relates to one of the major periods in the history of private equity and venture capital. Within the broader private equity industry, two distinct sub-industries, leveraged buyouts and venture capital experienced growth along parallel although interrelated tracks.

The origins of the modern private equity industry trace back to 1946 with the formation of the first venture capital firms. The thirty-five-year period from 1946 through the end of the 1970s was characterized by relatively small volumes of private equity investment, rudimentary firm organizations and limited awareness of and familiarity with the private equity industry.

Pre-history

Investors have been acquiring businesses and making minority investments in privately held companies since the dawn of the industrial revolution. Merchant bankers in London and Paris financed industrial concerns in the 1850s; most notably Crédit Mobilier, founded in 1854 by Jacob and Isaac Pereire, who together with New York-based Jay Cooke financed the United States Transcontinental Railroad. Jay Gould also acquired, merged, and organized railroads and telegraph companies in the second half of the 19th century, including Western Union, the Erie Railroad, Union Pacific and the Missouri Pacific Railroad.

Later, J. Pierpont Morgan's J.P. Morgan & Co. would finance railroads and other industrial companies throughout the United States. In certain respects, J. Pierpont Morgan's 1901 acquisition of Carnegie Steel Company from Andrew Carnegie and Henry Phipps for $480 million represents the first true major buyout as they are thought of today.

Due to structural restrictions imposed on American banks under the Glass–Steagall Act and other regulations in the 1930s, there was no private merchant banking industry in the United States, a situation that was quite exceptional in developed nations. As late as the 1980s, Lester Thurow, a noted economist, decried the inability of the financial regulation framework in the United States to support merchant banks. US investment banks were confined primarily to advisory businesses, handling mergers and acquisitions transactions and placements of equity and debt securities. Investment banks would later enter the space, however long after independent firms had become well established.

With few exceptions, private equity in the first half of the 20th century was the domain of wealthy individuals and families. The Vanderbilts, Whitneys, Rockefellers and Warburgs were notable investors in private companies in the first half of the century. In 1938, Laurance S. Rockefeller helped finance the creation of both Eastern Air Lines and Douglas Aircraft and the Rockefeller family had vast holdings in a variety of companies. Eric M. Warburg founded E.M. Warburg & Co. in 1938, which would become Warburg Pincus, with investments in leveraged buyouts and venture capital.

Origins of modern private equity It was not until after World War II that what is considered today to be true private equity investments began to emerge marked by the founding of the first two venture capital firms in 1946: American Research and Development Corporation. (ARDC) and J.H. Whitney & Company.Wilson, John. The New Ventures, Inside the High Stakes World of Venture Capital.

ARDC was founded by Georges Doriot, the "father of venture capitalism"WGBH Public Broadcasting Service, "Who made America?"-Georges Doriot" (former dean of Harvard Business School), with Ralph Flanders and Karl Compton (former president of MIT), to encourage private sector investments in businesses run by soldiers who were returning from World War II. ARDC's significance was primarily that it was the first institutional private equity investment firm that raised capital from sources other than wealthy families although it had several notable investment successes as well.The New Kings of Capitalism, Survey on the Private Equity industry The Economist, November 25, 2004 ARDC is credited with the first major venture capital success story when its 1957 investment of $70,000 in Digital Equipment Corporation (DEC) would be valued at over $355 million after the company's initial public offering in 1968 (representing a return of over 500 times on its investment and an annualized rate of return of 101%).Joseph W. Bartlett, "What Is Venture Capital?" Former employees of ARDC went on to found several prominent venture capital firms including Greylock Partners (founded in 1965 by Charlie Waite and Bill Elfers) and Morgan, Holland Ventures, the predecessor of Flagship Ventures (founded in 1982 by James Morgan).Kirsner, Scott (April 6, 2008). "Venture capital's grandfather". The Boston Globe. ARDC continued investing until 1971 with the retirement of Doriot. In 1972, Doriot merged ARDC with Textron after having invested in over 150 companies.

J.H. Whitney & Company was founded by John Hay Whitney and his partner Benno Schmidt. Whitney had been investing since the 1930s, founding Pioneer Pictures in 1933 and acquiring a 15% interest in Technicolor Corporation with his cousin Cornelius Vanderbilt Whitney. By far, Whitney's most famous investment was in Florida Foods Corporation. The company, having developed an innovative method for delivering nutrition to American soldiers, later came to be known as Minute Maid orange juice and was sold to the Coca-Cola Company in 1960. J.H. Whitney & Company continues to make investments in leveraged buyout transactions and raised $750 million for its sixth institutional private equity fund in 2005.

Before World War II, venture capital investments (originally known as "development capital") were primarily the domain of wealthy individuals and families. One of the first steps toward a professionally managed venture capital industry was the passage of the Small Business Investment Act of 1958. The 1958 Act officially allowed the U.S. Small Business Administration (SBA) to license private "Small Business Investment Companies" (SBICs) to help the financing and management of the small entrepreneurial businesses in the United States. Passage of the Act addressed concerns raised in a Federal Reserve Board report to Congress that concluded that a major gap existed in the capital markets for long-term funding for growth-oriented small businesses. Additionally, it was thought that fostering entrepreneurial companies would spur technological advances to compete against the Soviet Union. Facilitating the flow of capital through the economy up to the pioneering small concerns in order to stimulate the U.S. economy was and still is the main goal of the SBIC program today. The 1958 Act provided venture capital firms structured either as SBICs or Minority Enterprise Small Business Investment Companies (MESBICs) access to federal funds which could be leveraged at a ratio of up to 4:1 against privately raised investment funds. The success of the Small Business Administration's efforts are viewed primarily in terms of the pool of professional private equity investors that the program developed as the rigid regulatory limitations imposed by the program minimized the role of SBICs. In 2005, the SBA significantly reduced its SBIC program, though SBICs continue to make private equity investments.

Early venture capital and the growth of Silicon Valley (1959 - 1981)

During the 1960s and 1970s, venture capital firms focused their investment activity primarily on starting and expanding companies. More often than not, these companies were exploiting breakthroughs in electronic, medical or data-processing technology. As a result, venture capital came to be almost synonymous with technology finance.

It is commonly noted that the first venture-backed startup was Fairchild Semiconductor (which produced the first commercially practicable integrated circuit), funded in 1959 by what would later become Venrock Associates.The Future of Securities Regulation speech by Brian G. Cartwright, General Counsel U.S. Securities and Exchange Commission. University of Pennsylvania Law School Institute for Law and Economics Philadelphia, Pennsylvania. October 24, 2007. Venrock was founded in 1969 by Laurance S. Rockefeller, the fourth of John D. Rockefeller's six children as a way to allow other Rockefeller children to develop exposure to venture capital investments.

It was also in the 1960s that the common form of private equity fund, still in use today, emerged. Private equity firms organized limited partnerships to hold investments in which the investment professionals served as general partner and the investors, who were passive limited partners, put up the capital. The compensation structure, still in use today, also emerged with limited partners paying an annual management fee of 1-2% and a carried interest typically representing up to 20% of the profits of the partnership.

An early West Coast venture capital company was Draper and Johnson Investment Company, formed in 1962 Web site history by William Henry Draper III and Franklin P. Johnson Jr. In 1964 Bill Draper and Paul Wythes founded Sutter Hill Ventures, and Pitch Johnson formed Asset Management Company.

The growth of the venture capital industry was fueled by the emergence of the independent investment firms on Sand Hill Road, beginning with Kleiner, Perkins, Caufield & Byers and Sequoia Capital in 1972. Located, in Menlo Park, CA, Kleiner Perkins, Sequoia and later venture capital firms would have access to the burgeoning technology industries in the area. By the early 1970s, there were many semiconductor companies based in the Santa Clara Valley as well as early computer firms using their devices and programming and service companies.In 1971, a series of articles entitled "Silicon Valley USA" were published in the Electronic News, a weekly trade publication, giving rise to the use of the term Silicon Valley. Throughout the 1970s, a group of private equity firms, focused primarily on venture capital investments, would be founded that would become the model for later leveraged buyout and venture capital investment firms. In 1973, with the number of new venture capital firms increasing, leading venture capitalists formed the National Venture Capital Association (NVCA). The NVCA was to serve as the industry trade group for the venture capital industry.Official website of the National Venture Capital Association, the largest trade association for the venture capital industry. Venture capital firms suffered a temporary downturn in 1974, when the stock market crashed and investors were naturally wary of this new kind of investment fund. It was not until 1978 that venture capital experienced its first major fundraising year, as the industry raised approximately $750 million. During this period, the number of venture firms also increased. Among the firms founded in this period, in addition to Kleiner Perkins and Sequoia, that continue to invest actively are: TA Associates, a venture capital firm (and later leveraged buyouts as well), originally part of the Tucker Anthony brokerage firm, founded in 1968; Mayfield Fund, founded by early Silicon Valley venture capitalist Tommy Davis in 1969; Apax Partners, the firm's earliest predecessor, the venture capital firm Patricof & Co. was founded in 1969 and subsequently merged with Multinational Management Group (founded 1972) and later with Saunders Karp & Megrue (founded 1989); Menlo Ventures, co-founded by H.DuBose Montgomery in 1976; New Enterprise Associates founded by Chuck Newhall, Frank Bonsal and Dick Kramlich in 1978; Oak Investment Partners founded in 1978; and Sevin Rosen Funds founded by L.J. Sevin and Ben Rosen in 1980.

Venture capital played an instrumental role in developing many of the major technology companies of the 1980s. Some of the most notable venture capital investments were made in firms that include: