Ingram Micro Holding Corporation is an American distributor of information technology products and services. The company is based in Irvine, California, U.S. and has operations around the world. Founded as Micro D, Inc in 1979 in California by Geza Czige and Lorraine Mecca, the company, originally a traditional distributor focused on marketing, selling and shipping vendor products to resellers, is currently specializing on becoming a platform-based business that focuses on its digital experience platform.

Ingram Micro's origins trace back to the founding of distributor Micro D, Inc. in July 1979 by husband and wife team, Geza Czige and Lorraine Mecca, who were both teachers. The company started in Southern California and in its first year of business achieved approximately $3.5 million in sales.

Meanwhile, in 1982, entrepreneurs Ronald Schreiber, Irwin Schreiber, Gerald Lippes, and Paul Willax were busy founding Software Distribution Services in Buffalo, N.Y. Ingram Distribution Group, a unit of the privately held Ingram Industries, acquired Software Distribution Services in the spring of 1985 and renamed it Ingram Software. The operation was renamed Ingram Computer in February 1988.

After acquiring the remaining publicly traded shares of Micro D in 1989, Ingram Industries merged these two former competitors to create the microcomputer industry's first $1 billion computer products wholesale distribution company, renaming it Ingram Micro D.

In August 1993, Ingram Micro Belgium acquired Zaventem Electronic Dealer Distribution (Zedd) and much of its assets, including the right to distribute Hewlett-Packard products.

In 1996, Ingram Micro became a publicly traded company on the New York Stock Exchange, with revenues exceeding $12 billion.

In July 2005, Ingram Micro purchased AVAD, LLC, a wholesale distributor for home automation and A/V gear. It sold this subsidiary in July 2016.

The Shared Services Center in Manila, Philippines, began operations in May 2009, followed by another in Sofia, Bulgaria, in 2012.