Patrick Martin founded Martin & Co. in March 1989 to provide equity investment advice for several high net worth families. The focus was on establishing a disciplined investment philosophy for the firm based on successful historical strategies that included an emphasis on quality earnings, strong fundamentals, proprietary market positions, and reasonable valuations. The firm’s universe was investments in mid to large capitalization public equities in the domestic market and in international markets (about 10% to 15%) through the use of American Depository Receipts (ADRs). The firm’s “Best Ideas” Strategy, Martin U.S. Equity Investing Strategy, was created based on this investment philosophy. The portfolio is limited to 25 to 30 names, and the turnover is approximately 20% per year. Sandra S. Martin joined the firm in 1991, assisting with equity research analysis.

In 2002, the firm was restructured as a limited liability company, Martin Investment Management, LLC. Mary Ellen Zellerbach joined the firm in 2003. The firm became a majority female owned firm in 2006 and has been certified by the Women Business Enterprise National Council (WBENC) as a women owned firm since 2011. The firm received its first institutional account in 1992, and acquired its first public pension account in 2009.

Martin Investment Management claims compliance with the Global Investment Performance Standards (GIPS®). GIPS® is a registered trademark of CFA Institute. CFA Institute does not endorse or promote this organization, nor does it warrant the accuracy or quality of the content contained herein. To receive a list of composite descriptions of Martin Investment Management, LLC and/or a presentation that complies with the GIPS standards, contact Patrick A. Martin at (847) 424-9124, or write Martin Investment Management, 1560 Sherman Avenue Suite 1250, Evanston Illinois 60201, or email

The firm introduced two new strategies at the beginning of 2008, which compliment the firm’s existing U.S. Investing Strategy . Global Eco-Investing Strategy(2008) invests in both U.S. and non-U.S. companies that positively benefit the environment through their stewardship and sustainable practices. The firm uses a proprietary database and technology to determine a company’s ranking on factors. Martin International Investing Strategy invests in non-U.S. equities of the developed world. The firm believed its experience of investing approximately 10% to 15% of the portfolio in non-U.S. equities since 1989 established its competency to develop two new strategies. Both Martin International Investing Strategy Eco-Investing share a similar philosophy and investment process the Martin U.S. Investing Strategy.

Philip A. Martin joined the firm in 2013. In 2016, the firm introduced a non global strategy, Martin Global Investing, which combines the firm’s domestic U.S. Investing and International Investing strategies. Martin Global Investing Strategy holds more securities in its portfolio (45-60 issues) than the other strategies of the firm. In 2018, the firm introduced Women’s Advantage, which is a focused strategy, investing in 25 to 30 high quality U.S. and non-U.S. developed world companies with a market capitalization above $2 billion. The strategy seeks to invest in companies that promote women in leadership positions relative to their peers. The firm uses proprietary technology to determine a company’s ranking on women in leadership factors.