Corporate headquarters

711 High St.

Des Moines, Iowa 50392

1-800-986-3343

Principal.com

The Principal website at www.principal.com is your source for a vast array of information including company news releases, investment and savings tools and details on our product and service solutions.

The Investor Relations portion of the site provides up-to-the-minute information for shareholders and the investment community, including access to Securities and Exchange Commission filings, stock information, overview of corporate responsibility, dividend history and credit ratings. It also includes information of interest on the governance of Principal Financial Group, Inc., including:

• Board of directors
• Corporate governance guidelines
• Board committee charters
• Director independence standards
• Global code of business conduct and ethics

Annual meeting

The Annual Meeting of Shareholders will convene at 9 a.m. CT, May 16, 2017, at the corporate headquarters of Principal Financial Group, Inc.

750 Park St.

Des Moines, Iowa 50392

Contact Investor Relations

If you have a question for Investor Relations, please contact:

Principal Financial Group – Investor Relations

711 High Street, G-029-S30

Des Moines, Iowa 50392

Phone: 1-800-986-3343

Email: investor-relations@principal.com

Transfer agent

Principal Financial Group, Inc. shareholder inquiries should be addressed to our transfer agent, Computershare. Computershare can assist shareholders with a variety of services, including: signing up for for the direct deposit of dividends, dividend reinvestment, address changes, certificate issuance, account statements, balance inquiries, dividend inquiries and selling of shares. You can call or write to the transfer agent at:

Principal Financial Group, Inc.

c/o Computershare

P.O. Box 30170

College Station, TX 77842-3170

Toll-free phone: 866-781-1368

Phone for hearing impaired: 312-588-4110

Online: computershare.com/contactus

Registered shareholders can also access information about their Principal Financial Group, Inc. common stock accounts online at www.computershare.com/contactus. The Principal does not maintain or provide information directly to this site, makes no representations or warranties with respect to the information contained therein and takes no responsibility for supplementing, correcting or updating any such information.

A special thanks

A special thanks to our 295,000 registered shareholders, who have owned Principal Financial Group, Inc. common stock since our initial public offering.

Top 15 holders as of 12/31/2016

• The Vanguard Group, Inc.
• Nissay Asset Management Corporation
• Wellington Management Company, LLP
• Capital Research Global Investors (U.S.)
• State Street Global Advisors (SSgA)
• BlackRock Fund Advisors
• Northern Trust Investments, Inc.
• Fidelity Management & Research Company
• Harris Associates, L.P.
• Newton Investment Management, LTD
• Mellon Capital Management Corporation
• Dimensional Fund Advisors, L.P. (U.S.)
• Mairs & Power, Inc.
• Geode Capital Management, LLC
• TIAA-CREF Investment Management, LLC