SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No.     )

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¨ Preliminary Proxy Statement

¨ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

¨ Definitive Proxy Statement

x Definitive Additional Materials

¨ Soliciting Material Pursuant to § 240.14a-12

TriNet Group, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement if other than the Registrant)

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*** Exercise Your Right to Vote ***

Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting to Be Held on May 21, 2015.

TRINET GROUP, INC.

TRINET GROUP, INC.

1100 SAN LEANDRO BLVD

SUITE 400

SAN LEANDRO, CA 94577

Meeting Information

Meeting Type: Annual Meeting

For holders as of: March 24, 2015

Date: May 21, 2015 Time: 9:00 AM, local time

Location: TriNet Group, Inc.

1100 San Leandro Blvd.

Suite 400

San Leandro, CA 94577

You are receiving this communication because you hold shares in the company named above.

This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side).

We encourage you to access and review all of the important information contained in the proxy materials before voting.

See the reverse side of this notice to obtain proxy materials and voting instructions.

M90422-P60552

- Before You Vote -

How to Access the Proxy Materials

Proxy Materials Available to VIEW or RECEIVE:

NOTICE AND PROXY STATEMENT FORM 10-K

How to View Online:

Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page) and visit: www.proxyvote.com.

How to Request and Receive a PAPER or E-MAIL Copy:

If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request:

1) BY INTERNET: www.proxyvote.com

2) BY TELEPHONE: 1-800-579-1639

3) BY E-MAIL*: sendmaterial@proxyvote.com

* If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page) in the subject line.

Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before May 7, 2015 to facilitate timely delivery.

- How To Vote -

Please Choose One of the Following Voting Methods

Vote In Person: Many stockholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance and for directions to the meeting location. At the meeting, you will need to request a ballot to vote these shares. Directions to the meeting may be found at www.proxyvote.com.

Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page) available and follow the instructions.

Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.

M90423-P60552

Voting Items

The Board of Directors recommends you vote FOR the following:

1. To elect TriNet Group, Inc.’s three nominees for director to hold office until the 2018 Annual Meeting of Stockholders.

Nominees:

01) H. Raymond Bingham

02) Katherine August-deWilde

03) Kenneth Goldman

The Board of Directors recommends you vote FOR the following proposal:

2. To approve, on an advisory basis, the compensation of TriNet Group, Inc.’s Named Executive Officers, as disclosed in the proxy statement.

The Board of Directors recommends you vote 1 year on the following proposal:

3. To indicate, on an advisory basis, the preferred frequency of stockholder advisory votes on the compensation of TriNet Group, Inc.’s Named Executive Officers.

The Board of Directors recommends you vote FOR the following proposal:

4. To ratify the selection by the Audit Committee of the Board of Directors of Ernst & Young LLP as TriNet Group, Inc.’s independent registered public accounting firm for the fiscal year ending December 31, 2015.

NOTE: To conduct any other business properly brought before the meeting.

M90424-P60552

M90425-P60552