UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the Securities

Exchange Act of 1934 (Amendment No.             )

Filed by the Registrant  ☒                            Filed by a Party other than the Registrant  ☐

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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
☒	Definitive Additional Materials
☐	Soliciting Material Pursuant to §240.14a-12

Silicon Laboratories 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 Shareholder Meeting to Be Held on <mtgdate>. April 19, 2018 SILICON LABORATORIES INC. Meeting Information Meeting Type: Annual<mtgtype>Meeting For holders as of: February<recdate>23, 2018 Date: April 19, 2018 Time: 9:00<mtgtime>AM CDT Location: The Lady Bird Johnson Wildflower Center 4801 La Crosse Avenue Austin, Texas 78739 BROKER LOGO HERE Return Address Line 1 Return Address Line 2 Return Address Line 3 51 MERCEDES WAY EDGEWOOD NY 11717 Investor Address Line 1 Investor Address Line 2 1 Investor Address Line 3 Investor Address Line 4 15 12 OF Investor Address Line 5 John Sample 2 1234 ANYWHERE STREET ANY CITY, ON A1A 1A1 0000352724_1 R1.0.1.17 You are receiving this communication because you hold shares in the above named company. 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. Broadridge Internal Use Only Job # Envelope # Sequence # # of # Sequence # B A R C O D E

Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: 1. Annual Report 2. Notice & Proxy Statement How to View Online: Have the information that is printed in the box marked by the arrow (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 (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 April 05, 2018 to facilitate timely delivery. How To Vote Please Choose One of the Following Voting Methods Vote In Person: If you choose to vote these shares in person at the meeting, you must request a “legal proxy.” To do so, please follow the instructions at www.proxyvote.com or request a paper copy of the materials, which will contain the appropriate instructions. Many shareholder 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. 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 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 voting instruction form. 0000352724_2 R1.0.1.17 Internal Use Only

Voting items The Board of Directors recommends you vote FOR the following proposal(s): 1. Election of Directors Nominees 1A G. Tyson Tuttle 1B Sumit Sadana 1C Gregg Lowe The Board of Directors recommends you vote FOR the following proposal(s): 2. To ratify the appointment of Ernst & Young LLP as our independent registered public accounting firm for the fiscal year ending December 29, 2018. 3. To vote on an advisory (non-binding) resolution regarding executive compensation. NOTE: In accordance with the discretion of the proxy holders, to act upon all matters incident to the conduct of the meeting and upon other matters as may properly come before the meeting. B A R C O D E Broadridge Internal Use Only xxxxxxxxxx xxxxxxxxxx Cusip Job # Envelope # Sequence # # of # Sequence # 0000352724_3 R1.0.1.17

Reserved for Broadridge Internal Control Information Voting Instructions THIS SPACE RESERVED FOR LANGUAGE PERTAINING TO BANKS AND BROKERS 17 . AS REQUIRED BY THE NEW YORK STOCK EXCHANGE . 1 . 0 R1 _ 4 0000352724 Broadridge Internal Use Only P99999-010 12 Job # THIS SPACE RESERVED FOR SIGNATURES IF APPLICABLE Envelope # Sequence 15 # # of # Sequence # OF##

*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to Be Held on <mtgdate>. April 19, 2018 SILICON LABORATORIES INC. Meeting Information Meeting Type: Annual<mtgtype>Meeting For holders as of: February<recdate>23, 2018 Date: April 19, 2018 Time: 9:00<mtgtime>AM CDT Location: The Lady Bird Johnson Wildflower Center 4801 La Crosse Avenue Austin, Texas 78739 BROKER LOGO HERE Return Address Line 1 Return Address Line 2 Return Address Line 3 51 MERCEDES WAY EDGEWOOD NY 11717 Investor Address Line 1 Investor Address Line 2 1 Investor Address Line 3 Investor Address Line 4 15 12 OF Investor Address Line 5 John Sample 2 1234 ANYWHERE STREET ANY CITY, ON A1A 1A1 0000352725_1 R1.0.1.17 You are receiving this communication because you hold shares in the above named company. 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. Broadridge Internal Use Only Job # Envelope # Sequence # # of # Sequence # B A R C O D E

Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: 1. Annual Report 2. Notice & Proxy Statement How to View Online: Have the information that is printed in the box marked by the arrow (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 (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 April 05, 2018 to facilitate timely delivery. How To Vote Please Choose One of the Following Voting Methods Vote In Person: If you choose to vote these shares in person at the meeting, you must request a “legal proxy.” To do so, please follow the instructions at www.proxyvote.com or request a paper copy of the materials, which will contain the appropriate instructions. Many shareholder 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. 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 available and follow the instructions. Vote By Telephone: To vote now by telephone, call 1-800-454-8683. Please refer to the proposals and follow the instructions. Vote By Mail: Mark, sign and date your voting form and return it in the postage-paid envelope we have provided or return it to Vote Processing, c/o Broadridge, 51 Mercedes Way, Edgewood, NY 11717. 0000352725_2 R1.0.1.17 Internal Use Only

Voting items The Board of Directors recommends you vote FOR the following proposal(s): 1. Election of Directors Nominees For Against Abstain 1A G. Tyson Tuttle 0 0 0 1B Sumit Sadana 0 0 0 1C Gregg Lowe 0 0 0 The Board of Directors recommends you vote FOR the following proposal(s): For Against Abstain 2. To ratify the appointment of Ernst & Young LLP as our independent registered public accounting firm for the 0 0 0 fiscal year ending December 29, 2018. 3. To vote on an advisory (non-binding) resolution regarding executive compensation. 0 0 0 NOTE: In accordance with the discretion of the proxy holders, to act upon all matters incident to the conduct of the meeting and upon other matters as may properly come before the meeting. B A R C O D E Broadridge Internal Use Only xxxxxxxxxx xxxxxxxxxx Cusip Job # Envelope # Sequence # # of # Sequence # 0000352725_3 R1.0.1.17

Non-Voting items PLEASE “X” HERE ONLY IF YOU PLAN TO ATTEND THE MEETING AND VOTE 0 THESE SHARES IN PERSON Voting Instructions THIS SPACE RESERVED FOR LANGUAGE PERTAINING TO BANKS AND BROKERS AS REQUIRED BY THE NEW YORK STOCK EXCHANGE Internal Use Only Signature 1—(Please sign on line) Signature 2—(Joint Owners) Date—(Please print date) 0000352725_4 R1.0.1.17