Waste Connections, Inc. — Proxy Solicitation & Information Statement 2024

Apr 4, 2024

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Filed by the Registrant x

Filed by a Party other than the Registrant ¨

Check the appropriate box:

• ¨ 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 under §240.14a-12

Waste Connections, Inc.

(Name of Registrant as Specified In Its Charter)

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

Payment of Filing Fee (Check the appropriate box):

• x No fee required.

• ¨ Fee paid previously with preliminary materials.

• ¨ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a6(i)(1) and 0-11

Your Vote Counts! Pleasecheck the meeting materialsfor any special requirementsfor meeting attendance. At themeeting, you will need torequest a ballot to vote theseshares. Smartphone usersPoint your camera here andvote without entering a controlnumber For completeinformation and to vote, visitwww.ProxyVote.com Control #V42518-P07587 WASTECONNECTIONS, INC. 3WATERWAY SQUAREPLACE, SUITE 110 THEWOODLANDS, TEXAS 77380USA WASTECONNECTIONS, INC. 2024Annual Meeting ofShareholders Vote by May 16,2024 11:59 PM ET. Youinvested in WASTECONNECTIONS, INC. and it’stime to vote! You have theright to vote on proposalsbeing presented at the AnnualMeeting of Shareholders. Thisis an important noticeregarding the availability ofproxy material for the AnnualMeeting of Shareholders to beheld on May 17, 2024. Getinformed before you vote Viewthe Notice and ProxyStatement and Annual Report(including Form 10-K) onlineOR you can receive a freepaper or email copy of thematerial(s) by requesting priorto May 3, 2024. If you wouldlike to request a copy of thematerial(s) for this and/orfuture shareholder meetings,you may (1) visitwww.ProxyVote.com, (2) call1-800-579-1639 or (3) sendan email tosendmaterial@proxyvote.com.If sending an email, pleaseinclude your control number(indicated below) in thesubject line. Unlessrequested, you will nototherwise receive a paper oremail copy. Vote in Person atthe Meeting May 17, 20248:00 a.m. (Central Time)Waste Connections, Inc. 3Waterway Square Place, Suite110 The Woodlands, Texas77380 USA

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Vote atwww.ProxyVote.comPrefer to receive anemail instead? Whilevoting onwww.ProxyVote.com,be sure to click“Delivery Settings”.V42519-P07587Voting Items BoardRecommends THISIS NOT A VOTABLEBALLOT This is anoverview of theproposals beingpresented at theupcoming AnnualMeeting ofShareholders. Pleasefollow the instructionson the reverse side tovote on theseimportant matters. 1.Elect the eightdirector nomineesnamed in theCompany’s proxystatement to serve fora one-year term. 1a.Andrea E. BertoneFor 1b. Edward E.“Ned” Guillet For 1c.Michael W. HarlanFor 1d. Larry S.Hughes For 1e. EliseL. Jordan For 1f.Susan “Sue” Lee For1g. Ronald J.Mittelstaedt For 1h.Carl D. Sparks For 2.Say-on-Pay -Approve, on a non-binding, advisorybasis, thecompensation of theCompany’s namedexecutive officers asdisclosed in theCompany’s proxystatement. For 3.Appoint GrantThornton LLP as theCompany’sindependentregistered publicaccounting firm for2024 and authorizethe Company’s Boardof Directors to fix theremuneration of theindependentregistered publicaccounting firm. For4. Shareholders maybe asked to considerother business thatmay properly comebefore the meeting orany adjournment orpostponementthereof. Managementis not aware of anyother items ofbusiness at this time.

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