<SEC-DOCUMENT>0001949846-25-000657.txt : 20251203
<SEC-HEADER>0001949846-25-000657.hdr.sgml : 20251203
<ACCEPTANCE-DATETIME>20251203102511
ACCESSION NUMBER:		0001949846-25-000657
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20251203
DATE AS OF CHANGE:		20251203

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COGENT COMMUNICATIONS HOLDINGS, INC.
		CENTRAL INDEX KEY:			0001158324
		STANDARD INDUSTRIAL CLASSIFICATION:	COMMUNICATION SERVICES, NEC [4899]
		ORGANIZATION NAME:           	06 Technology
		EIN:				522337274
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	000-51829
		FILM NUMBER:		251545316

	BUSINESS ADDRESS:	
		STREET 1:		2450 N STREET, NW
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20037
		BUSINESS PHONE:		2022954200

	MAIL ADDRESS:	
		STREET 1:		2450 N STREET, NW
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20037

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	COGENT COMMUNICATIONS GROUP INC
		DATE OF NAME CHANGE:	20010828

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			KILMER HENRY W
		CENTRAL INDEX KEY:			0001599812
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144

	MAIL ADDRESS:	
		STREET 1:		C/O COGENT COMMUNICATIONS HOLDINGS, INC.
		STREET 2:		2450 N ST NW, 4TH FLOOR
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20037
</SEC-HEADER>
<DOCUMENT>
<TYPE>144
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001599812</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001158324</issuerCik>
      <issuerName>COGENT COMMUNICATIONS HOLDINGS, INC.</issuerName>
      <secFileNumber>000-51829</secFileNumber>
      <issuerAddress>
        <com:street1>2450 N STREET, NW</com:street1>
        <com:city>WASHINGTON</com:city>
        <com:stateOrCountry>DC</com:stateOrCountry>
        <com:zipCode>20037</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>2022954200</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>KILMER HENRY W</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Charles Schwab &amp; Co</name>
        <address>
          <com:street1>3000 Schwab Way</com:street1>
          <com:city>westlake</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>76262</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>4800</noOfUnitsSold>
      <aggregateMarketValue>95952.00</aggregateMarketValue>
      <noOfUnitsOutstanding>49121159</noOfUnitsOutstanding>
      <approxSaleDate>12/03/2025</approxSaleDate>
      <securitiesExchangeName>Nasdaq</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>common</securitiesClassTitle>
      <acquiredDate>12/01/2025</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock plan</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>4800</amountOfSecuritiesAcquired>
      <paymentDate>12/01/2025</paymentDate>
      <natureOfPayment>equity compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Henry Kilmer</name>
        <address>
          <com:street1>2450 N STREET, NW</com:street1>
          <com:city>WASHINGTON</com:city>
          <com:stateOrCountry>DC</com:stateOrCountry>
          <com:zipCode>20037</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>common</securitiesClassTitle>
      <saleDate>09/05/2025</saleDate>
      <amountOfSecuritiesSold>2400</amountOfSecuritiesSold>
      <grossProceeds>88775.60</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>12/03/2025</noticeDate>
      <signature>Henry Kilmer</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
