<SEC-DOCUMENT>0000874015-24-000202.txt : 20240904
<SEC-HEADER>0000874015-24-000202.hdr.sgml : 20240904
<ACCEPTANCE-DATETIME>20240904211916
ACCESSION NUMBER:		0000874015-24-000202
CONFORMED SUBMISSION TYPE:	144/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20240904
DATE AS OF CHANGE:		20240904

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			IONIS PHARMACEUTICALS INC
		CENTRAL INDEX KEY:			0000874015
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		IRS NUMBER:				330336973
		STATE OF INCORPORATION:			CA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144/A
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	000-19125
		FILM NUMBER:		241279639

	BUSINESS ADDRESS:	
		STREET 1:		2855 GAZELLE COURT
		CITY:			CARLSBAD
		STATE:			CA
		ZIP:			92010
		BUSINESS PHONE:		7609319200

	MAIL ADDRESS:	
		STREET 1:		2855 GAZELLE COURT
		CITY:			CARLSBAD
		STATE:			CA
		ZIP:			92010

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ISIS PHARMACEUTICALS INC
		DATE OF NAME CHANGE:	19930328

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Swayze Eric
		CENTRAL INDEX KEY:			0001791058
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144/A

	MAIL ADDRESS:	
		STREET 1:		2855 GAZELLE COURT
		STREET 2:		2855 GAZELLE COURT
		CITY:			CARLSBAD
		STATE:			CA
		ZIP:			92010
</SEC-HEADER>
<DOCUMENT>
<TYPE>144/A
<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/A</submissionType>
    <previousAccessionNumber>0000874015-24-000093</previousAccessionNumber>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001791058</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>


    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0000874015</issuerCik>
      <issuerName>IONIS PHARMACEUTICALS INC</issuerName>
      <secFileNumber>000-19125</secFileNumber>
      <issuerAddress>
        <com:street1>2855 GAZELLE COURT</com:street1>
        <com:city>CARLSBAD</com:city>
        <com:stateOrCountry>CA</com:stateOrCountry>
        <com:zipCode>92010</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>7609319200</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Swayze Eric</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Morgan Stanley Smith Barney</name>
        <address>
          <com:street1>1585 Broadway</com:street1>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10036</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>1940</noOfUnitsSold>
      <aggregateMarketValue>96148.99</aggregateMarketValue>
      <noOfUnitsOutstanding>143472119</noOfUnitsOutstanding>
      <approxSaleDate>02/02/2024</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <acquiredDate>02/01/2024</acquiredDate>
      <natureOfAcquisitionTransaction>PSUs grantedunder the 2011Equity IncentivePlan</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>IonisPharmaceuticals, Inc.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>1940</amountOfSecuritiesAcquired>
      <paymentDate>02/01/2024</paymentDate>
      <natureOfPayment>Services rendered</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Insight Securities, Inc.</name>
        <address>
          <com:street1>600 Central</com:street1>
          <com:street2>STE 293</com:street2>
          <com:city>HIghland Park</com:city>
          <com:stateOrCountry>IL</com:stateOrCountry>
          <com:zipCode>60035</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>12/28/2023</saleDate>
      <amountOfSecuritiesSold>27100</amountOfSecuritiesSold>
      <grossProceeds>1355000.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Morgan Stanley Smith Barney</name>
        <address>
          <com:street1>1585 Broadway</com:street1>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10036</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <saleDate>01/17/2024</saleDate>
      <amountOfSecuritiesSold>6296</amountOfSecuritiesSold>
      <grossProceeds>317425.43</grossProceeds>
    </securitiesSoldInPast3Months>
    <remarks>Update number of shares sold.</remarks>
    <noticeSignature>
      <noticeDate>09/04/2024</noticeDate>
      <signature>Eric Swayze</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
