<SEC-DOCUMENT>0001646343-17-000008.txt : 20171114
<SEC-HEADER>0001646343-17-000008.hdr.sgml : 20171114
<ACCEPTANCE-DATETIME>20171114162016
ACCESSION NUMBER:		0001646343-17-000008
CONFORMED SUBMISSION TYPE:	13F-HR
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20170930
FILED AS OF DATE:		20171114
DATE AS OF CHANGE:		20171114
EFFECTIVENESS DATE:		20171114

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NEXTHERA CAPITAL LP
		CENTRAL INDEX KEY:			0001646343
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		13F-HR
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	028-17280
		FILM NUMBER:		171201839

	BUSINESS ADDRESS:	
		STREET 1:		900 THIRD AVENUE
		STREET 2:		SUITE 1100
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
		BUSINESS PHONE:		(212) 213-7033

	MAIL ADDRESS:	
		STREET 1:		900 THIRD AVENUE
		STREET 2:		SUITE 1100
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
</SEC-HEADER>
<DOCUMENT>
<TYPE>13F-HR
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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          <cik>0001646343</cik>
          <ccc>XXXXXXXX</ccc>
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      <periodOfReport>09-30-2017</periodOfReport>
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      <reportCalendarOrQuarter>09-30-2017</reportCalendarOrQuarter>
      <filingManager>
        <name>NEXTHERA CAPITAL LP</name>
        <address>
          <com:street1>900 THIRD AVENUE</com:street1>
          <com:street2>SUITE 1100</com:street2>
          <com:city>NEW YORK</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10022</com:zipCode>
        </address>
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      <provideInfoForInstruction5>N</provideInfoForInstruction5>
    </coverPage>
    <signatureBlock>
      <name>Daniel Malek</name>
      <title>Managing Member of the General Partner Phone:</title>
      <phone>6462137030</phone>
      <signature>Daniel Malek</signature>
      <city>New YOrk</city>
      <stateOrCountry>NY</stateOrCountry>
      <signatureDate>11-14-2017</signatureDate>
    </signatureBlock>
    <summaryPage>
      <otherIncludedManagersCount>0</otherIncludedManagersCount>
      <tableEntryTotal>38</tableEntryTotal>
      <tableValueTotal>388737</tableValueTotal>
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</SEC-DOCUMENT>