    <SEC-DOCUMENT>0001104659-21-094608-index.html : 20210722
    <SEC-HEADER>0001104659-21-094608.hdr.sgml : 20210722
    <ACCEPTANCE-DATETIME>20210722060250
    ACCESSION NUMBER:		0001104659-21-094608
    CONFORMED SUBMISSION TYPE:	424B3
    PUBLIC DOCUMENT COUNT:		16
    FILED AS OF DATE:		20210722
    DATE AS OF CHANGE:		20210722

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Quantum-Si Inc
    		CENTRAL INDEX KEY:			0001816431
    		STANDARD INDUSTRIAL CLASSIFICATION:	MEASURING & CONTROLLING DEVICES, NEC [3829]
    		IRS NUMBER:				851388175
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		424B3
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-257676
    		FILM NUMBER:		211105897

    	BUSINESS ADDRESS:
    		STREET 1:		530 OLD WHITFIELD STREET
    		CITY:			GUILFORD
    		STATE:			CT
    		ZIP:			06437
    		BUSINESS PHONE:		(203) 458-7100

    	MAIL ADDRESS:
    		STREET 1:		530 OLD WHITFIELD STREET
    		CITY:			GUILFORD
    		STATE:			CT
    		ZIP:			06437

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	HighCape Capital Acquisition Corp.
    		DATE OF NAME CHANGE:	20200629
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>424B3
    <SEQUENCE>1
    <FILENAME>tm2120157-6_424b3.htm
    <DESCRIPTION>424B3
    <TEXT>
    Document 1 - file: tm2120157-6_424b3.htm

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>lg_quantum-4clr.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: lg_quantum-4clr.jpg

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    <SEQUENCE>3
    <FILENAME>tm2120157d1-pht_dogma4clr.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: tm2120157d1-pht_dogma4clr.jpg

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    <SEQUENCE>4
    <FILENAME>tm2120157d1-pht_analys4clr.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: tm2120157d1-pht_analys4clr.jpg

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    <SEQUENCE>5
    <FILENAME>tm2120157d1-pht_legacy4clr.jpg
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    <TEXT>
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    <SEQUENCE>6
    <FILENAME>tm2120157d1-pht_lanch4clr.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: tm2120157d1-pht_lanch4clr.jpg

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    <SEQUENCE>7
    <FILENAME>tm2120157d1-pht_carbon4clr.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: tm2120157d1-pht_carbon4clr.jpg

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    <SEQUENCE>8
    <FILENAME>tm2120157d1-pc_blood4clr.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: tm2120157d1-pc_blood4clr.jpg

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    <SEQUENCE>9
    <FILENAME>tm2120157d1-pc_cell4clr.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: tm2120157d1-pc_cell4clr.jpg

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    <SEQUENCE>10
    <FILENAME>tm2120157d1-pht_platinm4clr.jpg
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    <TEXT>
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    <SEQUENCE>11
    <FILENAME>tm2120157d1-pht_wafer4clr.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
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    <SEQUENCE>12
    <FILENAME>tm2120157d1-pht_cloud4clr.jpg
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    <TEXT>
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    <SEQUENCE>13
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    <SEQUENCE>14
    <FILENAME>tm2120157d1-pht_zoome4clr.jpg
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    <TEXT>
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    <SEQUENCE>15
    <FILENAME>tm2120157d1-pht_commer4clr.jpg
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    <TEXT>
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    <SEQUENCE>16
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    <TEXT>
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