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The sole general partner of ARCH Fund VIII is ARCH\nVenture Partners VIII, L.P., or ARCH Partners VIII, which may be deemed to beneficially own the shares held by ARCH Fund VIII. The sole\ngeneral partner of ARCH Partners VIII is ARCH Venture Partners VIII, LLC, or ARCH VIII LLC, which may be deemed to beneficially own the\nshares held by ARCH Fund VIII. ARCH Partners VIII and ARCH VIII LLC disclaim beneficial ownership of such shares, except to the extent of\nany pecuniary interest therein. The managing directors of ARCH VIII LLC are Keith L. Crandell, Clinton Bybee and Robert Nelsen, and they may\nbe deemed to beneficially own the shares held by ARCH Fund VIII. Messrs. 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Share numbers give effect to such conversion.  The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are directly held by ARCH Venture Fund VIII, L.P., or ARCH Fund VIII. The sole general partner of ARCH Fund VIII is ARCH\nVenture Partners VIII, L.P., or ARCH Partners VIII, which may be deemed to beneficially own the shares held by ARCH Fund VIII. The sole\ngeneral partner of ARCH Partners VIII is ARCH Venture Partners VIII, LLC, or ARCH VIII LLC, which may be deemed to beneficially own the\nshares held by ARCH Fund VIII. ARCH Partners VIII and ARCH VIII LLC disclaim beneficial ownership of such shares, except to the extent of\nany pecuniary interest therein. The managing directors of ARCH VIII LLC are Keith L. Crandell, Clinton Bybee and Robert Nelsen, and they may\nbe deemed to beneficially own the shares held by ARCH Fund VIII. Messrs. 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Crandell, Bybee and Nelsen disclaim beneficial ownership of such\nshares, except to the extent of any pecuniary interest therein."}],"balance_after":2433035,"source":{"system":"sec-edgar","filing":"0001209191-20-051402","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1219043/000120919120051402/doc4.xml","form_type":"4"}},{"id":3024778,"issuer":{"id":115177,"kind":"organization","name":"Metacrine, Inc.","symbol":"MTCR"},"owners":[{"id":123760,"kind":"organization","name":"ARCH Venture Fund VIII, L.P.","position":1,"cik":"0001605598","reported_name":"ARCH Venture Fund VIII, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73815,"kind":"organization","name":"ARCH Venture Fund VIII Overage, L.P.","position":2,"cik":"0001617237","reported_name":"ARCH Venture Fund VIII Overage, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32072,"kind":"person","name":"CRANDELL KEITH","position":3,"cik":"0001219039","reported_name":"CRANDELL KEITH","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32073,"kind":"person","name":"BYBEE CLINTON","position":4,"cik":"0001219043","reported_name":"BYBEE CLINTON","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32074,"kind":"person","name":"NELSEN ROBERT","position":5,"cik":"0001219042","reported_name":"NELSEN ROBERT","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73814,"kind":"organization","name":"ARCH Venture Partners VIII, LLC","position":6,"cik":"0001616165","reported_name":"ARCH Venture Partners VIII, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":123761,"kind":"organization","name":"ARCH Venture Partners VIII, L.P.","position":7,"cik":"0001616176","reported_name":"ARCH Venture Partners VIII, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-09-22T15:07:12.000Z","date":"2020-09-18","kind":"exercise","acquired":true,"shares":1960784,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Every 5.1 shares of Series A Convertible Preferred Stock, Series B Convertible Preferred Stock and Series C Convertible Preferred Stock (the \"Preferred Stock\") automatically converted into 1 share of Common Stock upon the closing of the Issuer's initial public offering. Share numbers give effect to such conversion.  The Preferred Stock had no expiration date."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"These shares are directly held by ARCH Venture Fund VIII, L.P., or ARCH Fund VIII. The sole general partner of ARCH Fund VIII is ARCH\nVenture Partners VIII, L.P., or ARCH Partners VIII, which may be deemed to beneficially own the shares held by ARCH Fund VIII. The sole\ngeneral partner of ARCH Partners VIII is ARCH Venture Partners VIII, LLC, or ARCH VIII LLC, which may be deemed to beneficially own the\nshares held by ARCH Fund VIII. ARCH Partners VIII and ARCH VIII LLC disclaim beneficial ownership of such shares, except to the extent of\nany pecuniary interest therein. The managing directors of ARCH VIII LLC are Keith L. Crandell, Clinton Bybee and Robert Nelsen, and they may\nbe deemed to beneficially own the shares held by ARCH Fund VIII. Messrs. 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(\"ARCH Fund Overage\") and 4,631,031 shares of common stock held of record by ARCH Venture Fund VIII, L.P. (\"ARCH Fund VIII\")."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The sole general partner of ARCH Fund VIII is ARCH Venture Partners VIII, L.P. (\"ARCH Partners VIII\"). The sole general partner of ARCH Partners VIII and ARCH Fund Overage is ARCH Venture Partners VIII, LLC (\"ARCH VIII LLC\"). ARCH Partners VIII may therefore be deemed to beneficially own the securities held by ARCH Fund VIII and ARCH VIII LLC may be deemed to beneficially own the securities held by ARCH Fund VIII and ARCH Fund Overage. ARCH Partners VIII and ARCH VIII LLC disclaim beneficial ownership of such securities, except to the extent of any pecuniary interest therein. The managing directors of ARCH VIII LLC are Keith L. Crandell, Clinton Bybee and Robert Nelsen, and they may be deemed to beneficially own the shares held by ARCH Fund VIII and ARCH Fund Overage. Messrs. 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(\"ARCH Fund Overage\"), 2,900,575 shares of common stock held of record by ARCH Venture Fund VIII, L.P. (\"ARCH Fund VIII\"), and 1,865,800 shares of common stock held of record by ARCH Venture Fund X Overage, L.P. (\"ARCH X Overage\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"The sole general Partner of ARCH X Overage is ARCH Venture Partners X Overage, L.P. (\"AVP X Over GP\").  The sole general partner of AVP X Over GP is ARCH Venture Partners X, LLC (\"AVP X LLC\").  AVP X Over LP and AVP X LLC may therefore be deemed to beneficially own the securities held by ARCH X Overage.  AVP X Over GP and AVP X LLC disclaim beneficial ownership of such securities, except to the extent of any pecuniary interest therein.  Keith L. Crandell, Robert Nelsen and Steven Gillis are managing directors of AVP X LLC, and they may be deemed to beneficially own the shares held by ARCH X Overage.  Messrs. Crandell, Nelsen and Gillis disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein."}],"balance_after":1865800,"source":{"system":"sec-edgar","filing":"0001012975-19-000198","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1656328/000101297519000198/edgar.xml","form_type":"4"}},{"id":3632318,"issuer":{"id":154554,"kind":"organization","name":"Sienna Biopharmaceuticals, Inc.","symbol":"SNNA"},"owners":[{"id":73814,"kind":"organization","name":"ARCH Venture Partners VIII, LLC","position":1,"cik":"0001616165","reported_name":"ARCH Venture Partners VIII, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":123760,"kind":"organization","name":"ARCH Venture Fund VIII, L.P.","position":2,"cik":"0001605598","reported_name":"ARCH Venture Fund VIII, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73815,"kind":"organization","name":"ARCH Venture Fund VIII Overage, L.P.","position":3,"cik":"0001617237","reported_name":"ARCH Venture Fund VIII Overage, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":123761,"kind":"organization","name":"ARCH Venture Partners VIII, L.P.","position":4,"cik":"0001616176","reported_name":"ARCH Venture Partners VIII, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32073,"kind":"person","name":"BYBEE CLINTON","position":5,"cik":"0001219043","reported_name":"BYBEE CLINTON","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32072,"kind":"person","name":"CRANDELL KEITH","position":6,"cik":"0001219039","reported_name":"CRANDELL KEITH","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32074,"kind":"person","name":"NELSEN ROBERT","position":7,"cik":"0001219042","reported_name":"NELSEN ROBERT","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-02-26T21:06:38.000Z","date":"2019-02-22","kind":"purchase","acquired":true,"shares":150000,"price":2.5,"value":375000.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Following the transactions reported herein, includes 1,032,493 shares of common stock held of record by ARCH Venture Fund VIII Overage, L.P. (\"ARCH Fund Overage\"), 2,900,575 shares of common stock held of record by ARCH Venture Fund VIII, L.P. (\"ARCH Fund VIII\"), and 1,865,800 shares of common stock held of record by ARCH Venture Fund X Overage, L.P. (\"ARCH X Overage\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The sole general partner of ARCH Fund VIII is ARCH Venture Partners VIII, L.P. (\"ARCH Partners VIII\"). The sole general partner of ARCH Partners VIII and ARCH Fund Overage is ARCH Venture Partners VIII, LLC (\"ARCH VIII LLC\"). ARCH Partners VIII may therefore be deemed to beneficially own the securities held by ARCH Fund VIII and ARCH VIII LLC may be deemed to beneficially own the securities held by ARCH Fund VIII and ARCH Fund Overage. ARCH Partners VIII and ARCH VIII LLC disclaim beneficial ownership of such securities, except to the extent of any pecuniary interest therein. The managing directors of ARCH VIII LLC are Keith L. 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(\"ARCH Fund Overage\"), 2,900,575 shares of common stock held of record by ARCH Venture Fund VIII, L.P. (\"ARCH Fund VIII\"), and 1,865,800 shares of common stock held of record by ARCH Venture Fund X Overage, L.P. (\"ARCH X Overage\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The sole general partner of ARCH Fund VIII is ARCH Venture Partners VIII, L.P. (\"ARCH Partners VIII\"). The sole general partner of ARCH Partners VIII and ARCH Fund Overage is ARCH Venture Partners VIII, LLC (\"ARCH VIII LLC\"). ARCH Partners VIII may therefore be deemed to beneficially own the securities held by ARCH Fund VIII and ARCH VIII LLC may be deemed to beneficially own the securities held by ARCH Fund VIII and ARCH Fund Overage. ARCH Partners VIII and ARCH VIII LLC disclaim beneficial ownership of such securities, except to the extent of any pecuniary interest therein. The managing directors of ARCH VIII LLC are Keith L. 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(\"ARCH Fund Overage\") and 4,871,868 shares of common stock held of record by ARCH Venture Fund VIII, L.P. (\"ARCH Fund VIII\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The sole general partner of ARCH Fund VIII is ARCH Venture Partners VIII, L.P. (\"ARCH Partners VIII\"). The sole general partner of ARCH Partners VIII and ARCH Fund Overage is ARCH Venture Partners VIII, LLC (\"ARCH VIII LLC\"). ARCH Partners VIII may therefore be deemed to beneficially own the securities held by ARCH Fund VIII and ARCH VIII LLC may be deemed to beneficially own the securities held by ARCH Fund VIII and ARCH Fund Overage. ARCH Partners VIII and ARCH VIII LLC disclaim beneficial ownership of such securities, except to the extent of any pecuniary interest therein. The managing directors of ARCH VIII LLC are Keith L. Crandell, Clinton Bybee and Robert Nelsen, and they may be deemed to beneficially own the shares held by ARCH Fund VIII and ARCH Fund Overage. Messrs. Crandell, Bybee and Nelsen disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":1385457},"source":{"system":"sec-edgar","filing":"0000899243-18-009446","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1219043/000089924318009446/doc4.xml","form_type":"4"}},{"id":3969421,"issuer":{"id":5594,"kind":"organization","name":"Q32 Bio Inc.","symbol":"QTTB"},"owners":[{"id":123760,"kind":"organization","name":"ARCH Venture Fund VIII, L.P.","position":1,"cik":"0001605598","reported_name":"ARCH Venture Fund VIII, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73815,"kind":"organization","name":"ARCH Venture Fund VIII Overage, L.P.","position":2,"cik":"0001617237","reported_name":"ARCH Venture Fund VIII Overage, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":123761,"kind":"organization","name":"ARCH Venture Partners VIII, L.P.","position":3,"cik":"0001616176","reported_name":"ARCH Venture Partners VIII, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73814,"kind":"organization","name":"ARCH Venture Partners VIII, LLC","position":4,"cik":"0001616165","reported_name":"ARCH Venture Partners VIII, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32072,"kind":"person","name":"CRANDELL KEITH","position":5,"cik":"0001219039","reported_name":"CRANDELL KEITH","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32073,"kind":"person","name":"BYBEE CLINTON","position":6,"cik":"0001219043","reported_name":"BYBEE CLINTON","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32074,"kind":"person","name":"NELSEN ROBERT","position":7,"cik":"0001219042","reported_name":"NELSEN ROBERT","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series A Preferred Stock","published_at":"2018-04-04T20:25:27.000Z","date":"2018-04-02","kind":"exercise","acquired":false,"shares":4683238,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Upon closing of the Issuer's initial public offering, each share of preferred stock was automatically converted into one share of the Issuer's common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Upon closing of the Issuer's initial public offering, each share of preferred stock was automatically converted into one share of the Issuer's common stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Upon closing of the Issuer's initial public offering, each share of preferred stock was automatically converted into one share of the Issuer's common stock."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Following the transactions reported herein, includes 1,196,827 shares of common stock held of record by ARCH Venture Fund VIII Overage, L.P. (\"ARCH Fund Overage\") and 4,871,868 shares of common stock held of record by ARCH Venture Fund VIII, L.P. (\"ARCH Fund VIII\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The sole general partner of ARCH Fund VIII is ARCH Venture Partners VIII, L.P. (\"ARCH Partners VIII\"). The sole general partner of ARCH Partners VIII and ARCH Fund Overage is ARCH Venture Partners VIII, LLC (\"ARCH VIII LLC\"). ARCH Partners VIII may therefore be deemed to beneficially own the securities held by ARCH Fund VIII and ARCH VIII LLC may be deemed to beneficially own the securities held by ARCH Fund VIII and ARCH Fund Overage. ARCH Partners VIII and ARCH VIII LLC disclaim beneficial ownership of such securities, except to the extent of any pecuniary interest therein. The managing directors of ARCH VIII LLC are Keith L. Crandell, Clinton Bybee and Robert Nelsen, and they may be deemed to beneficially own the shares held by ARCH Fund VIII and ARCH Fund Overage. Messrs. Crandell, Bybee and Nelsen disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":4683238},"source":{"system":"sec-edgar","filing":"0000899243-18-009446","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1219043/000089924318009446/doc4.xml","form_type":"4"}},{"id":3969420,"issuer":{"id":5594,"kind":"organization","name":"Q32 Bio Inc.","symbol":"QTTB"},"owners":[{"id":123760,"kind":"organization","name":"ARCH Venture Fund VIII, L.P.","position":1,"cik":"0001605598","reported_name":"ARCH Venture Fund VIII, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73815,"kind":"organization","name":"ARCH Venture Fund VIII Overage, L.P.","position":2,"cik":"0001617237","reported_name":"ARCH Venture Fund VIII Overage, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":123761,"kind":"organization","name":"ARCH Venture Partners VIII, L.P.","position":3,"cik":"0001616176","reported_name":"ARCH Venture Partners VIII, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73814,"kind":"organization","name":"ARCH Venture Partners VIII, LLC","position":4,"cik":"0001616165","reported_name":"ARCH Venture Partners VIII, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32072,"kind":"person","name":"CRANDELL KEITH","position":5,"cik":"0001219039","reported_name":"CRANDELL KEITH","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32073,"kind":"person","name":"BYBEE CLINTON","position":6,"cik":"0001219043","reported_name":"BYBEE CLINTON","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32074,"kind":"person","name":"NELSEN ROBERT","position":7,"cik":"0001219042","reported_name":"NELSEN ROBERT","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2018-04-04T20:25:27.000Z","date":"2018-04-02","kind":"exercise","acquired":true,"shares":6068695,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"See footnote"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Following the transactions reported herein, includes 1,196,827 shares of common stock held of record by ARCH Venture Fund VIII Overage, L.P. (\"ARCH Fund Overage\") and 4,871,868 shares of common stock held of record by ARCH Venture Fund VIII, L.P. (\"ARCH Fund VIII\")."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"The sole general partner of ARCH Fund VIII is ARCH Venture Partners VIII, L.P. (\"ARCH Partners VIII\"). The sole general partner of ARCH Partners VIII and ARCH Fund Overage is ARCH Venture Partners VIII, LLC (\"ARCH VIII LLC\"). ARCH Partners VIII may therefore be deemed to beneficially own the securities held by ARCH Fund VIII and ARCH VIII LLC may be deemed to beneficially own the securities held by ARCH Fund VIII and ARCH Fund Overage. ARCH Partners VIII and ARCH VIII LLC disclaim beneficial ownership of such securities, except to the extent of any pecuniary interest therein. The managing directors of ARCH VIII LLC are Keith L. Crandell, Clinton Bybee and Robert Nelsen, and they may be deemed to beneficially own the shares held by ARCH Fund VIII and ARCH Fund Overage. Messrs. Crandell, Bybee and Nelsen disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein."}],"balance_after":6068695,"source":{"system":"sec-edgar","filing":"0000899243-18-009446","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1219043/000089924318009446/doc4.xml","form_type":"4"}},{"id":4133126,"issuer":{"id":6649,"kind":"organization","name":"Quanterix Corp","symbol":"QTRX"},"owners":[{"id":145090,"kind":"organization","name":"ARCH VENTURE FUND VI LP","position":1,"cik":"0001222135","reported_name":"ARCH VENTURE FUND VI LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73815,"kind":"organization","name":"ARCH Venture Fund VIII Overage, L.P.","position":2,"cik":"0001617237","reported_name":"ARCH Venture Fund VIII Overage, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":145091,"kind":"organization","name":"ARCH VENTURE PARTNERS VI LP","position":3,"cik":"0001274410","reported_name":"ARCH VENTURE PARTNERS VI LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":145092,"kind":"organization","name":"ARCH VENTURE PARTNERS VI LLC","position":4,"cik":"0001274412","reported_name":"ARCH VENTURE PARTNERS VI LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73814,"kind":"organization","name":"ARCH Venture Partners VIII, LLC","position":5,"cik":"0001616165","reported_name":"ARCH Venture Partners VIII, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32073,"kind":"person","name":"BYBEE CLINTON","position":6,"cik":"0001219043","reported_name":"BYBEE CLINTON","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32074,"kind":"person","name":"NELSEN ROBERT","position":7,"cik":"0001219042","reported_name":"NELSEN ROBERT","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series D Preferred Stock","published_at":"2017-12-13T16:25:35.000Z","date":"2017-12-11","kind":"exercise","acquired":false,"shares":4087193,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"These shares were convertible into the Issuer's common stock in accordance with the Issuer's Restated Certificate of Incorporation, as amended, at any time after the issuance of such shares, at the holder's election."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"Not applicable."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F3","text":"The shares are held of record by ARCH Venture Fund VIII Overage, L.P. (\"ARCH Fund Overage\"). The sole general partner of ARCH Fund Overage is ARCH Venture Partners VIII, LLC (\"ARCH VIII LLC\"), which may be deemed to beneficially own the shares held by ARCH Fund Overage. ARCH VIII LLC disclaims beneficial ownership of such shares, except to the extent of any pecuniary interest therein. As a managing director of ARCH VIII LLC, the Reporting Person may be deemed to beneficially own the shares held by ARCH Fund Overage. The Reporting Person disclaims beneficial ownership of such shares, except to the extent of any pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":1271684},"source":{"system":"sec-edgar","filing":"0001104659-17-073156","document":"a4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/1222135/000110465917073156/a4.xml","form_type":"4"}},{"id":4133125,"issuer":{"id":6649,"kind":"organization","name":"Quanterix Corp","symbol":"QTRX"},"owners":[{"id":145090,"kind":"organization","name":"ARCH VENTURE FUND VI LP","position":1,"cik":"0001222135","reported_name":"ARCH VENTURE FUND VI LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73815,"kind":"organization","name":"ARCH Venture Fund VIII Overage, L.P.","position":2,"cik":"0001617237","reported_name":"ARCH Venture Fund VIII Overage, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":145091,"kind":"organization","name":"ARCH VENTURE PARTNERS VI LP","position":3,"cik":"0001274410","reported_name":"ARCH VENTURE PARTNERS VI LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":145092,"kind":"organization","name":"ARCH VENTURE PARTNERS VI LLC","position":4,"cik":"0001274412","reported_name":"ARCH VENTURE PARTNERS VI LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73814,"kind":"organization","name":"ARCH Venture Partners VIII, LLC","position":5,"cik":"0001616165","reported_name":"ARCH Venture Partners VIII, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32073,"kind":"person","name":"BYBEE CLINTON","position":6,"cik":"0001219043","reported_name":"BYBEE CLINTON","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32074,"kind":"person","name":"NELSEN ROBERT","position":7,"cik":"0001219042","reported_name":"NELSEN ROBERT","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series D Preferred Stock","published_at":"2017-12-13T16:25:35.000Z","date":"2017-12-11","kind":"exercise","acquired":false,"shares":1226158,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"These shares were convertible into the Issuer's common stock in accordance with the Issuer's Restated Certificate of Incorporation, as amended, at any time after the issuance of such shares, at the holder's election."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"Not applicable."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"The shares are held of record by ARCH Venture Fund VI, L.P. (\"ARCH Fund VI\"). The sole general partner of ARCH Fund VI is ARCH Venture Partners VI, L.P. (\"ARCH Partners VI\"), which may be deemed to beneficially own the shares held by ARCH Fund VI. The sole general partner of ARCH Partners VI is ARCH Venture Partners VI, LLC (\"ARCH VI LLC\"), which may be deemed to beneficially own the shares held by ARCH Fund VI. ARCH Partners VI and ARCH VI LLC disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein. As a managing director of ARCH VI LLC, the Reporting Person may be deemed to beneficially own the shares held by ARCH Fund VI. The Reporting Person disclaims beneficial ownership of such shares, except to the extent of any pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":381507},"source":{"system":"sec-edgar","filing":"0001104659-17-073156","document":"a4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/1222135/000110465917073156/a4.xml","form_type":"4"}},{"id":4133124,"issuer":{"id":6649,"kind":"organization","name":"Quanterix Corp","symbol":"QTRX"},"owners":[{"id":145090,"kind":"organization","name":"ARCH VENTURE FUND VI LP","position":1,"cik":"0001222135","reported_name":"ARCH VENTURE FUND VI LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73815,"kind":"organization","name":"ARCH Venture Fund VIII Overage, L.P.","position":2,"cik":"0001617237","reported_name":"ARCH Venture Fund VIII Overage, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":145091,"kind":"organization","name":"ARCH VENTURE PARTNERS VI LP","position":3,"cik":"0001274410","reported_name":"ARCH VENTURE PARTNERS VI LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":145092,"kind":"organization","name":"ARCH VENTURE PARTNERS VI LLC","position":4,"cik":"0001274412","reported_name":"ARCH VENTURE PARTNERS VI LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73814,"kind":"organization","name":"ARCH Venture Partners VIII, LLC","position":5,"cik":"0001616165","reported_name":"ARCH Venture Partners VIII, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32073,"kind":"person","name":"BYBEE CLINTON","position":6,"cik":"0001219043","reported_name":"BYBEE CLINTON","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32074,"kind":"person","name":"NELSEN ROBERT","position":7,"cik":"0001219042","reported_name":"NELSEN ROBERT","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series C Preferred Stock","published_at":"2017-12-13T16:25:35.000Z","date":"2017-12-11","kind":"exercise","acquired":false,"shares":352800,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"These shares were convertible into the Issuer's common stock in accordance with the Issuer's Restated Certificate of Incorporation, as amended, at any time after the issuance of such shares, at the holder's election."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"Not applicable."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"The shares are held of record by ARCH Venture Fund VI, L.P. (\"ARCH Fund VI\"). The sole general partner of ARCH Fund VI is ARCH Venture Partners VI, L.P. (\"ARCH Partners VI\"), which may be deemed to beneficially own the shares held by ARCH Fund VI. The sole general partner of ARCH Partners VI is ARCH Venture Partners VI, LLC (\"ARCH VI LLC\"), which may be deemed to beneficially own the shares held by ARCH Fund VI. ARCH Partners VI and ARCH VI LLC disclaim beneficial ownership of such shares, except to the extent of any pecuniary interest therein. As a managing director of ARCH VI LLC, the Reporting Person may be deemed to beneficially own the shares held by ARCH Fund VI. The Reporting Person disclaims beneficial ownership of such shares, except to the extent of any pecuniary interest therein."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":109769},"source":{"system":"sec-edgar","filing":"0001104659-17-073156","document":"a4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1222135/000110465917073156/a4.xml","form_type":"4"}},{"id":4133123,"issuer":{"id":6649,"kind":"organization","name":"Quanterix Corp","symbol":"QTRX"},"owners":[{"id":145090,"kind":"organization","name":"ARCH VENTURE FUND VI LP","position":1,"cik":"0001222135","reported_name":"ARCH VENTURE FUND VI LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73815,"kind":"organization","name":"ARCH Venture Fund VIII Overage, L.P.","position":2,"cik":"0001617237","reported_name":"ARCH Venture Fund VIII Overage, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":145091,"kind":"organization","name":"ARCH VENTURE PARTNERS VI LP","position":3,"cik":"0001274410","reported_name":"ARCH VENTURE PARTNERS VI LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":145092,"kind":"organization","name":"ARCH VENTURE PARTNERS VI LLC","position":4,"cik":"0001274412","reported_name":"ARCH VENTURE PARTNERS VI LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":73814,"kind":"organization","name":"ARCH Venture Partners VIII, LLC","position":5,"cik":"0001616165","reported_name":"ARCH Venture Partners VIII, LLC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32073,"kind":"person","name":"BYBEE CLINTON","position":6,"cik":"0001219043","reported_name":"BYBEE CLINTON","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":32074,"kind":"person","name":"NELSEN ROBERT","position":7,"cik":"0001219042","reported_name":"NELSEN ROBERT","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Series B Preferred Stock","published_at":"2017-12-13T16:25:35.000Z","date":"2017-12-11","kind":"exercise","acquired":false,"shares":1533214,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. The shares of preferred stock automatically converted on a 1-for-3.214 basis and such conversion rate is reflected in the amount of common stock underlying the security."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The shares of preferred stock automatically converted into common stock immediately prior to the closing of the Issuer's initial public offering using a calculation defined in the Issuer's Restated Certificate of Incorporation, as amended, based on the initial purchase price and the conversion rate in effect at the time of conversion. 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