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Form 3 - Initial statement of beneficial ownership of securities:
SEC Accession No. 0000899243-17-026404
Filing Date
2017-11-15
Accepted
2017-11-15 17:33:37
Documents
1
Period of Report
2017-11-15

Document Format Files

Seq Description Document Type Size
1 FORM 3 SUBMISSION doc3.html 3  
1 FORM 3 SUBMISSION doc3.xml 3 36430
  Complete submission text file 0000899243-17-026404.txt   40704
Mailing Address 1000 WINTER STREET SUITE 3350 WALTHAM MA 02451
Business Address
Flint Jonathan A (Reporting) CIK: 0001295676 (see all company filings)

Type: 3 | Act: 34 | File No.: 001-38295 | Film No.: 171206129

Mailing Address 1000 WINTER STREET SUITE 3350 WALTHAM MA 02451
Business Address 1000 WINTER STREET SUITE 3350 WALTHAM MA 02451 781-290-0770
Polaris Venture Partners Special Founders' Fund V, L.P. (Reporting) CIK: 0001439586 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 001-38295 | Film No.: 171206130

Mailing Address 1000 WINTER STREET SUITE 3350 WALTHAM MA 02451
Business Address 1000 WINTER STREET SUITE 3350 WALTHAM MA 02451 781-290-0770
Polaris Venture Partners Entrepreneurs' Fund V, L.P. (Reporting) CIK: 0001439587 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 001-38295 | Film No.: 171206132

Mailing Address 1000 WINTER STREET SUITE 3350 WALTHAM MA 02451
Business Address 1000 WINTER STREET SUITE 3350 WALTHAM MA 02451 781-290-0770
Polaris Venture Partners Founders' Fund V, L.P. (Reporting) CIK: 0001439588 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 001-38295 | Film No.: 171206131

Mailing Address ONE MARINA PARK DRIVE 10TH FLOOR BOSTON MA 02210
Business Address ONE MARINA PARK DRIVE 10TH FLOOR BOSTON MA 02210 781-290-0770
Polaris Venture Management Co. V, L.L.C. (Reporting) CIK: 0001439589 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 001-38295 | Film No.: 171206128

Mailing Address 1000 WINTER STREET SUITE 3350 WALTHAM MA 02451
Business Address 1000 WINTER STREET SUITE 3350 WALTHAM MA 02451 781-290-0770
Polaris Venture Partners V, L.P. (Reporting) CIK: 0001439590 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 001-38295 | Film No.: 171206127

Mailing Address 890 WINTER STREET, SUITE 230 WALTHAM MA 02451
Business Address 890 WINTER STREET, SUITE 230 WALTHAM MA 02451 781-819-5704
Arsanis, Inc. (Issuer) CIK: 0001501697 (see all company filings)

IRS No.: 273181608 | State of Incorp.: DE | Fiscal Year End: 1231
SIC: 2836 Biological Products, (No Diagnostic Substances)