A Central Index Key (CIK) is a unique identifier assigned by the SEC to each filer.

Why are some filings missing?

New filings appear as the SEC updates EDGAR, and older records can vary by availability.

How often is this page updated?

Updates follow new EDGAR submissions and periodic data refreshes.

Filer Snapshot

Flagship Ventures Fund IV, L.P.

CIK 0001503559. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.

Entity Type

Company

Total Filings

Latest Filing

13 Dec 2024

Industry

n/a

Filing-backed research brief

Start with the SEC data that changes for this CIK

Latest signal: 13F-HR/A for Q1 2016. Each card links back to the PortfolioSavvy page where the filing evidence is closest.

Open 13F portfolio Save page

Latest 13F portfolio

$381.84M

3 holdings for Q1 2016

Open portfolio

Largest parsed holding

MCRB

$374.06M reported value

Open holding

13D/G large stake

—

No recent parsed 13D/G stake row for this CIK.

Browse 13D/G

Insider / owner context

—

No parsed Forms 3/4/5 owner position for this CIK.

Browse insider filings

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Source: SEC filing 144

144 filed on 13 Dec 2024 for CIK 0001503559.

View Source Filing

Business address: 55 Cambridge Parkway, 8 Th Floor, Cambridge, MA, 02142
Filing-backed coverage: 13F portfolio value
$381.84M
Latest parsed institutional portfolio value.
Top 13F symbols
MCRB, TTOO, EBIO
Symbols from the latest parsed 13F holdings.
Largest 13F holdings: MCRB TTOO EBIO
State of incorporation: DE
Fiscal year end: 31 December

Filer intelligence

What SEC filings say about Flagship Ventures Fund IV, L.P.

A compact read of parsed XML filings. 13F, 13D/G, and Forms 3/4/5 are shown separately because they answer different ownership questions.

Open 13F portfolio Save filer

Quick read

Latest parsed 13F shows $381.84M across 3 reported holdings for Q1 2016.
Largest parsed 13F holding: MCRB at $374.06M.

SEC source mix

Counts show available parsed rows, not one combined ownership total.

XML parsed

13F portfolio 3 rows

Quarterly institutional portfolio holdings.

Open

13D/G stakes No rows yet

Beneficial ownership and large-stake disclosures.

Open

Forms 3/4/5 No rows yet

Officer, director, and 10% owner holdings or transactions.

Open

Top parsed 13F holdings

Visual share of the latest parsed 13F portfolio. Values are reported market value, not a recommendation.

Q1 2016 - 03 Jun 2016

Top 5 concentration

100%

Share of latest parsed 13F value represented by the visible holdings below.

Top 5 reported value

$381.84M

Compared with $381.84M total 13F value.

Top 5 net change

Position-value change inside the visible top holdings only.

13F concentration map

A simple visual split of the latest parsed 13F portfolio.

MCRB TTOO EBIO

MCRB

98%

Seres Therapeutics Inc.

$374.06M

TTOO

1.9%

T2 Biosystems, Inc.

$7.31M

EBIO

0.1%

Eleven Biotherapeutics, Inc.

$469K

Latest update

What changed recently for Flagship Ventures Fund IV, L.P.

New filing available

Latest 13F period: Q1 2016. Open the source-backed page to inspect the fresh filing or facts context.

Update date

03 Jun 2016

Page type

Filer profile

Latest period

Q1 2016

Institutional portfolio context was refreshed from a 13F filing filed on 03 Jun 2016.

Open filer profile Browse recent public updates

Benchmark Context

Benchmark context for this company

Flagship Ventures Fund IV, L.P. has a source-backed company facts view where you can compare the latest reported metrics with its own recent history and with peer rankings for the same metric.

Compared with

Start on the facts page for period-to-period context, then open a metric ranking when you want to compare the same reported fact across other SEC-reporting companies.

Why this is notable

Latest 13F period: Q1 2016. That gives you a fresh baseline before you compare this company with peers.

Peer comparisons stay conservative: same metric, compatible units, latest valid company row only.
Open the facts page first if you want the cleanest path to verification.

Benchmark context is only shown where the app has enough comparable SEC-backed data to keep the interpretation honest.

Open company facts Browse metric rankings

SEC filing record

CIK 0001503559 filing coverage

Start with this filing record, then use the linked ownership pages when parsed 13F, 13D/G, Forms 3/4/5, or facts data exists for this CIK.

SEC filings

First seen

05 Nov 2010

Latest filing

13 Dec 2024

Entity

Company

Observed form types

144 4 3 SC 13G/A SC 13G 13F-HR/A 13F-HR D/A D

Primary evidence

Open SEC filing index Flagship Ventures Fund IV, L.P. SEC filings Flagship Ventures Fund IV, L.P. 13F portfolio

Latest Filings

Recent SEC filings for Flagship Ventures Fund IV, L.P. with direct links to document and filing folders.

144

144 filing

Filing date: 13 Dec 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38473

4

Filing date: 13 Jul 2023
Reporting date: 11 Jul 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38901

FORM 4 SUBMISSION

Filing date: 17 Oct 2022
Reporting date: 13 Oct 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38473

FORM 4 SUBMISSION

Filing date: 01 Jun 2022
Reporting date: 27 May 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38901

FORM 4 SUBMISSION

Filing date: 18 Mar 2022
Reporting date: 16 Mar 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38586

FORM 4 SUBMISSION

Filing date: 23 Mar 2021
Reporting date: 19 Mar 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38822

FORM 4 SUBMISSION

Filing date: 10 Feb 2021
Reporting date: 08 Feb 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38473

FORM 4 SUBMISSION

Filing date: 04 Feb 2021
Reporting date: 02 Feb 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-37465

FORM 4 SUBMISSION

Filing date: 25 Nov 2020
Reporting date: 23 Nov 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38753

FORM 4 SUBMISSION

Filing date: 19 Aug 2020
Reporting date: 17 Aug 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38473

FORM 4 SUBMISSION

Filing date: 01 Jul 2020
Reporting date: 29 Jun 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38822

FORM 4 SUBMISSION

Filing date: 08 Jun 2020
Reporting date: 04 Jun 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38753

FORM 4 SUBMISSION

Filing date: 26 May 2020
Reporting date: 21 May 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38901

FORM 4 SUBMISSION

Filing date: 20 May 2020
Reporting date: 18 May 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38753

FORM 4 SUBMISSION

Filing date: 13 May 2020
Reporting date: 11 May 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38753

FORM 4 SUBMISSION

Filing date: 11 Dec 2019
Reporting date: 09 Dec 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38891

FORM 4 SUBMISSION

Filing date: 31 Oct 2019
Reporting date: 29 Oct 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38901

4

Filing date: 15 May 2019
Reporting date: 13 May 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-38901

3

Filing date: 08 May 2019
Reporting date: 08 May 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38891

FORM 4 SUBMISSION

Filing date: 06 May 2019
Reporting date: 06 May 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-38891

FORM 3 SUBMISSION

Filing date: 01 May 2019
Reporting date: 01 May 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38822

FORM 4 SUBMISSION

Filing date: 06 Mar 2019
Reporting date: 04 Mar 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-38822

FORM 3 SUBMISSION

Filing date: 27 Feb 2019
Reporting date: 27 Feb 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38753

FORM 4 SUBMISSION

Filing date: 13 Dec 2018
Reporting date: 11 Dec 2018
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-38753

FORM 3 SUBMISSION

Filing date: 07 Dec 2018
Reporting date: 07 Dec 2018
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38586

4

Filing date: 23 Jul 2018
Reporting date: 20 Jul 2018
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-38586

3

Filing date: 17 Jul 2018
Reporting date: 17 Jul 2018
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38473

FORM 4 SUBMISSION

Filing date: 15 May 2018
Reporting date: 11 May 2018
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-38473

FORM 3 SUBMISSION

Filing date: 08 May 2018
Reporting date: 08 May 2018
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G/A

Filing date: 14 Feb 2018
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-37813

PRIMARY DOCUMENT

Filing date: 21 Aug 2017
Reporting date: 17 Aug 2017
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13G

Filing date: 13 Feb 2017
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36296

PRIMARY DOCUMENT

Filing date: 26 Sep 2016
Reporting date: 22 Sep 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36296

PRIMARY DOCUMENT

Filing date: 21 Sep 2016
Reporting date: 19 Sep 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36296

PRIMARY DOCUMENT

Filing date: 16 Sep 2016
Reporting date: 14 Sep 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36296

PRIMARY DOCUMENT

Filing date: 08 Sep 2016
Reporting date: 06 Sep 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-37687

PRIMARY DOCUMENT

Filing date: 15 Aug 2016
Reporting date: 11 Aug 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-37813

4

Filing date: 07 Jul 2016
Reporting date: 06 Jul 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-37813

3

Filing date: 29 Jun 2016
Reporting date: 29 Jun 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR/A File 028-17451

13F-HR/A filing

Filing date: 03 Jun 2016
Reporting date: 31 Mar 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-37465

PRIMARY DOCUMENT

Filing date: 27 May 2016
Reporting date: 25 May 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

13F-HR File 028-17451

13F-HR filing

Filing date: 13 May 2016
Reporting date: 31 Mar 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-37687

FORM 4 -

Filing date: 09 Feb 2016
Reporting date: 08 Feb 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-37687

FORM 3 -

Filing date: 02 Feb 2016
Reporting date: 02 Feb 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-37465

FORM 4 SUBMISSION

Filing date: 29 Jun 2015
Reporting date: 25 Jun 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-37465

FORM 3 SUBMISSION

Filing date: 25 Jun 2015
Reporting date: 25 Jun 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36571

4

Filing date: 14 Aug 2014
Reporting date: 12 Aug 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-36571

3

Filing date: 06 Aug 2014
Reporting date: 06 Aug 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36296

FORM 4

Filing date: 13 Feb 2014
Reporting date: 11 Feb 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-36296

FORM 3

Filing date: 05 Feb 2014
Reporting date: 05 Feb 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

D/A File 021-150087

D/A filing

Filing date: 16 Nov 2011
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

D File 021-150087

D filing

Filing date: 05 Nov 2010
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

Flagship Ventures Fund IV, L.P.

Start with the SEC data that changes for this CIK

What SEC filings say about Flagship Ventures Fund IV, L.P.

Quick read

SEC source mix

Top parsed 13F holdings

13F concentration map

MCRB

TTOO

EBIO

What changed recently for Flagship Ventures Fund IV, L.P.

Benchmark context for this company

CIK 0001503559 filing coverage

Latest Filings

144 filing

4

FORM 4 SUBMISSION

FORM 4 SUBMISSION

FORM 4 SUBMISSION

FORM 4 SUBMISSION

FORM 4 SUBMISSION

FORM 4 SUBMISSION

FORM 4 SUBMISSION

FORM 4 SUBMISSION

FORM 4 SUBMISSION

FORM 4 SUBMISSION

FORM 4 SUBMISSION

FORM 4 SUBMISSION

FORM 4 SUBMISSION

FORM 4 SUBMISSION

FORM 4 SUBMISSION

4

3

FORM 4 SUBMISSION

FORM 3 SUBMISSION

FORM 4 SUBMISSION

FORM 3 SUBMISSION

FORM 4 SUBMISSION

FORM 3 SUBMISSION

4

3

FORM 4 SUBMISSION

FORM 3 SUBMISSION

SC 13G/A

PRIMARY DOCUMENT

SC 13G

PRIMARY DOCUMENT

PRIMARY DOCUMENT

PRIMARY DOCUMENT

PRIMARY DOCUMENT

PRIMARY DOCUMENT

4

3

13F-HR/A filing

PRIMARY DOCUMENT

13F-HR filing

FORM 4 -

FORM 3 -

FORM 4 SUBMISSION

FORM 3 SUBMISSION

4

3

FORM 4

FORM 3

D/A filing

D filing

Related pages for Flagship Ventures Fund IV, L.P.