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

Brian G. Atwood

CIK 0001266567. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.

Entity Type

Individual

Total Filings

149

Latest Filing

09 Jan 2026

Industry

n/a

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Start with the summary below, then verify the strongest source-backed page for this filer.

Open 13F if you want portfolio holdings.
Open 13D/G or insider pages only when this CIK has those rows.

Open reporting owner context

Source: SEC Forms 3/4/5

4 filed on 09 Jan 2026 for CIK 0001266567.

View Source Filing

Business address: One Sansome Street, Suite 1650, San Francisco, CA, 94104
Top holdings (ownership): CERO
Top holdings (Schedule 13D): CERO

Filer intelligence

What SEC filings say about Brian G. Atwood

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

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Quick read

1 recent 13D/G stake row found; top row is CERO at 9.9% ownership.
Forms 3/4/5 show insider context for CERO worth $1M.

SEC source mix

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

XML parsed

13F portfolio No rows yet

Quarterly institutional portfolio holdings.

Open

13D/G stakes 1 rows

Beneficial ownership and large-stake disclosures.

Open

Forms 3/4/5 4 rows

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

Open

13D/G large-stake context

CERO

31 Mar 2025 · Common Stock, $0.0001 par value per share

9.9%

Issuer page 13D/G history

Forms 3/4/5 insider context

CERO

07 Jan 2026

$1M

Issuer page Owner page

LPAA

11 Jul 2024

Issuer page Owner page

BCEL

13 Jun 2023

Issuer page Owner page

CLVS

10 Jun 2021

Issuer page Owner page

Latest update

What changed recently for Brian G. Atwood

Ownership report updated

Latest ownership report period: 07 Jan 2026. Open the source-backed page to inspect the fresh filing or facts context.

Update date

09 Jan 2026

Page type

Ownership filings

Latest period

07 Jan 2026

Ownership context was refreshed from SEC Forms 3/4/5 filed on 09 Jan 2026.

Open ownership filings Browse recent public updates

Filer Overview

Brian G. Atwood has filed 149 SEC EDGAR filings since 05 Nov 2003. Common forms include 4, SCHEDULE 13D/A, CORRESP, SC 13D and more.

Brian G. Atwood SEC filings Brian G. Atwood 13D/G history Brian G. Atwood owner filings

Latest Filings

Recent SEC filings for Brian G. Atwood with direct links to document and filing folders.

4 File 001-40877

4 filing

Filing date: 09 Jan 2026
Reporting date: 07 Jan 2026
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-40877

4 filing

Filing date: 02 Jun 2025
Reporting date: 30 May 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

SCHEDULE 13D/A

SCHEDULE 13D/A filing

Filing date: 04 Apr 2025
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-40877

4 filing

Filing date: 04 Apr 2025
Reporting date: 31 Mar 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-40877

4 filing

Filing date: 06 Mar 2025
Reporting date: 04 Mar 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-40877

4 filing

Filing date: 26 Feb 2025
Reporting date: 24 Feb 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-40877

4 filing

Filing date: 07 Feb 2025
Reporting date: 07 Feb 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

SCHEDULE 13D/A

SCHEDULE 13D/A filing

Filing date: 07 Feb 2025
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

CORRESP

CORRESP filing

Filing date: 27 Jan 2025
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-40877

4 filing

Filing date: 04 Dec 2024
Reporting date: 02 Dec 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

SC 13D

SCHEDULE 13D

Filing date: 30 Oct 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-40877

4 filing

Filing date: 02 Oct 2024
Reporting date: 25 Sep 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-42173

3 filing

Filing date: 11 Jul 2024
Reporting date: 11 Jul 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-40877

4 filing

Filing date: 27 Mar 2024
Reporting date: 25 Mar 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

4/A File 001-40877

4/A filing

Filing date: 11 Mar 2024
Reporting date: 14 Feb 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

4/A File 001-40877

4/A filing

Filing date: 21 Feb 2024
Reporting date: 14 Feb 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-40877

4 filing

Filing date: 16 Feb 2024
Reporting date: 14 Feb 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38935

FORM 4 SUBMISSION

Filing date: 15 Jun 2023
Reporting date: 13 Jun 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38935

FORM 4 SUBMISSION

Filing date: 13 Jun 2022
Reporting date: 08 Jun 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-40877

FORM 4 SUBMISSION

Filing date: 12 Oct 2021
Reporting date: 08 Oct 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-40877

FORM 3 SUBMISSION

Filing date: 05 Oct 2021
Reporting date: 05 Oct 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

FORM 4 SUBMISSION

Filing date: 11 Jun 2021
Reporting date: 10 Jun 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38935

FORM 4 SUBMISSION

Filing date: 11 Jun 2021
Reporting date: 09 Jun 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-39866

FORM 4 SUBMISSION

Filing date: 14 Jan 2021
Reporting date: 12 Jan 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-39866

FORM 3 SUBMISSION

Filing date: 07 Jan 2021
Reporting date: 07 Jan 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38935

FORM 4 SUBMISSION

Filing date: 10 Dec 2020
Reporting date: 09 Dec 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

FORM 4 SUBMISSION

Filing date: 10 Nov 2020
Reporting date: 09 Nov 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38935

FORM 4 SUBMISSION

Filing date: 15 Jun 2020
Reporting date: 10 Jun 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

FORM 4 SUBMISSION

Filing date: 05 Jun 2020
Reporting date: 04 Jun 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

FORM 4 SUBMISSION

Filing date: 22 Aug 2019
Reporting date: 20 Aug 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-38935

FORM 4 SUBMISSION

Filing date: 24 Jun 2019
Reporting date: 24 Jun 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-38935

FORM 3 SUBMISSION

Filing date: 19 Jun 2019
Reporting date: 19 Jun 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

FORM 4 SUBMISSION

Filing date: 07 Jun 2019
Reporting date: 06 Jun 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

FORM 4 SUBMISSION

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

4 File 001-35347

4

Filing date: 28 Jun 2017
Reporting date: 26 Jun 2017
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

FORM 4 SUBMISSION

Filing date: 08 Jun 2017
Reporting date: 08 Jun 2017
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-37772

FORM 4

Filing date: 30 May 2017
Reporting date: 25 May 2017
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-37367

FORM 4

Filing date: 24 Jun 2016
Reporting date: 22 Jun 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36156

FORM 4 -

Filing date: 20 Jun 2016
Reporting date: 20 Jun 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36287

4

Filing date: 10 Jun 2016
Reporting date: 08 Jun 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

FORM 4 SUBMISSION

Filing date: 10 Jun 2016
Reporting date: 09 Jun 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-37772

OWNERSHIP DOCUMENT

Filing date: 03 Jun 2016
Reporting date: 01 Jun 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-37463

FORM 4 SUBMISSION

Filing date: 02 Jun 2016
Reporting date: 31 May 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-37772

OWNERSHIP DOCUMENT

Filing date: 24 May 2016
Reporting date: 23 May 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-37772

OWNERSHIP DOCUMENT

Filing date: 24 May 2016
Reporting date: 23 May 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

3/A File 001-37772

OWNERSHIP DOCUMENT

Filing date: 24 May 2016
Reporting date: 17 May 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

3/A File 001-37772

OWNERSHIP DOCUMENT

Filing date: 24 May 2016
Reporting date: 17 May 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-37772

OWNERSHIP DOCUMENT

Filing date: 17 May 2016
Reporting date: 17 May 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-37772

OWNERSHIP DOCUMENT

Filing date: 17 May 2016
Reporting date: 17 May 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36561

PRIMARY DOCUMENT

Filing date: 06 Jan 2016
Reporting date: 04 Jan 2016
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-37463

4

Filing date: 30 Jun 2015
Reporting date: 30 Jun 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-37463

3

Filing date: 24 Jun 2015
Reporting date: 24 Jun 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36070

PRIMARY DOCUMENT

Filing date: 16 Jun 2015
Reporting date: 12 Jun 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

FORM 4 SUBMISSION

Filing date: 15 Jun 2015
Reporting date: 11 Jun 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36156

FORM 4 -

Filing date: 21 May 2015
Reporting date: 19 May 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

FORM 4 SUBMISSION

Filing date: 18 May 2015
Reporting date: 14 May 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-37367

FORM 4

Filing date: 12 May 2015
Reporting date: 08 May 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

4/A File 001-36309

FORM 4/A SUBMISSION

Filing date: 11 May 2015
Reporting date: 05 Nov 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-37367

FORM 3

Filing date: 06 May 2015
Reporting date: 04 May 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36561

PRIMARY DOCUMENT

Filing date: 09 Jan 2015
Reporting date: 07 Jan 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36309

FORM 4 SUBMISSION

Filing date: 08 Jan 2015
Reporting date: 06 Jan 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36309

FORM 4 SUBMISSION

Filing date: 06 Jan 2015
Reporting date: 05 Jan 2015
SEC evidence: Open document Open filing
Next action: Verify source filing

4/A File 001-36309

FORM 4/A SUBMISSION

Filing date: 05 Jan 2015
Reporting date: 18 Dec 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36309

FORM 4 SUBMISSION

Filing date: 29 Dec 2014
Reporting date: 23 Dec 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36309

FORM 4 SUBMISSION

Filing date: 22 Dec 2014
Reporting date: 18 Dec 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

3/A File 001-36747

FORM 3/A SUBMISSION

Filing date: 02 Dec 2014
Reporting date: 02 Dec 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36309

FORM 4 SUBMISSION

Filing date: 19 Nov 2014
Reporting date: 17 Nov 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-36747

FORM 3 SUBMISSION

Filing date: 18 Nov 2014
Reporting date: 18 Nov 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36309

FORM 4 SUBMISSION

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

4 File 001-36309

FORM 4 SUBMISSION

Filing date: 12 Nov 2014
Reporting date: 10 Nov 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36309

FORM 4 SUBMISSION

Filing date: 07 Nov 2014
Reporting date: 05 Nov 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36309

FORM 4 SUBMISSION

Filing date: 28 Oct 2014
Reporting date: 24 Oct 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36309

FORM 4 SUBMISSION

Filing date: 14 Oct 2014
Reporting date: 09 Oct 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36309

FORM 4 SUBMISSION

Filing date: 09 Oct 2014
Reporting date: 07 Oct 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36287

FORM 4 SUBMISSION

Filing date: 12 Sep 2014
Reporting date: 10 Sep 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36309

FORM 4 SUBMISSION

Filing date: 12 Sep 2014
Reporting date: 09 Sep 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36561

PRIMARY DOCUMENT

Filing date: 31 Jul 2014
Reporting date: 29 Jul 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-36561

PRIMARY DOCUMENT

Filing date: 23 Jul 2014
Reporting date: 23 Jul 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

FORM 4 SUBMISSION

Filing date: 16 Jun 2014
Reporting date: 12 Jun 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36156

4

Filing date: 21 May 2014
Reporting date: 20 May 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36070

PRIMARY DOCUMENT

Filing date: 20 May 2014
Reporting date: 16 May 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

FORM 4 SUBMISSION

Filing date: 31 Mar 2014
Reporting date: 27 Mar 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-33103

FORM 4 SUBMISSION

Filing date: 21 Mar 2014
Reporting date: 19 Mar 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-33103

FORM 4 SUBMISSION

Filing date: 21 Feb 2014
Reporting date: 12 Feb 2014
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36156

FORM 4 -

Filing date: 04 Nov 2013
Reporting date: 04 Nov 2013
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-36156

3

Filing date: 29 Oct 2013
Reporting date: 29 Oct 2013
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-36070

PRIMARY DOCUMENT

Filing date: 24 Sep 2013
Reporting date: 23 Sep 2013
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-36070

PRIMARY DOCUMENT

Filing date: 17 Sep 2013
Reporting date: 17 Sep 2013
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34828

FORM 4 SUBMISSION

Filing date: 13 Sep 2013
Reporting date: 11 Sep 2013
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

FORM 4

Filing date: 14 Jun 2013
Reporting date: 13 Jun 2013
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-33103

FORM 4 SUBMISSION

Filing date: 13 Jun 2013
Reporting date: 12 Jun 2013
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

4

Filing date: 05 Jun 2013
Reporting date: 03 Jun 2013
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34828

FORM 4 SUBMISSION

Filing date: 23 May 2013
Reporting date: 21 May 2013
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

4

Filing date: 18 Jun 2012
Reporting date: 14 Jun 2012
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-33103

FORM 4 SUBMISSION

Filing date: 14 Jun 2012
Reporting date: 13 Jun 2012
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34828

FORM 4

Filing date: 24 May 2012
Reporting date: 22 May 2012
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-35347

4

Filing date: 17 Nov 2011
Reporting date: 16 Nov 2011
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-35347

3

Filing date: 15 Nov 2011
Reporting date: 15 Nov 2011
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-33103

FORM 4 SUBMISSION

Filing date: 17 Jun 2011
Reporting date: 15 Jun 2011
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34828

FORM 4

Filing date: 06 Jun 2011
Reporting date: 02 Jun 2011
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34828

FORM 4

Filing date: 05 Nov 2010
Reporting date: 03 Nov 2010
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34828

FORM 4

Filing date: 10 Aug 2010
Reporting date: 06 Aug 2010
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-34828

BRIAN G. ATWOOD FORM 3

Filing date: 02 Aug 2010
Reporting date: 02 Aug 2010
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-34828

FORM 3

Filing date: 02 Aug 2010
Reporting date: 02 Aug 2010
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-33103

FORM 4 SUBMISSION

Filing date: 17 Jun 2010
Reporting date: 16 Jun 2010
SEC evidence: Open document Open filing
Next action: Verify source filing

About this filer

Brian G. Atwood files with the SEC under CIK 0001266567. This page aggregates EDGAR filings and related ownership activity.

FAQ

What is a CIK?: 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.