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

Gene M. Zamiska

CIK 0001456385. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.

Entity Type

Individual

Total Filings

Latest Filing

26 Nov 2025

Industry

n/a

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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 filing 144

144 filed on 26 Nov 2025 for CIK 0001456385.

View Source Filing

Business address: C/O Western Digital Corporation, 5601 Great Oaks Parkway, San Jose, CA, 95119
Top holdings (ownership): WDC

Filer intelligence

What SEC filings say about Gene M. Zamiska

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

Forms 3/4/5 show insider context for WDC worth $2.22M.

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 No rows yet

Beneficial ownership and large-stake disclosures.

Open

Forms 3/4/5 1 rows

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

Open

Forms 3/4/5 insider context

WDC

18 Sep 2025 · SVP & Princ. Acctg Officer

$2.22M

Issuer page Owner page

Latest update

What changed recently for Gene M. Zamiska

Ownership report updated

Latest ownership report period: 18 Sep 2025. Open the source-backed page to inspect the fresh filing or facts context.

Update date

22 Sep 2025

Page type

Ownership filings

Latest period

18 Sep 2025

Ownership context was refreshed from SEC Forms 3/4/5 filed on 22 Sep 2025.

Open ownership filings Browse recent public updates

Filer Overview

Gene M. Zamiska has filed 96 SEC EDGAR filings since 19 Feb 2009. Common forms include 144, 4, 3.

Gene M. Zamiska SEC filings Gene M. Zamiska owner filings

Latest Filings

Recent SEC filings for Gene M. Zamiska with direct links to document and filing folders.

144

144 filing

Filing date: 26 Nov 2025
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 24 Nov 2025
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 21 Nov 2025
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 22 Sep 2025
Reporting date: 18 Sep 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 28 Aug 2025
Reporting date: 27 Aug 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 28 Aug 2025
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 27 Aug 2025
Reporting date: 25 Aug 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 26 Aug 2025
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 25 Aug 2025
Reporting date: 21 Aug 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 22 Aug 2025
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 21 Aug 2025
Reporting date: 20 Aug 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 21 Aug 2025
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 23 Jun 2025
Reporting date: 18 Jun 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 17 Jun 2025
Reporting date: 14 Jun 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 17 Jun 2025
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 06 Jun 2025
Reporting date: 05 Jun 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 05 Jun 2025
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 28 May 2025
Reporting date: 25 May 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 22 May 2025
Reporting date: 20 May 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 12 Mar 2025
Reporting date: 12 Mar 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 12 Mar 2025
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 10 Mar 2025
Reporting date: 06 Mar 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

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

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 03 Mar 2025
Reporting date: 28 Feb 2025
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 02 Dec 2024
Reporting date: 27 Nov 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 29 Nov 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 26 Nov 2024
Reporting date: 25 Nov 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 26 Nov 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 22 Nov 2024
Reporting date: 20 Nov 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 21 Nov 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 28 Oct 2024
Reporting date: 28 Oct 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 28 Oct 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 04 Sep 2024
Reporting date: 03 Sep 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 04 Sep 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 30 Aug 2024
Reporting date: 29 Aug 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 29 Aug 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

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

144

144 filing

Filing date: 27 Aug 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 22 Aug 2024
Reporting date: 20 Aug 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 21 Aug 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 18 Jun 2024
Reporting date: 17 Jun 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 17 Jun 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 17 Jun 2024
Reporting date: 14 Jun 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 30 May 2024
Reporting date: 29 May 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 29 May 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 28 May 2024
Reporting date: 27 May 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 22 May 2024
Reporting date: 20 May 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 21 May 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 09 Apr 2024
Reporting date: 08 Apr 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 08 Apr 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 05 Mar 2024
Reporting date: 01 Mar 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 01 Mar 2024
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 29 Feb 2024
Reporting date: 27 Feb 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 22 Feb 2024
Reporting date: 20 Feb 2024
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 28 Nov 2023
Reporting date: 27 Nov 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 21 Nov 2023
Reporting date: 20 Nov 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 07 Sep 2023
Reporting date: 06 Sep 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 06 Sep 2023
Reporting date: 04 Sep 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

144

144 filing

Filing date: 06 Sep 2023
Reporting date: Not listed
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 29 Aug 2023
Reporting date: 25 Aug 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 22 Aug 2023
Reporting date: 20 Aug 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 14 Aug 2023
Reporting date: 12 Aug 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 16 Jun 2023
Reporting date: 14 Jun 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 30 May 2023
Reporting date: 27 May 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 01 Mar 2023
Reporting date: 27 Feb 2023
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 29 Nov 2022
Reporting date: 27 Nov 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 08 Sep 2022
Reporting date: 07 Sep 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 06 Sep 2022
Reporting date: 03 Sep 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 30 Aug 2022
Reporting date: 27 Aug 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 23 Aug 2022
Reporting date: 20 Aug 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 15 Aug 2022
Reporting date: 12 Aug 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 15 Jun 2022
Reporting date: 14 Jun 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 06 May 2022
Reporting date: 04 May 2022
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 03 Nov 2021
Reporting date: 02 Nov 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 07 Sep 2021
Reporting date: 03 Sep 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 31 Aug 2021
Reporting date: 27 Aug 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 13 Aug 2021
Reporting date: 12 Aug 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 16 Jun 2021
Reporting date: 14 Jun 2021
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 08 Sep 2020
Reporting date: 03 Sep 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 13 Aug 2020
Reporting date: 12 Aug 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 21 Apr 2020
Reporting date: 17 Apr 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 23 Jan 2020
Reporting date: 21 Jan 2020
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-08703

PRIMARY DOCUMENT

Filing date: 24 Oct 2019
Reporting date: 22 Oct 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

3 File 001-08703

PRIMARY DOCUMENT

Filing date: 03 Sep 2019
Reporting date: 30 Aug 2019
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34501

PRIMARY DOCUMENT

Filing date: 21 Feb 2013
Reporting date: 15 Feb 2013
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34501

PRIMARY DOCUMENT

Filing date: 26 Dec 2012
Reporting date: 21 Dec 2012
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34501

PRIMARY DOCUMENT

Filing date: 21 Feb 2012
Reporting date: 17 Feb 2012
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34501

PRIMARY DOCUMENT

Filing date: 23 Feb 2011
Reporting date: 18 Feb 2011
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34501

PRIMARY DOCUMENT

Filing date: 11 Feb 2011
Reporting date: 10 Feb 2011
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34501

PRIMARY DOCUMENT

Filing date: 01 Feb 2011
Reporting date: 29 Jan 2011
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34501

PRIMARY DOCUMENT

Filing date: 01 Dec 2010
Reporting date: 29 Nov 2010
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34501

PRIMARY DOCUMENT

Filing date: 04 Aug 2010
Reporting date: 02 Aug 2010
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34501

PRIMARY DOCUMENT

Filing date: 22 Feb 2010
Reporting date: 19 Feb 2010
SEC evidence: Open document Open filing
Next action: Verify source filing

4 File 001-34501

PRIMARY DOCUMENT

Filing date: 02 Feb 2010
Reporting date: 29 Jan 2010
SEC evidence: Open document Open filing
Next action: Verify source filing

About this filer

Gene M. Zamiska files with the SEC under CIK 0001456385. 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.