Filer Snapshot

Mark Mason

CIK 0001487290. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.

Entity Type

Individual

Total Filings

54

Latest Filing

24 Feb 2026

Industry

n/a

Follow future filing-backed changes

Save this filer to return when a new filing changes the portfolio, large-stake, insider, or company context.

Save and revisit

Save this filer page

Create a free account to keep this page in your watchlists. After verification, we will save it automatically and open your saved research list.

Create free account and save this filer Already have an account? Sign in and save it

Best next click

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 24 Feb 2026 for CIK 0001487290.

View Source Filing
Business address
388 Greenwich Street, New York, NY, 10013

Filer intelligence

What SEC filings say about Mark Mason

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

Save filer

Quick read

  • Forms 3/4/5 show insider context for MSFT.

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

MSFT

30 Jan 2026

Issuer page Owner page

Latest update

What changed recently for Mark Mason

Ownership report updated

Latest ownership report period: 30 Jan 2026. Open the source-backed page to inspect the fresh filing or facts context.

Update date

03 Feb 2026

Page type

Ownership filings

Latest period

30 Jan 2026

Ownership context was refreshed from SEC Forms 3/4/5 filed on 03 Feb 2026.

Open ownership filings Browse recent public updates

Filer Overview

Mark Mason has filed 54 SEC EDGAR filings since 30 Mar 2010. Common forms include 4, 144, 3, 4/A.

Mark Mason SEC filings Mark Mason owner filings

Latest Filings

Recent SEC filings for Mark Mason with direct links to document and filing folders.

4 File 001-09924

4

Filing date
24 Feb 2026
Reporting date
20 Feb 2026
SEC evidence
Open document Open filing
Next action
Verify source filing
144

144 filing

Filing date
20 Feb 2026
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

4

Filing date
13 Feb 2026
Reporting date
11 Feb 2026
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-37845

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
03 Feb 2026
Reporting date
30 Jan 2026
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

4

Filing date
20 Jan 2026
Reporting date
20 Jan 2026
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-37845

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
05 Dec 2025
Reporting date
04 Dec 2025
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-37845

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
12 Sep 2025
Reporting date
10 Sep 2025
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-37845

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
11 Jun 2025
Reporting date
10 Jun 2025
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

4

Filing date
24 Feb 2025
Reporting date
21 Feb 2025
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

4

Filing date
18 Feb 2025
Reporting date
13 Feb 2025
SEC evidence
Open document Open filing
Next action
Verify source filing
144

144 filing

Filing date
14 Feb 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-37845

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
03 Feb 2025
Reporting date
31 Jan 2025
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

4

Filing date
22 Jan 2025
Reporting date
20 Jan 2025
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-37845

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
10 Dec 2024
Reporting date
09 Dec 2024
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-37845

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
09 Sep 2024
Reporting date
06 Sep 2024
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-37845

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
07 Jun 2024
Reporting date
07 Jun 2024
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

4

Filing date
27 Feb 2024
Reporting date
23 Feb 2024
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

4

Filing date
20 Feb 2024
Reporting date
15 Feb 2024
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-37845

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
01 Feb 2024
Reporting date
31 Jan 2024
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

4

Filing date
23 Jan 2024
Reporting date
20 Jan 2024
SEC evidence
Open document Open filing
Next action
Verify source filing
3 File 001-37845

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
08 Dec 2023
Reporting date
07 Dec 2023
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

FORM 4 SUBMISSION

Filing date
21 Feb 2023
Reporting date
16 Feb 2023
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

FORM 4 SUBMISSION

Filing date
24 Jan 2023
Reporting date
20 Jan 2023
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

FORM 4 SUBMISSION

Filing date
14 Feb 2022
Reporting date
10 Feb 2022
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

FORM 4 SUBMISSION

Filing date
24 Jan 2022
Reporting date
20 Jan 2022
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

FORM 4 SUBMISSION

Filing date
07 May 2021
Reporting date
07 May 2021
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

FORM 4 SUBMISSION

Filing date
12 Feb 2021
Reporting date
11 Feb 2021
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

FORM 4 SUBMISSION

Filing date
22 Jan 2021
Reporting date
20 Jan 2021
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

FORM 4 SUBMISSION

Filing date
14 Feb 2020
Reporting date
13 Feb 2020
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-09924

FORM 4 SUBMISSION

Filing date
22 Jan 2020
Reporting date
20 Jan 2020
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
18 Mar 2019
Reporting date
15 Mar 2019
SEC evidence
Open document Open filing
Next action
Verify source filing
3 File 001-09924

FORM 3 SUBMISSION

Filing date
04 Mar 2019
Reporting date
23 Feb 2019
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
18 Dec 2018
Reporting date
14 Dec 2018
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
18 Sep 2018
Reporting date
14 Sep 2018
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
18 Jun 2018
Reporting date
14 Jun 2018
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
18 May 2018
Reporting date
16 May 2018
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
19 Mar 2018
Reporting date
16 Mar 2018
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
18 Dec 2017
Reporting date
15 Dec 2017
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
18 Sep 2017
Reporting date
15 Sep 2017
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
19 Jun 2017
Reporting date
15 Jun 2017
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
19 May 2017
Reporting date
17 May 2017
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
24 May 2016
Reporting date
20 May 2016
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
21 May 2015
Reporting date
20 May 2015
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
22 May 2014
Reporting date
21 May 2014
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
24 May 2013
Reporting date
22 May 2013
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
17 May 2012
Reporting date
16 May 2012
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
20 Dec 2011
Reporting date
19 Dec 2011
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
15 Nov 2011
Reporting date
15 Nov 2011
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

PRIMARY DOCUMENT

Filing date
21 Apr 2011
Reporting date
20 Apr 2011
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

FORM 4 SUBMISSION

Filing date
19 Apr 2010
Reporting date
15 Apr 2010
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

FORM 4 SUBMISSION

Filing date
08 Apr 2010
Reporting date
07 Apr 2010
SEC evidence
Open document Open filing
Next action
Verify source filing
4/A File 001-34680

FORM 4/A SUBMISSION

Filing date
05 Apr 2010
Reporting date
01 Apr 2010
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 001-34680

FORM 4 SUBMISSION

Filing date
02 Apr 2010
Reporting date
01 Apr 2010
SEC evidence
Open document Open filing
Next action
Verify source filing
3 File 001-34680

FORM 3 SUBMISSION

Filing date
30 Mar 2010
Reporting date
31 Mar 2010
SEC evidence
Open document Open filing
Next action
Verify source filing

About this filer

Mark Mason files with the SEC under CIK 0001487290. 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.
We use cookies and similar technologies to provide certain features, enhance the user experience and, if you allow them, measure engagement and deliver advertising. Analytics and marketing storage stay off until you grant consent. By clicking on "Agree and continue", you declare your consent to the use of the selected optional cookies. Here you can make detailed settings or revoke your consent (in part if necessary) with effect for the future. For further information, please refer to our Privacy Policy .