Filer Snapshot

John D. Halpern

CIK 0001234950. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.

Entity Type

Individual

Total Filings

13

Latest Filing

15 May 2026

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 Schedule 13D/G

SCHEDULE 13G/A filed on 15 May 2026 for CIK 0001234950.

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Top holdings (ownership)
ERNA and CMRA
Top holdings (Schedule 13G)
ERNA

Filer intelligence

What SEC filings say about John D. Halpern

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

  • 2 recent 13D/G stake rows found; top row is ERNA at 5.6% ownership.
  • Forms 3/4/5 show insider context for ERNA worth $1.12M.

SEC source mix

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

XML parsed
13F portfolio No rows yet

Quarterly institutional portfolio holdings.

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13D/G stakes 2 rows

Beneficial ownership and large-stake disclosures.

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Forms 3/4/5 2 rows

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

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13D/G large-stake context

ERNA

10 Feb 2026 · Common Stock, par value $0.005 per share

5.6%
Issuer page 13D/G history

ERNA

31 Mar 2025 · Common Stock, par value $0.005 per share

9.6%
Issuer page 13D/G history

Forms 3/4/5 insider context

ERNA

02 Dec 2022 · 10% owner

$1.12M
Issuer page Owner page

CMRA

27 Dec 2023

$77.1K
Issuer page Owner page

Latest update

What changed recently for John D. Halpern

New filing available

Latest Schedule 13D/G period: 10 Feb 2026. Open the source-backed page to inspect the fresh filing or facts context.

Update date

15 May 2026

Page type

Filer profile

Latest period

10 Feb 2026

Schedule 13D/G context is visible from filings filed on 15 May 2026.

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Filer Overview

John D. Halpern has filed 13 SEC EDGAR filings since 02 Oct 2003. Common forms include SCHEDULE 13G/A, SC 13G/A, 3, 4 and more.

John D. Halpern SEC filings John D. Halpern 13D/G history John D. Halpern owner filings

Latest Filings

Recent SEC filings for John D. Halpern with direct links to document and filing folders.

SCHEDULE 13G/A

SCHEDULE 13G/A filing

Filing date
15 May 2026
Reporting date
Not listed
SEC evidence
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SCHEDULE 13G/A

SCHEDULE 13G/A filing

Filing date
15 May 2025
Reporting date
Not listed
SEC evidence
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SCHEDULE 13G/A

SCHEDULE 13G/A filing

Filing date
14 Feb 2025
Reporting date
Not listed
SEC evidence
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SC 13G/A

SC 13G/A

Filing date
31 Jan 2024
Reporting date
Not listed
SEC evidence
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3 File 001-41403

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
08 Jan 2024
Reporting date
27 Dec 2023
SEC evidence
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SC 13G/A

SC 13G/A

Filing date
31 Jan 2023
Reporting date
Not listed
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4 File 001-11460

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filing date
05 Dec 2022
Reporting date
02 Dec 2022
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SC 13G/A

SC 13G/A

Filing date
05 Dec 2022
Reporting date
Not listed
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SC 13G

SC 13G

Filing date
24 May 2021
Reporting date
Not listed
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3 File 001-11460

PRIMARY DOCUMENT

Filing date
19 May 2021
Reporting date
25 Mar 2021
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About this filer

John D. Halpern files with the SEC under CIK 0001234950. 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.
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