Filer Snapshot

Margaret A. Horn

CIK 0001294192. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.

Entity type

Individual

Total filings

76

Latest filing

19 Mar 2026

Industry

n/a

Filing-backed research brief

Start with the SEC data that changes for this CIK

Latest signal: Forms 3/4/5 owner position for RVMD. Each card links back to the PortfolioSavvy page where the filing evidence is closest.

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Largest parsed holding

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Populates from the latest parsed 13F information table.

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13D/G large stake

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

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Source: SEC Forms 3/4/5

4 filed on 19 Mar 2026 for CIK 0001294192.

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Identity
Business address
925 Page Mill Road, Palo Alto, CA, 94304
SEC ownership signals
Parsed ownership coverage

Form 3/4/5 holdings value

$15.71M

Estimated from parsed insider ownership filings when values are available.

Top disclosed positions
RVMD SGMO

Filer intelligence

What SEC filings say about Margaret A. Horn

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 RVMD worth $15.68M.

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 No rows yet

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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Forms 3/4/5 insider context

RVMD

17 Mar 2026 · Chief Operating Officer

$15.68M
Issuer page Owner page

SGMO

12 Jun 2025

$38K
Issuer page Owner page

Latest update

What changed recently for Margaret A. Horn

Ownership report updated

Latest ownership report period: 17 Mar 2026. Open the source-backed page to inspect the fresh filing or facts context.

Update date

19 Mar 2026

Page type

Ownership filings

Latest period

17 Mar 2026

Ownership context was refreshed from SEC Forms 3/4/5 filed on 19 Mar 2026.

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SEC filing record

CIK 0001294192 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
76
First seen
17 Jun 2004
Latest filing
19 Mar 2026
Entity
Individual

Observed form types

4 144 144/A 3

Primary evidence

Open SEC filing index Margaret A. Horn SEC filings Margaret A. Horn owner filings

Latest Filings

Showing the latest 12 of 68 SEC filings for Margaret A. Horn.

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4 File 001-39219

4 filing

Filing date
19 Mar 2026
Reporting date
17 Mar 2026
SEC evidence
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144

144 filing

Filing date
13 Mar 2026
Reporting date
Not listed
SEC evidence
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4 File 001-39219

4 filing

Filing date
03 Mar 2026
Reporting date
01 Mar 2026
SEC evidence
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4 File 001-39219

4 filing

Filing date
09 Jan 2026
Reporting date
07 Jan 2026
SEC evidence
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144

144 filing

Filing date
07 Jan 2026
Reporting date
Not listed
SEC evidence
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4 File 001-39219

4 filing

Filing date
18 Dec 2025
Reporting date
16 Dec 2025
SEC evidence
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144

144 filing

Filing date
12 Dec 2025
Reporting date
Not listed
SEC evidence
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4 File 001-39219

4 filing

Filing date
18 Sep 2025
Reporting date
16 Sep 2025
SEC evidence
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144

144 filing

Filing date
15 Sep 2025
Reporting date
Not listed
SEC evidence
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4 File 001-39219

4 filing

Filing date
18 Jun 2025
Reporting date
16 Jun 2025
SEC evidence
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4 File 000-30171

4 filing

Filing date
16 Jun 2025
Reporting date
12 Jun 2025
SEC evidence
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144

144 filing

Filing date
13 Jun 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
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