Filer Snapshot

Alfred Sandrock

CIK 0001577061. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.

Entity Type

Individual

Total Filings

79

Latest Filing

03 Apr 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 Forms 3/4/5

4 filed on 03 Apr 2026 for CIK 0001577061.

View Source Filing
Business address
14 Cambridge Center, Cambridge, MA, 02142
Top ownership issuers
BIIB VYGR

Filer intelligence

What SEC filings say about Alfred Sandrock

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 BIIB worth $2.52M.

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

BIIB

07 Jun 2021 · Head of Research & Development

$2.52M
Issuer page Owner page

VYGR

02 Apr 2026 · President and CEO

$1.83M
Issuer page Owner page

Latest update

What changed recently for Alfred Sandrock

Ownership report updated

Latest ownership report period: 02 Apr 2026. Open the source-backed page to inspect the fresh filing or facts context.

Update date

03 Apr 2026

Page type

Ownership filings

Latest period

02 Apr 2026

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

Open ownership filings Browse recent public updates

SEC filing record

CIK 0001577061 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
79
First seen
10 Jun 2013
Latest filing
03 Apr 2026
Entity
Individual

Observed form types

4 144 3 3/A

Primary evidence

Open SEC filing index Alfred Sandrock SEC filings Alfred Sandrock owner filings

Latest Filings

Recent SEC filings for Alfred Sandrock with direct links to document and filing folders.

4 File 001-37625

OWNERSHIP DOCUMENT

Filing date
03 Apr 2026
Reporting date
02 Apr 2026
SEC evidence
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144

144 filing

Filing date
02 Apr 2026
Reporting date
Not listed
SEC evidence
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4 File 001-37625

OWNERSHIP DOCUMENT

Filing date
26 Feb 2026
Reporting date
24 Feb 2026
SEC evidence
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144

144 filing

Filing date
24 Feb 2026
Reporting date
Not listed
SEC evidence
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4 File 001-37625

OWNERSHIP DOCUMENT

Filing date
20 Feb 2026
Reporting date
18 Feb 2026
SEC evidence
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144

144 filing

Filing date
18 Feb 2026
Reporting date
Not listed
SEC evidence
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4 File 001-37625

OWNERSHIP DOCUMENT

Filing date
11 Feb 2026
Reporting date
10 Feb 2026
SEC evidence
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4 File 001-37625

OWNERSHIP DOCUMENT

Filing date
10 Feb 2026
Reporting date
06 Feb 2026
SEC evidence
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144

144 filing

Filing date
10 Feb 2026
Reporting date
Not listed
SEC evidence
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4 File 001-37625

OWNERSHIP DOCUMENT

Filing date
04 Apr 2025
Reporting date
02 Apr 2025
SEC evidence
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144

144 filing

Filing date
02 Apr 2025
Reporting date
Not listed
SEC evidence
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4 File 001-37625

OWNERSHIP DOCUMENT

Filing date
24 Feb 2025
Reporting date
20 Feb 2025
SEC evidence
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144

144 filing

Filing date
20 Feb 2025
Reporting date
Not listed
SEC evidence
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4 File 001-37625

OWNERSHIP DOCUMENT

Filing date
12 Feb 2025
Reporting date
11 Feb 2025
SEC evidence
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144

144 filing

Filing date
11 Feb 2025
Reporting date
Not listed
SEC evidence
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4 File 001-37625

OWNERSHIP DOCUMENT

Filing date
03 Apr 2024
Reporting date
02 Apr 2024
SEC evidence
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144

144 filing

Filing date
02 Apr 2024
Reporting date
Not listed
SEC evidence
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4 File 001-37625

OWNERSHIP DOCUMENT

Filing date
22 Feb 2024
Reporting date
21 Feb 2024
SEC evidence
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144

144 filing

Filing date
21 Feb 2024
Reporting date
Not listed
SEC evidence
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4 File 001-37625

OWNERSHIP DOCUMENT

Filing date
16 Feb 2024
Reporting date
09 Feb 2024
SEC evidence
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4 File 001-37625

OWNERSHIP DOCUMENT

Filing date
05 Apr 2023
Reporting date
03 Apr 2023
SEC evidence
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4 File 001-37625

OWNERSHIP DOCUMENT

Filing date
22 Feb 2023
Reporting date
17 Feb 2023
SEC evidence
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4 File 001-37625

OWNERSHIP DOCUMENT

Filing date
23 Mar 2022
Reporting date
22 Mar 2022
SEC evidence
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4 File 001-37625

OWNERSHIP DOCUMENT

Filing date
09 Feb 2022
Reporting date
07 Feb 2022
SEC evidence
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3 File 001-37625

OWNERSHIP DOCUMENT

Filing date
09 Feb 2022
Reporting date
07 Feb 2022
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
09 Jun 2021
Reporting date
07 Jun 2021
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
22 Feb 2021
Reporting date
18 Feb 2021
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
17 Feb 2021
Reporting date
12 Feb 2021
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
29 Jan 2021
Reporting date
27 Jan 2021
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
06 Nov 2020
Reporting date
04 Nov 2020
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
19 Feb 2020
Reporting date
15 Feb 2020
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
14 Feb 2020
Reporting date
12 Feb 2020
SEC evidence
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4 File 000-22705

FORM 4 SUBMISSION

Filing date
23 May 2019
Reporting date
22 May 2019
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
26 Feb 2019
Reporting date
22 Feb 2019
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
20 Feb 2019
Reporting date
15 Feb 2019
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
14 Feb 2019
Reporting date
12 Feb 2019
SEC evidence
Open document Open filing
Next action
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4 File 000-22705

FORM 4 SUBMISSION

Filing date
25 May 2018
Reporting date
24 May 2018
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
28 Feb 2018
Reporting date
27 Feb 2018
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
27 Feb 2018
Reporting date
23 Feb 2018
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
26 Feb 2018
Reporting date
22 Feb 2018
SEC evidence
Open document Open filing
Next action
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
21 Feb 2018
Reporting date
20 Feb 2018
SEC evidence
Open document Open filing
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
20 Feb 2018
Reporting date
15 Feb 2018
SEC evidence
Open document Open filing
Next action
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
20 Feb 2018
Reporting date
15 Feb 2018
SEC evidence
Open document Open filing
Next action
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
14 Feb 2018
Reporting date
12 Feb 2018
SEC evidence
Open document Open filing
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4 File 000-22705

FORM 4 SUBMISSION

Filing date
08 Jun 2017
Reporting date
22 May 2017
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
04 Apr 2017
Reporting date
03 Apr 2017
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
03 Mar 2017
Reporting date
01 Mar 2017
SEC evidence
Open document Open filing
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
02 Mar 2017
Reporting date
28 Feb 2017
SEC evidence
Open document Open filing
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
17 Feb 2017
Reporting date
15 Feb 2017
SEC evidence
Open document Open filing
Next action
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4 File 000-22705

FORM 4 SUBMISSION

Filing date
24 May 2016
Reporting date
20 May 2016
SEC evidence
Open document Open filing
Next action
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
26 Feb 2016
Reporting date
25 Feb 2016
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 000-19311

PRIMARY DOCUMENT

Filing date
25 Feb 2016
Reporting date
23 Feb 2016
SEC evidence
Open document Open filing
Next action
Verify source filing
4 File 000-19311

PRIMARY DOCUMENT

Filing date
24 Feb 2016
Reporting date
22 Feb 2016
SEC evidence
Open document Open filing
Next action
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
19 Feb 2016
Reporting date
17 Feb 2016
SEC evidence
Open document Open filing
Next action
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
17 Feb 2016
Reporting date
12 Feb 2016
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
10 Feb 2016
Reporting date
08 Feb 2016
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
07 Dec 2015
Reporting date
03 Dec 2015
SEC evidence
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Next action
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4 File 000-22705

FORM 4 SUBMISSION

Filing date
04 Sep 2015
Reporting date
02 Sep 2015
SEC evidence
Open document Open filing
Next action
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3 File 000-22705

FORM 3 SUBMISSION

Filing date
04 Sep 2015
Reporting date
02 Sep 2015
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
30 Mar 2015
Reporting date
27 Mar 2015
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
03 Mar 2015
Reporting date
01 Mar 2015
SEC evidence
Open document Open filing
Next action
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
25 Feb 2015
Reporting date
23 Feb 2015
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
18 Feb 2015
Reporting date
17 Feb 2015
SEC evidence
Open document Open filing
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
17 Feb 2015
Reporting date
12 Feb 2015
SEC evidence
Open document Open filing
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
11 Feb 2015
Reporting date
10 Feb 2015
SEC evidence
Open document Open filing
Next action
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
10 Feb 2015
Reporting date
08 Feb 2015
SEC evidence
Open document Open filing
Next action
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
05 Dec 2014
Reporting date
03 Dec 2014
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
05 Mar 2014
Reporting date
04 Mar 2014
SEC evidence
Open document Open filing
Next action
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
04 Mar 2014
Reporting date
03 Mar 2014
SEC evidence
Open document Open filing
Next action
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
27 Feb 2014
Reporting date
26 Feb 2014
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
25 Feb 2014
Reporting date
23 Feb 2014
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
14 Feb 2014
Reporting date
12 Feb 2014
SEC evidence
Open document Open filing
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
12 Feb 2014
Reporting date
11 Feb 2014
SEC evidence
Open document Open filing
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
11 Feb 2014
Reporting date
08 Feb 2014
SEC evidence
Open document Open filing
Next action
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
05 Dec 2013
Reporting date
03 Dec 2013
SEC evidence
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Next action
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
23 Oct 2013
Reporting date
22 Oct 2013
SEC evidence
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4 File 000-19311

PRIMARY DOCUMENT

Filing date
18 Sep 2013
Reporting date
16 Sep 2013
SEC evidence
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3/A File 000-19311

PRIMARY DOCUMENT

Filing date
24 Jun 2013
Reporting date
03 Jun 2013
SEC evidence
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3 File 000-19311

PRIMARY DOCUMENT

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