Filer Snapshot

Tzuo Tien

CIK 0001735409. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.

Entity type

Individual

Total filings

5

Latest filing

19 Feb 2025

Industry

n/a

Filing-backed research brief

Start with the SEC data that changes for this CIK

Latest signal: 13D/G stake for ZUO. Each card links back to the PortfolioSavvy page where the filing evidence is closest.

Open 13D/G history Save page

Largest parsed holding

—

Populates from the latest parsed 13F information table.

Open holding

13D/G large stake

ZUO

14 Feb 2025 · 0% ownership

Open 13D/G

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
Source: SEC Schedule 13D/G

SCHEDULE 13D/A filed on 19 Feb 2025 for CIK 0001735409.

View source filing
Ownership signals CIK-linked ownership evidence from parsed SEC filings. 1 signal
Parsed SEC ownership signals

Parsed SEC ownership coverage

These bars compare filing-backed value available in each disclosure family. Read them as separate lenses, not as one combined ownership total.

Forms 3/4/5 positions$682.5K

Reporting-owner positions with enough filing detail to estimate value.

Forms 3/4/5 position value

3/4/5
$682.5K

Estimated from parsed Forms 3/4/5 when filings include enough share and price data.

Largest linked holdings

Largest issuer positions linked to this CIK across parsed 13F, 13D/G, and Forms 3/4/5 records.

AMPL

Largest active 13D stakes

Active large-stake positions disclosed in parsed Schedule 13D filings.

ZUO
How to read these SEC ownership signals
  • Read each filing family separately: 13F portfolios, 13D/G large stakes, and Forms 3/4/5 owner positions answer different SEC disclosure questions.
  • Open the linked research path when you need the filing, CIK, issuer, or CUSIP trail behind a value.
At a glance Names, identifiers, and filing context for this profile. 1 identity field
Business address
C/O Amplitude, Inc., 201 Third Street, Suite 200, San Francisco, CA, 94103

Filer intelligence

What SEC filings say about Tzuo Tien

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

  • 1 recent 13D/G stake row found; top row is ZUO at 0% ownership.
  • Forms 3/4/5 show insider context for AMPL worth $682.5K.

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 1 rows

Beneficial ownership and large-stake disclosures.

Open
Forms 3/4/5 3 rows

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

Open

13D/G large-stake context

ZUO

14 Feb 2025 · Class A Common Stock, par value $0.0001 per share

0%
Issuer page 13D/G history

Forms 3/4/5 insider context

AMPL

05 Apr 2026

$682.5K
Issuer page Owner page

ZUO

14 Feb 2025 · Chairman and CEO

$0
Issuer page Owner page

VG

21 Jul 2022

Issuer page Owner page

Latest update

What changed recently for Tzuo Tien

Ownership report updated

Latest ownership report period: 05 Apr 2026. Open the source-backed page to inspect the fresh filing or facts context.

Update date

07 Apr 2026

Page type

Ownership filings

Latest period

05 Apr 2026

Ownership context was refreshed from SEC Forms 3/4/5 filed on 07 Apr 2026.

Open ownership filings Browse recent public updates

SEC filing record

CIK 0001735409 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
5
First seen
07 Dec 2023
Latest filing
19 Feb 2025
Entity
Individual

Observed form types

4 SCHEDULE 13D/A

CIK-linked evidence first

Tzuo Tien SEC filings Tzuo Tien 13D/G history Tzuo Tien owner filings Open SEC filing index

Latest Filings

Showing the latest 5 of 5 SEC filings for Tzuo Tien.

SCHEDULE 13D/A

SCHEDULE 13D/A filing

Filing date
19 Feb 2025
Reporting date
Not listed
SEC evidence
Open document Open filing
Next action
Verify source filing
4

4 filing

Filing date
26 Jan 2024
Reporting date
25 Jan 2024
SEC evidence
Open document Open filing
Next action
Verify source filing
4

4 filing

Filing date
24 Jan 2024
Reporting date
22 Jan 2024
SEC evidence
Open document Open filing
Next action
Verify source filing
4

4 filing

Filing date
03 Jan 2024
Reporting date
31 Dec 2023
SEC evidence
Open document Open filing
Next action
Verify source filing
4

4 filing

Filing date
07 Dec 2023
Reporting date
06 Dec 2023
SEC evidence
Open document Open filing
Next action
Verify source filing
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. Manage preferences to update or revoke optional consent for future visits. For more information, see our Privacy Policy .