Entity Type
Individual
Filer Snapshot
Kai Sun
CIK 0001998340. SEC filing timeline plus parsed ownership intelligence from 13F, 13D/G, and Forms 3/4/5 where available.
Total Filings
5
Latest Filing
27 Mar 2026
Industry
n/a
Filing-backed research brief
Start with the SEC data that changes for this CIK
Latest signal: 13D/G stake for HSAI. Each card links back to the PortfolioSavvy page where the filing evidence is closest.
Latest 13F portfolio
—
No parsed 13F portfolio row yet.
Browse latest 13FLargest parsed holding
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Populates from the latest parsed 13F information table.
Open holding13D/G large stake
HSAI
24 Apr 2025 · 20% ownership
Open 13D/GInsider / owner context
HSAI
25 Mar 2026
Open owner pageSave this filer page
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Source: SEC Forms 3/4/5
View Source Filing
4 filed on 27 Mar 2026 for CIK 0001998340.
- Business address
- 9 Th Fl, Bldg L2 B, 1588 Zhugang Rd, Hongqiao World Center, Shanghai, China, 201702
- Schedule 13D positions
-
HSAI
Identity
SEC ownership signals
Filer intelligence
What SEC filings say about Kai Sun
A compact read of parsed XML filings. 13F, 13D/G, and Forms 3/4/5 are shown separately because they answer different ownership questions.
Quick read
- 1 recent 13D/G stake row found; top row is HSAI at 20% ownership.
- Forms 3/4/5 show insider context for HSAI.
SEC source mix
Counts show available parsed rows, not one combined ownership total.
13D/G large-stake context
HSAI
24 Apr 2025 · Class B ordinary shares, par value of $0.0001 per share
Forms 3/4/5 insider context
HSAI
25 Mar 2026 · Chief Scientist · 10% owner
Latest update
What changed recently for Kai Sun
Latest ownership report period: 25 Mar 2026. Open the source-backed page to inspect the fresh filing or facts context.
Update date
27 Mar 2026
Page type
Ownership filings
Latest period
25 Mar 2026
Ownership context was refreshed from SEC Forms 3/4/5 filed on 27 Mar 2026.
SEC filing record
CIK 0001998340 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 Feb 2024
Latest filing
27 Mar 2026
Entity
Individual
Observed form types
4
3
SCHEDULE 13D
144
SC 13G
Latest Filings
Showing the latest 5 of 5 SEC filings for Kai Sun.
4
File 001-41611
OWNERSHIP DOCUMENT
- Filing date
- 27 Mar 2026
- Reporting date
- 25 Mar 2026
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
3
File 001-41611
OWNERSHIP DOCUMENT
- Filing date
- 18 Mar 2026
- Reporting date
- 18 Mar 2026
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
SCHEDULE 13D
SCHEDULE 13D filing
- Filing date
- 30 Apr 2025
- Reporting date
- Not listed
- SEC evidence
- Open document Open filing Open XBRL
- Next action
- Verify source filing
144
144 filing
- Filing date
- 13 Mar 2025
- Reporting date
- Not listed
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing
SC 13G
SC 13G
- Filing date
- 07 Feb 2024
- Reporting date
- Not listed
- SEC evidence
- Open document Open filing
- Next action
- Verify source filing