Comparable stake leader
Fong Shih-Song
SEC ownership of Ostin Technology Group Co., Ltd.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001803407.
Disclosed value leader
Liao Yen-Kai
Comparable rows
6/14
Latest evidence
31 Mar 2026
- Public ticker
- OST on Nasdaq
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Fong Shih-Song
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
6 of 14
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
Fong Shih-Song
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001803407
- Issuer location
- Nanjiang Jiangsu, China
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Ostin Technology Group Co., Ltd. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Fong Shih-Song
Disclosed value leader
Liao Yen-Kai
Comparable rows
6/14
Latest evidence
31 Mar 2026
13D/G
13F
3/4/5
Lead comparable stake: 4.5%
8 rows are not safely comparable across share classes.
13D/G row: Fong Shih-Song
Showing 1-8 of 14 holder rows.
Quick read
Fong Shih-Song leads the comparable SEC ownership view at 4.5%.
6 of 14 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Fong Shih-Song's linked filing trail.
Comparable ownership
Top 5
Fong Shih-Song
4.5%
Hon Devid
4.3%
Liao Yen-Kai
3.6%
Lo Sheng-Lun
3.6%
Hendri Jones
3%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 14 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Fong Shih-Song |
13D/G
|
4.5%
|
$21,021,788
4,832,595 shares
|
-$9,602,212 | 09 Jun 2025 |
| Hon Devid |
13D/G
|
4.3%
|
$19,964,112
4,589,451 shares
|
-$12,747,871 | 09 Jun 2025 |
| Liao Yen-Kai |
13D/G
|
3.6%
|
$21,659,040
3,888,517 shares
|
-$15,793,195 | 19 Jun 2025 |
| Lo Sheng-Lun |
13D/G
|
3.6%
|
$21,244,169
3,814,034 shares
|
-$17,968,631 | 19 Jun 2025 |
| Hendri Jones |
13D/G
|
3%
|
$14,162,660
3,255,784 shares
|
-$17,157,348 | 09 Jun 2025 |
| Hsiao Tzu-Kai |
13D/G
|
2.7%
|
$12,507,046
2,875,183 shares
|
-$17,420,945 | 09 Jun 2025 |
| CITADEL ADVISORS LLC |
13F
Company
|
—
class O/S missing
|
$44,051
34,652 shares
|
— | 31 Mar 2026 |
| HRT FINANCIAL LP |
13F
Company
|
—
class O/S missing
|
$22,000
13,551 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 03 Aug 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-3 of 3 reporting-owner rows connected to Ostin Technology Group Co., Ltd.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
3
Largest Forms 3/4/5 holder
Xiao Hong Yin
Net 12M change
$0
Latest report
18 Mar 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Xiao Hong Yin | Director and Secretary, Director | $6,510 | Mixed | 18 Mar 2026 | ||
| John Carl Mein | Director | Mixed | 18 Mar 2026 | |||
| Rongguo Cui | Director | Mixed | 18 Mar 2026 |
Recent insider transactions for Ostin Technology Group Co., Ltd.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Xiao Hong Yin | OST | Class A Ordinary Share | 0 | 3,850 | 18 Mar 2026 | Xiaohong Yin, sole owner/director of JQZY, holds voting power over its securities. |
* marks a reported price that did not pass the local price check.