Ostin Technology (NASDAQ: OST) director CUI RONGGUO files initial Form 3

Rhea-AI Filing Summary

Ostin Technology Group Co., Ltd. director CUI RONGGUO filed an initial insider ownership report on Form 3. The filing lists this person as a director but does not report any stock transactions or specific share holdings in the provided data.

Key Figures

Buy transactions: 0 Sell transactions: 0 Net buy/sell shares: 0

3 metrics

Buy transactions 0 Form 3 transactionSummary buyCount

Sell transactions 0 Form 3 transactionSummary sellCount

Net buy/sell shares 0 Form 3 transactionSummary netBuySellShares

Key Terms

Form 3, insider ownership, derivative securities

3 terms

Form 3 regulatory

"filed an initial insider ownership report on Form 3"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

insider ownership financial

"filed an initial insider ownership report on Form 3"

derivative securities financial

"no options, warrants, or other derivative positions are reported"

Financial contracts whose value is tied to the price or performance of another asset, such as a stock, bond, commodity, index, or currency; examples include options, futures and swaps. They matter to investors because they let you protect against price swings, bet on future moves or gain larger exposure with less upfront cash—like using a lever or insurance policy on an investment—so they can amplify gains and losses and help manage portfolio risk.

Understanding Insider Trading Forms →

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

CUI RONGGUO

(Last) (First) (Middle)

BUILDING 2, 101, 1 KECHUANG ROAD

QIXIA DISTRICT

(Street)

NANJING JIANGSU PROVINCE 210046

(City) (State) (Zip)

CHINA

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

3. Issuer Name and Ticker or Trading Symbol
Ostin Technology Group Co., Ltd. [ OST ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

No securities are beneficially owned.

	/s/ Rongguo Cui	04/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)

FAQ

What does the OST Form 3 filing by CUI RONGGUO report?

It reports that CUI RONGGUO is a director of Ostin Technology Group Co., Ltd.. The provided data shows no reported stock transactions or detailed share holdings in this initial Form 3 snapshot.

Are any OST shares bought or sold in this Form 3 filing?

No. The Form 3 summary shows zero buy, sell, acquire, or dispose transactions. All related share counts, including net buy or sell shares, are listed as 0 in the transaction summary section.

Does the OST Form 3 show any derivative securities for CUI RONGGUO?

No. The derivativeSummary section is empty, and derivativeTransactionCount is 0. This indicates no options, warrants, or other derivative positions are reported in this particular Form 3 snapshot.

What is the net trading direction in this OST Form 3 data?

The transaction summary shows a netBuySellShares value of 0 and a netBuySellDirection of neutral. This reflects that no purchases, sales, or other equity transactions are reported in the filing data provided.

Does the OST Form 3 include any tax, gift, or restructuring entries?

No. Counts for giftShares, taxWithholdingShares, and restructuringShares are all 0. This means the Form 3 snapshot includes no gifts, tax-withholding dispositions, or restructuring-related transfers.