[Form 3/A] NovaBridge Biosciences Amended Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

NovaBridge Biosciences executive Xu Cong Claire filed an amended Form 3 to correct a typographical error in her reported holdings. She is now shown as beneficially owning 284,266 Ordinary Shares, which are represented by 123,594 American Depositary Shares (ADSs). Each 10 ADSs correspond to 23 Ordinary Shares. The amendment states that all other information from the original Form 3 remains unchanged and does not report any new share purchases, sales, or option exercises.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Xu Cong Claire

Role See Remarks

Type	Security	Shares	Price	Value
holding	Ordinary Shares	--	--	--

Holdings After Transaction: Ordinary Shares — 284,266 shares (Direct)

Footnotes (1)

1. The Ordinary Shares may be represented by American Depositary Shares ("ADS"). Each 10 ADSs represent 23 Ordinary Shares of the Issuer. Reported securities are represented by 123,594 ADSs. This Form 3 is being filed to correct a typographical error in the number of Ordinary Shares beneficially owned and underlying the 123,594 ADSs held by the Reporting Person. All other information disclosed in the original Form 3 filed on March 18, 2026, remains unchanged.

Key Figures

Beneficial ownership: 284,266 Ordinary Shares ADS holdings: 123,594 ADSs ADS to Ordinary ratio: 10 ADSs = 23 Ordinary Shares +1 more

4 metrics

Beneficial ownership 284,266 Ordinary Shares Ordinary Shares beneficially owned following correction

ADS holdings 123,594 ADSs ADSs representing the reported Ordinary Shares

ADS to Ordinary ratio 10 ADSs = 23 Ordinary Shares Representation ratio for NovaBridge ADSs

Form date March 18, 2026 Date referenced for the original Form 3 filing

Key Terms

American Depositary Shares, beneficially owned, Form 3, Ordinary Shares

4 terms

American Depositary Shares financial

"The Ordinary Shares may be represented by American Depositary Shares ("ADS")."

American depositary shares (ADSs) are a way for investors in the United States to buy shares of foreign companies without dealing with international markets directly. They represent ownership in a foreign company's stock and are traded on U.S. stock exchanges, making it easier for American investors to buy, sell, and own parts of companies from around the world.

beneficially owned financial

"to correct a typographical error in the number of Ordinary Shares beneficially owned"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Form 3 regulatory

"This Form 3 is being filed to correct a typographical error"

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.

Ordinary Shares financial

"The Ordinary Shares may be represented by American Depositary Shares"

Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.

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

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Xu Cong Claire

(Last) (First) (Middle)

C/O NOVABRIDGE BIOSCIENCES,

2440 RESEARCH BOULEVARD, SUITE 400

(Street)

ROCKVILLE MARYLAND 20850

(City) (State) (Zip)

UNITED STATES

(Country)

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

3. Issuer Name and Ticker or Trading Symbol
NovaBridge Biosciences [ NBP ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)
03/18/2026

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

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

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)
Ordinary Shares(1)	284,266(2)(3)	D

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:

1. The Ordinary Shares may be represented by American Depositary Shares ("ADS"). Each 10 ADSs represent 23 Ordinary Shares of the Issuer.

2. Reported securities are represented by 123,594 ADSs.

3. This Form 3 is being filed to correct a typographical error in the number of Ordinary Shares beneficially owned and underlying the 123,594 ADSs held by the Reporting Person. All other information disclosed in the original Form 3 filed on March 18, 2026, remains unchanged.

Remarks:

Senior Vice President, Clinical Development

	/s/ Xi-Yong (Sean) Fu as attorney-in-fact	04/10/2026
	** 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 NovaBridge Biosciences (NBP) disclose in this Form 3/A?

The Form 3/A updates Xu Cong Claire’s reported holdings in NovaBridge Biosciences. It corrects a prior typographical error and now shows beneficial ownership of 284,266 Ordinary Shares represented by 123,594 ADSs, with all other details from the original Form 3 unchanged.

How many NovaBridge Biosciences (NBP) shares does Xu Cong Claire now report?

Xu Cong Claire now reports beneficial ownership of 284,266 Ordinary Shares of NovaBridge Biosciences. These holdings are represented by 123,594 American Depositary Shares (ADSs), reflecting a correction from the original Form 3 rather than any new share purchases or sales.

What is the ADS to Ordinary Share ratio for NovaBridge Biosciences (NBP)?

Each 10 NovaBridge Biosciences American Depositary Shares represent 23 Ordinary Shares. This fixed ratio means the 123,594 ADSs reported for Xu Cong Claire correspond to 284,266 Ordinary Shares, as clarified in the Form 3/A amendment footnotes.

Does this NovaBridge Biosciences (NBP) Form 3/A show any insider buying or selling?

The Form 3/A does not show any insider buying or selling activity. It is described as a correction to a typographical error in the number of Ordinary Shares underlying the 123,594 ADSs previously reported, with no new transactions indicated.

Why did NovaBridge Biosciences (NBP) file an amended Form 3 for Xu Cong Claire?

The amended Form 3 was filed to correct a typographical error in the previously reported number of Ordinary Shares. It clarifies the correct beneficial ownership underlying the 123,594 ADSs held by Xu Cong Claire, while leaving all other originally reported information unchanged.