NovaBridge director converts 5,770 stock units

The reported RSUs came from a 17,310-unit award granted in 2025, with equal annual vesting installments through October 15, 2028.

Rhea-AI Filing Summary

NovaBridge Biosciences director Ian Ying Woo reported converting 5,770 restricted share units into 5,770 ADSs on October 15, 2026. The ADSs correspond to 13,271 Ordinary Shares under the disclosed ratio of 10 ADSs for 23 Ordinary Shares. The reported post-transaction amounts were 11,540 ADSs for the restricted share units and 13,271 Ordinary Shares.

Insider Trade Summary

5,770 shares exercised/converted

Exercise 2 txns

Insider Woo Ian Ying

Role Director

Type	Security	Shares	Price	Value
Exercise	Restricted Share Units F3, F4, F5, F1, F6	5,770	$0.00	$0.00
Exercise	Ordinary Shares F1, F2, F3	13,271	--	--

Holdings After Transaction: Restricted Share Units — 11,540 contracts (Direct); Ordinary Shares — 13,271 shares (Direct)

Footnotes (6)

1. F1. The Ordinary Shares may be represented by American Depositary Shares ("ADS"). Each 10 ADSs represent 23 Ordinary Shares of the Issuer.
2. F2. Reported securities are represented by 5,770 ADSs.
3. F3. Each restricted stock unit ("RSU") represents a contingent right to receive one ADS.
4. F4. Reported securities represent ADSs.
5. F5. On October 15, 2025, the Reporting Person was granted 17,310 restricted share units ("RSUs"). The RSUs vest or shall vest over three years in equal annual installments on October 15, 2026, 2027 and 2028.
6. F6. Reported securities represent ADSs.

Key Figures

Restricted share units converted: 5,770 restricted share units ADSs received: 5,770 ADSs Ordinary Shares: 13,271 Ordinary Shares +4 more

7 metrics

Restricted share units converted 5,770 restricted share units Transaction reported October 15, 2026

ADSs received 5,770 ADSs On conversion of the restricted share units

Ordinary Shares 13,271 Ordinary Shares Reported acquired October 15, 2026

Post-transaction restricted share unit amount 11,540 ADSs Reported following the October 15, 2026 transaction

Restricted share units granted 17,310 restricted share units Granted October 15, 2025

Vesting schedule 3 equal annual installments October 15, 2026, 2027 and 2028

ADS-to-Ordinary-Share ratio 10 ADSs for 23 Ordinary Shares Ratio stated in the transaction footnotes

Key Terms

restricted share unit, American Depositary Shares, contingent right

3 terms

restricted share unit financial

"Each restricted share unit ("RSU") represents a contingent right"

A restricted share unit (RSU) is a promise by a company to give an employee a set number of company shares at a future date, typically after meeting time or performance conditions. For investors, RSUs matter because when they convert into actual shares they increase the number of shares outstanding (like unlocking more tickets in a game), which can dilute existing holders, and they align employee incentives with company performance, influencing behavior and long-term value.

American Depositary Shares financial

"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.

contingent right technical

"represents a contingent right to receive one ADS"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did NBP director Ian Ying Woo report?

Ian Ying Woo, a director of NovaBridge Biosciences, reported converting 5,770 restricted share units into 5,770 ADSs on October 15, 2026. Those ADSs correspond to 13,271 Ordinary Shares under the disclosed ratio of 10 ADSs for 23 Ordinary Shares.

When does Ian Ying Woo's NBP RSU award vest?

The 17,310 RSUs granted on October 15, 2025 were stated to vest in equal annual installments on October 15, 2026, 2027 and 2028.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/19/2026 - 04:15 PM EDT Accepted by SEC EDGAR 10/19/2026 - 04:15 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Woo Ian Ying

(Last) (First) (Middle)

C/O NOVABRIDGE BIOSCIENCES

2440 RESEARCH BOULEVARD, SUITE 400

(Street)

ROCKVILLE MARYLAND 20850

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/15/2026

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

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

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

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Ordinary Shares(1)	10/15/2026		M		13,271(2)	A	(3)	13,271(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Share Units	(3)	10/15/2026		M			5,770(4)	(5)	(5)	Ordinary Shares(1)	5,770(6)	$0	11,540(6)	D

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 5,770 ADSs.

3. Each restricted stock unit ("RSU") represents a contingent right to receive one ADS.

4. Reported securities represent ADSs.

5. On October 15, 2025, the Reporting Person was granted 17,310 restricted share units ("RSUs"). The RSUs vest or shall vest over three years in equal annual installments on October 15, 2026, 2027 and 2028.

6. Reported securities represent ADSs.

	/s/ Kyler Lei, Attorney-in-Fact	10/19/2026
	** 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 4 (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 4: SEC 1474 (03-26)