How do the restricted share units for NovaBridge Biosciences (NBP) vest?

The 181,280 RSUs vest over four years. One-fourth vests on September 3, 2026, and the remaining three-fourths vest ratably over the next 12 quarters, on the third day of each third month, providing gradual, time-based vesting.

NovaBridge Biosciences awards options and RSUs

NovaBridge Biosciences director and Chief Business Development Officer Cao Sean Wuxiong received new equity awards.

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Rhea-AI Filing Summary

NovaBridge Biosciences director and Chief Business Development Officer Cao Sean Wuxiong received new equity awards. He was granted 181,290 employee share options to buy Ordinary Shares (via American Depositary Shares) at an exercise price of $1.53 per ADS, expiring on June 22, 2036. These options vest in eight equal quarterly installments only after the 30-trading-day weighted average price of the company’s ADS is at or above $8.00.

He also received 181,280 restricted share units, each representing a contingent right to receive one ADS. These RSUs vest over four years, with one-fourth vesting on September 3, 2026 and the remainder vesting ratably over the following 12 quarters.

Insider Trade Summary

Grant/Award: 362,570 shares

Grant/Award 2 txns

Insider Cao Sean Wuxiong

Role Chief Bus. Development Officer

Type	Security	Shares	Price	Value
Grant/Award	Restricted Share Units	181,280	$0.00	$0.00
Grant/Award	2025 Employee Share Option (right to buy)	181,290	$0.00	$0.00

Holdings After Transaction: Restricted Share Units — 181,280 contracts (Direct); 2025 Employee Share Option (right to buy) — 181,290 contracts (Direct)

Footnotes (5)

F1. Each restricted stock unit ("RSU") represents a contingent right to receive one American Depositary Shares ("ADS").
F2. Number of underlying securities and exercise price expressed in terms of ADSs.
F3. The RSUs shall vest over four years, with one-fourth vesting on September 3, 2026 and the balance vesting ratably over the subsequent 12 quarters on the third day of each third month.
F4. The Ordinary Shares may be represented by ADSs. Each 10 ADSs represent 23 Ordinary Shares of the Issuer.
F5. The option vests, if at all, in eight equal quarterly installments following the date on which the 30-trading-day weighted average price of the Issuer's ADS (based on trading days only) is at or above US$8.00.

Key Figures

Employee share options granted: 181,290 options Option exercise price: $1.53 per ADS Option expiration: June 22, 2036 +4 more

7 metrics

Employee share options granted 181,290 options Grant on June 22, 2026 to Cao Sean Wuxiong

Option exercise price $1.53 per ADS Exercise price for 2025 Employee Share Option grant

Option expiration June 22, 2036 Expiration date for granted employee options

RSUs granted 181,280 RSUs Grant on June 22, 2026 to Cao Sean Wuxiong

RSU initial vest date September 3, 2026 One-fourth of RSUs vest on this date

Performance vesting price $8.00 ADS price 30-day average ADS price needed for option vesting

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

Key Terms

Restricted Share Units, American Depositary Shares, 30-trading-day weighted average price, Employee Share Option, +1 more

5 terms

American Depositary Shares financial

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

30-trading-day weighted average price financial

"the 30-trading-day weighted average price of the Issuer's ADS ... is at or above US$8.00."

contingent right financial

"Each restricted stock unit ("RSU") represents a contingent right to receive one American Depositary Shares"

FAQ

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

What equity awards did NovaBridge Biosciences (NBP) grant to Cao Sean Wuxiong?

NovaBridge Biosciences granted Cao Sean Wuxiong 181,290 employee share options and 181,280 restricted share units. Both awards relate to Ordinary Shares represented by American Depositary Shares, providing a mix of performance-based and time-based equity incentives.

What are the key terms of the new stock options reported for NBP?

The new options cover 181,290 underlying Ordinary Shares via ADSs, with an exercise price of $1.53 per ADS and expiration on June 22, 2036. Vesting occurs in eight quarterly installments after the ADS 30-day average price reaches $8.00.

What does each RSU granted by NovaBridge Biosciences (NBP) represent?

Each restricted stock unit represents a contingent right to receive one American Depositary Share. The filing notes the Ordinary Shares may be represented by ADSs, with 10 ADSs corresponding to 23 Ordinary Shares of NovaBridge Biosciences.

Is the equity grant to NovaBridge Biosciences (NBP) executive a market purchase or compensation?

The transactions are compensation-related grants, not market purchases. They are coded as “A” for grant, award, or other acquisition, with zero transaction price per share, reflecting employee stock options and restricted share units awarded to the executive.

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

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 06/24/2026 - 07:22 PM EDT

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^*

Cao Sean Wuxiong

(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
X	Officer (give title below)	Other (specify below)
	Chief Bus. Development Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/22/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Share Units	⁽¹⁾	06/22/2026		A		181,280⁽²⁾		⁽³⁾	⁽³⁾	Ordinary Shares⁽⁴⁾	181,280⁽²⁾	$0	181,280⁽²⁾	D
2025 Employee Share Option (right to buy)	$1.53⁽²⁾	06/22/2026		A		181,290⁽²⁾		⁽⁵⁾	06/22/2036	Ordinary Shares⁽⁴⁾	181,290⁽²⁾	$0	181,290⁽²⁾	D

Explanation of Responses:

1. Each restricted stock unit ("RSU") represents a contingent right to receive one American Depositary Shares ("ADS").

2. Number of underlying securities and exercise price expressed in terms of ADSs.

3. The RSUs shall vest over four years, with one-fourth vesting on September 3, 2026 and the balance vesting ratably over the subsequent 12 quarters on the third day of each third month.

4. The Ordinary Shares may be represented by ADSs. Each 10 ADSs represent 23 Ordinary Shares of the Issuer.

5. The option vests, if at all, in eight equal quarterly installments following the date on which the 30-trading-day weighted average price of the Issuer's ADS (based on trading days only) is at or above US$8.00.

	/s/ Xi-Yong (Sean) Fu as attorney-in-fact	06/24/2026
	** 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)

Source: View Original Filing on SEC EDGAR