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  4. [Form 4] NovaBridge Biosciences Insider Trading Activity

NovaBridge (NBP) director lifts stake to 17,218 total shares

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

NovaBridge Biosciences (NBP) director Lenz Robert A. reported an exercise of equity awards and a related share acquisition. On August 22, 2026, he exercised 7,486 restricted share units (RSUs), each convertible into one American Depositary Share (ADS), which together correspond to 17,218 Ordinary Shares. These exercises reduced his RSU balance but increased his direct non-derivative holdings to 17,218 Ordinary Shares, while he continues to hold 14,974 RSUs that remain outstanding and subject to vesting from an original grant of 22,460 RSUs awarded on August 22, 2025.

Positive

  • None.

Negative

  • None.
Insider Lenz Robert A.
Role Director
Type Security Shares Price Value
Exercise Restricted Share Units F3, F4, F5 7,486 $0.00 $0.00
Exercise Ordinary Shares F1, F2, F3 17,218 -- --
Holdings After Transaction: Restricted Share Units — 14,974 shares (Direct); Ordinary Shares — 17,218 shares (Direct)
Footnotes (5)
  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 7,486 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 August 22, 2025, the Reporting Person was granted 22,460 restricted share units ("RSUs"). The RSUs vested or shall vest over three years in three equal annual installments on August 22, 2026, 2027 and 2028.
RSUs exercised 7,486 restricted share units Exercised by Lenz Robert A. on August 22, 2026
Ordinary Shares acquired 17,218 Ordinary Shares Resulting from exercise of 7,486 RSUs represented by 7,486 ADSs
RSUs remaining after transaction 14,974 restricted share units Total RSUs directly held following the August 22, 2026 transactions
Original RSU grant 22,460 restricted share units Granted to Lenz Robert A. on August 22, 2025
ADS to Ordinary Share ratio 10 ADSs represent 23 Ordinary Shares Ratio stated for NovaBridge Biosciences securities
ADSs from RSU exercise 7,486 ADSs Reported securities received upon exercise of RSUs
Restricted Share Units financial
"The Ordinary Shares may be represented by American Depositary Shares ("ADS"). Each 10 ADSs represent 23 Ordinary Shares"
Restricted share units (RSUs) are a promise from a company to give an employee or service provider actual shares or cash equal to the shares after certain conditions are met, typically staying with the company for a set time or hitting performance targets. Think of them like a time-locked gift card that becomes usable only after you’ve earned it. For investors, RSUs matter because they align employee incentives with company performance and can increase the number of shares outstanding over time, diluting existing ownership and affecting earnings per share.
American Depositary Shares financial
"The Ordinary Shares may be represented by American Depositary Shares ("ADS"). Each 10 ADSs represent"
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.
restricted stock unit ("RSU") financial
"Each restricted stock unit ("RSU") represents a contingent right to receive one ADS."
contingent right financial
"Each restricted stock unit ("RSU") represents a contingent right to receive one ADS."

FAQ

What insider transaction did NovaBridge Biosciences (NBP) report for Lenz Robert A.?
Lenz Robert A., a director of NovaBridge Biosciences (NBP), reported exercising 7,486 restricted share units on August 22, 2026, receiving ADSs equivalent to 17,218 Ordinary Shares, and increasing his direct non-derivative holdings to that same 17,218 Ordinary Shares figure.

How many NovaBridge Biosciences (NBP) RSUs did Lenz Robert A. exercise and when?
He exercised 7,486 restricted share units (RSUs) on August 22, 2026. Each RSU represents a contingent right to receive one ADS, and the reported securities from this exercise are represented by 7,486 ADSs tied to NovaBridge Biosciences.

What is Lenz Robert A.’s NovaBridge Biosciences (NBP) shareholding after the reported Form 4 transactions?
After the reported transactions, Lenz Robert A. directly holds 17,218 Ordinary Shares of NovaBridge Biosciences, represented by 7,486 ADSs. He also continues to hold 14,974 RSUs that remain outstanding from his prior equity grant.

What RSU grant underlies the current NovaBridge Biosciences (NBP) Form 4 for Lenz Robert A.?
The transactions relate to a grant of 22,460 restricted share units (RSUs) awarded on August 22, 2025. Those RSUs vest in three equal annual installments on August 22, 2026, 2027, and 2028, with a portion now exercised into ADSs.

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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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*
Lenz Robert A.
(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)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/22/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Ordinary Shares(1)08/22/2026M17,218(2)A(3)17,218(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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Share Units(3)08/22/2026M7,486(4) (5) (5)Ordinary Shares7,486$014,974(4)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 7,486 ADSs.
3. Each restricted stock unit ("RSU") represents a contingent right to receive one ADS.
4. Reported securities represent ADSs.
5. On August 22, 2025, the Reporting Person was granted 22,460 restricted share units ("RSUs"). The RSUs vested or shall vest over three years in three equal annual installments on August 22, 2026, 2027 and 2028.
/s/Kyler Lei, Attorney-in-Fact08/25/2026
** Signature of Reporting PersonDate
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