Corbus Pharmaceuticals (CRBP) director Brent Pfeiffenberger files initial Form 3

Rhea-AI Filing Summary

Corbus Pharmaceuticals Holdings, Inc. director Brent Pfeiffenberger filed an initial ownership report on Form 3. The filing lists him as a director of the company but does not report any share transactions or holdings in this snapshot, serving as a baseline disclosure of his insider status.

Key Terms

Form 3, reporting person, ten percent owner

3 terms

Form 3 regulatory

"filed an initial 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.

reporting person regulatory

"the Form 3 for Brent Pfeiffenberger at Corbus Pharmaceuticals reports his status as a director"

ten percent owner financial

"he is identified as a director, with the ten percent owner flag set to zero"

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^*

Pfeiffenberger Brent

(Last) (First) (Middle)

C/O CORBUS PHARMACEUTICALS HOLDINGS, INC

500 RIVER RIDGE DRIVE

(Street)

NORWOOD MASSACHUSETTS 02062

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
05/13/2026

3. Issuer Name and Ticker or Trading Symbol
Corbus Pharmaceuticals Holdings, Inc. [ CRBP ]

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/Meghan Houghton, Attorney-in-Fact for Brent Pfeiffenberger	05/21/2026
	** 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 Corbus Pharmaceuticals (CRBP) Form 3 for Brent Pfeiffenberger show?

The Form 3 for Brent Pfeiffenberger at Corbus Pharmaceuticals reports his status as a director. It does not list any share transactions or derivative positions, serving mainly as an initial baseline disclosure of insider status with the SEC.

Does the CRBP Form 3 show Brent Pfeiffenberger buying or selling shares?

No, the Form 3 shows no reported share purchases or sales. Transaction counts and share amounts for buys, sells, exercises, gifts, and tax withholding are all zero, indicating this filing is purely an initial ownership report without trading activity.

Is Brent Pfeiffenberger a ten percent owner of Corbus Pharmaceuticals (CRBP)?

According to the Form 3, Brent Pfeiffenberger is not a ten percent owner of Corbus Pharmaceuticals. He is identified as a director, with the ten percent owner flag set to zero in the filing’s reporting person details.

Does the Corbus Pharmaceuticals Form 3 include any derivative securities for Brent Pfeiffenberger?

The Form 3 shows no derivative securities for Brent Pfeiffenberger. The derivativeSummary is empty, and derivativeTransactionCount is zero, indicating there are no reported options, warrants, or other derivative positions in this initial ownership filing.

What is the overall transaction summary in the CRBP Form 3 filing?

The transaction summary shows all counts and share amounts at zero, including buys, sells, exercises, gifts, and tax withholdings. This confirms the Form 3 is an administrative baseline filing without any insider trading activity reported for the period.