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Corbus Pharmaceuticals (CRBP) director sells 2,026 shares under 10b5-1 plan

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

Rhea-AI Filing Summary

Corbus Pharmaceuticals director Winston Kung sold 2,026 shares of common stock in an open-market transaction. The shares were sold at a weighted average price of $7.9137 per share, with individual sale prices ranging from $7.71 to $7.97.

The sale was carried out under a pre-arranged Rule 10b5-1 trading plan adopted on March 11, 2026. After this transaction, Kung holds 12,140 shares directly, which includes 3,800 unvested restricted stock units subject to the grant’s vesting schedule.

Positive

  • None.

Negative

  • None.
Insider Kung Winston
Role null
Sold 2,026 shs ($16K)
Type Security Shares Price Value
Sale Common Stock, par value $0.0001 per share 2,026 $7.9137 $16K
Holdings After Transaction: Common Stock, par value $0.0001 per share — 12,140 shares (Direct, null)
Footnotes (1)
  1. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 11, 2026. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.71 to $7.97. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. This amount includes 3,800 unvested RSUs subject to the grant's vesting schedule as previously reported.
Shares sold 2,026 shares Open-market sale on June 10, 2026
Weighted average sale price $7.9137 per share Common stock sale
Sale price range $7.71–$7.97 per share Multiple transactions within range
Shares held after sale 12,140 shares Direct ownership following transaction
Unvested RSUs included 3,800 RSUs Part of post-transaction holdings
10b5-1 plan adoption date March 11, 2026 Plan governing the reported sale
Rule 10b5-1 trading plan regulatory
"This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person"
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.
weighted average price financial
"The price reported in column 4 is a weighted average price."
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
restricted stock units financial
"This amount includes 3,800 unvested RSUs subject to the grant's vesting schedule"
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
open-market sale financial
"transaction_action: open-market sale"
An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.
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Learn about SEC filing dates
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).
X
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*
Kung Winston

(Last)(First)(Middle)
C/O CORBUS PHARMACEUTICALS HOLDINGS, INC
500 RIVER RIDGE DRIVE

(Street)
NORWOOD MASSACHUSETTS 02062

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Corbus Pharmaceuticals Holdings, Inc. [ CRBP ]
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)
06/10/2026
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
Common Stock, par value $0.0001 per share06/10/2026S(1)2,026D$7.9137(2)12,140(3)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
Explanation of Responses:
1. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 11, 2026.
2. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.71 to $7.97. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
3. This amount includes 3,800 unvested RSUs subject to the grant's vesting schedule as previously reported.
/s/ Meghan Houghton, attorney-in-fact for Winston Kung06/11/2026
** 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)

FAQ

What did Corbus Pharmaceuticals (CRBP) director Winston Kung report in this Form 4?

Director Winston Kung reported selling 2,026 shares of Corbus Pharmaceuticals common stock. The sale was an open-market transaction executed under a Rule 10b5-1 trading plan and left him with 12,140 shares, including 3,800 unvested RSUs.

How many Corbus Pharmaceuticals (CRBP) shares did Winston Kung sell and at what price?

Winston Kung sold 2,026 Corbus Pharmaceuticals common shares at a weighted average price of $7.9137. The individual trades occurred between $7.71 and $7.97 per share, as disclosed through a detailed price range footnote.

Was Winston Kung’s sale of Corbus Pharmaceuticals (CRBP) shares pre-planned?

Yes. The filing states the transaction was effected under a Rule 10b5-1 trading plan adopted on March 11, 2026. Such plans allow insiders to schedule trades in advance, providing structure and reducing the importance of trade timing.

How many Corbus Pharmaceuticals (CRBP) shares does Winston Kung hold after this transaction?

After the sale, Winston Kung directly holds 12,140 shares of Corbus Pharmaceuticals common stock. This figure includes 3,800 unvested restricted stock units that remain subject to the grant’s vesting schedule, as referenced in the footnotes.

What is the price range for Winston Kung’s Corbus Pharmaceuticals (CRBP) share sale?

The reported weighted average sale price was $7.9137 per share. According to the filing, the transactions were executed at prices ranging from $7.71 to $7.97 per share, with detailed breakdowns available upon request from the reporting person.

What type of security did Winston Kung trade in Corbus Pharmaceuticals (CRBP)?

Winston Kung traded Corbus Pharmaceuticals common stock with a par value of $0.0001 per share. The Form 4 notes this was a non-derivative security transaction, distinct from any options or other derivative instruments.