STOCK TITAN

ArriVent COO exercises options for 40,693 shares

The reported option counts and exercise prices reflect the 15.21-for-1 reverse stock split effected January 23, 2024.

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Form Type
4

Rhea-AI Filing Summary

ArriVent BioPharma, Inc. Chief Operating Officer Robin LaChapelle exercised stock options covering 40,693 common shares on October 30, 2026, at exercise prices of $2.2815, $3.6504 and $6.2361 per share. The MAKS Yao Trust is listed with an indirect holding of 394,477 shares; LaChapelle is its trustee.

Insider LaChapelle Robin
Role Chief Operating Officer
Type Security Shares Price Value
Exercise Stock Option (right to buy) F2, F3 410 $0.00 $0.00
Exercise Stock Option (right to buy) F2, F4 4,550 $0.00 $0.00
Exercise Stock Option (right to buy) F2, F4 1,820 $0.00 $0.00
Exercise Stock Option (right to buy) F2, F5 16,265 $0.00 $0.00
Exercise Stock Option (right to buy) F2, F6 17,648 $0.00 $0.00
Exercise Common Stock 16,265 $3.6504 $59K
Exercise Common Stock 410 $2.2815 $935.42
Exercise Common Stock 4,550 $2.2815 $10K
Exercise Common Stock 1,820 $2.2815 $4K
Exercise Common Stock 17,648 $6.2361 $110K
Holding Common Stock F1 -- -- --
Holdings After Transaction: Stock Option (right to buy) — 41,423 contracts (Direct); Common Stock — 176,429 shares (Direct); Common Stock — 394,477 shares (Indirect, by Trust)
Footnotes (6)
  1. F1. The Reporting Person is the Trustee of The MAKS Yao Trust and may be deemed to have shared voting and investment power over the shares held by The MAKS Yao Trust. The Reporting Person does not have a pecuniary interest in and disclaims beneficial ownership of the shares held by The MAKS Yao Trust.
  2. F2. Reflects the 15.21-for-1 reverse stock split of the Issuer's common stock effected on January 23, 2024 in connection with the Issuer's initial public offering, pursuant to which (i) the number of shares of common stock underlying the option was divided by 15.21 and (ii) the exercise price of the option was multiplied by 15.21.
  3. F3. The shares underlying this option vested as to 25% on September 8, 2022, with the remainder vesting in 36 equal monthly installments thereafter, subject to the Reporting Person's continued service through the applicable vesting date.
  4. F4. The shares underlying this option vested as to 25% on February 1, 2023, with the remainder vesting in 36 equal monthly installments thereafter, subject to the Reporting Person's continued service through the applicable vesting date.
  5. F5. The shares underlying this option vested as to 25% on February 1, 2024, with the remainder vesting in 36 equal monthly installments thereafter, subject to the Reporting Person's continued service through the applicable vesting date.
  6. F6. The shares underlying this option vested as to 25% on August 22, 2024, with the remainder vesting in 36 equal monthly installments thereafter, subject to the Reporting Person's continued service through the applicable vesting date.
Shares covered by option exercises 40,693 shares October 30, 2026
Exercise price $2.2815 per share Reported option exercises on October 30, 2026
Exercise price $3.6504 per share Reported option exercise on October 30, 2026
Exercise price $6.2361 per share Reported option exercise on October 30, 2026
Trust shareholding 394,477 shares Indirect holding by The MAKS Yao Trust
reverse stock split financial
"15.21-for-1 reverse stock split of the Issuer's common stock"
A reverse stock split reduces a company's number of outstanding shares while raising the price per share proportionally, so the total value of each investor's holding is unchanged; a 1-for-10 split turns 100 shares worth $1 each into 10 shares worth $10 each. Companies often do this to regain compliance with an exchange's minimum price rule or to attract investors who avoid very low-priced stocks.
exercise price financial
"exercise price of the option was multiplied by 15.21"
The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.
vesting financial
"remainder vesting in 36 equal monthly installments thereafter"
Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.
pecuniary interest regulatory
"does not have a pecuniary interest in"
beneficial ownership regulatory
"disclaims beneficial ownership of the shares"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

FAQ

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

How many AVBP shares did Robin LaChapelle receive through option exercises?

The reported exercises covered 40,693 common shares on October 30, 2026, at exercise prices of $2.2815, $3.6504 and $6.2361 per share.

How are Robin LaChapelle's AVBP trust shares attributed?

The MAKS Yao Trust held 394,477 shares. Robin LaChapelle was its trustee and may be deemed to have shared voting and investment power, but has no pecuniary interest in and disclaims beneficial ownership of those shares.

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

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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*
LaChapelle Robin

(Last)(First)(Middle)
7325 BELLE MEADE BLVD

(Street)
MIAMI FLORIDA 33138

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
ArriVent BioPharma, Inc. [ AVBP ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Operating Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
10/30/2026
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 Stock10/30/2026M16,265A$3.6504152,001D
Common Stock10/30/2026M410A$2.2815152,411D
Common Stock10/30/2026M4,550A$2.2815156,961D
Common Stock10/30/2026M1,820A$2.2815158,781D
Common Stock10/30/2026M17,648A$6.2361176,429D
Common Stock394,477Iby Trust(1)
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
Stock Option (right to buy)$2.2815(2)10/30/2026M410 (3)09/07/2031Common Stock410$00D
Stock Option (right to buy)$2.2815(2)10/30/2026M4,550 (4)01/31/2032Common Stock4,550$01,820D
Stock Option (right to buy)$2.2815(2)10/30/2026M1,820 (4)01/31/2032Common Stock1,820$00D
Stock Option (right to buy)$3.6504(2)10/30/2026M16,265 (5)01/31/2033Common Stock16,265$02,600D
Stock Option (right to buy)$6.2361(2)10/30/2026M17,648 (6)08/21/2033Common Stock17,648$038,823D
Explanation of Responses:
1. The Reporting Person is the Trustee of The MAKS Yao Trust and may be deemed to have shared voting and investment power over the shares held by The MAKS Yao Trust. The Reporting Person does not have a pecuniary interest in and disclaims beneficial ownership of the shares held by The MAKS Yao Trust.
2. Reflects the 15.21-for-1 reverse stock split of the Issuer's common stock effected on January 23, 2024 in connection with the Issuer's initial public offering, pursuant to which (i) the number of shares of common stock underlying the option was divided by 15.21 and (ii) the exercise price of the option was multiplied by 15.21.
3. The shares underlying this option vested as to 25% on September 8, 2022, with the remainder vesting in 36 equal monthly installments thereafter, subject to the Reporting Person's continued service through the applicable vesting date.
4. The shares underlying this option vested as to 25% on February 1, 2023, with the remainder vesting in 36 equal monthly installments thereafter, subject to the Reporting Person's continued service through the applicable vesting date.
5. The shares underlying this option vested as to 25% on February 1, 2024, with the remainder vesting in 36 equal monthly installments thereafter, subject to the Reporting Person's continued service through the applicable vesting date.
6. The shares underlying this option vested as to 25% on August 22, 2024, with the remainder vesting in 36 equal monthly installments thereafter, subject to the Reporting Person's continued service through the applicable vesting date.
/s/ James Kastenmayer, Attorney-in-Fact for Robin LaChapelle11/02/2026
** 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)

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