STOCK TITAN

BioMarin-Amicus deal pays CDO Castelli (FOLD) $14.50 per share

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

Rhea-AI Filing Summary

AMICUS THERAPEUTICS, INC. Chief Development Officer Jeff Castelli reported disposing of his equity in connection with the acquisition of Amicus by BioMarin Pharmaceutical Inc. In the transaction, he disposed of 427,089 shares of Common Stock at $14.50 per share, including 318,417 shares of Common Stock and 108,672 restricted stock units that vested in full at closing.

Several fully vested stock option awards were also cancelled and converted into the right to receive cash equal to $14.50 per share minus each option’s exercise price, multiplied by the option share count. Following these dispositions, the filing shows no remaining Common Stock or stock options held directly by Castelli.

Positive

  • None.

Negative

  • None.
Insider Castelli Jeff
Role Chief Development Officer
Type Security Shares Price Value
Disposition Stock Options (right to buy) 82,644 $0.00 --
Disposition Stock Options (right to buy) 107,575 $0.00 --
Disposition Stock Options (right to buy) 108,266 $0.00 --
Disposition Stock Options (right to buy) 125,462 $0.00 --
Disposition Stock Options (right to buy) 99,073 $0.00 --
Disposition Stock Options (right to buy) 150,517 $0.00 --
Disposition Common Stock 427,089 $14.50 $6.19M
Holdings After Transaction: Stock Options (right to buy) — 0 shares (Direct, null); Common Stock — 0 shares (Direct, null)
Footnotes (1)
  1. The reported securities were disposed of in connection with consummation of the acquisition of the Issuer by BioMarin Pharmaceutical Inc. (the "Merger"), which included 318,417 shares of Common Stock and 108,672 restricted stock units (which vested in full in connection with consummation of the Merger). In connection with consummation of the Merger, each reported stock option ("Option") was cancelled and converted into the right to receive a cash payment equal to (a) the excess of (i) $14.50 per share over (ii) the exercise price payable per share, multiplied by (b) the total number of shares subject to such Option. Each Option was fully vested. Each Option vested in full in connection with consummation of the Merger.
Common Stock disposed 427,089 shares Disposed to issuer at $14.50 per share in merger
Merger share price $14.50 per share Price used for Common Stock and option cash-out
Restricted stock units vested 108,672 units Vested in full upon consummation of the merger
Option block 1 shares 150,517 shares Stock options at $9.41 exercise price, cancelled for cash
Option block 2 shares 99,073 shares Stock options at $14.24 exercise price, cancelled for cash
Option block 3 shares 125,462 shares Stock options at $11.93 exercise price, cancelled for cash
Post-transaction holdings 0 shares / 0 options Total Common Stock and options after merger-related dispositions
restricted stock units financial
"which included 318,417 shares of Common Stock and 108,672 restricted stock units"
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.
stock option financial
"In connection with consummation of the Merger, each reported stock option ("Option") was cancelled"
A stock option is a contract that gives you the right to buy or sell a company's stock at a specific price within a certain time frame. People use them to potentially make money if the stock's price moves favorably or to protect against losses. It's like holding a coupon that can be used to buy or sell stock at a set price later on.
disposition to issuer financial
"transaction_code_description: "Disposition to issuer" for each reported transaction"
Merger financial
"disposed of in connection with consummation of the acquisition of the Issuer by BioMarin Pharmaceutical Inc. (the "Merger")"
A merger is when two companies combine into a single business, with ownership and control reorganized so they operate as one entity. For investors it matters because mergers can change the value and risk of holdings—shares may be exchanged, diluted, or rise if the combined company saves costs or gains market power, and the deal often depends on regulatory approval and successful integration like two households joining resources and routines.
exercise price financial
"equal to (a) the excess of (i) $14.50 per share over (ii) the exercise price payable per share"
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.
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
X
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*
Castelli Jeff

(Last)(First)(Middle)
47 HULFISH STREET

(Street)
PRINCETON NEW JERSEY 08542

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
AMICUS THERAPEUTICS, INC. [ FOLD ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Development Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
04/27/2026
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 Stock04/27/2026D427,089(1)D$14.50D
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 Options (right to buy)$10.0404/27/2026D(2)82,644 (3)01/02/2029Common Stock82,644(2)0D
Stock Options (right to buy)$9.5504/27/2026D(2)107,575 (3)01/02/2030Common Stock107,575(2)0D
Stock Options (right to buy)$12.1104/27/2026D(2)108,266 (3)01/03/2032Common Stock108,266(2)0D
Stock Options (right to buy)$11.9304/27/2026D(2)125,462 (4)01/03/2033Common Stock125,462(2)0D
Stock Options (right to buy)$14.2404/27/2026D(2)99,073 (4)01/02/2034Common Stock99,073(2)0D
Stock Options (right to buy)$9.4104/27/2026D(2)150,517 (4)01/03/2035Common Stock150,517(2)0D
Explanation of Responses:
1. The reported securities were disposed of in connection with consummation of the acquisition of the Issuer by BioMarin Pharmaceutical Inc. (the "Merger"), which included 318,417 shares of Common Stock and 108,672 restricted stock units (which vested in full in connection with consummation of the Merger).
2. In connection with consummation of the Merger, each reported stock option ("Option") was cancelled and converted into the right to receive a cash payment equal to (a) the excess of (i) $14.50 per share over (ii) the exercise price payable per share, multiplied by (b) the total number of shares subject to such Option.
3. Each Option was fully vested.
4. Each Option vested in full in connection with consummation of the Merger.
/s/ Christian Formica, Attorney-in-Fact04/27/2026
** 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 Jeff Castelli report in this Amicus (FOLD) Form 4 filing?

Jeff Castelli reported disposing of his Amicus equity in connection with the BioMarin acquisition. He surrendered 427,089 Common Stock shares and multiple stock option awards, all converted into cash rights based on a $14.50 per share merger price.

At what price were Jeff Castelli’s Amicus (FOLD) shares valued in the merger?

His reported Common Stock was valued at $14.50 per share in the merger. This price also determined cash payments for cancelled options, using $14.50 minus each option’s exercise price, multiplied by the number of option shares.

How many Amicus (FOLD) shares did Jeff Castelli dispose of in this transaction?

He disposed of 427,089 shares of Amicus Common Stock. Footnotes state this total includes 318,417 Common Stock shares and 108,672 restricted stock units that vested fully upon consummation of the merger with BioMarin Pharmaceutical Inc.

What happened to Jeff Castelli’s Amicus (FOLD) stock options in the BioMarin merger?

Each reported stock option was cancelled at closing and converted into a cash right. The payment equals $14.50 per share minus the option’s exercise price, multiplied by the total number of shares subject to that option award.

Were Jeff Castelli’s Amicus (FOLD) stock options vested before the merger?

Yes. Footnotes state each option was fully vested. Some options were already fully vested, and others vested in full in connection with consummation of the merger, before being cancelled and converted into cash-based rights.

Does Jeff Castelli hold any Amicus (FOLD) shares or options after this Form 4?

The Form 4 shows zero shares of Common Stock and zero stock option holdings following the reported transactions. This reflects that his Amicus equity and options were fully disposed of and converted into merger-related cash rights.