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Catalyst Pharmaceuticals (NASDAQ: CPRX) director’s equity converted to cash in Angelini merger

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Form Type
4

Rhea-AI Filing Summary

CATALYST PHARMACEUTICALS, INC. director Donald A. Denkhaus reported disposing of 498,773 shares of common stock at $31.50 per share on July 15, 2026, in a disposition to the issuer completed in connection with the acquisition of Catalyst by Angelini Pharma S.p.A. (the Merger).

On the same date, all reported restricted stock units and stock options, covering additional shares of common stock, were cancelled and converted into rights to receive cash payments based on the $31.50 per-share merger consideration, and his reported holdings in these securities fell to 0.

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Insider DENKHAUS DONALD A
Role Director
Type Security Shares Price Value
Disposition Options to purchase common stock F3, F5 33,500 $0.00 $0.00
Disposition Options to purchase common stock F3, F5 30,000 $0.00 $0.00
Disposition Options to purchase common stock F3, F5 20,000 $0.00 $0.00
Disposition Options to purchase common stock F3, F5 15,000 $0.00 $0.00
Disposition Options to purchase common stock F3, F6 29,524 $0.00 $0.00
Disposition Options to purchase common stock F3, F6 23,248 $0.00 $0.00
Disposition Options to purchase common stock F3, F6 18,115 $0.00 $0.00
Disposition Restricted Stock Units F2, F4, F6 1,414 $0.00 $0.00
Disposition Restricted Stock Units F2, F4, F6 1,894 $0.00 $0.00
Disposition Restricted Stock Units F2, F4, F6 5,468 $0.00 $0.00
Disposition Common Stock, par value $0.001 per share F1 498,773 $31.50 $15.71M
Holdings After Transaction: Options to purchase common stock — 0 shares (Direct); Restricted Stock Units — 0 shares (Direct); Common Stock, par value $0.001 per share — 0 shares (Direct)
Footnotes (6)
  1. F1. The reported securities were disposed of in connection with the consummation of the acquisition of the Issuer by Angelini Pharma S.p.A. (the "Merger")
  2. F2. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.
  3. F3. In connection with the consummation of the Merger, each reported stock option ("Option") was cancelled and converted into the right to receive a cash payment (without interest, and less applicable tax withholdings and other authorized deductions) equal to the product of (x) the excess of $31.50 per share over the per-share price of such Option, multiplied by (y) the total number of shares subject to such Option.
  4. F4. In connection with the consummation of the Merger, each reported restricted stock unit ("RSU") was cancelled and converted into the right to receive a cash payment (without interest, and less applicable tax withholdings and other authorized deductions) equal to the product of (x) the excess of $31.50 per share, multiplied by (y) the number of shares subject to such RSU.
  5. F5. Each Option was fully vested.
  6. F6. Each Option or RSU, as applicable, vested in full in connection with the consummation of the Merger.
Common shares disposed 498,773 shares Disposition to issuer on July 15, 2026 at $31.50 per share in connection with the Merger
Per-share merger consideration $31.50 per share Used to determine cash payments for common stock, RSUs and stock options
RSUs cancelled (2032-11-20 series) 5,468 units Restricted stock units expiring 2028-11-20 cancelled and converted into cash rights in the Merger
RSUs cancelled (2027-11-21 series) 1,894 units Restricted stock units expiring 2027-11-21 cancelled and converted into cash rights in the Merger
Options cancelled (2032-11-20 series) 18,115 options Options with a $22.77 exercise price, expiring 2032-11-20, cancelled for cash based on $31.50 per share
Dispose transactions reported 11 transactions All reported as Disposition to issuer on July 15, 2026, across common, RSUs and options
restricted stock unit financial
"Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock."
A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.
stock option financial
"each reported stock option ("Option") was cancelled and converted into the right to receive a cash payment"
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 the reported transactions"
Merger financial
"in connection with the consummation of the acquisition of the Issuer by Angelini Pharma S.p.A. (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.

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

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FAQ

What did Donald A. Denkhaus report in the Catalyst Pharmaceuticals (CPRX) Form 4?

Donald A. Denkhaus reported disposing of 498,773 shares of Catalyst common stock at $31.50 per share on July 15, 2026. The disposition was to the issuer in connection with the acquisition of Catalyst by Angelini Pharma S.p.A. (the Merger).

How many Catalyst Pharmaceuticals (CPRX) securities does Donald A. Denkhaus report holding after these transactions?

Following the reported transactions, Donald A. Denkhaus shows 0 shares of common stock and 0 reported restricted stock units or stock options in this report. Each transaction row lists a post-transaction balance of zero for the securities covered.

How were restricted stock units treated for Donald A. Denkhaus in the Catalyst (CPRX) Merger?

Each reported restricted stock unit was cancelled and converted into a right to receive a cash payment equal to $31.50 per share multiplied by the RSU share count, less applicable tax withholdings and other authorized deductions, upon consummation of the Merger.

How were stock options treated for Donald A. Denkhaus in the Catalyst Pharmaceuticals (CPRX) Merger?

Each reported stock option was cancelled and converted into a right to receive cash equal to the excess of $31.50 per share over the option’s exercise price, multiplied by the option’s shares, less taxes and deductions. Footnotes state each option was fully vested and vested in full in connection with the Merger.

What per-share value was used to calculate cash payments in the Catalyst (CPRX) Merger for Donald A. Denkhaus?

A per-share amount of $31.50 was used. Common stock dispositions occurred at $31.50 per share, and this same figure was the basis for calculating cash payable on both restricted stock units and stock options in connection with the Merger.

Were the reported Catalyst (CPRX) Form 4 transactions made under a Rule 10b5-1 trading plan?

The Rule 10b5-1 checkbox for these transactions was not marked as affirming that they were made under a Rule 10b5-1 or similar trading arrangement. The footnotes instead link the activity to the consummation of the Merger with Angelini Pharma S.p.A.
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*
DENKHAUS DONALD A

(Last)(First)(Middle)
355 ALHAMBRA CIRCLE
SUITE 801

(Street)
CORAL GABLES FLORIDA 33134

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
CATALYST PHARMACEUTICALS, INC. [ CPRX ]
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)
07/15/2026
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 $0.001 per share07/15/2026D(1)498,773D$31.50D
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
Options to purchase common stock$4.6407/15/2026D(3)33,500 (5)12/02/2026Common Stock33,500$00D
Options to purchase common stock$3.4207/15/2026D(3)30,000 (5)12/30/2027Common Stock30,000$00D
Options to purchase common stock$7.0707/15/2026D(3)20,000 (5)12/28/2028Common Stock20,000$00D
Options to purchase common stock$18.5907/15/2026D(3)15,000 (5)12/27/2029Common Stock15,000$00D
Options to purchase common stock$14.1507/15/2026D(3)29,524 (6)12/08/2030Common Stock29,524$00D
Options to purchase common stock$21.1207/15/2026D(3)23,248 (6)11/21/2031Common Stock23,248$00D
Options to purchase common stock$22.7707/15/2026D(3)18,115 (6)11/20/2032Common Stock18,115$00D
Restricted Stock Units(2)07/15/2026D(4)1,414 (6)12/08/2026Common Stock1,414$00D
Restricted Stock Units(2)07/15/2026D(4)1,894 (6)11/21/2027Common Stock1,894$00D
Restricted Stock Units(2)07/15/2026D(4)5,468 (6)11/20/2028Common Stock5,468$00D
Explanation of Responses:
1. The reported securities were disposed of in connection with the consummation of the acquisition of the Issuer by Angelini Pharma S.p.A. (the "Merger")
2. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.
3. In connection with the consummation of the Merger, each reported stock option ("Option") was cancelled and converted into the right to receive a cash payment (without interest, and less applicable tax withholdings and other authorized deductions) equal to the product of (x) the excess of $31.50 per share over the per-share price of such Option, multiplied by (y) the total number of shares subject to such Option.
4. In connection with the consummation of the Merger, each reported restricted stock unit ("RSU") was cancelled and converted into the right to receive a cash payment (without interest, and less applicable tax withholdings and other authorized deductions) equal to the product of (x) the excess of $31.50 per share, multiplied by (y) the number of shares subject to such RSU.
5. Each Option was fully vested.
6. Each Option or RSU, as applicable, vested in full in connection with the consummation of the Merger.
/s/ Donald A. Denkhaus07/17/2026
** 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)