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  4. [Form 4] IONIS PHARMACEUTICALS INC Insider Trading Activity

IONS director discloses 10b5-1 stock sales; 64,035 shares remain

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

Rhea-AI Filing Summary

Ionis Pharmaceuticals (IONS): Director stock transactions disclosed. Director Joseph H. Wender reported open-market sales executed under a Rule 10b5-1 trading plan adopted on December 26, 2024. On 10/30/2025, the trust sold 2,484 shares at a weighted average price of $72.19, 8,341 shares at $73.16, and 5,975 shares at $73.85. On 10/31/2025, it sold 11,200 shares at a weighted average price of $75.1586.

Following these transactions, 64,035 shares were beneficially owned indirectly by a trust. The filing notes the reported prices are weighted averages from multiple trades within disclosed ranges, and detailed trade breakdowns are available upon request.

Positive

  • None.

Negative

  • None.
Insider WENDER JOSEPH H
Role Director
Sold 28,000 shs ($2.07M)
Type Security Shares Price Value
Sale Common Stock 11,200 $75.1586 $842K
Sale Common Stock 2,484 $72.19 $179K
Sale Common Stock 8,341 $73.16 $610K
Sale Common Stock 5,975 $73.85 $441K
Holdings After Transaction: Common Stock — 64,035 shares (Indirect, by Trust)
Footnotes (1)
  1. Shares sold pursuant to a Rule 10b5-1 Trading Plan adopted by the reporting person on December 26, 2024. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $71.62 to $72.62 inclusive. The reporting person undertakes to provide to Ionis Pharmaceuticals, Inc. any security holder of Ionis Pharmaceuticals, Inc. 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 ranges set forth in footnote (2) on this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $72.63 to $73.63 inclusive. The reporting person undertakes to provide to Ionis Pharmaceuticals, Inc. any security holder of Ionis Pharmaceuticals, Inc. 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 ranges set forth in footnote (3) on this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $73.6750 to $74.28 inclusive. The reporting person undertakes to provide to Ionis Pharmaceuticals, Inc. any security holder of Ionis Pharmaceuticals, Inc. 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 ranges set forth in footnote (4) on this Form 4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.00 to $75.41 inclusive. The reporting person undertakes to provide to Ionis Pharmaceuticals, Inc. any security holder of Ionis Pharmaceuticals, Inc. 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 ranges set forth in footnote (5) on this Form 4.
Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4 UNITED 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*
WENDER JOSEPH H
(Last) (First) (Middle)
2855 GAZELLE COURT
(Street)
CARLSBAD CA 92010
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
IONIS PHARMACEUTICALS INC [ IONS ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director 10% Owner
Officer (give title below) Other (specify below)
3. Date of Earliest Transaction (Month/Day/Year)
10/30/2025
4. If Amendment, Date of Original Filed (Month/Day/Year)
 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 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)
Code V Amount (A) or (D) Price
Common Stock 10/30/2025 S 2,484(1) D $72.19(2) 89,551 I by Trust
Common Stock 10/30/2025 S 8,341(1) D $73.16(3) 81,210 I by Trust
Common Stock 10/30/2025 S 5,975(1) D $73.85(4) 75,235 I by Trust
Common Stock 10/31/2025 S 11,200(1) D $75.1586(5) 64,035 I by Trust
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)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Explanation of Responses:
1. Shares sold pursuant to a Rule 10b5-1 Trading Plan adopted by the reporting person on December 26, 2024.
2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $71.62 to $72.62 inclusive. The reporting person undertakes to provide to Ionis Pharmaceuticals, Inc. any security holder of Ionis Pharmaceuticals, Inc. 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 ranges set forth in footnote (2) on this Form 4.
3. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $72.63 to $73.63 inclusive. The reporting person undertakes to provide to Ionis Pharmaceuticals, Inc. any security holder of Ionis Pharmaceuticals, Inc. 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 ranges set forth in footnote (3) on this Form 4.
4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $73.6750 to $74.28 inclusive. The reporting person undertakes to provide to Ionis Pharmaceuticals, Inc. any security holder of Ionis Pharmaceuticals, Inc. 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 ranges set forth in footnote (4) on this Form 4.
5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.00 to $75.41 inclusive. The reporting person undertakes to provide to Ionis Pharmaceuticals, Inc. any security holder of Ionis Pharmaceuticals, Inc. 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 ranges set forth in footnote (5) on this Form 4.
By: Patrick R. O'Neil, attorney-in-fact For: Joseph H. Wender 11/03/2025
** 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 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.

Source: View Original Filing on SEC EDGAR

FAQ

What did Ionis (IONS) disclose in this Form 4?

A director reported open-market sales of common stock executed under a Rule 10b5-1 trading plan.

When were the Ionis (IONS) share sales executed?

On 10/30/2025 and 10/31/2025.

How many Ionis (IONS) shares were sold and at what prices?

2,484 at $72.19, 8,341 at $73.16, 5,975 at $73.85 on 10/30/2025; 11,200 at $75.1586 on 10/31/2025.

What is the director’s remaining Ionis (IONS) ownership after the sales?

64,035 shares beneficially owned indirectly by a trust.

Were these Ionis (IONS) sales under a 10b5-1 plan?

Yes. The plan was adopted on December 26, 2024.

How are the reported prices calculated?

They are weighted average prices from multiple transactions within stated ranges; detailed breakdowns are available upon request.