Key facts
- This page summarizes Lenaic Nathanael Teyssedou's Form 4 filing for Addex Therapeutics Ltd. (ADXN).
- 16 reported transactions and 16 derivative rows are listed below.
- Accepted by SEC: 04 Sep 2026, 16:11.
Lenaic Nathanael Teyssedou - 02 Sep 2026 Form 4 Insider Report for Addex Therapeutics Ltd. (ADXN)
- Reporting relationship
- PRINCIPAL ACCOUNTING OFFICER
- Issuer ticker
- ADXN
- Reported as of
- 02 Sep 2026
- Net transaction value
- $0
- SEC form
- 4
- Accepted by SEC
- 04 Sep 2026, 16:11:06 UTC
- Prior SEC filing
- 25 Mar 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/ Lenaic Nathanael Teyssedou
Source evidence
Original filing metadata and source links for verification.
4 source fields
Reporting owner
1 detail
Key filing fact
Lenaic Nathanael Teyssedou filed Form 4 for Addex Therapeutics Ltd. (ADXN) on 04 Sep 2026.
Change
- Previous filing in this sequence was filed on 25 Mar 2026.
- Current net transaction value: $0.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0002123881
Primary reporting owner
Teyssedou Lenaic Nathanael
- Relationship
- PRINCIPAL ACCOUNTING OFFICER
- Address
- CHEMIN DES MINES 9, GENEVA, SWITZERLAND
- Signature
- /s/ Lenaic Nathanael Teyssedou
- Signature date
- 04 Sep 2026
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Disposed to Issuer
- Transaction value
- Shares
- -37,770
- Change %
- -6.3%
- Price
- $0.000000*
- Shares after
- 565,138
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 37,770
- Exercise price
- $0.1600
- Footnotes
- F1, F2
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Award
- Transaction value
- Shares
- +37,770
- Change %
- +6.7%
- Price
- $0.000000*
- Shares after
- 602,908
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 37,770
- Exercise price
- $0.0320
- Footnotes
- F1, F2
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Disposed to Issuer
- Transaction value
- Shares
- -59,530
- Change %
- -9.9%
- Price
- $0.000000*
- Shares after
- 543,378
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 59,530
- Exercise price
- $0.1600
- Footnotes
- F1, F2
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Award
- Transaction value
- Shares
- +59,530
- Change %
- +11%
- Price
- $0.000000*
- Shares after
- 602,908
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 59,530
- Exercise price
- $0.0320
- Footnotes
- F1, F2
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Disposed to Issuer
- Transaction value
- Shares
- -10,000
- Change %
- -1.7%
- Price
- $0.000000*
- Shares after
- 592,908
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 10,000
- Exercise price
- $0.1600
- Footnotes
- F1, F2
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Award
- Transaction value
- Shares
- +10,000
- Change %
- +1.7%
- Price
- $0.000000*
- Shares after
- 602,908
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 10,000
- Exercise price
- $0.0320
- Footnotes
- F1, F2
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Disposed to Issuer
- Transaction value
- Shares
- -30,000
- Change %
- -5%
- Price
- $0.000000*
- Shares after
- 572,908
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 30,000
- Exercise price
- $0.1600
- Footnotes
- F1, F2
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Award
- Transaction value
- Shares
- +30,000
- Change %
- +5.2%
- Price
- $0.000000*
- Shares after
- 602,908
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 30,000
- Exercise price
- $0.0320
- Footnotes
- F1, F2
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Disposed to Issuer
- Transaction value
- Shares
- -65,620
- Change %
- -11%
- Price
- $0.000000*
- Shares after
- 537,288
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 65,620
- Exercise price
- $0.1600
- Footnotes
- F1, F2
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Award
- Transaction value
- Shares
- +65,620
- Change %
- +12%
- Price
- $0.000000*
- Shares after
- 602,908
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 65,620
- Exercise price
- $0.0320
- Footnotes
- F1, F2
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Disposed to Issuer
- Transaction value
- Shares
- -90,529
- Change %
- -15%
- Price
- $0.000000*
- Shares after
- 512,379
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 90,529
- Exercise price
- $0.1600
- Footnotes
- F1, F2
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Award
- Transaction value
- Shares
- +90,529
- Change %
- +18%
- Price
- $0.000000*
- Shares after
- 602,908
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 90,529
- Exercise price
- $0.0320
- Footnotes
- F1, F2
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Disposed to Issuer
- Transaction value
- Shares
- -208,974
- Change %
- -35%
- Price
- $0.000000*
- Shares after
- 393,934
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 208,974
- Exercise price
- $0.0530
- Footnotes
- F1, F2
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Award
- Transaction value
- Shares
- +208,974
- Change %
- +53%
- Price
- $0.000000*
- Shares after
- 602,908
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 208,974
- Exercise price
- $0.0320
- Footnotes
- F1, F2
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Disposed to Issuer
- Transaction value
- Shares
- -100,485
- Change %
- -17%
- Price
- $0.000000*
- Shares after
- 502,423
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 100,485
- Exercise price
- $0.0620
- Footnotes
- F1, F2
ADXN
transaction
Derivative
Stock-option (Right to Buy)
Award
- Transaction value
- Shares
- +100,485
- Change %
- +20%
- Price
- $0.000000*
- Shares after
- 602,908
- Date
- 02 Sep 2026
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 100,485
- Exercise price
- $0.0320
- Footnotes
- F1, F2
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 2 footnotes
Footnote F1
On September 2, 2026, following the implementation of the Remuneration Committee's decision, the exercise price of the options were repriced to $0.032. All of the other terms of the options remain unchanged. Such transactions were exempt pursuant to Rule 16b-6(d) and Rule 16b-3 of the exchange act as applicable.
Footnote F2
The exercise price is reported in U.S. dollars and reflects the conversion from CHF to USD at an exchange rate of $1.2296 per CHF 1.00 as of September 2, 2026.