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Electra CEO converts 455K preferred into common

Electra Therapeutics’ CEO converted Series A preferred into 455,484 common shares, with 73,147 subject to future vesting.

(Neutral)
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Electra Therapeutics, Inc. (ETRA) reported that President & CEO and director Dong Quehuong (Kathy) converted all of her Series A Convertible Preferred Stock into Common Stock on September 21, 2026 in connection with the company’s initial public offering. The conversion produced 455,484 Common shares, which she now holds directly.

Of these shares, 73,147 are Restricted Shares that vest in 13 equal monthly installments beginning September 16, 2026. The Series A Convertible Preferred Stock converted automatically into Common Stock on a one-for-one basis and had no expiration date.

Positive

  • None.

Negative

  • None.
Insider Dong Quehuong (Kathy)
Role President & CEO
Type Security Shares Price Value
Conversion Series A Convertible Preferred Stock F2, F1 455,484 -- --
Conversion Common Stock F1, F2 455,484 -- --
Holdings After Transaction: Series A Convertible Preferred Stock — 0 contracts (Direct); Common Stock — 455,484 shares (Direct)
Footnotes (2)
  1. F1. 73,147 of the shares ("Restricted Shares") shall be subject to vesting as follows: 1/13th of the Restricted Shares shall vest monthly commencing from September 16, 2026.
  2. F2. Each share of Series A Convertible Preferred Stock (the "Preferred Stock") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date.
Preferred shares converted 455,484 shares Series A Convertible Preferred Stock converted on September 21, 2026
Common shares received 455,484 shares Common Stock acquired via conversion on September 21, 2026
Common shares held after transaction 455,484 shares Direct ownership position following the reported conversion
Restricted Shares 73,147 shares Portion of common shares subject to vesting
Restricted Shares vesting schedule 1/13th monthly Monthly vesting of 73,147 Restricted Shares starting September 16, 2026
Conversion ratio 1 share of Common Stock per 1 share of Preferred Stock Automatic conversion of Series A Convertible Preferred Stock upon IPO closing
Rule 10b5-1 plan status No Rule 10b5-1 plan reported Document-level indication for these transactions
Series A Convertible Preferred Stock financial
"security titled Series A Convertible Preferred Stock converted automatically"
Series A convertible preferred stock is a class of shares sold in an early funding round that gives investors a mix of protection and upside: it pays a priority claim over common shares if the company is sold or closes, but can be converted into ordinary shares to share in future growth. Think of it like a hybrid between a safer stake and a ticket to ownership; it matters to investors because it affects who controls the company, how future gains are split, and how much their investment is protected from downside.
Restricted Shares financial
"73,147 of the shares ("Restricted Shares") shall be subject to vesting"
Restricted shares are company stock that cannot be sold or transferred immediately because they are subject to legal or contractual limits, such as a required holding period or performance conditions. They matter to investors because these locked-up shares can affect a company’s available stock for trading, future dilution, and insider incentives—imagine a gift that can’t be cashed until certain conditions are met, which changes when and how much supply can suddenly enter the market.
initial public offering financial
"converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering"
An initial public offering (IPO) is when a private company first sells its shares to the public and becomes a stock-listed company. It matters because it allows the company to raise money from a wide range of investors, helping it grow, while giving early shareholders a way to sell some of their ownership.
automatic conversion financial
"Each share of Series A Convertible Preferred Stock converted automatically into 1 share"

FAQ

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

What did Electra Therapeutics (ETRA) report in this Form 4 for its CEO?

Electra Therapeutics reported that President & CEO Dong Quehuong (Kathy) converted all of her Series A Convertible Preferred Stock into 455,484 shares of Common Stock on September 21, 2026, related to the closing of the company’s initial public offering.

How many Electra Therapeutics (ETRA) common shares does the CEO hold after this transaction?

After the reported conversion, the CEO holds 455,484 shares of Common Stock directly. All previously held Series A Convertible Preferred Stock positions reported in this filing are shown as fully converted, with no remaining preferred shares.

What portion of the CEO’s Electra Therapeutics (ETRA) shares are restricted and how do they vest?

The filing states that 73,147 shares are “Restricted Shares.” These vest over time, with 1/13th of the Restricted Shares vesting monthly, commencing on September 16, 2026, until fully vested.

What was the conversion ratio of Electra Therapeutics’ Series A Convertible Preferred Stock?

Each share of Series A Convertible Preferred Stock converted automatically into 1 share of Common Stock upon the closing of Electra Therapeutics’ initial public offering, without any further consideration required, and the preferred stock had no expiration date.

Was this Electra Therapeutics (ETRA) Form 4 filed under a Rule 10b5-1 trading plan?

No. The document-level indication shows no Rule 10b5-1 trading plan for these transactions, and the footnotes do not describe any pre-arranged trading plan for this conversion event.

Did the CEO of Electra Therapeutics (ETRA) buy or sell shares on the market in this Form 4?

No market purchases or sales are reported. The filing shows a conversion of 455,484 preferred shares into an equal number of common shares, not an open-market trade, with the resulting 455,484 common shares held directly afterward.

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*
Dong Quehuong (Kathy)

(Last)(First)(Middle)
C/O ELECTRA THERAPEUTICS, INC.
230 E GRAND AVENUE, SUITE S-100

(Street)
SOUTH SAN FRANCISCO CALIFORNIA 94080

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
Electra Therapeutics, Inc. [ ETRA ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
XOfficer (give title below)Other (specify below)
President & CEO
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
09/21/2026
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 Stock09/21/2026C455,484(1)A(2)455,484D
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
Series A Convertible Preferred Stock(2)09/21/2026C455,484(1) (2) (2)Common Stock455,484(1)(2)0D
Explanation of Responses:
1. 73,147 of the shares ("Restricted Shares") shall be subject to vesting as follows: 1/13th of the Restricted Shares shall vest monthly commencing from September 16, 2026.
2. Each share of Series A Convertible Preferred Stock (the "Preferred Stock") converted automatically into 1 share of Common Stock upon the closing of the Issuer's initial public offering without payment of further consideration. Share numbers give effect to such conversion. The Preferred Stock had no expiration date.
/s/ Jamie Kitano, Attorney-in-Fact09/21/2026
** 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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