IDEAYA CDO reports option over 297,200 shares

IDEAYA Biosciences, Inc. reported the initial equity holdings of Chief Development Officer Theodora Ross on a Form 3.

Rhea-AI Filing Summary

IDEAYA Biosciences, Inc. reported the initial equity holdings of Chief Development Officer Theodora Ross on a Form 3. She holds a stock option to purchase common stock with an exercise price of $31.90 per share, covering 297,200 underlying shares, expiring on February 26, 2036.

According to the vesting terms, 25% of the shares vest on the first anniversary of the February 23, 2026 vesting commencement date, and the remaining shares vest in equal monthly installments over the following three years until fully vested.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Ross Theodora

Role Chief Development Officer

Type	Security	Shares	Price	Value
holding	Stock Option (right to buy)	--	--	--

Holdings After Transaction: Stock Option (right to buy) — 297,200 contracts (Direct)

Footnotes (1)

1. F1. 25% of the shares subject to the option vest on the first anniversary measured from February 23, 2026 (the "Vesting Commencement Date"), and 1/48th of the total number of shares vest monthly thereafter, such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date.

Key Figures

Underlying option shares: 297,200 shares Exercise price: $31.90 per share Option expiration: February 26, 2036 +2 more

5 metrics

Underlying option shares 297,200 shares Underlying common stock for stock option holding

Exercise price $31.90 per share Stock option exercise price

Option expiration February 26, 2036 Expiration date of stock option

Initial vesting tranche 25% of shares Vesting on first anniversary of February 23, 2026

Ongoing vesting rate 1/48th monthly Monthly vesting after first anniversary until fully vested

Key Terms

Stock Option (right to buy), underlying security title, Vesting Commencement Date, fully vested and exercisable

4 terms

Stock Option (right to buy) financial

"security_title: Stock Option (right to buy)"

underlying security title financial

"underlying_security_title: Common Stock"

Vesting Commencement Date financial

"measured from February 23, 2026 (the "Vesting Commencement Date")"

The vesting commencement date is the starting point when an employee begins earning ownership rights to their promised benefits, such as stock options or retirement contributions. Think of it like the day a savings account is opened—only after this date do the benefits start to grow and become fully available over time. It matters to investors because it marks when the clock begins ticking toward full ownership, affecting the timing and value of these benefits.

fully vested and exercisable financial

"100% of the shares subject to the option will be fully vested and exercisable"

FAQ

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

What does the IDEAYA (IDYA) Form 3 filing report for Theodora Ross?

The Form 3 reports Theodora Ross’s initial beneficial ownership in IDEAYA. It shows she holds a stock option over 297,200 shares of common stock at a $31.90 exercise price, expiring February 26, 2036, with a four-year vesting schedule starting in 2026.

How many IDEAYA (IDYA) shares are covered by Theodora Ross’s stock option?

The stock option covers 297,200 underlying shares of IDEAYA common stock. This entire amount is subject to a four-year vesting schedule, with 25% vesting after the first year and the remainder vesting monthly over the following three years.

What is the exercise price and expiration date of the IDEAYA (IDYA) option reported?

The option has an exercise price of $31.90 per share and expires on February 26, 2036. These terms define the cost Ross must pay per share and the final date by which the option can be exercised, assuming shares have vested.

How does the vesting schedule work for Theodora Ross’s IDEAYA (IDYA) stock option?

The vesting begins from the February 23, 2026 vesting commencement date. Twenty-five percent of the shares vest on the first anniversary, and 1/48th of the total shares vest monthly thereafter, so the option is fully vested on the fourth anniversary.

Does the IDEAYA (IDYA) Form 3 show any stock purchases or sales by Theodora Ross?

The Form 3 does not show any purchases or sales; it only reports a stock option holding. It lists 297,200 underlying shares associated with the option as of the filing, reflecting her initial derivative equity position rather than recent trading activity.

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

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Accepted by SEC EDGAR 06/05/2026 - 02:06 PM EDT Learn about SEC filing dates

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Ross Theodora

(Last) (First) (Middle)

C/O IDEAYA BIOSCIENCES, INC.

5000 SHORELINE COURT, SUITE 300

(Street)

SOUTH SAN FRANCISCO CALIFORNIA 94080

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

3. Issuer Name and Ticker or Trading Symbol
IDEAYA Biosciences, Inc. [ IDYA ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Development Officer

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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (right to buy)	(1)	02/26/2036	Common Stock	297,200	$31.9	D

Explanation of Responses:

1. 25% of the shares subject to the option vest on the first anniversary measured from February 23, 2026 (the "Vesting Commencement Date"), and 1/48th of the total number of shares vest monthly thereafter, such that 100% of the shares subject to the option will be fully vested and exercisable on the fourth anniversary of the Vesting Commencement Date.

Remarks:

Exhibit 24.1 - Power of Attorney

	/s/ Douglas Snyder, as Attorney-in-Fact for Theodora Ross	06/05/2026
	** 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 5 (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 3: SEC 1473 (03-26)