STOCK TITAN

RTB Digital (RTB) COO discloses initial common stock and long-dated options

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
3

Rhea-AI Filing Summary

RTB Digital, Inc. Chief Operating Officer Sornsin William Carrier Jr filed an initial ownership report showing his equity position. He directly holds 127,314 shares of common stock. He also holds stock options covering 84,346 shares at an exercise price of $1.89 per share expiring on August 12, 2035, and options covering 116,705 shares at $0.94 per share expiring on May 15, 2034. These options were originally granted by RTB Digital, Inc. in 2024 and 2025 and were assumed in connection with the business combination, continuing to vest under their original schedules.

Positive

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Negative

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Insider Sornsin William Carrier Jr
Role Chief Operating Officer
Type Security Shares Price Value
holding Stock Options -- -- --
holding Stock Options -- -- --
holding Common stock, par value $0.001 -- -- --
Holdings After Transaction: Stock Options — 116,705 shares (Direct, null); Common stock, par value $0.001 — 127,314 shares (Direct, null)
Footnotes (1)
  1. Represents a stock option originally granted by RTB Digital, Inc. on May 15, 2024, which was assumed by the Issuer in connection with the business combination between the Issuer and RTB Digital, Inc. Following the transaction, the option became exercisable for shares of the Issuer's common stock on substantially the same terms as in effect immediately prior to the transaction, with appropriate adjustments to the number of underlying shares and exercise price, and continues to vest in accordance with its original vesting schedule, subject to the Reporting Person's continued service with the Issuer. Represents a stock option originally granted by RTB Digital, Inc. on August 12, 2025, which was assumed by the Issuer in connection with the business combination between the Issuer and RTB Digital, Inc. Following the transaction, the option became exercisable for shares of the Issuer's common stock on substantially the same terms as in effect immediately prior to the transaction, with appropriate adjustments to the number of underlying shares and exercise price, and continues to vest in accordance with its original vesting schedule, subject to the Reporting Person's continued service with the Issuer.
Common shares held 127,314 shares Direct ownership reported on Form 3
Option strike price 1 $1.89/share Stock options exercisable into 84,346 common shares
Option shares 1 84,346 shares Underlying common stock for $1.89 options expiring August 12, 2035
Option strike price 2 $0.94/share Stock options exercisable into 116,705 common shares
Option shares 2 116,705 shares Underlying common stock for $0.94 options expiring May 15, 2034
Form 3 regulatory
"Chief Operating Officer Sornsin William Carrier Jr filed an initial ownership report"
Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.
stock option financial
"Represents a stock option originally granted by RTB Digital, Inc. on May 15, 2024"
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.
business combination financial
"assumed by the Issuer in connection with the business combination between the Issuer and RTB Digital, Inc."
A business combination happens when two or more companies join together to operate as one, like two friends merging their teams into a single group. This is important because it can change how companies grow, compete, and make money, often making them bigger and more powerful in the market.
exercise price financial
"appropriate adjustments to the number of underlying shares and exercise price"
The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.
vesting schedule financial
"continues to vest in accordance with its original vesting schedule"
A vesting schedule is a timeline that determines when someone gains full ownership of certain benefits, such as company stock or retirement contributions. Think of it like earning the right to own a gift gradually over time, rather than receiving it all at once. It matters to investors because it affects when they can fully access or sell these benefits, influencing their financial planning and decision-making.
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SEC Form 3
FORM 3UNITED 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*
Sornsin William Carrier Jr

(Last)(First)(Middle)
3111 CAMINO DEL RIO NORTH, SUITE 400

(Street)
SAN DIEGO CALIFORNIA 92108

(City)(State)(Zip)

UNITED STATES

(Country)
2. Date of Event Requiring Statement (Month/Day/Year)
05/21/2026
3. Issuer Name and Ticker or Trading Symbol
RTB Digital, Inc. [ RTB ]
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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Operating Officer
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
Common stock, par value $0.001127,314D
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 ExercisableExpiration DateTitleAmount or Number of Shares
Stock Options(1)05/15/202705/15/2034Common Stock, par value $0.001116,705$0.94D
Stock Options(2)08/12/202808/12/2035Common Stock, par value $0.00184,346$1.89D
Explanation of Responses:
1. Represents a stock option originally granted by RTB Digital, Inc. on May 15, 2024, which was assumed by the Issuer in connection with the business combination between the Issuer and RTB Digital, Inc. Following the transaction, the option became exercisable for shares of the Issuer's common stock on substantially the same terms as in effect immediately prior to the transaction, with appropriate adjustments to the number of underlying shares and exercise price, and continues to vest in accordance with its original vesting schedule, subject to the Reporting Person's continued service with the Issuer.
2. Represents a stock option originally granted by RTB Digital, Inc. on August 12, 2025, which was assumed by the Issuer in connection with the business combination between the Issuer and RTB Digital, Inc. Following the transaction, the option became exercisable for shares of the Issuer's common stock on substantially the same terms as in effect immediately prior to the transaction, with appropriate adjustments to the number of underlying shares and exercise price, and continues to vest in accordance with its original vesting schedule, subject to the Reporting Person's continued service with the Issuer.
/s/ William Sornsin05/27/2026
** 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 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)

FAQ

What does RTB (RTB Digital, Inc.)’s latest Form 3 filing show?

The Form 3 shows COO Sornsin William Carrier Jr’s initial ownership, including 127,314 common shares and multiple stock option grants. It establishes his starting equity position after RTB Digital’s business combination.

How many RTB common shares does COO Sornsin William Carrier Jr hold?

He holds 127,314 shares of RTB common stock directly. This figure reflects his reported beneficial ownership at the time of the filing and serves as a baseline for future Form 4 transaction updates.

What stock options in RTB does the COO report on Form 3?

He reports two stock option positions, each exercisable into RTB common stock. One covers 84,346 shares at $1.89 per share, and another covers 116,705 shares at $0.94 per share, with long-dated expirations.

When do the RTB stock options held by the COO expire?

The options covering 116,705 shares at $0.94 per share expire on May 15, 2034. The options covering 84,346 shares at $1.89 per share expire on August 12, 2035, providing long-term potential equity exposure.

How were the RTB stock options affected by the business combination?

The options were originally granted by RTB Digital, Inc. before the business combination and then assumed by the issuer. They became exercisable for the issuer’s common stock on substantially the same terms with adjusted share numbers and prices.

Do the RTB stock options held by the COO continue to vest?

Yes. The filing explains that each assumed stock option continues to vest under its original vesting schedule. Vesting remains subject to the COO’s continued service with the issuer after the business combination.