STOCK TITAN

Mercator Acquisition (MRCOU) details sponsor’s 5.75M founder-share stake

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

Rhea-AI Filing Summary

Mercator Acquisition Corp. reported initial insider holdings of 5,750,000 shares of Class B common stock, held indirectly by Mercator Investor Holdings, LLC as sponsor. These Class B shares automatically convert into Class A common stock on a one-for-one basis at the time of the company’s initial business combination and have no expiration date. The sponsor’s holdings include 750,000 shares subject to forfeiture if underwriters do not fully exercise their over-allotment option. Chairman and CEO Shawn Matthews is the sponsor’s sole managing member, with sole voting and dispositive control, and may be deemed the beneficial owner, while disclaiming beneficial ownership where he lacks pecuniary interest.

Positive

  • None.

Negative

  • None.
Insider Matthews Shawn, Mercator Investor Holdings, LLC
Role Chairman and CEO | 10% Owner
Type Security Shares Price Value
holding Class B Common Stock -- -- --
Holdings After Transaction: Class B Common Stock — 5,750,000 shares (Indirect, See footnote)
Footnotes (1)
  1. As described in the registrant's registration statement on Form S-1 under the heading "Description of Securities-Founder Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the registrant's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. These shares of Class B common stock are held directly by Mercator Investor Holdings, LLC (the "Sponsor"), acquired pursuant to a subscription agreement dated as of December 16, 2025 by and among the Sponsor and the registrant. Shawn Matthews, the Chairman and Chief Executive Officer of the registrant, is the sole managing member of the Sponsor. Mr. Matthews has sole voting and dispositive control over the shares held by the Sponsor and may be deemed the beneficial owner of such shares. These shares include an aggregate of 750,000 shares that are subject to forfeiture to the extent that the underwriters do not exercise their over-allotment option in connection with the registrant's initial public offering in full. Mr. Matthews disclaims beneficial ownership over any securities owned by the Sponsor in which he does not have any pecuniary interest.
Class B founder shares held 5,750,000 shares of Class B common stock Indirectly held by Mercator Investor Holdings, LLC as sponsor
Underlying Class A shares 5,750,000 shares of Class A common stock Class B shares automatically convert one-for-one at initial business combination
Shares subject to forfeiture 750,000 shares of Class B common stock Subject to forfeiture if underwriters do not fully exercise over-allotment option
Class B common stock financial
"These shares of Class B common stock are held directly by Mercator Investor Holdings, LLC"
A class B common stock is one of multiple types of a company’s ordinary shares that carries specific rights—often different voting power or dividend priority—compared with other classes. For investors it matters because those differences affect how much influence you have over company decisions, the income you might receive, and how freely the shares trade; think of it like owning a car with different keys: some keys let you start the engine and open the trunk, others only unlock the door.
over-allotment option financial
"subject to forfeiture to the extent that the underwriters do not exercise their over-allotment option"
An over-allotment option is a special agreement that allows underwriters to sell more shares than initially planned if demand is high. Think of it like a retailer offering extra units of a popular product to meet additional customer interest. This option helps ensure the full sale is completed and can also give investors extra shares if they want more.
beneficial owner financial
"may be deemed the beneficial owner of such shares"
A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.
pecuniary interest financial
"disclaims beneficial ownership over any securities owned by the Sponsor in which he does not have any pecuniary interest"
initial business combination financial
"will automatically convert into shares of Class A common stock at the time of the registrant's initial business combination"
An initial business combination is the deal in which a special-purpose acquisition company (SPAC) merges with or acquires an operating business to bring that business onto public markets. Think of the SPAC as an empty shell that raises money from investors, then uses that cash to buy a private company—this transaction turns the private company into a public one and often changes its ownership, valuation, and access to capital, so investors should watch for shifts in risk, future growth prospects, and shareholder rights.
See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google
Add on Google
Learn about SEC filing dates

FAQ

What insider holdings are reported in Mercator Acquisition Corp. (MRCOU) Form 3?

The Form 3 reports that the sponsor holds 5,750,000 shares of Class B common stock of Mercator Acquisition Corp., all held indirectly through Mercator Investor Holdings, LLC.

How will Mercator Acquisition Corp. (MRCOU) Class B shares convert?

The Class B common stock will automatically convert one-for-one into Class A common stock at the time of Mercator Acquisition Corp.’s initial business combination and has no expiration date.

How many Mercator Acquisition Corp. (MRCOU) founder shares are subject to forfeiture?

The sponsor’s holdings include 750,000 Class B shares subject to forfeiture if the underwriters do not exercise their over-allotment option in full in the initial public offering.

Who controls the sponsor shares of Mercator Acquisition Corp. (MRCOU)?

Shawn Matthews, Chairman and CEO, is the sole managing member of the sponsor with sole voting and dispositive control, and may be deemed the beneficial owner, subject to his pecuniary interest.

Is there a market buy or sell transaction in this Mercator Acquisition Corp. (MRCOU) Form 3?

No market buy or sell is reported; the Form 3 discloses existing holdings of Class B founder shares by the sponsor rather than new open-market transactions.
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*
Matthews Shawn

(Last)(First)(Middle)
C/O MERCATOR ACQUISITION CORP.
85 WASHINGTON STREET

(Street)
NORWALK CONNECTICUT 06854

(City)(State)(Zip)

UNITED STATES

(Country)
2. Date of Event Requiring Statement (Month/Day/Year)
07/08/2026
3. Issuer Name and Ticker or Trading Symbol
Mercator Acquisition Corp. [ MRCO ]
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)
XDirector10% Owner
XOfficer (give title below)Other (specify below)
Chairman and CEO
6. Individual or Joint/Group Filing (Check Applicable Line)
Form filed by One Reporting Person
XForm 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 ExercisableExpiration DateTitleAmount or Number of Shares
Class B Common Stock (1) (1)Class A Common Stock5,750,000(2)(1)ISee footnote(2)
1. Name and Address of Reporting Person*
Matthews Shawn

(Last)(First)(Middle)
C/O MERCATOR ACQUISITION CORP.
85 WASHINGTON STREET

(Street)
NORWALK CONNECTICUT 06854

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
XDirector10% Owner
XOfficer (give title below)Other (specify below)
Chairman and CEO
1. Name and Address of Reporting Person*
Mercator Investor Holdings, LLC

(Last)(First)(Middle)
C/O MERCATOR INVESTOR HOLDINGS, LLC
85 WASHINGTON STREET

(Street)
NORWALK CONNECTICUT 06854

(City)(State)(Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer
DirectorX10% Owner
Officer (give title below)XOther (specify below)
Sponsor
Explanation of Responses:
1. As described in the registrant's registration statement on Form S-1 under the heading "Description of Securities-Founder Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the registrant's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date.
2. These shares of Class B common stock are held directly by Mercator Investor Holdings, LLC (the "Sponsor"), acquired pursuant to a subscription agreement dated as of December 16, 2025 by and among the Sponsor and the registrant. Shawn Matthews, the Chairman and Chief Executive Officer of the registrant, is the sole managing member of the Sponsor. Mr. Matthews has sole voting and dispositive control over the shares held by the Sponsor and may be deemed the beneficial owner of such shares. These shares include an aggregate of 750,000 shares that are subject to forfeiture to the extent that the underwriters do not exercise their over-allotment option in connection with the registrant's initial public offering in full. Mr. Matthews disclaims beneficial ownership over any securities owned by the Sponsor in which he does not have any pecuniary interest.
/s/ Shawn Matthews, by Steven Bischoff with Power of Attorney07/08/2026
/s/ Mercator Investor Holdings, LLC, by Steven Bischoff with Power of Attorney07/08/2026
** 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)