Liftoff Mobile stake of 5.9% reported by Ellis Trust

Liftoff Mobile, Inc. received a beneficial ownership report from Mark E. Ellis, Sydney L. Ellis and the Ellis Trust dated September 11, 2015.

Rhea-AI Filing Summary

Liftoff Mobile, Inc. received a beneficial ownership report from Mark E. Ellis, Sydney L. Ellis and the Ellis Trust dated September 11, 2015. The Ellis Trust directly holds 9,939,671 shares of common stock, par value $0.0001 per share, representing 5.9% of Liftoff Mobile’s outstanding common stock.

Mark E. Ellis and Sydney L. Ellis, as co-trustees of the Ellis Trust, have shared voting and dispositive power over these shares and no sole voting or dispositive power. The 5.9% figure is based on 169,330,527 shares of common stock outstanding after Liftoff Mobile’s initial public offering, including the full exercise of the underwriters’ over-allotment option, as reported in the company’s June 4, 2026 prospectus.

Key Figures

Shares beneficially owned: 9,939,671 shares Percent of class: 5.9% Shares outstanding: 169,330,527 shares +3 more

6 metrics

Shares beneficially owned 9,939,671 shares Common stock held of record by the Ellis Trust dated September 11, 2015

Percent of class 5.9% Beneficial ownership percentage for each reporting person

Shares outstanding 169,330,527 shares Aggregate common stock outstanding after IPO and full over-allotment exercise

Par value $0.0001 per share Par value of Liftoff Mobile, Inc. common stock

Sole voting power 0 shares Sole voting power reported for each Ellis reporting person

Shared voting power 9,939,671 shares Shared voting power held through the Ellis Trust by co-trustees

Key Terms

beneficial owner, shared dispositive power, over-allotment option, initial public offering, +1 more

5 terms

beneficial owner regulatory

"the beneficial owner of any securities reported herein as beneficially owned"

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.

shared dispositive power regulatory

"who hold shared voting and dispositive power with respect to the shares"

over-allotment option financial

"including the exercise in full of the underwriters' 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.

initial public offering financial

"after giving effect to 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.

CUSIP Number financial

"CUSIP Number(s): 53229X101"

A CUSIP number is a nine-character code that uniquely identifies a specific U.S. or Canadian stock, bond, or other security, similar to a barcode or a social-security number for a financial instrument. It matters to investors because it removes confusion between similar securities, ensures trades and settlements are applied to the correct issue, and helps locate official documents and transaction records quickly.

FAQ

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

How much of Liftoff Mobile, Inc. (LFTO) do the Ellis Trust and co-trustees own?

The Ellis Trust, with co-trustees Mark E. and Sydney L. Ellis, beneficially owns 9,939,671 shares of Liftoff Mobile common stock, representing 5.9% of the company’s outstanding common stock based on 169,330,527 shares outstanding.

Who are the reporting persons in this Schedule 13G for Liftoff Mobile, Inc. (LFTO)?

The reporting persons are Mark E. Ellis, Sydney L. Ellis, and the Ellis Trust dated September 11, 2015. The Ellis Trust directly holds the 9,939,671 shares reported, with Mark and Sydney Ellis serving as co-trustees.

What voting power do the Ellis reporting persons have over LFTO shares?

Each reporting person reports 0 shares of sole voting power and 9,939,671 shares of shared voting power. Mark E. and Sydney L. Ellis share voting and dispositive power as co-trustees of the Ellis Trust holding these shares.

How was the 5.9% ownership of Liftoff Mobile (LFTO) calculated for the Ellis Trust?

The 5.9% ownership is calculated using 9,939,671 shares held by the Ellis Trust and total shares outstanding of 169,330,527, as reported by Liftoff Mobile after its IPO, including full exercise of the underwriters’ over-allotment option.

Where is Liftoff Mobile, Inc. (LFTO) headquartered according to this Schedule 13G?

Liftoff Mobile’s principal executive offices are at 900 Middlefield Road, Redwood City, California 94063. This address is also listed as the principal business office for each of the Ellis reporting persons in the ownership filing.

What is the CUSIP and par value of Liftoff Mobile, Inc. (LFTO) common stock in this filing?

The common stock of Liftoff Mobile has a par value of $0.0001 per share and is identified by CUSIP 53229X101. The Ellis Trust’s holdings and percentage ownership are reported for this class of securities.

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

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Available on EDGAR 08/07/2026 - 05:06 PM Accepted by SEC EDGAR 08/07/2026 - 05:06 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Liftoff Mobile, Inc.

(Name of Issuer)

Common stock, par value $0.0001 per share

(Title of Class of Securities)

53229X101

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 53229X101

1

Names of Reporting Persons

Ellis Mark Edward

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 9,939,671.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 9,939,671.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

9,939,671.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.9 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: (1) Consists of 9,939,671 shares of common stock held of record by the Ellis Trust dated September 11, 2015 (the Ellis Trust). The trustees of the Ellis Trust are Mark E. Ellis and Sydney L. Ellis, who hold shared voting and dispositive power with respect to the shares held of record by the Ellis Trust. (2) Based on an aggregate of 169,330,527 shares of common stock outstanding, as reported by the Issuer in the Issuer's prospectus filed under Rule 424(b)(4) filed with the U.S. Securities and Exchange Commission (the SEC) on June 4, 2026, after giving effect to the Issuer's initial public offering (the IPO, including the exercise in full of the underwriters' over-allotment option as announced by the Issuer on June 5, 2026).

SCHEDULE 13G

CUSIP Number(s): 53229X101

1

Names of Reporting Persons

Sydney L. Ellis

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 9,939,671.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 9,939,671.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

9,939,671.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.9 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: (1) Consists of 9,939,671 shares of common stock held of record by the Ellis Trust. The trustees of the Ellis Trust are Mark E. Ellis and Sydney L. Ellis, who hold shared voting and dispositive power with respect to the shares held of record by the Ellis Trust. (2) Based on an aggregate of 169,330,527 shares of common stock outstanding, as reported by the Issuer in the Issuer's prospectus filed under Rule 424(b)(4) filed with the U.S. Securities and Exchange Commission (the SEC) on June 4, 2026, after giving effect to the Issuer's IPO (including the exercise in full of the underwriters' over-allotment option as announced by the Issuer on June 5, 2026).

SCHEDULE 13G

CUSIP Number(s): 53229X101

1

Names of Reporting Persons

Ellis Trust dated September 11, 2015

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 9,939,671.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 9,939,671.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

9,939,671.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.9 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: (1) Consists of 9,939,671 shares of common stock held of record by the Ellis Trust . The trustees of the Ellis Trust are Mark E. Ellis and Sydney L. Ellis, who hold shared voting and dispositive power with respect to the shares held of record by the Ellis Trust. (2) Based on an aggregate of 169,330,527 shares of common stock outstanding, as reported by the Issuer in the Issuer's prospectus filed under Rule 424(b)(4) filed with the U.S. Securities and Exchange Commission (the SEC) on June 4, 2026, after giving effect to the Issuer's IPO (including the exercise in full of the underwriters' over-allotment option as announced by the Issuer on June 5, 2026).

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Liftoff Mobile, Inc.
(b)	Address of issuer's principal executive offices: 900 Middlefield Road, Redwood City, CALIFORNIA, 94063.
Item 2.
(a)	Name of person filing: This Schedule 13G is being jointly filed by each of the following Reporting Persons: (i) Mark E. Ellis, (ii) Sydney L. Ellis and (iii) Ellis Trust dated September 11, 2015 (the Ellis Trust). The Ellis Trust directly holds 9,939,671 shares of the Issuer's common stock, par value $0.0001 per share. Mark E. Ellis and Sydney L. Ellis serve as co-trustees of the Ellis Trust and hold shared voting and dispositive power with respect to the shares held of record by the Ellis Trust. The filing of this Schedule 13G shall not be deemed an admission that any Reporting Person is, for purposes of Section 13(d) or Section 13(g) of the Securities Exchange Act of 1934, as amended, or otherwise, the beneficial owner of any securities reported herein as beneficially owned by any other Reporting Person, except to the extent of such Reporting Person's pecuniary interest therein.
(b)	Address or principal business office or, if none, residence: The address for the principal business office of each Reporting Person is: c/o Liftoff Mobile, Inc. 900 Middlefield Road Redwood, City, California, 94063
(c)	Citizenship: The Ellis Trust is organized in the state of California. Mark E. Ellis and Sydney L. Ellis are citizens of the United States.
(d)	Title of class of securities: Common stock, par value $0.0001 per share
(e)	CUSIP Number(s): 53229X101
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: See Row 9 of the cover page for each Reporting Person.
(b)	Percent of class: See Row 11 of the cover page for each Reporting Person.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: See Row 5 of the cover page for each Reporting Person.
	(ii) Shared power to vote or to direct the vote: See Row 6 of the cover page for each Reporting Person.
	(iii) Sole power to dispose or to direct the disposition of: See Row 7 of the cover page for each Reporting Person.
	(iv) Shared power to dispose or to direct the disposition of: See Row 8 of the cover page for each Reporting Person.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.	Certifications:
	Not Applicable

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Ellis Mark Edward

Signature:	/s/ Mark E. Ellis
Name/Title:	Mark E. Ellis
Date:	08/07/2026

Sydney L. Ellis

Signature:	/s/ Sydney L. Ellis
Name/Title:	Sydney L. Ellis
Date:	08/07/2026

Ellis Trust dated September 11, 2015

Signature:	/s/ Mark E. Ellis
Name/Title:	Mark E. Ellis, Trustee
Date:	08/07/2026

Signature:	/s/ Sydney L. Ellis
Name/Title:	Sydney L. Ellis, Trustee
Date:	08/07/2026

Exhibit Information

Exhibit 1 - Joint Filing Agreement