UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No.     )*

Liquidia Corporation

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

53635D202

(CUSIP Number)

January 4, 2024

(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)

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Item 1(a). Name of Issuer

Liquidia Corporation (the “Issuer”)

Item 1(b). Address of Issuer’s Principal Executive Offices

419 Davis Drive, Suite 100

Morrisville, North Carolina 27560

Item 2(a). Name of Person Filing.

This Statement is being filed jointly by each of Legend Aggregator, LP, a Delaware limited partnership, and Legend Aggregator Advisors, LLC, a Delaware limited liability company (collectively with Legend Aggregator, LP, the “Reporting Persons”). Legend Aggregator Advisors, LLC is the general partner of Legend Aggregator, LP. Voting and investment power over the shares held by the Reporting Persons is exercised by a three-member management committee of Legend Aggregator Advisors, LLC, and pursuant to the governing documents of Legend Aggregator Advisors, LLC, voting and disposition decisions require the approval of a majority of such persons.

Item 2(b). Address or Principal Business Office, or if none, Residence

The principal business address of each of the Reporting Persons is 2884 Sand Hill Road, Suite 100, Menlo Park, CA 94025.

Item 2(c). Citizenship

Please refer to Item 4 on each cover page for each Reporting Person.

Item 2(d). Title of Class of Securities

Common Stock, par value $0.001 per share

Item 2(e). CUSIP Number

53635D202

Item 3. If this statement is filed pursuant to Rules 13d-1(b), or 13d-2(b) or (c), check whether the person filing is a(n):

Not applicable.

Item 4. Ownership

See response to Item 9 on each cover page.

See response to Item 11 on each cover page.

See response to Item 5 on each cover page.

See response to Item 6 on each cover page.

See response to Item 7 on each cover page.

See response to Item 8 on each cover page.

Item 5. Ownership of Five Percent or Less of a Class

If the statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following  ☐

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

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. Certification

By signing below, each of the Reporting Persons certify that, to the best of their knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURES

After reasonable inquiry and to the best of its knowledge and belief, the undersigned certifies that the information set forth in this statement is true, complete and correct.

EXHIBIT LIST

Exhibit A

Joint Filing Agreement

The undersigned hereby agree to the joint filing on behalf of each of them of the Statement on Schedule 13G with respect to the Common Stock of Liquidia Corporation, and any further amendments to such statement on Schedule 13G executed by each of them pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended.

The undersigned further agree that each party hereto is responsible for the timely filing of such Schedule 13G and any amendments thereto, and for the completeness and accuracy of the information concerning such party contained therein; provided, however, that no party is responsible for the completeness or accuracy of the information concerning any other party making the filing, unless such party knows or has reason to believe that such information is inaccurate.

This Joint Filing Agreement may be executed in separate counterparts, each of which shall be deemed an original, but all of which shall constitute one and the same instrument.

IN WITNESS WHEREOF, the parties have executed this Joint Filing Agreement on January 16, 2024.