Funicular Funds holds 5.195M shares in Rein Therapeutics (RNTX) — 6.7%

Rhea-AI Filing Summary

Rein Therapeutics, Inc. ownership disclosure: Funicular Funds, LP (with related Cable Car Capital, LP and Jacob Ma‑Weaver) reports beneficial ownership of 5,195,000 shares of Common Stock, equal to 6.7% of the class. The filing states the position includes 420,000 warrants that are subject to a blocker provision preventing exercise that would increase beneficial ownership above 4.99%. The filing ties its percent calculation to 78,039,032 shares outstanding as reported in a Rule 424(b)(5) Prospectus filed May 4, 2026.

Key Figures

Shares beneficially owned: 5,195,000 shares Percent of class: 6.7% Warrants held: 420,000 warrants +3 more

6 metrics

Shares beneficially owned 5,195,000 shares amount reported for Funicular Funds, Cable Car Capital, Jacob Ma‑Weaver

Percent of class 6.7% percent reported for each filing party

Warrants held 420,000 warrants warrants included in the reporting persons' beneficial ownership

Exercise blocker threshold 4.99% blocker provision limiting warrant exercise

Shares outstanding used 78,039,032 shares as reported in Rule 424(b)(5) Prospectus filed May 4, 2026

CUSIP 00887A204 Common Stock, par value $0.001

Key Terms

blocker provision, beneficial ownership, Rule 424(b)(5) Prospectus, warrants

4 terms

blocker provision regulatory

"The Warrants are subject to a blocker provision limiting the reporting person's ability to exercise"

beneficial ownership financial

"The reporting person's beneficial ownership consists of 5,195,000 shares of Common Stock"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

Rule 424(b)(5) Prospectus regulatory

"as reported by the Issuer in the Rule 424(b)(5) Prospectus filed with the on May 4, 2026"

warrants financial

"The reporting person's beneficial ownership consists of 5,195,000 Shares and 420,000 Warrants"

Warrants are special documents that give you the right to buy a company's stock at a set price before a certain date. They are often used as a way for companies to attract investors or raise money, and their value can increase if the company's stock price goes up.

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

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Accepted by SEC EDGAR 05/07/2026 - 06:18 PM Learn about SEC filing dates

FAQ

What stake does Funicular Funds report in Rein Therapeutics (RNTX)?

Funicular Funds reports ownership of 5,195,000 shares, or 6.7%. The filing states this position is calculated using 78,039,032 shares outstanding as shown in a Rule 424(b)(5) Prospectus dated May 4, 2026.

Does the Schedule 13G for RNTX disclose warrants held by the reporting parties?

Yes — the filing reports 420,000 warrants. Those warrants are subject to a blocker provision that limits exercise if it would cause beneficial ownership to exceed 4.99%.

Who is listed as the filing parties on the RNTX Schedule 13G?

The filing lists Funicular Funds, LP; Cable Car Capital, LP; and Jacob Ma‑Weaver. Cable Car Capital, LP is noted as general partner of Funicular Funds, and Mr. Ma‑Weaver is described as managing member of Cable Car Capital.

What headquarters or principal address is shown for Rein Therapeutics in the filing?

Rein Therapeutics' principal executive offices are listed at 12407 N. MOPAC EXPY., SUITE 250 #390, Austin, Texas 78758. This address appears in the Schedule 13G issuer information section.

How was the 6.7% ownership percentage calculated in the RNTX filing?

The percentage is based on 78,039,032 shares outstanding. That share count is cited as reported by the issuer in a Rule 424(b)(5) Prospectus filed on May 4, 2026.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Rein Therapeutics, Inc.

(Name of Issuer)

Common Stock, par value $0.001

(Title of Class of Securities)

00887A204

(CUSIP Number)

05/01/2026

(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): 00887A204

1

Names of Reporting Persons

Funicular Funds, LP

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 5,195,000.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 5,195,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,195,000.00

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)

6.7 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: The reporting person's beneficial ownership consists of 5,195,000 shares of Common Stock (the "Shares") and 420,000 warrants (the "Warrants"). The Warrants are subject to a blocker provision limiting the reporting person's ability to exercise if such exercise would cause the reporting person to beneficially own greater than 4.99% of the Issuer. The foregoing calculation is based upon 78,039,032 Shares outstanding as reported by the Issuer in the Rule 424(b)(5) Prospectus filed with the Securities and Exchange Commission on May 4, 2026.

SCHEDULE 13G

CUSIP Number(s): 00887A204

1

Names of Reporting Persons

Cable Car Capital, LP

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 5,195,000.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 5,195,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,195,000.00

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)

6.7 %

12

Type of Reporting Person (See Instructions)

IA, PN

Comment for Type of Reporting Person: The reporting person's beneficial ownership consists of 5,195,000 Shares and 420,000 Warrants. The Warrants are subject to a blocker provision limiting the reporting person's ability to exercise if such exercise would cause the reporting person to beneficially own greater than 4.99% of the Issuer. The foregoing calculation is based upon 78,039,032 Shares outstanding as reported by the Issuer in the Rule 424(b)(5) Prospectus filed with the Securities and Exchange Commission on May 4, 2026. Cable Car Capital, LP, as the General Partner of Funicular Funds, LP, and Jacob Ma-Weaver, as the Managing Member of Cable Car Capital, LP, may each be deemed the beneficial owner of the Shares held by Funicular Funds, LP.

SCHEDULE 13G

CUSIP Number(s): 00887A204

1

Names of Reporting Persons

Ma-Weaver Jacob

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 5,195,000.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 5,195,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,195,000.00

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)

6.7 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: The reporting person's beneficial ownership consists of 5,195,000 Shares and 420,000 Warrants. The Warrants are subject to a blocker provision limiting the reporting person's ability to exercise if such exercise would cause the reporting person to beneficially own greater than 4.99% of the Issuer. The foregoing calculation is based upon 78,039,032 Shares outstanding as reported by the Issuer in the Rule 424(b)(5) Prospectus filed with the Securities and Exchange Commission on May 4, 2026. Cable Car Capital, LP, as the General Partner of Funicular Funds, LP, and Jacob Ma-Weaver, as the Managing Member of Cable Car Capital, LP, may each be deemed the beneficial owner of the Shares held by Funicular Funds, LP.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Rein Therapeutics, Inc.
(b)	Address of issuer's principal executive offices: 12407 N. MOPAC EXPY., SUITE 250 #390, AUSTIN, TEXAS, 78758.
Item 2.
(a)	Name of person filing: Funicular Funds, LP Cable Car Capital, LP Jacob Ma-Weaver
(b)	Address or principal business office or, if none, residence: 601 California Street, Suite 1151, San Francisco, CA 94108
(c)	Citizenship: Funicular Funds, LP - Delaware Cable Car Capital, LP - Delaware Jacob Ma-Weaver - United States
(d)	Title of class of securities: Common Stock, par value $0.001
(e)	CUSIP Number(s): 00887A204
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: Funicular Funds, LP - 5,195,000 Cable Car Capital, LP - 5,195,000 Jacob Ma-Weaver - 5,195,000
(b)	Percent of class: Funicular Funds, LP - 6.7% Cable Car Capital, LP - 6.7% Jacob Ma-Weaver - 6.7%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Funicular Funds, LP - 5,195,000 Cable Car Capital, LP - 5,195,000 Jacob Ma-Weaver - 5,195,000
	(ii) Shared power to vote or to direct the vote: Funicular Funds, LP - 0 Cable Car Capital, LP - 0 Jacob Ma-Weaver - 0
	(iii) Sole power to dispose or to direct the disposition of: Funicular Funds, LP - 5,195,000 Cable Car Capital, LP - 5,195,000 Jacob Ma-Weaver - 5,195,000
	(iv) Shared power to dispose or to direct the disposition of: Funicular Funds, LP - 0 Cable Car Capital, LP - 0 Jacob Ma-Weaver - 0
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:

By signing below I certify that, to the best of my 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.

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.

Funicular Funds, LP

Signature:	Jacob Ma-Weaver
Name/Title:	Managing Member of the General Partner
Date:	05/07/2026

Cable Car Capital, LP

Signature:	Jacob Ma-Weaver
Name/Title:	Managing Member
Date:	05/07/2026

Ma-Weaver Jacob

Signature:	Jacob Ma-Weaver
Name/Title:	Jacob Ma-Weaver
Date:	05/07/2026

Exhibit Information

Exhibit A