BIOS Fund I, LP - 06 May 2026 SCHEDULE 13G/A Report for Rein Therapeutics, Inc. Common Stock, $0.001 par value per share (RNTX)

Filing manager
BIOS Fund I, LP
Reporting owner
BIOS CAPITAL MANAGEMENT, LP
Security
Rein Therapeutics, Inc. Common Stock, $0.001 par value per share
Beneficially owned shares
7,797,502 shares
Ownership signal CIK-linked ownership evidence from parsed SEC filings. 2 signals
Large-stake signal

Form

SCHEDULE 13G/A

Passive or exempt beneficial ownership filing.

Ownership

10%

Beneficial ownership of this reported class.

Shares

7,797,502 shares

Shares beneficially owned as disclosed.

Event date

06 May 2026

Date tied to the ownership event or amendment.

Accepted by SEC

08 May 2026

EDGAR acceptance date.

How to read this large-stake filing
  • Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
  • Compare this filing with the holder history and issuer page before treating the percentage as a current position.
  • Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
Class ownership
10%
Subject security Names, identifiers, and filing context for this profile. 2 source fields
Symbol
RNTX
Shares outstanding
78,053,073 shares
Source evidence Original filing metadata and source links for verification. 4 source fields
SEC form
SCHEDULE 13G/A
Accepted by SEC
08 May 2026, 11:33:03 UTC
Event date
06 May 2026
Source filing
View source filing

Key filing fact

BIOS Fund I, LP disclosed 10% ownership in Rein Therapeutics, Inc. Common Stock, $0.001 par value per share (RNTX) on 06 May 2026.

Key facts

  • BIOS Fund I, LP filed SCHEDULE 13G/A for Rein Therapeutics, Inc. Common Stock, $0.001 par value per share (RNTX).
  • Disclosed ownership: 10%.
  • Date of event: 06 May 2026.

Change

  • No earlier schedule filing is available for direct comparison.
  • Current filing was accepted on 08 May 2026, 11:33.

Research use

  • This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
  • Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.

Evidence

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

View source filing

Reporting persons

Disclosed reporting parties (24)

Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.

Name Ownership Shares owned Sole voting power Shared voting power Signature Title CIK
Bios Fund I, LP 2.1% 1,610,565 0 1,610,565 /s/ John Fucci John Fucci/Attorney-in-Fact
BIOS CAPITAL MANAGEMENT, LP 10% 7,797,502 0 7,797,502 /s/ John Fucci John Fucci/Attorney-in-Fact
BIOS FUND II, LP 0.51% 398,767 0 398,767 /s/ John Fucci John Fucci/Attorney-in-Fact
BIOS FUND II QP, LP 1.7% 1,302,654 0 1,302,654 /s/ John Fucci John Fucci/Attorney-in-Fact
BIOS FUND II NT, LP 0.22% 173,217 0 173,217 /s/ John Fucci John Fucci/Attorney-in-Fact
BIOS EQUITY PARTNERS, LP 0% 1,249 0 1,249 /s/ John Fucci John Fucci/Attorney-in-Fact
BIOS CLINICAL OPPORTUNITY FUND, LP 3% 2,313,797 0 2,313,797 /s/ John Fucci John Fucci/Attorney-in-Fact
BIOS FUND III QP, LP 1.7% 1,332,850 0 1,332,850 /s/ John Fucci John Fucci/Attorney-in-Fact
BIOS FUND III NT, LP 0.27% 214,346 0 214,346 /s/ John Fucci John Fucci/Attorney-in-Fact
BIOS ADVISORS GP, LLC 10% 7,797,502 0 7,797,502 /s/ John Fucci John Fucci/Attorney-in-Fact
BIOS FUND III, LP 0.26% 204,092 0 204,092 /s/ John Fucci John Fucci/Attorney-in-Fact
BIOS EQUITY COF, LP 2.2% 1,751,288 0 1,751,288 /s/ John Fucci John Fucci/Attorney-in-Fact
BIOS EQUITY PARTNERS II, LP 2.4% 1,874,638 0 1,874,638 /s/ John Fucci John Fucci/Attorney-in-Fact
BIOS EQUITY PARTNERS III, LP 2.2% 1,751,288 0 1,751,288 /s/ John Fucci John Fucci/Attorney-in-Fact
CAVU ADVISORS, LLC 10% 7,797,502 0 7,797,502 /s/ John Fucci John Fucci/Attorney-in-Fact
CAVU MANAGEMENT, LP 10% 7,797,502 0 7,797,502 /s/ John Fucci John Fucci/Attorney-in-Fact
LESLIE W. KREIS 10% 7,797,502 0 7,797,502 /s/ John Fucci John Fucci, as Attorney-in-Fact for Leslie W. Kreis, Jr.
AARON G.L. FLETCHER 10% 7,797,502 0 7,797,502 /s/ John Fucci John Fucci, as Attorney-in-Fact for Aaron G.L. Fletcher
BIOS FUND I QP, LP 1.2% 941,887 0 941,887 /s/ John Fucci John Fucci/Attorney-in-Fact
Bios LTI Co-Invest III QP, LP 5.5% 4,303,099 0 4,303,099 /s/ John Fucci John Fucci/Attorney-in-Fact
Bios LTI Co-Invest III, LP 5.4% 4,198,037 0 4,198,037 /s/ John Fucci John Fucci/Attorney-in-Fact
Bios LTI SPV II, LP 1.9% 1,487,007 0 1,487,007 /s/ John Fucci John Fucci/Attorney-in-Fact
Bios 2026 Co-Invest, LP 1.3% 1,000,000 0 1,000,000 /s/ John Fucci John Fucci/Attorney-in-Fact
Bios 2024 Co-Invest, LP 0.72% 562,695 0 562,695 /s/ John Fucci John Fucci/Attorney-in-Fact
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