---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-015524"
form_type: "8-K"
ticker: "RNTX"
cik: "0001420565"
company_name: "Rein Therapeutics, Inc."
filed_at: "2026-01-16T23:59:59+00:00"
generated_at: "2026-05-16T09:45:41.455046+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Rein Therapeutics issues $2.5M unsecured promissory note with 20% OID to Funicular Funds

## Summary
- Issued $2.5M principal unsecured promissory note sold for $2M (20% original issue discount) to Funicular Funds, LP.
- Note matures on earlier of next $10M+ equity closing or June 30, 2026; no periodic interest.
- Proceeds from private placement provide working capital; note exempt under Section 4(a)(2) and Rule 506.
- Agreement includes customary representations, warranties, and covenants; note is unsecured.

## SEC filing metadata
- accession: 0001193125-26-015524
- form_type: 8-K
- ticker: RNTX
- cik: 0001420565
- company_name: Rein Therapeutics, Inc.
- filed_at: 2026-01-16T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 1.01, 2.03, 3.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1420565/000119312526015524/0001193125-26-015524-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1420565/000119312526015524/d80335d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-015524
- JSON: https://secwatch.observer/filing/0001193125-26-015524.json
- Plain text: https://secwatch.observer/filing/0001193125-26-015524.txt

## Key facts
- Debt Financings
  Rein Therapeutics, Inc. incurred loan of $2,500,000 with Funicular Funds, LP at 20% original issue discount maturing the earlier of (i) the date of the closing of the next issuance and sale of securities of the Company, in a single transaction or series of related transactions.
  - Instrument: loan
  - Principal: $2,500,000
  - Counterparty: Funicular Funds, LP
  - Rate: 20% original issue discount
  - Maturity: the earlier of (i) the date of the closing of the next issuance and sale of securities of the Company, in a single transaction or series of related transactions
  - Event: incurrence
  source text: the Company issued and sold to Funicular, in a private placement, an unsecured promissory note, dated January 15, 2026, in the original principal amount of $2,500,000 (the “Note”)
  evidence_url: https://www.sec.gov/Archives/edgar/data/1420565/000119312526015524/0001193125-26-015524-index.htm
- Material Agreements
  Rein Therapeutics, Inc. entered into Purchase Agreement with Funicular Funds, LP valued at original principal amount of $2,500,000 (effective 2026-01-15).
  - Action: entry
  - Agreement: equity purchase
  - Counterparty: Funicular Funds, LP
  - Value: original principal amount of $2,500,000
  - Effective: 2026-01-15
  source text: On January 15, 2026, Rein Therapeutics, Inc. (the “Company”) entered into a securities purchase agreement (the “Purchase Agreement”) with Funicular Funds, LP, a Delaware limited partnership managed by Cable Car Capital, LP (“Funicular”), pursuant to which the Company issued and sold to Funicular, in a private placement, an unsecured promissory note, dated January 15, 2026, in the original principal amount of $2,500,000 (the “Note”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1420565/000119312526015524/0001193125-26-015524-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.