---
schema_version: "secwatch.filing_event.v1"
accession: "0001641172-25-015282"
form_type: "8-K"
ticker: "FBLG"
cik: "0001958777"
company_name: "FibroBiologics, Inc."
filed_at: "2025-06-16T23:59:59+00:00"
generated_at: "2026-05-19T07:06:15.912429+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# FibroBiologics closes $5M third tranche of $25M SEPA with Yorkville; funds for R&D and diabetic foot ulcer trial

## Summary
- Third $5M tranche of $15M pre-paid advance drawn; total $15M now under SEPA with YA II PN, Ltd.
- Convertible promissory note: 0% interest (18% on default), matures Dec 20, 2025, convertible at lower of $0.9801 or 94% of 5-day VWAP.
- Proceeds for general corporate purposes, including R&D and Phase 1/2 diabetic foot ulcer trial expected H2 2025.
- Company may sell additional $10M common stock to Yorkville with consent while notes outstanding.
- Conversion limited to 4.99% beneficial ownership cap; prior conversions totaled $5.7M principal at varying prices.

## SEC filing metadata
- accession: 0001641172-25-015282
- form_type: 8-K
- ticker: FBLG
- cik: 0001958777
- company_name: FibroBiologics, Inc.
- filed_at: 2025-06-16T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 1.01, 2.03, 3.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1958777/000164117225015282/0001641172-25-015282-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1958777/000164117225015282/form8-k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001641172-25-015282
- JSON: https://secwatch.observer/filing/0001641172-25-015282.json
- Plain text: https://secwatch.observer/filing/0001641172-25-015282.txt

## Key facts
- Debt Financings
  FibroBiologics, Inc. incurred convertible notes of $5 million with YA II PN, Ltd. at 0% maturing December 20, 2025.
  - Instrument: convertible notes
  - Principal: $5 million
  - Counterparty: YA II PN, Ltd.
  - Rate: 0%
  - Maturity: December 20, 2025
  - Event: incurrence
  source text: The third tranche of the Pre-Paid Advance was disbursed on June 16, 2025 (the “Third Closing”) in the principal amount of $5 million and evidenced by a convertible promissory note (the “Third Promissory Note).
  evidence_url: https://www.sec.gov/Archives/edgar/data/1958777/000164117225015282/0001641172-25-015282-index.htm

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