G & S Buttsworth Holdings Pty Ltd investment portfolio

Carbogenics Ltd develops sustainable bio‑char carbon adsorbents from hard‑to‑recycle organic waste and wastewater screenings, offering products that improve anaerobic digestion, remove odours and pollutants from wastewater, and serve as soil‑amendment and carbon‑sequestration solutions for the wastewater‑treatment, anaerobic‑digestion and agricultural markets.

Insignia Technologies develops patented colour‑changing inks and films that provide real‑time visual indicators of carbon‑dioxide, time and temperature, offering products such as freshness tags for healthcare and food packaging and CO₂ leak‑detection tape. Their solutions are marketed to sectors that require rapid visual monitoring of safety, quality and compliance, including healthcare, food packaging and industrial CO₂ systems.