Segmentation by type differentiates bio‑based fluids according to their chemical base and formulation architecture. Synthetic ester‑based fluids dominate with an estimated 45% share, owing to their excellent viscosity‑temperature behavior and inherent biodegradability, making them suitable for high‑performance sectors. Polyalphaolefin (PAO)‑derived bio‑fluids capture roughly 30% of the market; their synthetic backbone offers superior thermal stability, appealing to aerospace and industrial machinery users. Natural‑oil‑derived fluids, such as those sourced from rapeseed or soybean, hold about 20%, driven by cost‑competitiveness and strong acceptance in construction equipment where extreme performance is less critical. A niche hybrid category, combining ester and PAO components, accounts for the remaining 5%, targeting applications that require a balance of oxidative resistance and low‑temperature flow. Each type’s proportion reflects a trade‑off between performance specifications, regulatory pressure, and price sensitivity, collectively informing the market taxonomy for bio‑based hydraulic fluids.