Crystalline forms of squalamine

A crystalline phosphate hydrate of Compound I:

• wherein the crystalline phosphate hydrate comprises Form A1 and/or Form C, wherein:
• a) Form A1 is characterized by an X-ray powder diffraction (XRPD) pattern having peaks (Cu Kα1 radiation) at 3.96°, 8.59°, 10.84°, 11.49°, 13.27°, 13.89°, 15.27°, 15.52°, 15.78°, 15.98°, 17.72°, 17.91°, 18.76°, 19.18°, 19.37°, 20.44°, 20.58°, 20.80°, 21.24°, 21.76°, 22.18°, 23.09°, 23.35°, 23.83°, 24.02°, 24.53°, 25.10°, 25.48°, 25.81°, 26.14°, and 26.67° (each ±0.01°2θ);
• and
• b) Form C is characterized by an X-ray powder diffraction (XRPD) pattern having peaks (Cu Kα1 radiation) at 3.82°, 8.22°, 10.55°, 11.19°, 11.45°, 11.99°, 13.35°, 13.77°, 14.05°, 14.59°, 15.14°, 15.63°, 16.39°, 16.89°, 17.28°, 17.94°, 18.57°, 18.92°, 19.39°, 19.75°, 20.71°, 21.16°, 21.45°, 21.99°, 22.49°, 22.98°, 23.26°, 23.79°, 24.11°, 24.59°, and 24.91° (each ±0.01°2θ).