Sigma SD9 has a Sigma SA Bayonet lens mount and currently there are 77 native lenses available for this mount.
The latest released lenses that are compatible with the SD9 are the Sigma 70-200 F2.8 DG OS HSM S, the Sigma 28mm F1.4 DG HSM A and the Sigma 40mm F1.4 DG HSM A.
Sigma SD9 doesn't have a sensor based image stabilization system but
30 of these lenses already comes with optical image stabilization.
Since Sigma SD9 has a APS-C sensor, it has a focal length multiplier of so you have to multiply lenses original focal length with this multiplier to find the Full Frame equivalent focal length of the lens when mounted on SD9.
You may also also be interested in these:
Sigma SD9 Lenses with Image Stabilization
Sigma SD9 Lenses with Weather Sealings