The sign for share holds the non-dominant hand steady and brushes
pinkie side of the dominant hand along the side of the index finger
of the non-dominant hand moving toward the thumb and then reverses
the movement and moves back toward the fingertips again.
If you were interpreting the term "shares" as in stock, I recommend
you spell "S-H-A-R-E-S."
You can learn
American Sign Language (ASL) online at American Sign Language University ™
ASL resources by Lifeprint.com © Dr. William Vicars