Cal. Corporations Code § 25501

Any person who violates Section 25401 shall be liable to the person who purchases a security from, or sells a security to, that person, who may sue either for rescission or for damages (if the plaintiff or the defendant, as the case may be, no longer owns the security), unless the defendant proves that the plaintiff knew the facts concerning the untruth or omission or that the defendant exercised reasonable care and did not know (or if the defendant had exercised reasonable care, would not have known) of the untruth or omission. Upon rescission, a purchaser may recover the consideration paid for the security, plus interest at the legal rate, less the amount of any income received on the security, upon tender of the security. Upon rescission, a seller may recover the security, upon tender of the consideration paid for the security plus interest at the legal rate, less the amount of any income received by the defendant on the security. Damages recoverable under this section by a purchaser shall be an amount equal to the difference between (a) the price at which the security was bought plus interest at the legal rate from the date of purchase and (b) the value of the security at the time it was disposed of by the plaintiff plus the amount of any income received on the security by the plaintiff. Damages recoverable under this section by a seller shall be an amount equal to the difference between (1) the value of the security at the time of the filing of the complaint plus the amount of any income received by the defendant on the security and (2) the price at which the security was sold plus interest at the legal rate from the date of sale. Any tender specified in this section may be made at any time before entry of judgment. In addition to the relief described above, the court shall award reasonable attorney’s fees and costs to a prevailing purchaser or seller who succeeds in establishing a right to the relief provided by this section.