ORS § 59.770
No person shall inflate, depress or cause fluctuations in, or attempt to inflate, depress or cause fluctuations in, or combine or conspire with any other person to inflate, depress or cause fluctuations in, the market prices of stocks or bonds, or of an issue or any part of an issue of such stocks or bonds, by means of pretended purchases and sales, or by any other fictitious transactions or devices, for or on account of any person, whereby either in whole or in part a simultaneous change of ownership of or interest in such stocks or bonds or of such issue or part of an issue thereof, is not effected. A pretended purchase or sale of any stocks or bonds whereby, in whole or in part, no simultaneous change of ownership or interest therein is effected, is prima facie evidence of the violation of this section by the person taking part in the pretended purchase or sale.
ORS 59.770