“significant change in a related financial instrument position” means, in relation to an entity and a related financial instrument that involves, directly or indirectly, a security of a reporting issuer, any change in the entity’s interest in, or rights or obligations associated with, the related financial instrument if the change has a similar economic effect to an increase or decrease in the entity’s securityholding percentage in a class of voting or equity securities of the reporting issuer by 2.5 percent or more;