Jacobian In calculus, a matrix of partial derivatives.

Johnson curves A family of curves used to model probability density functions.

joint normal distribution A multivariate distribution, all of whose marginal distributions are normal, and such that any linear polynomial of the distribution is normal.

Jones, Alfred W. Pioneer hedge fund manager.

jump-diffusion model A stochastic process that combines random jumps with a geometric Brownian motion.

junior debt Subordinated debt.

junk bond A bond whose credit rating is below BBB-.