Portfolio management pools risks in a different way: by assembling a diversified portfolio or a portfolio that's negatively correlated with a risk that someone has.

而投资组合管理采用了不同的方式,多元化的资产配置,或者风险负相关性的,投资组合

耶鲁公开课 - 金融市场课程节选

Lee told the agents that S.A.C. covered up insider trading by having different portfolio managers buy and sell a certain stock.

NEWYORKER: A Dirty Business

The purpose is to reduce the risk of a large portfolio loss by balancing portfolio risk among different investment types.

FORBES: Choices in Portfolio Rebalancing

However, to the extent a client reduces portfolio risk by blending in different asset classes, they must be prepared to accept even lower returns commensurate with the reduced portfolio risk.

FORBES: Investors Need To Make Money, Not Beat Benchmarks