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曹同学2024-04-15 11:43:50

老师,第七题所说的active share变动是在组合层面的,而不是组合内active weights之间的调整。那组合层面的怎么理解呢?比如石油增1%,石化减1%,这种情况是内部相互抵消没有增减,或者跨行业抵消无增减。

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Simon2024-04-15 13:21:11

同学,上午好。

1. 个股调整是影响的active share。

2. active risk是衡量portfolio和benchmark的偏离程度的,简单来说,portfolio和benchmark越不像,active risk就越大。

那么中石油增加1%,中石化减少1%,虽然active share 增加,但是都是石油行业,这种改变,是认为benchmark和portfolio依然是非常像的,所以active risk认为变化很小。

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追问
那这原版书答案的第一句话是什么意思呢?也就是说个股active shares持仓变化会影响组合整体持仓变化?
追答
Fund 3 held active positions in two automobile stocks—one was overweight by 1 percentage point (pp), and the other was underweight by 1pp.(原本有1% active share) Fund 3 traded back to benchmark weights on those two stocks. (然后调到和benchmark一眼,此时active share=0) In the second trade, Fund 3 selected two different stocks that were held at benchmark weights, one energy stock and one financial stock. Fund 3 overweighted the energy stock by 1pp and underweighted the financial stock by 1pp. (然后又把active share 变为1%) 所以这几步交易后,active share=1%,和一开始是一样的
追问
这两个交易不一样啊,第一个是同行业,交易最后回归,所以没有变化。第二个跨行业交易,并没有回归基准
追答
同学,上午好。 第一笔交易是:Fund 3 held active positions in two automobile stocks—one was overweight by 1 percentage point (pp), and the other was underweight by 1pp.(原本有1% active share) 然后第二笔交易是: Fund 3 traded back to benchmark weights on those two stocks. (然后调到和benchmark一眼,此时active share=0) In the second trade, Fund 3 selected two different stocks that were held at benchmark weights, one energy stock and one financial stock. Fund 3 overweighted the energy stock by 1pp and underweighted the financial stock by 1pp. (然后又把active share 变为1%) 举个例子,benchmark是工商银行40%,建设银行40%,20%陕西煤业,20%爱美客。 portfolio先是工商银行39%,建设银行41%,20%陕西煤业,20%爱美客。那么有1%的active share 然后portfolio把银行调回benchmark,但陕西煤业和爱美客持仓变了,然后工商银行40%,建设银行40%,19%陕西煤业,21%爱美客。那么还是有1%的active share

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