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二三六七七九九 · 2021年02月25日

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Sapphire Bay Foundation Case Scenario



Number of holdings: fund/index

A.498/500

B.504/500

C.475/500



Q. As an indexing technique, the number of holdings in Manager B’s index most likely illustrates:

  1. reconstituting.
  2. packeting.
  3. buffering.


C is correct. Buffering involves establishing ranges around breakpoints that define whether a stock belongs in one index or another. Some index providers have adopted policies intended to limit stock migration problems and keep trading costs low for investors who replicate indexes. Size rankings may change daily with market price movements, so buffering makes index transitions a more gradual and orderly process. As long as stocks remain within the buffer zone, they stay in the current index, and as a result, the holdings of the fund may exceed the holdings of the index.


B is incorrect because packeting involves splitting stock positions into multiple parts. For example, if a mid-cap stock’s capitalization increases and breaches the breakpoint between the mid-cap and large-cap indexes, a portion of the total holding is transferred to the large-cap index but the rest stays in the mid-cap index. On the next reconstitution date if the stock value remains large cap and all other qualifications are met, the remainder of the shares are moved out of the mid-cap index into the large-cap index.

请问这题是说协会认为packeting下股票数目其实是和index一致的?不然B为啥是错的呢?谢谢

1 个答案

maggie_品职助教 · 2021年02月26日

嗨,爱思考的PZer你好:


同学,你的问题非常好,是这道题出的有问题的,buffering和packeting都有可能出现持仓超过index的情况,但协会的答案只选C。所以我们把这道题选进经典题时进行了修改,经典题的视频预计最近就会上线,李老师有详细的讲解。


简单来说下为何packeting可能会出现基金持仓超过index的情况:比如一只大盘股基金在一开始的持有和指数一样多的股票(500只),在指数定期调整时发现有4只股票落入大盘股的范畴,就会把它们加进来,然后再剔除市值排在最后的4只股票。注意这是指数的操作。对于基金来说为了降低交易成本选择了“packeting”的机制,那么新进来的4只股票,基金并不全买而是每一种股票只买20%,而指数剔除的4只股票,基金也不会一次性全部卖出,而是每一种只卖20%。这样操作完,相当于剔除的4只股票还在基金中只是相比以前,当前的持仓量少了,但此时又新加入了4只新股票,那么此时基金的持仓就是504,而指数还是500。

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虽然现在很辛苦,但努力过的感觉真的很好,加油!

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