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level 3 concentrated position 的问题

请问老师:用derivative based collar 去hedge employee stock option ,这个derivative based collar是什?怎么hedge?

如你拥有 Employee Stock Options,那就函意你有一個没有流通性的股票 (un-exercised call options).  英文是 You implicitly have a long position of illiquid equity (+S).  To hedge this position risk, "Monetization" is an approach.  That is, you need to create a short position of the equity (-S).  Nevertheless, you are unable to sell the position in that you have an illiquid position.  To resolve this problem, we may consider the concept of PUT-CALL Parity:  
S +P = C + B;  equivalently, -S = [-C +P] +[–B] = [Collar] + [Loan] = a synthetic short position of the stocks, where B is a risk-free bond, C is a call option and P is a put option, respectively.  Therefore, to hedge your long position, you could get a loan (borrowing) and create a zero-premium Collar (by BUYING a publicly traded PUT OPTION from shorting a publicly traded call CALL OPTION)

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回复 2# vchow3
谢谢!!

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