Who owns PUT (SPY) SPDR SP 500 ETF JUL 20 18 $256 (100 SHS)? Institutional holders

PUT (SPY) SPDR SP 500 ETF JUL 20 18 $256 (100 SHS): summary

No institution's latest stored 13F report lists PUT (SPY) SPDR SP 500 ETF JUL 20 18 $256 (100 SHS).