Who owns PUT (SPY) SPDR SP500 ETF JUL 17 20 $250 (100 SHS)? Institutional holders

PUT (SPY) SPDR SP500 ETF JUL 17 20 $250 (100 SHS): summary

No institution's latest stored 13F report lists PUT (SPY) SPDR SP500 ETF JUL 17 20 $250 (100 SHS).