Who owns PUT (SPY) SPDR S&P 500 ETF TRUST 05/17/2019 USD270? Institutional holders

PUT (SPY) SPDR S&P 500 ETF TRUST 05/17/2019 USD270: summary

No institution's latest stored 13F report lists PUT (SPY) SPDR S&P 500 ETF TRUST 05/17/2019 USD270.