BLK Open Interest
Blackrock Inc (BLK) had 45.78K open option contracts as of Nov 4, 2026: 25.99K calls and 19.78K puts. Open interest rose 15.2% over the past four weeks. The put/call open interest ratio is 0.76, so calls outnumber puts.
Open Interest by Strike
Showing results for BLK, 2026-11-06(w), calls & puts
Open Interest Stats
Showing results for BLK, 2026-11-06(w), calls & puts
| Call Open Interest Total | |
|---|---|
| Put Open Interest Total | |
| Open Interest Total | |
| Put-Call Open Interest Ratio |
Highest Open Interest Options
Showing results for BLK, 2026-11-06(w), calls & puts
Open Interest Total by Expiry
Showing results for BLK, 2026-11-06(w), calls & puts. View all expiries
Open Interest History
Showing daily totals for BLK, all expirations, calls & puts. View full history
BLK Open Interest FAQ
What is open interest?
Open interest is the number of option contracts that are open and not yet closed, exercised, or expired. The Options Clearing Corporation calculates it once a day from the previous day's trades, and it is published before the market opens.
How much open interest does BLK have?
Blackrock had 45.78K open option contracts as of Nov 4, 2026. Over the past 30 days, open interest averaged 42.22K contracts.
Is BLK open interest rising or falling?
Open interest rose 15.2% over the past four weeks. It was 39.74K contracts on Oct 7, 2026. See the BLK open interest history for a longer view.
What is the BLK put/call open interest ratio?
The Blackrock put/call open interest ratio was 0.76 as of Nov 4, 2026. Four weeks earlier it was 0.69.
What is Blackrock Inc?
BlackRock is the largest asset manager in the world, with $15.345 trillion in assets under management at the end of June 2026.