Harbor ETF Trust - Harbor Osmosis International Resource Efficient ETF (EFFI) Open Interest History

Open interest tracks the total number of outstanding options contracts. Rising OI alongside price moves can indicate growing commitment to the trend; declining OI suggests positions are being closed.

Harbor ETF Trust - Harbor Osmosis International Resource Efficient ETF (EFFI) operates in the Financial Services sector, specifically the Asset Management industry, with a market capitalization near $151.6M, listed on AMEX, carrying a beta of 0.49 to the broader market. EFFI is actively managed investing in resource-efficient companies. public since 2024-12-17.

Open interest history tracks how outstanding options contracts change over time. No recent options activity for EFFI as of 2026-10-15; this typically reflects low options liquidity, a recently listed name, or a temporary data feed delay. Snapshot will refresh on the next active session.

Learn how open interest is reported and how to read the data →