Jane Street’s Harbor Osmosis International Resource Efficient ETF EFFI Stock Holding History

Jane Street’s Portfolio EFFI Stock Details EFFI Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$449K	Buy	+18,915	New	+$463K	﹤0.01%	8314
2025 Q2	–	Sell	-24,823	Closed	-$499K	–	11264
2025 Q1	$499K	Buy	+24,823	New	+$497K	﹤0.01%	6865

Other funds holding EFFI

State of Wisconsin Investment Board Madison, Wisconsin $43.7B AUM 27.76% 1-Year Est. Return

GWP

Gateway Wealth Partners Appleton, Wisconsin $2.57B AUM 16.81% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

IAIM

International Assets Investment Management Orlando, Florida $1.67B AUM 28.26% 1-Year Est. Return

UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return

Jane Street's EFFI Position: Q1 2026 in Review

Jane Street opened a new position in Harbor Osmosis International Resource Efficient ETF (EFFI) in Q1 2026: 18,915 shares worth $449K. The stake represents ﹤0.01% of the portfolio and ranks #8314 among its holdings. This is a return to the name: Jane Street previously reported a position in EFFI as recently as Q1 2025.

Jane Street first reported a position in EFFI in Q1 2025 and has held it in 2 quarters since. The position peaked at $499K in Q1 2025. 6 funds tracked by Wall St. Rank hold EFFI as of Q1 2026.

Jane Street held 18,915 shares of Harbor Osmosis International Resource Efficient ETF worth $449K as of Q1 2026.
Harbor Osmosis International Resource Efficient ETF was a new Jane Street position in Q1 2026.
Harbor Osmosis International Resource Efficient ETF made up ﹤0.01% of Jane Street's portfolio in Q1 2026, its #8314 holding.
Jane Street first reported a position in Harbor Osmosis International Resource Efficient ETF in Q1 2025 and has held it in 2 quarters since.
Jane Street's Harbor Osmosis International Resource Efficient ETF position peaked at $499K in Q1 2025.
6 funds tracked by Wall St. Rank held Harbor Osmosis International Resource Efficient ETF as of Q1 2026.

Based on Jane Street's 13F filing for Q1 2026, filed 12 May 2026.