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REX Osprey Solana ETF records no net inflows during most of August trading days.

REX Osprey Solana (SOL) exchange-traded fund (ETF) experienced no trading activity on four out of six trading days leading up to August 8, based on data from Farside Investors data.
Trading under the ticker SSK, the fund recorded no flows on August 1, August 4, August 5, and August 7, with a modest $6.4 million in activity on August 8 and $2.7 million in outflows on August 6.
REX Osprey’s fund is the first Solana ETF listed in the US to incorporate native staking mechanisms. This product functions outside the conventional SEC-registered spot ETF frameworks, providing SOL exposure through indirect means rather than direct cryptocurrency holdings.
Institutional hesitation
CoinShares flow data indicated that Solana products garnered $874 million in inflows year-to-date, trailing behind Ethereum (ETH) and XRP among major cap altcoins, despite being the fourth-largest cryptocurrency by market capitalization.
The trading trend may indicate a broader institutional reluctance toward Solana-focused investment products compared to those centered on Bitcoin (BTC) and Ethereum.
Nansen senior research analyst Jake Kennis attributed the difference to institutional portfolio allocation strategies. He elaborated in a note:
“ETH is witnessing a surge in new activity as institutions were likely underweight ETH in comparison to BTC. Solana has largely remained in the background during this new wave of interest, but SOL ETFs could gain traction if institutions seek to diversify beyond BTC and ETH.”
Structural complexity creates adoption barriers
The design of the REX Osprey fund includes staking mechanisms and offshore ETF allocations, setting it apart from conventional spot cryptocurrency products.
Stabolut founder and CEO Eneko Knörr pointed out these characteristics as barriers to adoption rather than a lack of demand.
Knörr stated:
“SSK’s subdued trading activity appears more like a branding and distribution challenge than a straightforward demand issue. Its structure isn’t merely a ‘spot SOL in a wrapper’—the fund stakes SOL and can allocate a portion into other SOL ETFs/ETPs, many of which are offshore, adding complexity that some investors may avoid.”
The fund imposes a 0.75% management fee, placing it at the higher end of cryptocurrency ETF expense ratios. Traditional spot Bitcoin and Ethereum ETFs from major issuers generally have fees ranging from 0.15% to 0.25%.
Kennis from Nansen remarked that the fee structure prompts a cost-benefit analysis for institutional investors considering direct cryptocurrency exposure versus ETF convenience.
He noted Solana’s approximate 7% annual staking rewards:
“The staking aspect appears to be a significant feature given the ‘passive’ yield that is being overlooked.”
Market positioning and future outlook
The lack of major financial institutions such as BlackRock and Fidelity in the Solana ETF market contributes to limited market penetration.
REX Shares functions as a smaller ETF issuer without the distribution networks and brand recognition of the largest asset managers on Wall Street.
Knörr contended:
“Initial trading will likely remain inconsistent until larger brands enter the market. Structure, complexity, and limited availability are hindering progress—interest in Solana exposure itself does not seem to be the problem.”
As of August 11, the US Securities and Exchange Commission (SEC) continues to evaluate the approval of Solana ETFs under the more tax-efficient 1933 Act.
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