An upcoming SEC roundtable on September 17, 2026, will shape which blockchain infrastructure Wall Street chooses for round-the-clock stock trading, with Ethereum and Solana competing for what could become the largest financial infrastructure contract in history. The two networks offer starkly different advantages: Solana delivers faster, cheaper transactions and already hosts $465 million in tokenized stocks, while Ethereum boasts deeper institutional relationships through BlackRock, Robinhood, and other major financial players.

The SEC roundtable comes two weeks after the agency proposed modernizing transfer-agent rules, which would update the framework for electronic recordkeeping and blockchain technology in securities transfers. The roundtable itself covers a broader scope, including exchange and broker-dealer readiness, settlement, liquidity, resiliency, and the infrastructure needed for near-continuous trading. Neither Ethereum nor Solana has been selected by regulators, but the language that emerges from the 60-day comment period following the roundtable could determine which network gets the business.

What Makes Solana Attractive for High-Speed Trading?

Solana has built an early lead in tokenized equity activity. The network currently hosts $465 million in tokenized stocks on-chain, with Galaxy Digital also tokenizing its own shares on the network. Solana led all blockchains in tokenized-equity volume and ranked first for real-world-asset inflows in August, attracting $229 million. Transaction fees remain below one cent, and blocks settle in roughly 350 milliseconds, giving the network the speed and cost profile markets need to operate around the clock.

Regulatory positioning adds another advantage. On September 5, 2026, the SEC identified Solana (SOL) as a core exchange-traded fund (ETF) asset, placing it in the same regulatory category as Bitcoin and Ethereum. That recognition does not guarantee that a future Nasdaq-listed product will use Solana, but it removes one potential regulatory hurdle for institutions considering the network.

However, Solana faces a critical weakness that its tokenized-stock figures do not capture. Total value locked (TVL), a measure of capital deployed across applications on the network, has fallen to $5.5 billion, roughly half its previous $11.5 billion level. Much of the network's historic activity came from memecoin trading, while institutional markets require deeper, more durable liquidity, custody, and settlement infrastructure. High trading volume can prove that a network can process transactions, but it does not by itself prove that the network can support a regulated market for listed stocks.

Why Does Ethereum's Institutional Track Record Matter?

Ethereum already has deep ties to the institutions shaping the September 17 roundtable. Robinhood's blockchain is an Ethereum layer 2 (a scaling solution built on top of Ethereum), Circle's Arc is built around Ethereum-compatible infrastructure, and BlackRock's BUIDL tokenized money-market fund launched on Ethereum. That track record gives Ethereum an established path for institutions moving regulated assets on-chain.

BUIDL's presence on Ethereum gives compliance teams a proven institutional example, while Ethereum also offers deep decentralized finance (DeFi) liquidity, broad custodian support, and years of transaction history. Those factors could carry more weight if new rules focus on custody, settlement, auditability, and operational resilience. Ethereum does have some recent weaknesses. The network recorded $453 million in real-world-asset outflows in August 2026, the largest decline among major chains, with much of that capital moving to Solana. Glamsterdam, Ethereum's next major protocol upgrade, has also been pushed into the fourth quarter of 2026, leaving Solana's speed and cost advantages largely unchallenged on the performance side for the rest of the year.

How Institutional Adoption Could Shift the Balance

The competition between these networks hinges on what regulators and market participants identify as necessary for 24-hour, on-chain trading. Requirements around settlement speed, fees, custody, surveillance, and operational resilience could favor different blockchain architectures, making the regulatory language that follows the comment period more consequential than the September 17 meeting itself.

• Settlement Speed: Solana's 350-millisecond block settlement and sub-cent transaction fees give it a performance edge for high-frequency trading, but Ethereum's institutional adoption may matter more if regulators prioritize custody and auditability over raw speed.
• Institutional Infrastructure: Ethereum's existing relationships with BlackRock, Robinhood, and Circle provide a proven path for regulated assets, while Solana's tokenized-equity leadership demonstrates market demand but lacks the operational history institutions may require.
• Regulatory Recognition: The SEC's September 5 classification of Solana as a core ETF asset removes one regulatory barrier, but Ethereum's deeper compliance track record could prove decisive if new rules emphasize settlement auditability and operational resilience.
• Network Liquidity: Ethereum's deep DeFi liquidity and broad custodian support contrast with Solana's recent TVL decline, suggesting that institutional markets may prioritize durable infrastructure over 90-day volume metrics.

Ethereum has the stronger institutional case because BlackRock, Robinhood, and other major financial players already use Ethereum-based infrastructure. Solana leads tokenized-equity activity, but custody depth and operating history could carry more weight than recent volume when the SEC evaluates a network for regulated securities.

That could change if a Nasdaq-listed stock launches on Solana before the second quarter of 2027. A live stock settlement on Solana would give the network a real institutional track record, while sustained Ethereum outflows and further delays to Glamsterdam would add pressure to its existing advantage. The September 17 roundtable will not select a winner, but the regulatory language that follows will shape which network gets the infrastructure contract that could define Wall Street's blockchain future.