Solana News: ETF Inflow Record, Alpenglow Update, and a Treasury Purchase

Solana had a busy week across three separate fronts. US spot Solana ETFs posted their strongest inflow week since launch, a widely shared claim about the network's Alpenglow upgrade turned out to be false, and a public treasury firm added tens of thousands of SOL tokens to its holdings.

Here is what actually happened in each case.

Solana ETF Inflows Hit a Record $188.21 Million

US spot Solana ETFs pulled in a combined $188.21 million in net inflows for the week ending September 25, 2026, the highest weekly total since these Solana funds began trading. All seven Solana ETFs posted positive inflows during the five-day stretch.

The breakdown by fund:

• Bitwise Solana Staking ETF (BSOL): $128.46 million, about 68% of the total

• Grayscale (GSOL): $28.06 million

• Fidelity (FSOL): approximately $17.6 million to $18 million

• Morgan Stanley, VanEck, Franklin Templeton, and 21Shares combined: approximately $14 million

• Friday, September 25 alone: $86.67 million, about 46% of the week's total

Bitwise has led the Solana ETF category since launch. BSOL became the first Solana ETF to cross $1 billion in assets in August 2026. Since these Solana funds began trading, the category has drawn approximately $1.6 billion in cumulative net inflows, with Bitwise accounting for about $1.2 billion of that, a 76% share. This week's 68% share for Bitwise sits below that historical average, meaning the other six issuers captured a larger portion of new Solana money than they typically do.

For comparison, spot Bitcoin ETFs drew about $2.4 billion in inflows over the same week, roughly twelve times the Solana total.

Net inflows measure new money entering the funds after any redemptions are subtracted. This differs from trading volume, which counts the value of ETF shares changing hands between investors.

Solana's Alpenglow Upgrade Did Not Launch on September 28

Separately, a claim spread this week that Solana's Alpenglow consensus upgrade would activate on mainnet on September 28, 2026. Solana developers denied this directly.

Co-founder Anatoly Yakovenko responded to the rumor with a single word on social media: "decel," industry shorthand for decelerate. Roger Wattenhofer, head of research at Anza, the company that develops Solana's Agave validator client, said the protocol had only entered public testing a few days earlier and called the September 28 claim "no Alpenrush."

What Alpenglow actually is:

• Purpose: a consensus upgrade for Solana targeting approximately 150-millisecond transaction finality

• Current finality time on Solana: approximately 12.8 seconds

• Status as of September 28, 2026: in public testing, not live on mainnet

• Where the September 28 date came from: Anza's Agave v4.3 release schedule lists that date for "Mainnet-beta: Resume feature activation," a general window for unrelated protocol changes. Alpenglow is not named in that schedule entry.

• Next tentative mainnet activation window: November 9, 2026, though Anza has not confirmed Alpenglow specifically for that date either

Nothing changed for SOL holders as a result of the rumor. The upgrade remains on testnet with no confirmed mainnet date.

DeFi Development Corp Adds 47,706 SOL to Its Treasury

A third Solana story this week involved DeFi Development Corp (DFDV), a publicly traded company that holds SOL as part of its treasury strategy.

DFDV details:

• SOL added since September 21: 47,706 tokens

• Total SOL treasury as of September 28: approximately 2.54 million tokens

• Approximate value of the treasury: $309 million

• Week-over-week increase: 2%

• Increase since the company's second-quarter report on August 12: 10%

• Tokens added since mid-August: more than 226,000

The company built this position through direct SOL purchases and SOL-equivalent assets.