What Is Astera Labs (ALAB) and Why Four Customers Make 82 Percent of Its Revenue

Astera Labs told the SEC that four direct customers paid for 82 percent of its revenue in the three months to 30 June 2026. Its quarterly report filed on 5 August 2026 puts the largest of the four at 29 percent. The company designs connectivity chips that move data inside AI servers.

Every number Astera Labs publishes carries a scope, and the scope decides what it means. The 82 percent counts direct customers, and the filing warns that several of them are manufacturing partners buying on behalf of someone else. The 2025 annual report counts end customers instead, and it puts the top three at roughly 86 percent of that year's revenue.

Astera Labs (ALAB) at a Glance

What Is Astera Labs, and What Does the Company Sell?

Astera Labs runs out of San Jose and sells the parts nobody photographs. Its chips and cable modules connect accelerators to memory and to each other inside an AI server, and they hold a high-speed signal together across a distance that would otherwise wreck it. The quarterly report names four product families. Aries covers PCIe and CXL retimers, Taurus covers Ethernet cable modules, and the remaining two handle memory controllers and fabric switching. The stock trades on the Nasdaq Global Select Market under ALAB, and 173,485,104 shares were outstanding on 31 July 2026.

If you want the man behind it, our profile of the Astera Labs chief executive covers that ground, and this page stays with the filings.

Astera Labs revenue reached $392.400 million in the June 2026 quarter against $191.925 million a year earlier. The management discussion credits higher unit shipments of the Aries, Scorpio and Taurus products, along with higher average selling prices on a mix that leaned toward hardware modules. That same mix cost the company margin, and the filing says so two paragraphs later. Gross margin came in at 73.3 percent against 75.8 percent a year earlier, a fall of 250 basis points.

Why Four Customers Make 82 Percent of Astera Labs Revenue

For the three months ended 30 June 2026 the filing lists four customers above the 10 percent disclosure line. Customer A took 29 percent of revenue, Customer B 25 percent, Customer C 15 percent and Customer D 13 percent. Add them up and you get 82 percent of a $392.400 million quarter from four accounts. A year earlier the same table carried five names and the largest of them sat at 27 percent.

The filing attaches its own warning to that table, and the warning matters more than the number. Certain of those customers are manufacturing partners that buy on behalf of the end customers, so a direct-customer share can move when an end customer shifts volume between partners. Astera Labs customer concentration measured this way tells you who pays the invoice, and it doesn't tell you who wanted the product.

The annual report for 2025 counts a different population and lands somewhere else. Its business section calls the universe of available end customers in the industry "small and concentrated", and it puts the top three end customers at roughly 86 percent of 2025 revenue. One of those figures speaks to demand and the other speaks to billing, and they are not interchangeable.

Our Marvell and Broadcom comparison runs the same customer-list problem through two larger names.

The Word Rack-Scale Lives in One Document and Not the Other

Astera Labs calls itself a leader in semiconductor-based connectivity for rack-scale AI infrastructure. That phrase comes from the earnings release attached to its 8-K of 4 August 2026, where it appears three times alongside one mention of rack-level validation. Search the 10-Q filed the next day for the same word and nothing comes back, in the prose or anywhere in the source file.

The quarterly filing describes the business through products and demand. It names higher unit shipments and higher average selling prices as the drivers, and it leaves the rack to the press release. Both documents are true, and only one of them carries a certification signed under Section 302. If you're pricing the business, that's the one to read first.

What Astera Labs Stock Earns and Where the Money Bills To

Net income for the quarter came to $153.088 million against $51.219 million a year earlier, a rise of 199 percent. Read that figure without the tax line and it shrinks. Income before income taxes came in at $102.825 million against $50.659 million a year earlier. That is a rise of 103 percent, and a $50.263 million income tax benefit carried the rest of the way. Astera Labs stock trades on a bottom line that a single tax item nearly doubled.

The geography table runs the same test again. Revenue by billing address puts China at $152.696 million, Singapore at $113.734 million and Taiwan at $105.768 million, with the United States at $5.531 million. That last line is 1.4 percent of the quarter, on a company headquartered in San Jose.

Read the note above the table before you read the table. It says revenue by location follows the billing address of the customer, and that the population includes the end customers' manufacturing partners and the company's distributors. Our Micron and Dell comparison takes the same question into the server and memory side of the build.

How the ALAB Perpetual Futures Contract Trades on Phemex

Phemex listed the ALABUSDT perpetual on 23 June 2026 at 10:00 UTC, and the series holds 91 daily bars through 21 September 2026. The contract settles in USDT, caps leverage at 10x and pays funding every eight hours. Phemex carries no ALAB spot market, so the ALAB perpetual futures contract is the only way to take a position on this ticker there.

The same TradFi group holds 56 listed stock perpetuals on the anchor date, and our NVIDIA stock page for 2026covers a much larger one.

A stock perpetual keeps quoting when the cash market behind it has closed for the weekend, and that is where the thin bars come from. How Phemex runs stocks and metals around the clock sets out the mechanics.

What the 12.43 Percent Move on 21 September Is Measured Against

ALABUSDT closed 21 September 2026 at 342.47, up 12.43 percent on the session. That percentage is measured against the Sunday 20 September close of 304.61, and the Sunday bar turned over $30,299 against $200,048 on the Monday. Measure the same Monday close against the Friday 18 September close of 302.51 and the move comes to 13.21 percent instead.

One number, two denominators, and the thinner one is what a default screen hands you.

The 91-bar series opened at 401.91 on 23 June 2026 and its highest close is 488.02 on 30 June 2026, so the anchor price still stands 29.8 percent below that high. Its lowest close is 252.31 on 29 July 2026. Ninety-one bars is a short series, which means no 200-day average exists on this contract and anyone quoting one has invented it. There isn't enough history here for the long averages a stock screen assumes. A 50-day average does exist, and across the fifty sessions to 21 September 2026 it comes to 301.72.

Frequently Asked Questions

What did Astera Labs guide to for the September 2026 quarter?

The earnings release of 4 August 2026 puts GAAP revenue in a range of $540 million to $560 million and GAAP gross margin at about 72 percent. It also guides GAAP diluted earnings per share to between $0.87 and $0.92 on roughly 185 million shares.

How big was Astera Labs revenue in 2025?

Full-year 2025 revenue came to $852.525 million against $396.290 million in 2024, a rise of 115 percent. The first half of 2026 alone brought in $700.761 million.

Do Astera Labs earnings show the same growth in operating income?

Operating income for the June 2026 quarter reached $89.248 million against $39.774 million a year earlier, up 124 percent. Research and development spending more than doubled over the same window to $135.898 million.

How many shares of ALAB stock are outstanding?

The 10-Q cover page counts 173,485,104 shares of common stock as of 31 July 2026. Weighted-average diluted shares for the quarter came to 183.3 million.

What does Astera Labs say its gross margin fell on?

The filing blames a shift in product mix toward lower-margin hardware modules, together with the impact of warrants. Over the six months to 30 June 2026 the same measure fell only 80 basis points, to 74.6 percent.

Bottom Line

Every headline number Astera Labs produces has a scope attached, and the scope is where the argument lives. Four customers at 82 percent counts invoices. Three end customers at about 86 percent counts demand. A phrase that carries the whole story in a press release is missing from the filing signed one day later, and a 12.43 percent session becomes a 13.21 percent session once the denominator moves off a weekend mark. Check the scope before you price the number.

Disclaimer: This article is for informational purposes only and is not financial advice. Cryptocurrency trading involves substantial risk. Always do your own research before making investment decisions.