Here's Why Arista Networks (ANET) is the First Stock I've Purchased in 2026

One of the biggest financial headlines of 2026 is big tech's capex spending. The world's biggest cloud and hyperscale computer operators -- Alphabet (NASDAQ: GOOGL) (NASDAQ: GOOG), Microsoft, Meta Platforms, and Amazon -- have announced plans to invest more than $700 billion to advance their respective artificial intelligence (AI) agendas.

While the vast majority of the total will be spent on the semiconductors needed to process AI, other companies that supply components vital to the operation of data centers will also be recipients of that spending.

One beneficiary will likely be Arista Networks (NYSE: ANET). The company supplies innovative Ethernet switches, routers, and other networking hardware crucial to data center operations. Arista was already at the forefront of the AI revolution, but a recent development suggests 2026 may be the company's best year ever.

The AI bottleneck

The race to adopt AI has been profound, creating a bottleneck in the semiconductor industry. An ongoing shortage of memory chips, including high-bandwidth memory (HBM), DRAM, and NAND, has driven up prices. Despite efforts to ramp up production, these chips remain scarce and command premium prices, a fact Arista Networks' management highlighted during the company's fourth-quarter earnings call.

CFO Chantelle Breithaupt cited the "supply constraint on DDR4 memory." CEO Jayshree Ullal went even further, saying, "In 2026, the situation has worsened significantly." She went on to say, "We are having to smile and take it just about at any price we can get. And the prices are horrendous. They are an order of magnitude exponentially higher."

That would seem to be an ongoing headwind for Arista, but recent developments could dramatically alter the current landscape.

Enter TurboQuant

Google announced a breakthrough earlier this month that could ease the bottleneck in memory chips. The company developed an AI memory-compression algorithm called TurboQuant. "We introduce a set of advanced, theoretically grounded quantization algorithms that enable massive compression for large language models and vector search engines," Google scientists said in the research paper.

The most impactful revelation from this discovery is that the algorithm decreases memory usage "by at least 6x and delivers up to 8x speedup, all with zero accuracy loss, redefining AI efficiency." Simply put, this could reduce the memory (and thereby memory chips) needed by 83%. Since Google made the results public, other companies are sure to adopt this groundbreaking algorithm.

As one of the leaders in memory chips, Micron Technology has taken a beating, with its stock falling as much as 30% since the breakthrough was announced. Just this week, Citi analyst Atif Malik lowered his price target on Micron stock by 17%, to $425 from $510. The analyst cited the already softening prices of DDR memory, as "product prices are down ~ 6% since Micron reported." Futurum analyst Shay Boloor went further, saying, "The market is reading it as a potential headwind for memory names because long-context AI inference may now need far less memory per workload."

While that's undoubtedly bad news for Micron, it's good news for Arista Networks, which will benefit from the lower memory prices.

Robust results despite challenges

In the fourth quarter, Arista Networks delivered record quarterly revenue of $2.49 billion, which grew 29% year over year and 8% compared to Q3. This drove adjusted earnings per share (EPS) of $0.82 up 24%. Moreover, the company's 47.5% operating margin helped Arista surpass a historic milestone: the company generated net income of more than $1 billion in quarterly income for the first time.

Management was also optimistic about the future, raising its 2026 revenue outlook to 25% growth to $11.25 billion and its operating margin to 46%. This forecast was issued early last month, before Google released its compression algorithm. That shows that any easing in memory prices is not baked into Arista's outlook, suggesting there's additional upside ahead.

Arista Networks is down roughly 22% from its peak as investors grew concerned about the future of AI and the stock's lofty valuation. However, after its recent correction, Arista is now trading at 30 times next year's expected earnings, bringing the multiple more in line with its historical average.

As a financial writer, I limit my stock purchases to a few times a year, so as not to run afoul of The Motley Fool's trading rules. That said, the combination of robust growth, a strong outlook, easing input costs, and an attractive valuation convinced me there's a long runway ahead for Arista Networks, which is why it was the first stock I've bought in 2026.

Citigroup is an advertising partner of Motley Fool Money. Danny Vena, CPA has positions in Alphabet, Amazon, Arista Networks, Meta Platforms, and Microsoft. The Motley Fool has positions in and recommends Alphabet, Amazon, Arista Networks, Meta Platforms, Micron Technology, and Microsoft. The Motley Fool has a disclosure policy.