New York, Jan 22, 2026, 07:47 EST — Premarket
Rambus Inc shares jumped 6.7% to $134.33 in premarket trading Thursday after William Blair launched coverage with an “Outperform” rating. Analyst Sebastien Naji didn’t assign a price target but highlighted Rambus as a leader in DRAM memory solutions, holding over 40% market share in clock driver components for DIMMs—the memory modules used in servers. 1
The jump comes after Rambus surged 14.4% on Wednesday, closing at $125.93 following an intraday peak of $131.12 — a 52-week high, according to the company’s stock quote page. 2
This is significant now as the stock is behaving more like a high-beta AI plumbing play than a niche chip-and-licensing firm. New coverage could attract fresh capital, particularly with shares already surging and short-term bets tightly packed.
The terms used with Rambus might seem like they come from another universe. DRAM refers to the primary “working” memory in computers and servers, while DIMMs are the circuit boards housing that memory inside a server. ASP, or average selling price, simply means the average price per chip or module sold.
BlackRock revealed a 14.0% passive stake in Rambus in an amended Schedule 13G filed with the U.S. Securities and Exchange Commission, reporting beneficial ownership of 15,060,232 shares as of Dec. 31. 3
Rambus, headquartered in San Jose, California, markets memory interface chipsets for server memory modules and licenses interface and security IP for data centers and various other uses, according to a Reuters company profile. 4
But the sprint can turn around just as fast. If upcoming results or guidance fall short of the elevated expectations priced in, the stock could lose those gains in a flash — broker upgrades don’t always hold.
Traders are eyeing if the premarket bid sticks once the market opens, and whether memory-linked semiconductor stocks catch a lift along with it. A swift pullback would suggest the rally might have gotten ahead of itself.
The next major event is Feb. 2, when Rambus plans to hold its quarterly earnings call at 5:00 p.m. EST. Investors will be keen for any guidance and updates on demand linked to AI-driven data center expansions. 5
