Samsung's 3D Transistor Win Supercharges a Stock Already Up 190% This Year — But Can the Foundry Business Keep Up With the Hype?

Shares of Samsung Electronics extended a blistering rally this week after the company unveiled the semiconductor industry's first vertically stacked transistor, a development that reinforces its AI chip ambitions but also raises the bar for execution in a business still trailing its chief rival.

A Best-in-Show Paper That Could Reshape How Chips Are Built

Samsung demonstrated what it described as the industry's first vertically stacked transistor at a record-small scale , presented at the 2026 VLSI Symposium. In theory, this approach could nearly double transistor density while also improving power efficiency.

The paper received the highest evaluation among more than 1,000 submissions and won the Best Paper award. For investors, this is Samsung proving it can still innovate at the frontier — critical for a company spending record sums to catch up.

A $73 Billion Bet Backing Up the Breakthrough

Samsung plans to spend more than 110 trillion won ($73.3 billion) on chip capacity expansion and research this year, devoting a record amount of capital toward seizing the lead in AI semiconductors.

The company is hiking investment 22% in 2026 to try and retake the lead in AI chips from SK Hynix. The transistor breakthrough gives that massive spending a sharper narrative, but returns remain unproven: Q1 2026 operating profit reached 57.2 trillion KRW, a sevenfold year-on-year increase , driven overwhelmingly by memory, not foundry.

Big-Name Foundry Clients Are Knocking, But the Gap With TSMC Is Still Enormous

Samsung Foundry has either received orders from or is in negotiations with Google, Nvidia, Tesla, AMD, and BYD to manufacture advanced chips based on sub-5nm nodes. Yet the math is humbling: Samsung Foundry held just 6.5% market share in Q1 2026 , versus TSMC's $35.86 billion and 72.3% share.

Analysts suggest Samsung could achieve foundry profitability by Q3 2026 — meaning the unit is still losing money.

The Stock Price Already Reflects a Lot of Good News

Samsung shares have surged, expanding their year-to-date gain to roughly 189% , and Goldman Sachs raised its price target to ₩480,000. At ₩362,500, the stock trades near its 52-week high of ₩370,000. The transistor news cements Samsung's credibility in next-generation chip design, but the real test is whether blockbuster R&D translates into foundry orders that close the revenue chasm with TSMC — and whether memory margins hold when the current AI spending wave inevitably cools.