3 Of 4 Pure-Play Semiconductor Foundry Stocks Went Up W/e February 6th

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Introduction

There are only 4 pure-play semiconductor foundries trading on U.S. stock exchanges and they advanced last week and are now up 16.5% YTD. The 4 stocks are outlined below as to their stock performances last week, in descending order, and YTD along with a description of their focus, their market capitalization market share based on revenue, and the reasons contributing to any changes in their stock price.

What Is A Semiconductor?

A semiconductor (aka computer chip or wafer) is a material that has an electrical conductivity value falling between that of a conductor, such as copper, and an insulator, such as glass. In many cases their conducting properties are altered by introducing impurities (doping) into the crystal structure and when two differently doped regions exist in the same crystal, a semiconductor junction is created. Connecting the two materials causes creation of a depletion region near the boundary, as the free electrons fill the available holes, which, in turn, allows electric current to pass through the junction only in one direction. and is the basis of diodes, transistors, and most modern electronics. Silicon is a critical element for fabricating mostelectronic circuits and is the most common semiconductor. After silicon, gallium arsenide is the second-most common semiconductor and is used in laser diodes, solar cells, microwave-frequency integrated circuits, and others.

What Is An Integrated Circuit?

Wikipedia defines an integrated circuit, also known as a microchip, computer chip, or simply chip, as a small electronic device made up of multiple interconnected electronic components, created by photolithographic techniques, which are etched on to a small piece of semiconductor material, usually silicon, which, in turn, is laminated on printed circuit board and fused with a metal alloy to create a permanent bond between metal workpieces to create a finished integrated circuit.

What Is A Pure-Play Semiconductor Foundry? 

A pure-play semiconductor foundry (also known as a fabrication or "fab" plant) does not create its own integrated circuit products but, instead, concentrates all its efforts in the manufacturing of chips based on designs provided by other semiconductor companies which allows it to specialize in manufacturing processes and technologies.

The Pure-Play Semiconductor Foundries Portfolio

.Below are the performances of the 4 stock performances last week, in descending order, and YTD along with information about their respective businesses, a description of each of their focuses, their market capitalization, market share based on revenue, and the reasons contributing to any changes in their stock price.

1. Taiwan Semiconductor Manufacturing Company (TSM): UP 5.5% w/e February 6th; UP 14.8% YTD
   • About: TSM is the world’s  largest foundry company. Its primary fab is in Taiwan with additional wholly owned subsidiary fabs in Japan (2), USA (1); China (1); and Germany (1 – a JV fab with ESMC);
   • Focus: specializes in fabricating leading-edge (3nm, 5nm, 7nm) nodes as well as mature nodes;
   • Market Capitalization: $1.49T;
   • Market Share: 88.4%;
   • Reason For Price Change:
     • TSMC’s rally was driven by leading‑edge scarcity + AI demand + multi‑year growth visibility. The single most important driver of the YTD move was TSCM's reported 26% revenue in Q4 and its guidance of a 30% growth in revenue in 2026.
2. Tower Semiconductor (TSEM): UP 3.6% w/e February 6th; UP 18.4% YTD
   • About: TSEM is domiciled in Israel with a design center there and operates 7 manufacturing facilities: Israel (2); USA (2); Japan (2) and Italy (1 shared with ST Microelectronics);
   • Focus: focuses on analog, RF, power, and mixed-signal nodes for the automotive, industrial, and medical markets;
   • Market Capitalization: $15.7B;
   • Market Share: 1.1%;
   • Reason For Price Change:
     • Tower announced a strategic collaboration with NVIDIA to build 1.6‑terabit data‑center optical modules using Tower’s silicon photonics platform which positions Tower as a critical supplier in next‑generation AI optical interconnects that provides a differentiated specialty‑node capability that peers (UMC, GFS) cannot easily replicate.
3. GlobalFoundries (GFS): UP 1.7% w/e February 6th; UP 22.9% YTD
   • About: GFS is headquartered in New York with fabs in Singapore (2); the U.S. (2); and Germany (1). GFS has already received over $1.5 billion via the CHIPS and Science Act;
   • Focus: focuses on fabricating mature nodes (12nm–90nm);
   • Market Capitalization: $23.8B;
   • Market Share: 5.0%;
   • Reason For Price Change: 
     • The segments where GFS is strongest — automotive, RF, silicon photonics, aerospace/defense — are showing secular growth with the rally being driven by a combination of improving fundamentals, specialty‑node demand strength, and valuation/technical factors.
4. United Microelectronics Corporation (UMC): DOWN 1.2% w/e February 6th; UP 28.0% YTD
   • About: UMC is headquartered in Taiwan, with fabs in Taiwan (8); China (2); Singapore (1) and Japan (1);
   • Focus:  focuses on fabricating mature specialty nodes (28nm-90nm);
   • Market Capitalization: $24.8B;
   • Market Share: 5.5%;
   • Reasons For Price Change:
     • The stock is showing demand recovery, early‑cycle foundry positioning, and new strategic wins that matter specifically for specialty‑node players. In addition, UMC announced a partnership with SST for cutting‑edge automotive technology, opening new high‑value markets which investors view as a multi‑year revenue and margin tailwind..

In Summary:

The above 4 pure-play semiconductor foundry stocks were UP 4.5%, on average, w/e February 6th and are now UP 16.5%, on average, YTD.

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