Samsung and SK hynix suppliers sell into overlapping pools through two different procurement structures. Samsung procures through its Device Solutions division across Giheung, Hwaseong, Pyeongtaek, Onyang and Cheonan, with equipment affiliate Semes inside the tent. SK hynix procures through a reorganized front-end procurement organization at Icheon and Cheongju, backed by SK Group materials affiliates and a published supplier funding program.
Both sit at the top of the same national supply chain mapped in the reference guide to Korea’s semiconductor industry. Selling to them as one buyer is the most common structural mistake I see foreign equipment and materials companies make. Data current as of August 2026.
How Do Samsung and SK hynix Organize Procurement?
Samsung runs semiconductor purchasing inside its Device Solutions (DS) division and publishes more about the partner base than the org chart. Its 2026 Sustainability Report states that third-party audits, run against Samsung’s Responsible Business Alliance based Supplier Code of Conduct and covering labor rights, occupational safety and health, and environmental management, expanded to 122 first-tier and 39 second-tier suppliers, alongside a Supply Chain Sustainability Committee launched in late 2025. On June 29, 2026, eleven Samsung affiliates, Semes among them, signed a win-win agreement (상생협약) covering roughly 6,700 partner companies, extending a 3.5 trillion won win-win fund (상생펀드) and ESG fund lending at low or zero interest for facility investment, technology development and ESG transition, per The Asia Business Daily. A separate May 27, 2026 pledge of 5 trillion won over five years, reported by Herald Business, splits between shared growth work and AI talent development, so only part of it reaches suppliers.
SK hynix publishes more about the structure itself. A 2024 SK hynix Newsroom interview with Front-End Procurement head Seonghan Kim described a reorganization into three units, Fab Materials Procurement, Equipment and Components Procurement, and a new Risk Management team, evaluating suppliers on quality, cost and technological performance and treating deliberate diversification as standing policy.
Samsung concentrates decisions inside one very large division with a partner base measured in thousands; SK hynix runs a smaller structure where an unfamiliar foreign supplier usually finds a named technical counterpart faster.
What Does Samsung’s Supplier Base Look Like in Practice?
Samsung’s ecosystem is organized around an inner circle formalized as the DS division supplier association, 협성회 (hyeopseonghoe). Its semiconductor newsroom account of the DS division’s April 3, 2026 Win-Win Cooperation Day in Yongin, which drew about 90 attendees from 64 member companies, describes joint technology development projects run with the Ministry of SMEs and Startups that have raised 50 billion won since 2013. Those member companies hold the production-line access, multi-year programs and direct engineering relationships. Samsung’s support mechanisms reward companies already inside the partner structure, and getting in is a separate exercise from being supported once in.
What Does SK hynix’s Supplier Base Look Like in Practice?
On July 2, 2026, SK hynix announced 1.4 trillion won over five years in new supplier support funds, signed by seven SK affiliates including SK hynix and SK Siltron, with more than 100 supplier companies and Korea Fair Trade Commission backing, per ZDNet Korea.
Four components matter: 10 day payment to first-tier small and mid-sized suppliers after the monthly billing close, with an escrow-based shared payment system reaching lower tiers; an Analysis and Measurement Support Center opening high-end analytical equipment to suppliers; an R&D challenge reward program funding up to 50 percent of initial development costs upfront; and Trinity Fab, a testbed of about 1,000 pyeong (평), roughly 3,300 square meters, inside the first Yongin fab, reported by Seoul Economic Daily in March 2026 at a project cost near 860 billion won with about 40 tools, targeted to run from May 2027.
Trinity Fab is the detail worth studying, because production-condition validation without consuming a running line addresses the most expensive constraint in the fab qualification process in Korea: real tool time on a real process. All four run through registered partner status under shared growth (동반성장) programs aimed at domestic partner companies, which is another argument for a Korean entity or a Korean partner.
How Does the Affiliate Dynamic Differ Between the Two?
This is the single largest structural difference, and most foreign suppliers underweight it.
Samsung owns a semiconductor equipment maker: Semes supplies wafer cleaning, track, etch and automation tools, and Samsung Electronics holds 91.54 percent of it. Herald Business reported on May 25, 2026 that Semes posted first-quarter 2026 revenue of about 596.3 billion won and operating profit of 96.1 billion won, with 507.2 billion won, roughly 85 percent, from Samsung Electronics and its overseas subsidiaries. Where Semes fields a competing product, a foreign vendor argues against an affiliate whose economics are internal to the buyer. The category still does not close: Samsung buys Tokyo Electron tracks and SCREEN and Tokyo Electron cleaning tools at leading nodes, so Semes typically holds a share of a category rather than all of it.
SK Group’s semiconductor affiliates concentrate in materials and substrates, and that roster has thinned. SK Siltron, the wafer maker SK bought from LG in 2017, is on its way out: SK Inc. agreed on July 31, 2026 to sell a 70.6 percent stake to Doosan for about 2.3 trillion won, with closing expected by the end of January 2027 subject to regulatory approvals, per SK’s counsel Dechert. Doosan wanted only the profitable silicon wafer business, so the silicon carbide arm was carved out: SK Siltron said in July 2026 it would wind down SK Siltron CSS in Bay County, Michigan, affecting about 140 employees, per The Detroit News. SK Specialty, the specialty gas business formerly SK Materials, went 85 percent to Hahn & Company in March 2025, with SK Inc. retaining 15 percent, per The Korea Herald. SK Enpulse, formerly SKC Solmics, sold its fine ceramics, wet chemical, CMP pad and blank mask lines and merged into SKC on December 23, 2025, per EBN. SK Group has no broad front-end tool maker equivalent to Semes.
Where Are the Fabs, and Why Does Site Geography Matter?
Samsung’s front-end capacity sits in Gyeonggi Province at Giheung, Hwaseong and Pyeongtaek, with Yongin being built for foundry. Back-end and advanced packaging sit further south in South Chungcheong at Onyang and Cheonan, where DigiTimes reported in August 2026 that Samsung would break ground in September on a 6 trillion won HBM and packaging facility.
SK hynix is more compact: Icheon for DRAM, Cheongju for NAND and new capacity, and Yongin under construction. On August 7, 2026 its board approved about 54.3 trillion won (roughly 38 billion dollars) of new fab investment, 35.2 trillion won for Yongin Y2 and 19.1 trillion won for Cheongju M17, per Insight Korea.
Geography is a service cost question first. Supporting Samsung across Gyeonggi and South Chungcheong means separate site engineering teams, and separate security screening and badging for resident engineers at each campus, because access approval is granted per site and does not transfer. Add 24/7 callout expectations and the Korean headcount moves past what a visiting-engineer model carries. Staff against the actual site map, not the company name.
How Is HBM Changing What Both Companies Buy?
HBM has moved a large share of procurement value from front-end wafer processing into back-end bonding, stacking and packaging.
Thermal compression bonding is the clearest public example. TrendForce reported that Hanmi Semiconductor was SK hynix’s exclusive TC bonder supplier from 2017, that Hanwha Semitech was added in March 2025 for dual sourcing, and that by December 2025 roughly half of about 50 HBM4 TC bonder sets came from Singapore-based ASMPT. On June 8, 2026, Hanmi disclosed a 44.2 billion won order for its TC Bonder 4.5 Griffin, per the Seoul Economic Daily; two days later ZDNet Korea reported an order of similar scale to Hanwha Semitech, undisclosed because the unlisted company had no filing obligation. The dispute is open: Hanwha’s infringement suit reached its first hearing at Seoul Central District Court on April 9, 2026, per The Bell, seeking damages and disposal of Hanmi’s Griffin and Dragon bonders, which keeps a court-ordered sales restriction on the table. The Elec separately reported in March 2026 that Hanwha would ship a second-generation hybrid bonding cluster built around its SHB2 Nano bonder to SK hynix as early as April. Plan against a moving allocation.
The base die is the other large difference between the two buyers. SK hynix takes its HBM4 logic base die from TSMC on 12nm for mainstream server parts, and TrendForce reported in March 2026 that it is weighing TSMC 3nm for HBM4E. Samsung builds its HBM4 logic die in its own foundry on 4nm. That moves part of SK hynix’s HBM value chain outside Korea and gives Samsung an internal foundry loop, which matters if your product touches base die processing, test or the logic-to-stack interface.
A sole-source position at a Korean memory maker holds only until the category becomes strategic enough to require redundancy. The growth in addressable spend sits in bonding, inspection, thermal management, cleaning of stacked die, and facility systems around new packaging plants.
What Should Samsung and SK hynix Suppliers Do Differently for Each Buyer?
Vendor registration. A foreign supplier enters either fab’s system through vendor registration (협력회사 등록): Samsung through its supplier portal at secbuy.com, which feeds a registration and evaluation process before a vendor code is issued, SK hynix through its shared growth portal (상생포탈) at gpis.skhynix.com. The vendor code attaches to a legal entity that can hold the purchase contract, invoice in won and dispatch engineers, so a foreign company without a Korean subsidiary transacts through a Korean partner holding the code. Settle who holds it before you start.
Qualification pace. Neither company publishes qualification timelines, and anyone quoting an exact figure is guessing. Plan against the 12 to 18 month baseline in the guide to Korea semiconductor market access.
Affiliate exposure. Check Semes overlap before approaching Samsung, and SKC’s semiconductor materials and back-end lines before approaching SK hynix. Where overlap exists, position as a second source rather than a replacement.
Language and compliance documentation. Korean documentation is a legal requirement before it is a preference. A hazardous chemical entering a Korean workplace needs a Korean-language MSDS (물질안전보건자료) filed with the Korea Occupational Safety and Health Agency under the Occupational Safety and Health Act (산업안전보건법), and a foreign manufacturer appoints a Korea-based only representative to file it. Imported substances above volume thresholds need K-REACH registration through the same route. Contractor work inside a fab falls under the Serious Accidents Punishment Act (중대재해처벌법), which extends the buyer’s safety duty to workers with no employment relationship to it, so the buyer will require Korean-language safety procedures and training records for your engineers. Procurement and technical review run in Korean on top of that. Budget for real localization, covered in technical documentation for Korean fabs.
Contract and payment norms. Both companies pledged 10 day payment to first-tier small and mid-sized suppliers during 2026, Samsung adding 30 days for lower tiers where the first tier participates. Both pledges sit inside the Fair Trade Commission’s fair trade agreement (공정거래협약) and Subcontracting Act (하도급법) framework, scoped to Korean small and mid-sized subcontractors, so a foreign supplier on a direct purchase contract or shipping through a Korean distributor sits outside it and cannot claim those terms. Negotiate your own interval in writing.
Channel. Most small and mid-sized foreign suppliers reach both companies through a Korean distributor or representation partner, which changes the criteria in the guide to choosing a semiconductor distributor in Korea, and post-sale support is where those relationships succeed or fail, as covered in the note on after-sales expectations.
Frequently Asked Questions
Do Samsung and SK hynix use the same suppliers? Heavy overlap at the global equipment and materials tier, meaningful separation below it. Both buy from ASML, Lam Research, Tokyo Electron and the major chemical suppliers. Local bases diverge because each built its own partner programs inside a different chaebol group.
Does Samsung favor Semes over outside equipment suppliers? Samsung Electronics owns 91.54 percent of Semes, and Herald Business reported that roughly 85 percent of Semes first-quarter 2026 revenue came from Samsung and its overseas subsidiaries. Samsung publishes no preference policy and still buys Japanese track and cleaning tools at leading nodes, so assume Semes categories are harder to enter.
Which company is easier for a new foreign supplier to enter? It depends on category and affiliate overlap. SK hynix has published concrete supplier-facing mechanisms in 2026, including Trinity Fab and upfront R&D funding, though those run through registered partner status. Samsung offers larger absolute volume across more sites, against a denser affiliate presence in equipment.
How has HBM changed procurement at both companies? It moved spend toward back-end packaging and bonding and made both buyers dual-source strategic tool categories. SK hynix moved TC bonder supply to a mix of Hanmi, ASMPT and Hanwha Semitech, and takes its HBM4 base die from TSMC while Samsung builds its own on 4nm.
Where to Take This
Map the affiliate overlap for your product, settle who holds the vendor code, staff your Korean support organization against the real site map, and write your documentation for the specific buyer.
Inquivix Technologies works with global equipment, parts and clean-process companies entering Korea’s semiconductor supply chain, covering representation, distribution, technical localization and qualification support at both buyers. To discuss where your product fits at Samsung or SK hynix, contact Joon K Lee at joon@joonklee.com.
