Advanced packaging in Korea sits mostly inside Samsung Electronics and SK hynix, with a small merchant subcontractor tier beside them, and the buildout is concentrated in the Chungcheong region: SK hynix’s P&T7 in Cheongju, Samsung’s Onyang and Cheonan sites, and Amkor’s Songdo plant in Incheon. For a foreign equipment or materials supplier, that decides who to call and which layers are winnable.
The corridor these sites belong to is mapped in the reference guide to Korea’s semiconductor industry and its supply chain, and the HBM supply chain in Korea covers stacking, bonding and test as one product’s process chain. This piece treats 후공정 (hugongjeong), the back end, as a capacity buildout: who is building what, what is committed against what is announced, and where the buying differs from front-end fab procurement.
Data current as of September 2026.
How Much Advanced Packaging Does Korea Actually Do?
Korea does a great deal of it, and almost all of it is captive. The merchant packaging and test tier here is small by global standards, so the volume runs through the two memory makers’ own back-end organizations.
The Elec reported on 8 July 2024, citing TechSearch data, that Korea held 4.3 percent of the global outsourced assembly and test market in 2023 against Taiwan at 46.2 percent, with its four Korean names, SFA Semicon, Hana Micron, Nepes and LB Semicon, booking $1.5376 billion combined. The Korean buyer with a packaging budget large enough to matter is usually an integrated device maker. Equipment spending has moved toward the category: SEMI’s release of 7 April 2026 recorded assembly and packaging billings up 21 percent in 2025 and test equipment up 55 percent, against 12 percent for wafer processing, though those are worldwide figures and no Korea-specific back-end number falls out of them.
Where Is Korea Building Advanced Packaging Capacity?
In four tiers, and the tiers commit different amounts of money.
Already running. SK hynix operates six packaging and test facilities at Icheon and Cheongju, and P&T7 will be its seventh, per Today Shinmun on 24 June 2025. For a consumables, parts or second-source tool supplier, those running lines are the near-term revenue and the greenfield sites are the 2028 revenue.
Under construction. SK hynix broke ground on P&T7 in the Cheongju Technopolis complex on 22 April 2026, an advanced packaging fab carrying roughly 19 trillion won, about $13.6 billion at 1,400 won to the dollar, the rate used throughout here. It runs about 230,000 square meters with about 150,000 square meters of cleanroom, three floors of wafer-level packaging over seven floors of wafer test, per the Kyunghyang Shinmun and the SK hynix newsroom. The wafer test line completes in October 2027 and the WLP line in February 2028. SK ecoplant holds the construction contract, per Asia Economy that day. Amkor Technology Korea broke ground on a Songdo test building in Incheon on 19 November 2025, per the Electronic Times, putting 266.1 billion won into three production lines for 2027 operation.
Approved with dates. Asan City and Samsung signed the Onyang investment agreement on 22 July 2026, per the Kyunghyang Shinmun, covering a 31,000 square meter cleanroom and a campus expanding to 420,000 square meters. DigiTimes and TrendForce reported on 20 August 2026 that it carries 6 trillion won, with construction from October 2026 and HBM mass production targeted for May 2029.
Announced. Samsung said it would put about 56 trillion won into Onyang and Cheonan as next-generation HBM bases, per Seoul Economic Daily on 2 July 2026, and Amkor signed a 1 trillion won pact for Gwangju running to 2035. A plan is not a purchase order.
The headline totals need the same care. The trade ministry announced on 29 June 2026, in a release carried by korea.kr, that Chungcheong would become a packaging stronghold with 81 trillion won, about $58 billion. The government then put total Chungcheong investment at 392 trillion won, about $280 billion, a figure sweeping in displays, batteries, substrates and roughly 150 trillion won of data centers. Quote them separately and never add them.
How Does Packaging Procurement Differ From Front-End Fab Buying?
The two run on different sites, through different organizations, against different budget holders inside the same customer.
Samsung’s front-end demand sits in Gyeonggi at Pyeongtaek, Hwaseong and Giheung. Its back-end demand sits in South Chungcheong at Onyang and Cheonan, owned by the Test and System Package (TSP) 총괄 (chonggwal, a division-level organization) inside the Device Solutions division. Samsung folded the Advanced Package (AVP) development organization into TSP in August 2024, per the Electronic Times on 19 August 2024, then reversed the development half of that move. The Bell reported on 27 November 2025 that Samsung transferred the development organizations out of TSP into the business divisions, seating package development next to product planning, while test and package manufacturing stayed with TSP 총괄. Manufacturing and test are the part a supplier sells into, so TSP remains the organization behind the vendor code. A supplier chasing one needs that name; a geography will not produce it. The guide to Samsung’s Pyeongtaek campus and its fab phases makes the same split from the front-end side. SK hynix draws the line by naming it: fabs are M-numbered, packaging and test sites are P&T-numbered.
Qualification attaches to a process lineage. A molded underfill built for SK hynix’s MR-MUF has no place on Samsung’s thermal compression line, and the finished stack then faces the GPU customer’s own qualification, on the 12 to 18 month baseline the guide to the fab qualification process in Korea sets out. Use the buyer’s own platform vocabulary: Samsung Foundry lists 2.5D Cube-S, 2.3D Cube-E, 2.3D Cube-R, 3D Cube-T and 3D Cube-H as its heterogeneous integration set. P&T7’s cleanroom, gas, chemical, abatement and ultrapure water scopes are contracted through SK ecoplant and its subcontractors, a separate buying route from tool procurement, mapped in the guide to the Korea semiconductor equipment market and its buyers.
Which Advanced Packaging Layers in Korea Are Open to a Foreign Supplier?
Concentrated and contested: HBM thermal compression bonding. TechInsights data reported by Sisa Journal-e on 22 December 2025 put Hanmi Semiconductor at 71.2 percent of the HBM TC bonder market on cumulative revenue of $247.7 million through the third quarter of 2025, with Samsung affiliate Semes at 13.1 percent. That is a cumulative history, and the current allocation has moved. SK hynix ordered seven HBM4 TC bonder sets from Singapore-based ASMPT in November 2025, each set carrying two bonding heads, estimated near 30 billion won, per The Elec on 10 December 2025, alongside cumulative 2025 contracts of 80.5 billion won with Hanwha Semitech and 55.2 billion won with Hanmi, per inews24 on 26 February 2026. ASMPT told its 2025 earnings call it was first to win HBM4 12-high TC bonder orders from multiple customers, put its share of the whole TC bonder market including logic at around 30 percent, and targeted 35 to 40 percent of that expanded market by 2028, per inews24 on 19 April 2026. The dual-sourcing history and the Hanmi and Hanwha litigation behind that shift sit in the comparison of Samsung vs SK hynix suppliers. A foreign bonder maker has already taken a large HBM4 allocation, so treat the category as concentrated and contested.
Open, with a foreign incumbent to displace: molding. Sisa Journal-e reported on 13 July 2026 that TOWA holds more than 60 to 70 percent of the global molding equipment market, that both Korean makers depend on Japanese supply for HBM, and that practically no Korean equipment maker can substitute for Japanese molding equipment on advanced lines today. That concentration is where a challenger has room, and the argument runs against another foreign supplier. Korean localization policy funds the search for alternatives.
Open, with a Korean challenger already inside: dicing and grinding. The same report puts DISCO at 70 to 80 percent of wafer grinding and sawing, and that half is moving. EO Technics signed a mass-production evaluation agreement with Samsung for laser grooving and laser stealth dicing aimed at leading-edge foundry and HBM, per The Elec on 16 January 2024, and the Electronic Times reported on 5 September 2025 that it was exchanging evaluation samples with SK hynix, having already supplied Samsung and Micron. Time a dicing entry against a domestic challenger in qualification and a molding entry against an incumbent with none. Those two calendars are about two years apart.
A separate buyer set: package substrates. Samsung Electro-Mechanics announced 8 trillion won for Sejong as an AI server substrate hub and 15 trillion won for Busan, both through 2040, per The Elec on 3 July 2026. Simmtech committed 400 billion won at Cheongju for SOCAMM modules and MSAP substrates, per Ajunews on 2 September 2026. LG Innotek signed a 600 billion won agreement with North Gyeongsang Province and Gumi for FC-BGA line expansion, per the Kyunghyang Shinmun on 25 March 2025. Daeduck Electronics is the fourth name to carry. The Elec reported on 20 July 2026 that it disclosed a further 497 billion won for substrate production equipment and facilities, and on 22 July 2026 that the total committed to high-value substrates now runs past 850 billion won, all of it to be executed by the end of 2027. The two sites do different work: the Siheung B1 centre is adding an FC-CSP building carrying 213 billion won, with production from the third quarter of 2027, while FC-BGA equipment goes into idle space in a new building at the Ansan B2 centre, reviving a 90 to 100 billion won programme announced in 2022. Daeduck is also buying Newflex’s Ansan plant for 52.8 billion won to secure the floor space. These plants buy plating, drilling, lamination, exposure and inspection equipment and their own materials set, and Inquivix Technologies covers this layer as part of Korea’s semiconductor supply chain. Different engineers, different qualification, a vendor list unconnected to fab procurement.
Running in mobile, scaling to AI servers: fan-out panel-level packaging. Samsung has mass-produced FO-PLP since the second half of 2023 on a 415 by 510 millimeter panel, applying it to mobile application processors and watch chips, is keeping that format, and expects mass production of the AI-server generation around 2028, per Samsung packaging executive Lee Hee-seok at the ASPS 2026 forum, reported by Sisa Journal-e on 26 August 2026 and by DigiTimes on 28 August, which noted the divergence from TSMC’s smaller panel. The line sits at Cheonan, in the C1 and C2 buildings taken over from Samsung Display, alongside an HBM test line, per KIPOST on 18 July 2024. Panel lines buy a different lithography, plating, inspection and handling set from wafer lines.
Not yet a market: glass substrates. SKC put a further 281 billion won into Absolics in September 2026, per EBN and the Korea Economic Daily, with the Georgia plant in customer evaluation. Samsung Electro-Mechanics targets 2028 from its Sejong pilot line, per Sisa Journal-e on 28 August 2026, and LG Innotek has moved to 2030 or later, per ZDNet Korea in January 2026. Treat the category as pre-qualification.
What Does Korea’s OSAT and Subcontractor Layer Look Like?
This layer is smaller than the fabs and cheaper to enter, and it is worth entering for the reference. The revenue is small.
Hana Micron, the largest Korean-owned name and headquartered at Asan, will roughly double capital expenditure to about 120 billion won in 2027 from internal cash, has a fifth Asan line under design, and runs its Bac Giang plant in Vietnam exclusively for SK hynix, per Sisa Journal-e on 27 August 2026. SFA Semicon shows the cyclicality: its 11 February 2026 disclosure gives 2025 revenue of 367.4 billion won, down 8.3 percent, with an operating loss of 19.6 billion won. Nepes and LB Semicon sit in bumping and wafer-level packaging.
The test houses are a separate buyer set, and test is the fastest-growing category in SEMI’s equipment forecast: the mid-year forecast of 14 July 2026 put test at $15.3 billion for 2026, up 31 percent, against $6.7 billion and 9.6 percent for assembly and packaging. Doosan Tesna runs system-semiconductor wafer test and is being built into a full turnkey OSAT by its parent group. ZDNet Korea reported on 29 April 2026 that it restarted its suspended second Pyeongtaek plant at 230.3 billion won, targeting completion in November 2027, and separately took on 190.9 billion won of test equipment from Teradyne, Semes and two other vendors. Those are the incumbent platforms a challenger has to argue against. Nepes Ark disclosed 66.7 billion won of new test equipment investment on 26 May 2026. Beneath them sits the probe and socket consumables tier, which renews without capital approval and is the realistic first Korean order for a small foreign supplier: Leeno Industrial makes probe pins and test sockets, and an investment column by a BVF Fund analyst in the regional daily Mudeung Ilbo on 24 August 2025 places it at the head of the non-memory test socket segment, while TSE began supplying HBM4 probe cards to Samsung and is running HBM4E qualification at SK hynix, per Sisa Journal-e on 10 September 2026. Inquivix Technologies works with equipment and materials suppliers across semiconductor test and packaging in Korea.
Amkor Technology Korea is US-owned and runs Songdo, Bupyeong and Gwangju, with Gwangju about 50 percent of Amkor’s production volume and the group about 15 percent of the global packaging and test market, per Seoul Economic Daily on 30 June 2026. The Electronic Times reported on 1 December 2025 that Intel established EMIB assembly at Songdo K5, its first outsourcing of that packaging type. Amkor Korea runs its own supplier registration, separate from the memory makers’ portals, on a shorter decision cycle. Commodity categories can still be set by Amkor group sourcing in the United States and by the end customer’s process specification, which is what the Songdo EMIB line serves, so confirm where your category is decided before treating Amkor as a fast route. A tool running there gives you a Korean install base, a service record and Korean-language documentation that survive a site audit. Samsung and SK hynix committees do not credit an OSAT installation as a qualification shortcut.
What Public Programmes Touch Packaging, and Who Can Use Them?
Two programmes touch packaging, and both run through Korean entities. The advanced packaging leading technology development programme carries 274.4 billion won from 2025 to 2031 under the trade ministry, the first back-end semiconductor project to clear Korea’s preliminary feasibility review, with ten signatories including Samsung Electronics, SK hynix, Hana Micron and Hanmi Semiconductor, per ZDNet Korea on 11 September 2024. South Chungcheong was then selected on 27 April 2026 to build an advanced back-end materials, parts and equipment test bed carrying 30 billion won, with Hana Micron as regional anchor, per Ajunews and a Korea Photonics Technology Institute notice of 30 April 2026.
Every named participant in both is Korean, so treat them as routes reached through a Korean entity or a consortium member. The test bed is the more useful of the two: demonstrating a back-end process on real equipment without consuming a customer’s line removes the constraint that stalls most foreign supplier evaluations.
Which Korean Advanced Packaging Windows Are Open Now?
Four windows are open, each with a published date behind it, and two of them are purchasable this quarter.
P&T7 facility and clean-process packages, Cheongju. SK ecoplant and its subcontractors are specifying and awarding cleanroom, gas, chemical, abatement and ultrapure water scopes now, ahead of the completion dates above. This is the live route through Q4 2026 and Q1 2027.
Amkor Songdo tool and material sets. Equipment and materials selection for the three new lines is current against a 2027 start, and Amkor Korea’s own registration is the entry point.
Onyang. Facility specification lands in 2027 and tool orders across 2027 and 2028, bought by Samsung’s TSP 총괄 in South Chungcheong.
SEMICON Korea 2027, 17 to 19 February at COEX, is the cheapest way to book first meetings, with the preparation sequence in the SEMICON Korea guide for foreign suppliers.
The disqualifications matter as much as the openings. If your product is an HBM thermal compression bonder, two Korean makers hold the cumulative installed base and one is Samsung’s affiliate, so enter the way ASMPT did, on a capability they could not cover. If your Korea plan is sized on merchant packaging volume, correct it: Korea’s OSAT tier held 4.3 percent of the global market in 2023 and its second-largest name lost money in 2025. If your route depends on a government programme and you have no Korean entity, the programme is not your route yet. Vendor registration, tax invoicing and engineer dispatch all attach to a Korean legal entity, which is why most suppliers arrive through the channel assessed in the guide to choosing a semiconductor distributor in Korea.
Frequently Asked Questions
Where is advanced packaging capacity being built in Korea? Mainly in Chungcheong. SK hynix broke ground on the 19 trillion won P&T7 fab at Cheongju on 22 April 2026, with its wafer test line due October 2027 and its packaging line February 2028. Samsung’s 6 trillion won Onyang facility starts construction in October 2026 against a May 2029 target, and Amkor is adding three lines at Songdo in Incheon.
Does Korea have an outsourced packaging industry like Taiwan’s? On a much smaller scale. The Elec, citing TechSearch in July 2024, put Korea at 4.3 percent of the global outsourced assembly and test market in 2023 against Taiwan at 46.2 percent, with its four listed Korean names booking $1.5376 billion combined. Most Korean advanced packaging runs captive inside Samsung and SK hynix back-end sites.
Which advanced packaging equipment can a foreign supplier still sell in Korea? Molding and wafer grinding and sawing remain foreign-held positions, with TOWA and DISCO dominant globally per Sisa Journal-e in July 2026. HBM thermal compression bonding is concentrated and contested: Hanmi held 71.2 percent of cumulative revenue through the third quarter of 2025 on TechInsights data, and SK hynix has since ordered HBM4 bonders from ASMPT, which put its own share of the whole TC bonder market including logic near 30 percent.
How does packaging procurement differ from front-end fab procurement in Korea? Different sites, organizations and budgets. Samsung buys back-end through its Test and System Package organization at Onyang and Cheonan, and front-end at Pyeongtaek, Hwaseong and Giheung, while SK hynix separates its P&T sites from its M-numbered fabs. Back-end tools cost less each and are bought in larger counts per line, so one qualification repeats.
Where to Take This
Korean advanced packaging is a real market with a narrow set of buyers, dated construction milestones and two categories a foreign supplier should walk away from. Map your product to a line and a completion date.
Inquivix Technologies works with global semiconductor equipment, materials and clean-process companies entering Korea’s semiconductor market, covering representation, distribution, technical localization and qualification support. To work through where your product fits the packaging buildout, contact Joon K Lee at joon@joonklee.com.
