The Cost CurveNarrow moat

SK hynix (SKHY) — moat facet

In a market where everyone sells the same thing at the same price, the entire competitive contest is fought over cost per bit -- a number nobody discloses.

Everything in a commodity business eventually reduces to position on the cost curve. If SK hynix can produce a gigabyte more cheaply than the marginal producer, it makes money at prices that hurt the others, and it survives the periods that eliminate them.

Gross margin0%202348.1%202460.4%202579.3%Q1 20262023 was actually negative: ₩32,766bn of revenue against ₩33,299bn of cost.
Almost all of this movement is price. Cost is the part nobody discloses.

The inputs to that position are process node — how small the cells are, and therefore how many fit on a wafer — and yield, and the two interact. Migrating to a denser node lowers cost per bit only once yields on the new node mature, which is why node transitions temporarily raise costs before lowering them, and why a mistimed transition can be worse than not attempting it.

SK hynix's competitive factors, in its own description, lead with pricing and manufacturing costs and yields1. It knows what game it is in.

The difficulty for anyone outside the company is that cost position is almost impossible to observe during a boom. When the price is triple the cash cost, everybody's margins look magnificent and the cost differences between producers disappear into the noise. Cost leadership is only legible in a downturn, when the price approaches somebody's cost and it becomes obvious whose.

The number to watch is gross margin relative to the other two producers in the worst quarter of the next cycle. That single comparison contains more information about the moat than any quarter of this boom.

Moat trajectory: Holding steady

Gross margin rose from 60.4% to 79.3%, which says a great deal about price and almost nothing about relative cost. The cost lead cannot be observed until prices are bad.

The number that tests this moat
Moat Explorer calc
Gross margin, 2025 against Q1 2026
60.4% then 79.3%

Cost of sales of ₩38,456B on ₩97,147B of 2025 revenue, then ₩10,897B on ₩52,576B in the first quarter of 2026. Almost all of that improvement is price rather than cost. The cost position is only observable when prices are poor, which is exactly when it matters.

How it's calculated: Gross profit divided by revenue, from the income statements in the prospectus.
Source: SK hynix Form 424B4 prospectus (10 July 2026) ↗
⚠ Threats to the moat
⚠ THREAT 01
A Cost Lead That Has Not Been Visible Since 2023
A cost advantage only shows up when prices are bad, which means this one has not been tested since the last time it mattered.
References
  1. ReportedSK hynix's stated competitive factors lead with pricing, then manufacturing costs, yields and product availability.
    SK hynix Inc., Form 424B4 prospectus for its Nasdaq offering (SEC, CIK 2120882) — FY2025 revenue W 97,147bn, cost of sales W 38,456bn, gross profit W 58,691bn, S&A W 5,019bn, R&D W 6,466bn and profit for the year W 42,948bn, against FY2024 revenue W 66,193bn / profit W 19,797bn and FY2023 revenue W 32,766bn / cost of sales W 33,299bn / gross loss W 533bn / loss for the year W 9,138bn; Q1 2026 revenue W 52,576bn, gross profit W 41,679bn, profit W 40,346bn. IDC market shares for Q1 2026: second in DRAM at 29.1%, first in HBM at 56.4%, second in NAND at 18.5%, with the three DRAM producers together above 90% of revenue. DRAM products were 77.1% of total sales in 2025 and 77.3% in Q1 2026; NAND 21.3% and 22.0%. Competitors named: Samsung Electronics, Micron Technology and CXMT in DRAM; Samsung Electronics, Kioxia, Micron Technology and Sandisk in NAND; competitive factors listed as 'pricing; manufacturing costs, yields and product availability; product performance, quality and reliability'. First to develop HBM using TSV packaging, commercialised HBM3E in 2024 and developed HBM4 in 2025; HBM carried a per-gigabyte price premium of more than five times traditional DRAM in 2025. M15X cleanroom opened October 2025 with wafer input from Q1 2026; Yongin construction began February 2025 with the first fab's phase-one cleanroom expected Q1 2027; an advanced packaging plant (P&T7) is under construction in Cheongju and one is planned in Indiana for the second half of 2028. Intel's NAND business cost US$6.6bn in December 2021 plus US$2.2bn in March 2025, operated as Solidigm; NAND mass production is transitioning from 176-layer to 238- and 321-layer technologies. Gartner forecasts DRAM revenue of US$143bn in 2025 rising to US$401bn in 2027, HBM US$33bn to US$86bn and NAND US$68bn to US$341bn. A substantial portion of sales is attributable to a limited number of customers located in the United States and China; the two largest were 14.8% and 12.4% of revenue in Q1 2026 and the largest was 23.9% of revenue in 2025. The offering was 177,900,000 ADSs at US$149.00, each ADS one-tenth of a common share, representing 17,790,000 shares against 712,702,365 outstanding; Baillie Gifford, Coatue and Situational Awareness Partners indicated non-binding interest of up to US$7bn. — FY2023-FY2025 and Q1 2026 · publ. 2026-07-10 · source ↗
Sources
Generated September 23, 2026