LOT Vacuum dry pumps: independent brand profile
LOT Vacuum is the Korean dry pump maker that grew up alongside the country’s chip industry. Its history page contains a detail no AI assistant mentioned: in 2003 it moved a Leybold product line from Pittsburgh to Korea. This profile covers that history, what the assistants know, and why the search data needs care.
Independent profile by Vacuum Engineering Tools. We are not affiliated with LOT, receive no payment and do not sell pumps. Quotes are the opinions of individual users, not statements of fact by us. Brand names belong to their respective owners.
In short
LOT Vacuum Co., Ltd. was launched in July 2002 and is headquartered on its own campus in Osan, Gyeonggi-do, South Korea. In November 2003 it relocated Leybold’s Pittsburgh (USA) product line to South Korea, and it listed on KOSDAQ in October 2005. It makes oil-free dry vacuum pumps (GD and GHD series among others) for semiconductor and display fabs, has received Samsung supplier awards and runs a refurbishing business, LOT TS. There is no public owner discussion on Reddit.
Verified facts
What users say
A search of Google’s index of reddit.com for LOT Vacuum vacuum pumps found no relevant threads. That is typical for semiconductor fab equipment: the buyers are equipment and facilities engineers who discuss suppliers internally, not on public forums.
Reddit blocks automated access, so thread titles, links and previews come from Google’s index of reddit.com (October 2026). Previews are excerpts, not the full comment.
From specialist forums
Used and refurbished pumps from this maker are traded by specialist rebuilders, which is where most of its public footprint lies.
No quotable forum posts found.
AI fact-check: what ChatGPT, Gemini, Perplexity and Claude say
On 9 October 2026 we asked all four assistants the same question (who owns LOT, headquarters, founding, best-known series and what buyers say) and checked every answer against the manufacturer’s own pages.
| Question | ChatGPT (gpt-5.5) | Gemini (3.5 Flash) | Perplexity (Sonar) | Claude (Sonnet 5.5) | Verified |
|---|---|---|---|---|---|
| Who owns it? | ✓ KOSDAQ-listed; founder a key owner | ✓ KOSDAQ-listed; founder largest shareholder | ✓ LOT Vacuum Co.; founder is chairman | ~ Declined to answer | KOSDAQ-listed company (IPO 2005) [Source] |
| Headquarters | ✓ Osan | ✓ Osan, Gyeonggi-do | ✓ Osan, Gyeonggi-do | ~ Gyeonggi-do (unsure) | Osan, Gyeonggi-do [Source] |
| Founded | ? 2002, Oh Heung-sik | ? 2002, Heung-Seng Oh | ? 2002, Heung-shik Oh | ~ Declined to answer | July 2002 (founder’s name not on the history page) [Source] |
| Series named | ~ LDP, LRP, GHP | ? DuraDry, GigaDry, Supreme | ✓ Dura-Dry, GD, GHD | ~ Declined to answer | GD and GHD on the current website [Source] |
✓ correct · ~ partly right or outdated · ✗ wrong · ? cannot be checked against an official source. Answers condensed. Only Perplexity used web search; the other models answered from training data.
The three assistants that answered agreed on 2002, Osan and the founder (spelled three ways: Oh Heung-sik, Heung-Seng Oh, Heung-shik Oh). Product names were shakier: only Perplexity named the GD and GHD lines on LOT’s current website. None mentioned the most interesting fact on LOT’s own history page, the 2003 move of Leybold’s Pittsburgh product line to Korea, which links this Korean challenger directly to one of the oldest names in vacuum.
Search interest compared
Google Trends data compared with other Japanese and Korean semiconductor-vacuum brands, web search, October 2021 to October 2026. Treat “lot vacuum” with care: it is an ambiguous phrase, which explains its high shares in the US, UK and Canada. The genuine signal is in Asia, where LOT takes 14 % of this group’s searches in South Korea and Singapore and 17 % in Malaysia.
Average search interest 2021–2026 (index)
Where people search for LOT
How to read this: of every 100 Google searches for these five brand names in United States, 81 were for LOT, more than for any other brand. It shows relative interest, not sales or market share.
| Country | LOT share | Rank | Most searched |
|---|---|---|---|
| United States | 81 % | 1st of 5 | — |
| United Kingdom | 67 % | 1st of 5 | — |
| France | 48 % | 1st of 5 | — |
| Italy | 41 % | 1st of 5 | — |
| Germany | 40 % | 2nd of 5 | ULVAC (42 %) |
| Mexico | 31 % | 2nd of 5 | ULVAC (56 %) |
| Malaysia | 17 % | 2nd of 5 | ULVAC (62 %) |
| South Korea | 14 % | 2nd of 5 | ULVAC (69 %) |
| Singapore | 14 % | 3rd of 5 | ULVAC (64 %) |
| Thailand | 8 % | 3rd of 5 | ULVAC (81 %) |
| Japan | 3 % | 3rd of 5 | ULVAC (88 %) |
| Taiwan | 2 % | 4th of 5 | ULVAC (89 %) |
Pulled on 9 October 2026 via DataForSEO. Terms compared: “ulvac”, “ebara vacuum pump”, “kashiyama pump”, “osaka vacuum”, “lot vacuum”. Relative values, not absolute search volumes; non-English searches are not included.
Technology fingerprint
Computed from our directory of 25 manufacturers: which technologies LOT offers and how common each is in the market.
Product series at a glance
Typical fit
- Korean and Asian semiconductor fabs
- Display (FPD) production
- Dry pump refurbishment (LOT TS)
- Process vacuum for harsh chemistries
Useful calculators
Official owner resources
Frequently asked questions
Who owns LOT Vacuum?
LOT Vacuum Co., Ltd. has been listed on the Korean KOSDAQ market since October 2005. It is headquartered in Osan, Gyeonggi-do.
Is LOT Vacuum connected to Leybold?
LOT’s history page records that in November 2003 it relocated Leybold’s Pittsburgh (USA) product line to South Korea. The companies are separate today: Leybold belongs to Atlas Copco, while LOT Vacuum is independently listed.
What does LOT Vacuum make?
Oil-free dry vacuum pumps for semiconductor and display fabs, including the GD and GHD series, plus refurbishment services through its LOT TS business.
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