HKS is one of the most recognised names in Japanese turbo tuning, and its own corporate history is unusually well documented: the company (株式会社エッチ・ケー・エス) has been listed on the Tokyo Stock Exchange since 2013, which means its founding date and timeline are a matter of public financial disclosure, not just enthusiast lore.
A Shed Near Mt. Fuji, October 1973
HKS was incorporated in October 1973 near Fujinomiya, Shizuoka Prefecture, in the shadow of Mt. Fuji, with the stated purpose of developing, manufacturing and selling racing engines and engine parts. According to the company’s own public disclosure history and secondary sources, it was started by Hiroyuki Hasegawa, a former Yamaha Motor engineer, together with a partner. Start-up capital is widely reported to have come from a company called Sigma Automotive, and the name “HKS” is commonly explained as an initialism built from the founders’ and backer’s names. One obituary for Hasegawa (he died in 2016) explicitly identifies him as the “H” in HKS.
From engine work, HKS moved quickly into forced induction: it released its first turbocharger kits in July 1974, just months after founding. Exhaust manufacturing followed in April 1985, when the Kitayama plant in Fujinomiya began producing mufflers — the same Fujinomiya site that is still HKS’s R&D and manufacturing home today.
From a Private Company to a Listed One
HKS’s growth from a Fuji-foothills startup into an international parts brand is laid out, year by year, in its public filings:
- 1996: HKS Europe Limited established in the UK; the sales subsidiary HKS Service was absorbed back into the parent company.
- 1999: Shares registered on the Japan Securities Dealers Association’s over-the-counter market; a new R&D facility opened at Fujinomiya.
- 2001: HKS (Thailand) Co., Ltd. established as the company’s Southeast Asia sales base.
- 2004–2013: Listed on JASDAQ, then moved between JASDAQ venues, before listing on the Tokyo Stock Exchange’s JASDAQ Standard market in July 2013.
- 2012: A Shanghai trading subsidiary established for the Chinese market.
- 2017: HKS USA, Inc. established.
- 2018: Head office relocated from Ota-ku, Tokyo to Misato, Kodama District, Saitama Prefecture.
- 2022: Moved to the Tokyo Stock Exchange Standard Market following the TSE’s market restructuring.
This is a company that has spent five decades moving from one product line to the next — engines, turbos, mufflers, coil springs (from 1994), superchargers (the GT Supercharger line from 2006), bi-fuel conversion kits (2008) — while keeping its Shizuoka roots.
What We Could Not Verify
In keeping with our policy of flagging anything we could not independently confirm:
- We could not find an official HKS statement spelling out exactly what each of the three letters “H,” “K” and “S” stands for. Secondary English-language sources tie the “H” to founder Hiroyuki Hasegawa and describe a partner and a backer (Sigma Automotive) behind the other letters, but we have not located a Japanese-language primary source from HKS itself confirming the full expansion.
- We could not confirm the precise technical meaning of specific turbo model numbers (such as the “2540” designation found on some HKS turbochargers) from an official source.
- Claims occasionally repeated online about HKS involvement in specific land-speed-record runs or Super Taikyu results in its earliest years were not something we could trace to a primary HKS source, so we have left them out of this article rather than repeat them unverified.
Spotted in the Wild
This profile was prompted by a Nissan Skyline GT-R (R32) that came through our own stock fitted with an HKS 2540-series turbocharger and HKS muffler. As with all of our “as described” vehicle write-ups, the turbo designation and muffler fitment are reported as described by the seller, not independently measured by us. See our Nissan Skyline GT-R R32 Wheel Fitment Guide for the wheel and fitment side of that car.
Sources: HKS corporate history as disclosed in HKS Co., Ltd. (株式会社エッチ・ケー・エス, TSE: 7219) public filings (EDINET); HKS USA “About Us”; Hiroyuki Hasegawa obituary, Japanese Nostalgic Car.