MENU

Harmonic Drive Systems | Company Profile

← Back to Drones & Robotics guides

COMPANY PROFILE / DRONES AND ROBOTICS

Harmonic Drive Systems
The strain wave gear reducers inside robot joints: about 30% of sales go to industrial robots, and AI robots are starting “more slowly than assumed”

Harmonic Drive Systems makes the reducers that slow rotation and raise force inside robot joints. Its main “Harmonic Drive” is a strain wave gear that uses the flex of thin metal, and its annual securities report says it is built into the joints of industrial robots. Consolidated sales for the year to March 2026 were ¥59.6 billion; the securities report does not state the share going to industrial robots, and a chart in the earnings briefing implies about 30% (our calculation). The company says demand from AI robots is starting more slowly than assumed, and has revised its medium-term plan to add aerospace and defense and e-mobility as growth fields. This article sets out what it sells, how far the numbers are disclosed, and which parts of the AI-robot story are company statements and which are unconfirmed, within what the securities report and official pages say. Checked 25 October 2026.

Built from Harmonic Drive Systems’ annual securities report (38th fiscal year, on EDINET), its earnings briefing for the first quarter of the year to March 2027, and the business and R&D pages of its website / Checked 25 October 2026

What this article covers
  1. Harmonic Drive Systems in 30 seconds, and where it stands in drones and robotics
  2. The logo and how the name is written
  3. Where the company sits in drones and robotics
  4. Scale (focused on robots)
  5. Resources committed to robots
  6. What it has done so far
  7. What comes next
  8. What the company is aiming for in drones and robotics
  9. Map of partnerships in drones and robotics
  10. Technology, products and services
  11. The risks this company carries
  12. Glossary / References / Claim-to-source audit

1. Harmonic Drive Systems in 30 seconds, and where it stands in drones and robotics

LEGAL NAMEHarmonic Drive Systems Inc.English name as in the annual securities report
HEADQUARTERSShinagawa, Tokyo,
Japan
Main departments are concentrated in Azumino, Nagano
LISTINGTokyo Stock Exchange
Prime Market
Moved from the Standard Market in February 2026 (securities report)
TYPE IN THIS FIELDComponents &
enabling software
Precision parts such as strain wave gears. The grouping is ours
CONSOLIDATED SALES¥59.6 billionYear to March 2026. Up 7.0%
REDUCERS SHARE77.8%By product group (reducers ¥46.3 bn; mechatronics ¥13.2 bn)
SHARE TO INDUSTRIAL ROBOTSNot stated in the
securities report
The briefing chart implies about 30% (our reading and calculation)
EMPLOYEES1,419Consolidated. Plus 342 temporary staff
The one point to hold on to

Harmonic Drive Systems does not make robots. It makes the reducers inside robot joints. A reducer turns a motor’s fast rotation into slower, stronger rotation. Its “Harmonic Drive” is a strain wave gear that uses the flex of thin metal, and the company says it is small, light and highly accurate in positioning Sourced. The annual securities report says it is built into the joints of industrial robots and has won a high share in the world market (the company’s claim; no share figure could be confirmed).

What matters here is that the securities report does not give the share of sales going to industrial robots. The application chart in the earnings briefing implies about 30%, but that is our reading and calculation Our calculation. The company also says that demand from humanoid and AI robots is starting up “more slowly than assumed”, and its new medium-term plan adds aerospace and defense and e-mobility as growth fields beyond robots Sourced.

2. The logo and how the name is written

A note on names: the company is Harmonic Drive Systems Inc. “Harmonic Drive”, “Accudrive” and “Harmonic Planetary” are registered product names (reducers), not company names. Harmonic Drive SE of Germany (formerly Harmonic Drive AG) and Harmonic Drive LLC of the US are consolidated subsidiaries and separate legal entities. This article follows the company names in the securities report.

Source of the logo image: https://www.hds.co.jp/Portals/0/files/common/images/logo_blue.png

3. Where the company sits in drones and robotics

Companies in this field are easiest to understand by what they build and who buys it. Harmonic Drive Systems is in “components & enabling software”: it sells the parts that make robot joints to robot and equipment makers. It does not build the final product.

Four types of company in drones and robotics Even among “robot companies”, strengths and challenges depend on what is built and who buys it Humanoids & physical AI Industrial & specialist robots Drones & eVTOL Components & enabling software Humanoid, learning robots Factory, medical, inspection Aircraft and operations Parts and AI behind robots Figure AI / Boston Dynamics Unitree / UBTech FANUC / Yaskawa Universal Robots / Intuitive DJI / Skydio Zipline / Joby Harmonic Drive NVIDIA Promise of learning Track record, reliability Air uses; rule compliance Presence in supply chains Scale-up still under way Adapting to change; price Rules and safety approval Demand follows shipments Harmonic Drive: “components & enabling software”; reducers for robot joints (our grouping) About 30% of sales go to industrial robots (our calculation); the securities report gives no ratio
Fig. 1 The four types of company in drones and robotics, and where Harmonic Drive sits. The grouping is ours; company names are examples from companies covered in this series Our calculation. The grouping of Harmonic Drive is ours. The “weakness” row describes the type in general, not Harmonic Drive itself.
Sales to industrial robots (quarterly, billion yen) Values we read from the company’s briefing chart (its own classification). Not from the securities report 4.13 bn yen Apr-Jun 2025 4.47 bn yen Jul-Sep 2025 4.63 bn yen Oct-Dec 2025 6.38 bn yen Jan-Mar 2026 4.92 bn yen Apr-Jun 2026 Share of consolidated sales: 30.6% / 31.2% / 32.2% / 36.7% / 29.5% (our calculation)
Illustration Sales to industrial robots were largest in January to March 2026 at ¥6.38 billion (briefing chart). The application split is the company’s own classification; how a customer’s end use is assigned could not be confirmed.

4. Scale (focused on robots)

The company reports a single segment, “precision reducers”, and robot-only profit is not disclosed. Whole-company figures are as follows (¥ million) Sourced.

Item (¥ million)FY2023 (year to Mar 2024)FY2024 (year to Mar 2025)FY2025 (year to Mar 2026)
Consolidated sales55,79655,64659,558
Operating profitNot checked62,567
Ordinary profit5701512,540
Net profit (loss) attributable to owners of the parent(24,807)3,4741,609
Orders (consolidated)Not checkedNot checked61,613
Category (year to March 2026)Sales (¥ million)Share and change
Reducers (Harmonic Drive and others)46,33377.8% (up 9.5%)
Mechatronics products (actuators and others)13,22422.2% (down 0.9%)
Japan (segment)26,626Up 22.5%
North America12,107Up 4.1%
Europe16,776Up 0.7%
China4,046Down 28.0% (lower sales to industrial robots)
R&D, investment and peopleContent
R&D expenses¥3,950 million (year to March 2026). 151 R&D staff
Total capital expenditure¥4,796 million. North America ¥2,261 million (production capacity up 13%), Japan ¥1,421 million, China ¥108 million
Employees (consolidated)1,419 (plus 342 temporary staff). Robot-dedicated headcount is not disclosed
A caution

The figures above are for the whole company. Robot-only sales, profit, R&D and headcount are not stated in the securities report and are not disclosed Not yet confirmed. The “sales to industrial robots” below are reference values we read from a chart in the briefing materials, not a ratio the company has stated.

Sales to industrial robots (read from the briefing chart)

PeriodConsolidated sales (¥ million)Industrial robots (¥ million)Share (our calculation)
Apr to Jun 202513,4964,12630.6%
Jul to Sep 202514,3424,47131.2%
Oct to Dec 202514,3454,62632.2%
Jan to Mar 202617,3746,38436.7%
Subtotal (year to March 2026)59,55719,60732.9%
Apr to Jun 202616,6814,92029.5%

From the chart “Consolidated sales by application (quarterly)” we read the bottom segment, which matches the first legend item (industrial robots). The chart also has semiconductor equipment, machine tools, medical, AI robots, aerospace and defense, automotive and others. The AI robot segment is small and hard to read accurately, so we do not use its figures. Shares are “application amount divided by the quarter’s consolidated sales”, our calculation Our calculation.

5. Resources committed to robots

We sorted four angles (people, money, outside relationships, research institutions) by whether the securities report and official pages confirm them. “Not stated” is also a result.

AngleWhat we could confirmType
People1,419 consolidated employees. 151 R&D staff. An office in Silicon Valley for research and surveys. Robot-dedicated staff are not disclosedSourced / not disclosed
MoneyR&D ¥3,950 million and capital expenditure ¥4,796 million (whole company, year to March 2026). New production machinery in North America lifted local capacity by 13% (December 2025). Robot-only amounts are not disclosedSourced / not disclosed
PlantsJapan: the Hotaka plant in Azumino, Nagano, and others. Cross roller bearings, a key part of the reducer unit, are made by the subsidiary Harmonic Precision (Matsumoto, Nagano). Bases also in Massachusetts (US) and GermanySourced
Outside investments, acquisitions and joint venturesHarmonic Drive SE in Germany: 25% in 2002, 35% in 2008, additional shares bought in March 2017 with the Innovation Network Corporation of Japan (INCJ, formerly a state-backed fund) to make it a subsidiary (74.7% held), and full ownership in July 2021. Harmonic Drive LLC in the US also became wholly owned in February 2021. A 49.2% stake in Ome Casting (equity-method, unconsolidated subsidiary) since 2008Sourced
Universities and institutionsDeveloped an ultra-small reducer for a robot hand with the Ishikawa laboratory of the University of Tokyo (the need was raised in 2000; a 13 mm outer-diameter unit was delivered in 2001). Examples of partners include Akita University, Osaka University, the National Institute of Advanced Industrial Science and Technology, Shinshu University, the University of Tokyo, Tohoku University and Nagoya Institute of Technology. Public research funding was not found in the sources we checkedSourced / not confirmed

Main products (as far as official company sources confirm)

All performance values are the company’s stated values. We do not compare with other makers’ products or rank them. Checked on 25 October 2026.

Name (type)Main specifications (company description, conditions)Deployment recordStage and dateSource
Harmonic Drive (strain wave gear reducer)Three parts. Standard reduction ratios of 1/30 to 1/320. No gap where the teeth mesh, allowing accurate positioning (company description)Used in industrial robots, semiconductor equipment, satellites, advanced medical equipment and more (company statement). Units and customers not disclosedOn sale (production began in 1970)Refs. 1, 3
Accudrive and Harmonic Planetary (planetary reducers)Ratios of 1/3 to 1/45. A proprietary mechanism to remove backlash (play between gears) (company description)Industrial robots, machine tools and others. Units not disclosedOn sale. The FPA series (AC servo actuator with a planetary gear) was added in the year to March 2026Refs. 1, 3
CSF-mini (compact unit type)A compact unit in a field the company focuses on. New model numbers were added in the year to March 2026 (securities report)Units not disclosedOn sale (models added)Ref. 1
CSF-3 (13 mm outer diameter)A small strain wave gear delivered to a University of Tokyo laboratory in 2001. The company calls it the “world’s smallest” (company claim)For robot-hand research. Later made a standard product, and won an award from the Organization for Small and Medium Enterprises and Regional Innovation at the 2007 Robot Award (company statement)Offered as a standard product (timing not confirmed)Ref. 4
AC servo actuators (FHA-Cmini series and others)Drive units combining a reducer, motor and sensor. The LW type is lighter and shorter (company description)Units not disclosedOn sale (added in the year to March 2026)Refs. 1, 3
What this table could not confirm

Customer names (robot makers and others), shipment numbers, prices and independent third-party verification of performance are not stated in the sources we checked Not yet confirmed. “High share” and “world’s smallest” are the company’s statements, and we cannot back them with figures.

6. What it has done so far

WhenEventMeaning
1970Founded as a joint venture of Hasegawa Gear and USM of the US. Began making Harmonic Drive reducers at the Matsumoto plantStart of the Harmonic Drive business under a technology tie-up with USM (company history)
1977Began making and selling factory-automation equipment (now mechatronics products)From reducers to drive units
1990Completed the Hotaka plant in Azumino, Nagano, and moved production thereThe area where main departments are still concentrated
2000 to 2001At the request of the Ishikawa laboratory of the University of Tokyo, developed and delivered a 13 mm reducer and an ultra-small servo motorFor a robot hand the size of a finger
March 2017Made Harmonic Drive AG (now SE) of Germany a subsidiary by buying shares with INCJBrought the European business in
2021Made Harmonic Drive LLC of the US (February) and Harmonic Drive SE of Germany (July) wholly ownedFull ownership in North America and Europe
Year to March 2024Net loss attributable to owners of the parent of ¥24.8 billion (five-year indicators)The cause is not stated in the report we used (only the figures)
13 May 2024Announced a medium-term plan for FY2024 to FY2026 (targets included ¥90 billion in FY2026 sales)The company says the pace of AI robot adoption now differs from the assumptions
February 2026Moved to the Tokyo Stock Exchange Prime MarketChange of market segment (securities report)
16 June 2026Filed the 38th annual securities report and drew up a new medium-term plan (FY2026 to FY2030)Focus shifted to AI robots, aerospace and defense, and e-mobility

7. What comes next

The company shows a new medium-term plan (FY2026 to FY2030) and a forecast for the year to March 2027. Targets and forecasts are the company’s own and are not accomplished fact Not yet confirmed.

FY2030 TARGETSales of ¥100 billion or moreOperating margin of 15% or more; ROE and ROIC of 10% or more (company targets)
GROWTH FIELDSAI robots, aerospace and defense, e-mobilityAs stated in the new medium-term plan
FORECAST, YEAR TO MARCH 2027Sales of ¥74.5 billionRaised on 7 August 2026 (from ¥68.0 billion). Operating profit ¥8.5 billion
EARLIER TARGET¥90 billion in FY2026 salesThe old plan published in May 2024, now revised

On the gap between the old plan’s assumptions and reality, the company writes that expectations for the AI robot market over the medium to long term are unchanged, but that it is at a very early stage and the pace of adoption in society is departing from assumptions Sourced. It gave as its reason for raising the forecast in August 2026 higher demand for reducers and mechatronics products across main applications, mainly industrial robots and semiconductor manufacturing equipment (briefing materials).

What we could not confirm

Sales to AI robots and humanoid robots, customer names, the scale of mass production and details of capacity expansion plans are not stated in the sources we checked Not yet confirmed. The securities report says only that it “won orders as customers in AI robots moved to mass production” and that “orders from AI robot customers in North America increased”.

8. What the company is aiming for in drones and robotics

This section includes points the company does not state directly. They are inferences read from primary sources, shown with their basis.

What we readPrimary source basisType
About 30% of sales go to industrial robots, so robot demand swings hit the company directlyBriefing chart (32.9% by our calculation). Securities report risk: most products are parts for industrial robots, semiconductor equipment and similar machines, so capital-spending trends matterSourced / Our calculation
AI robots contribute little to sales so far and have started more slowly than assumedSecurities report: the field is at an early stage and adoption differs from assumptions. The AI robot amounts in the briefing chart are smallSourced
The new plan aims to widen the pillars of sales beyond robotsAerospace and defense and e-mobility were added as growth fields; the report also lists satellites, advanced medical equipment and automotive as uses of its reducersInference
It is adding capacity in North America to meet AI robot demandOrders from AI robot customers in North America rose (securities report), and North American production capacity rose 13% (December 2025). Customers are undisclosed, so the link is our inferenceInference
Profitability is recovering with higher salesOperating profit rose from ¥6 million to ¥2,567 million. The company cites a better manufacturing cost ratio from higher plant utilisationSourced
One inference in more detail

The securities report says that in North America “orders from defense uses fell, but orders from AI robots rose, and sales rose 4.1%”, and, in its capital-spending section, that production machinery introduced in North America raised that unit’s capacity by 13% Sourced. Reading the two together, the company may be adding local capacity to capture AI robot demand in North America Inference. However, the purpose and customers are not stated, and the machinery would also serve other uses, including industrial robots. The report goes no further than “orders as AI robot customers move to mass production”, and the real scale of mass production could not be confirmed Not yet confirmed.

9. Map of partnerships in drones and robotics

Relationships around Harmonic Drive Systems Only ties stated in official sources. Customers are undisclosed, so not shown (checked 25 Oct 2026) Harmonic Reducer maker Univ. of Tokyo (Ishikawa lab) Finger-size reducer developed AIST and universities Examples of research partners INCJ (former state fund) Joint buyer of the German firm Harmonic Drive SE (Germany) Wholly owned (July 2021) Harmonic Drive LLC (US) Wholly owned (February 2021) Ome Casting 49.2% stake (2008); equity method Joint work, research Investment / acquisition
Fig. 2 Source: securities report (38th fiscal year) and the company’s “Joint development with industry, government and academia” page. Only relationships stated in official sources are shown. The main customers (robot makers and others) could not be named from the securities report or official pages, so they are not shown.

Because it is a parts maker, the most important relationship, with customers, does not appear in the map. The securities report speaks of “diverse customers” and discloses almost no individual customer names Not yet confirmed. We do not name any robot maker as a user of its reducers.

10. Technology, products and services

The products fall into two groups: reducers (Harmonic Drive and planetary reducers) and mechatronics products (actuators and controllers that combine a reducer with a motor, sensors and so on).

How a strain wave gear (Harmonic Drive) works Our illustration from the company’s description (metal elasticity, three parts) and general explanations 1. Oval cam Turned by the motor (the input side) 2. Thin metal cup Pushed into an oval by the cam, it meshes with the outer teeth (elasticity) 3. Ring with inner teeth The difference in tooth count makes it creep, turning slowly, with force Company: only three parts, standard ratios of 1/30 to 1/320, and no gap where the teeth mesh Part names (wave generator, flexspline, circular spline) are the usual terms; this is our simplification
Illustration A Harmonic Drive flexes a thin metal cup with a cam so that it meshes with outer teeth, obtaining a large reduction ratio from few parts.
CategoryContent (company description)Plain explanation
ReducersHarmonic Drive (strain wave gear); Accudrive and Harmonic Planetary (planetary reducers)Reducer: a part that slows rotation and raises force
Mechatronics productsActuators and others that combine a reducer, motor, sensor, driver and controller. Used mainly in semiconductor manufacturing equipmentActuator: a drive unit that produces motion
Cross roller bearingsA key part of reducer units. Made and processed by the subsidiary Harmonic PrecisionBearing: a part that supports rotation
Core technologiesPrecision cutting, thin-walled metal parts, small-module gears, precision grinding and measurementSmall-module gear: a gear with very small teeth
A materials engineer’s view: metal that flexes, again and again

In a strain wave gear a thin metal part flexes with every turn and springs back Sourced. Because robot joints are used for a long time, the metal must resist fatigue (weakening from repeated stress) and keep its shape after machining (a general point). The company lists thin-walled metal part machining, small-module gear machining, precision grinding and precision measurement as core technologies, but it does not disclose which alloys or heat treatments it uses Not yet confirmed.

On developing the 13 mm unit, the company says the parts and gears were so small that “machining and measurement required technology and skill in unknown territory” (company description). Casting (through its stake in Ome Casting) and steels for bearings are likely to be involved on the materials side, but suppliers and material names could not be confirmed. It helps to read this with our explainers on speed reducers and gears, joint actuators, and structural materials for robots and drones.

11. The risks this company carries

RiskContentType
Demand swingsMost products are parts for industrial robots, semiconductor and flat-panel equipment and similar machines, so they follow capital spending and market conditions (the company rates likelihood “high” and impact “large”)Sourced
Build-to-orderMany products are made to order to customer-specific specifications; long lead times can cost ordersSourced
Slow start of AI robotsThe pace of adoption differs from assumptions. The old plan (¥90 billion in FY2026 sales) was revisedSourced
Lower sales to ChinaIn the year to March 2026, sales in China fell 28.0% on lower sales to industrial robotsSourced
Intangible assets of the European subsidiaryCustomer-relationship assets of ¥9,187 million and technology assets of ¥2,454 million at Harmonic Drive SE. If its plan is missed, an impairment may follow (at the previous year-end the company saw signs of impairment but recognised no loss)Sourced
Financial covenantsLoan agreements require net assets to stay at 70% or more of the larger of the prior year-end and March 2024 levels, and no ordinary loss in two consecutive yearsSourced
Tariffs, currencies and sourcingThe report mentions U.S. additional tariffs, currency swings and higher energy and logistics costs from tensions in the Middle EastSourced
QualityUnexpected product defects could occur (the company rates likelihood “high”)Sourced
Aerospace and defensePositioned as a growth field. No specific products or customers could be confirmed, and this article does not cover them (we do not cover attack weapons)Not yet confirmed

12. Glossary

Reducer
A part that turns a motor’s fast rotation into slower, stronger rotation.
Strain wave gear (Harmonic Drive)
A reducer that uses the flex of thin metal to get a large reduction ratio from few parts.
Planetary reducer
A reducer in which several gears orbit a central gear.
Reduction ratio
How many times slower the output turns than the input. 1/100 means one-hundredth.
Backlash
The gap (play) where gear teeth mesh. The smaller it is, the more accurate the positioning.
Actuator
A drive unit that produces motion. The core of a robot joint.
AC servo motor
An alternating-current motor whose position and speed can be controlled precisely.
Cross roller bearing
A type of bearing that supports a rotating shaft.
Industrial robot
An arm-type robot that welds, moves or assembles in a factory.
AI robot
The company’s term for a robot that uses AI to act according to the situation.
Mechatronics
Technology combining mechanics and electronic control.
Equity method
Accounting that takes in an investee’s profit in proportion to the ownership share.
INCJ
The former Innovation Network Corporation of Japan, a state-backed fund.
ROE / ROIC
Profit relative to equity or to invested capital.
Annual securities report
The yearly report that listed Japanese companies file with the government, published on EDINET.
A joint reducer inspection is paired with an explanatory internal model. Precision, transmitted load, wear and life matter; the drawing does not specify a product tooth profile or performance.
Fig. 3. Concept illustration generated with ImageGen. A joint reducer inspection is paired with an explanatory internal model. Precision, transmitted load, wear and life matter; the drawing does not specify a product tooth profile or performance. Not an actual product, facility or measurement. Cutaways, colours and arrows explain the concept; proportions are illustrative.

13. References

  1. Harmonic Drive Systems Inc. Annual Securities Report (Yuka Shoken Hokokusho), 38th fiscal year (1 April 2025 to 31 March 2026), filed with the Kanto Local Finance Bureau on 16 June 2026 (in Japanese; public PDF on EDINET, Japan’s official disclosure system). Company overview, history, business, results, trends by use and region, R&D, capital expenditure, employees, risks, medium-term plan. https://disclosure2dl.edinet-fsa.go.jp/searchdocument/pdf/S100YBHC.pdf
  2. Harmonic Drive Systems Inc. Earnings briefing materials for the first quarter of the year to March 2027 (published 7 August 2026; in Japanese). The “consolidated sales by application (quarterly)” chart and the revision of the full-year forecast. Posted on the company’s investor relations page. https://contents.xj-storage.jp/xcontents/AS06879/b045fd4d/ec48/4539/8d39/4b66e7a74f0a/140120260807515115.pdf
  3. Harmonic Drive Systems Inc. Business domain and business model (company website, in Japanese; checked 25 October 2026). Product groups and the description of the strain wave gear (three parts, ratios of 1/30 to 1/320). https://www.hds.co.jp/company/business/model/
  4. Harmonic Drive Systems Inc. Joint development with industry, government and academia (company website, in Japanese; checked 25 October 2026). The case with the Ishikawa laboratory of the University of Tokyo and examples of partners. https://www.hds.co.jp/development/structure/university/
  5. Harmonic Drive Systems Inc. Core technologies (company website, in Japanese; checked 25 October 2026). Precision cutting, thin-walled metal parts, small-module gears and related processing. https://www.hds.co.jp/development/hd_skill/core/
  6. Harmonic Drive Systems Inc. Official logo file (logo_blue.png; source of the logo image; checked 25 October 2026). https://www.hds.co.jp/Portals/0/files/common/images/logo_blue.png

14. Claim-to-source audit

Claim in the textTypeSource
Legal name, head office, English name, move to the Prime Market (February 2026)SourcedReference 1 https://disclosure2dl.edinet-fsa.go.jp/searchdocument/pdf/S100YBHC.pdf
Consolidated sales, operating profit, ordinary profit and net profit or loss (FY2023 to FY2025)SourcedReference 1 https://disclosure2dl.edinet-fsa.go.jp/searchdocument/pdf/S100YBHC.pdf
Product groups (reducers 77.8%, mechatronics 22.2%) and sales and changes by regionSourcedReference 1 https://disclosure2dl.edinet-fsa.go.jp/searchdocument/pdf/S100YBHC.pdf
R&D ¥3,950 million, 151 R&D staff, capital expenditure ¥4,796 million, 1,419 employeesSourcedReference 1 https://disclosure2dl.edinet-fsa.go.jp/searchdocument/pdf/S100YBHC.pdf
The share of sales to industrial robots is not stated in the securities reportNot yet confirmedReference 1 Not stated in the report. This article does not estimate it from the report https://disclosure2dl.edinet-fsa.go.jp/searchdocument/pdf/S100YBHC.pdf
Reading of sales to industrial robots from the briefing chart and the share calculationOur calculationReference 2 Our own reading and calculation. The chart’s categories are the company’s classification https://contents.xj-storage.jp/xcontents/AS06879/b045fd4d/ec48/4539/8d39/4b66e7a74f0a/140120260807515115.pdf
Forecast for the year to March 2027 (sales of ¥74.5 billion; revised 7 August 2026)SourcedReference 2 The company’s forecast, not accomplished fact https://contents.xj-storage.jp/xcontents/AS06879/b045fd4d/ec48/4539/8d39/4b66e7a74f0a/140120260807515115.pdf
New medium-term plan (FY2026 to FY2030) targets and growth fields; revision of the old planSourcedReference 1 https://disclosure2dl.edinet-fsa.go.jp/searchdocument/pdf/S100YBHC.pdf
The company’s statement that AI robot adoption differs from assumptionsSourcedReference 1 https://disclosure2dl.edinet-fsa.go.jp/searchdocument/pdf/S100YBHC.pdf
Rise in North American AI robot orders and the 13% rise in North American capacitySourcedReference 1 https://disclosure2dl.edinet-fsa.go.jp/searchdocument/pdf/S100YBHC.pdf
Acquisition and full ownership of Harmonic Drive SE and LLC, stake in Ome Casting, historySourcedReference 1 https://disclosure2dl.edinet-fsa.go.jp/searchdocument/pdf/S100YBHC.pdf
Specifications of the strain wave gear and planetary reducers (three parts, 1/30 to 1/320, 1/3 to 1/45)SourcedReference 3 https://www.hds.co.jp/company/business/model/
Case with the Ishikawa laboratory of the University of Tokyo, partner examples, CSF-3SourcedReference 4 https://www.hds.co.jp/development/structure/university/
Core technologies (precision cutting, thin-walled metal parts, small-module gears and others)SourcedReference 5 https://www.hds.co.jp/development/hd_skill/core/
Risks (demand swings, build-to-order, European intangibles, financial covenants and others)SourcedReference 1 https://disclosure2dl.edinet-fsa.go.jp/searchdocument/pdf/S100YBHC.pdf
Customer names, shipment numbers, sales to AI and humanoid robots, public research fundingNot yet confirmedNot stated in the sources checked. This article does not guess
Support for the claims “high world share” and “world’s smallest”Not yet confirmedReference 1, 4 Company statements. No figures or third-party verification found https://disclosure2dl.edinet-fsa.go.jp/searchdocument/pdf/S100YBHC.pdf https://www.hds.co.jp/development/structure/university/
Reading: robot demand swings hit the company directlyInferenceReference 1, 2 Our own reading of the risk statements and our calculation https://disclosure2dl.edinet-fsa.go.jp/searchdocument/pdf/S100YBHC.pdf https://contents.xj-storage.jp/xcontents/AS06879/b045fd4d/ec48/4539/8d39/4b66e7a74f0a/140120260807515115.pdf
Reading: widening the pillars of sales beyond robotsInferenceReference 1 Our own reading of the growth fields in the new plan https://disclosure2dl.edinet-fsa.go.jp/searchdocument/pdf/S100YBHC.pdf
Reading: adding North American capacity for AI robot demandInferenceReference 1 Our own reading of the North American orders and capacity statements https://disclosure2dl.edinet-fsa.go.jp/searchdocument/pdf/S100YBHC.pdf
Company type (components & enabling software)Our calculationOur own grouping. Company names are examples from this series

Last updated 25 October 2026 / Troy Technical
Figures in this article come from Harmonic Drive Systems’ annual securities report (EDINET) and from earnings materials and pages on its website. No research-firm estimates or press-based figures have been used. Expressions such as “high world share” are company statements and have not been independently verified. Passages marked “Inference” are our own reading of primary sources, not statements by the company. This article is not investment or purchasing advice.

🌐 Japanese