Amber Enterprises is India’s largest outsourced manufacturer of room air conditioners and a rapidly diversifying industrial group - it builds the machines and the components inside them for the brands you see in shops, then collects a manufacturing margin rather than a brand premium. Founded in 1990 in Punjab and listed in 2018, it started as a pure AC assembly shop and has since transformed into a three-division B2B solutions provider spanning consumer durables, electronics, and railway subsystems. The recurring approach is visible across every division: buy or build deep backward integration so you can supply more of the bill of materials to the same customer, then use the cash flows from one engine to fund the next.
Business segments
Three engines at different stages - a consumer-durables cash cow built on AC manufacturing, a fast-growing electronics platform stitching together PCB and assembly acquisitions, and a niche railway-subsystems leader with a multi-year order book - each expanding its share of the customer’s bill of materials.
1. Consumer durables: the AC factory behind India’s cooling brands
Amber makes roughly one in every four room air conditioners sold in India, and supplies about 70% of the bill of materials that goes into each unit - it is the industry’s outsourced manufacturing backbone.
- Assembles complete ACs for brands - the division manufactures finished room air conditioners (window and split units, from 0.75 ton to 2 tons, across 2-star to 5-star energy ratings and inverter ranges) as well as commercial ACs like cassette, tower and ductable units, all sold under its customers’ brand names.
- Supplies the guts, not just the shell - it makes the critical functional components that go inside an AC: heat exchangers, multi-flow condensers, sheet metal parts, system tubing, motors, printed circuit board assemblies, injection-moulded plastics, copper tubes, cross-flow fans and compressor mufflers, covering roughly 70% of a typical RAC’s bill of materials.
- Followed the customer when the model changed - as leading AC brands moved assembly in-house, Amber pivoted from being primarily a finished-goods assembler to a components supplier for those same customers, keeping its share of the RAC value chain at about 27% by value. Room AC finished goods fell from 72% of divisional revenue in FY18 to 47% by FY26, while components and non-AC finished goods filled the gap.
- Spreads fixed costs across 24 plants - the division runs 24 manufacturing facilities located near customer clusters across India, offering just-in-time delivery; it also supplies components beyond ACs, including refrigerator case liners, washing machine tub assemblies, microwave parts, and sheet metal for automobiles.
- Adding washing machines and mobile phones - a wholly owned subsidiary now makes fully automatic top-load and front-load washing machines, and in June 2026 the group signed a manufacturing agreement with Oppo to produce mobile phones for the OPPO, OnePlus and Realme brands, marking an entry into consumer electronics assembly.
2. Electronics: a PCB and assembly platform stitched together by acquisition
The division has been assembled through a series of acquisitions to create a vertically integrated electronics manufacturer - it makes the bare printed circuit boards, assembles components onto them, and builds finished electronic boxes, all under one roof.
- Starts with the bare board - through Ascent Circuits and Shogini Technoarts, the division manufactures single-sided, double-sided, multilayer and radio-frequency PCBs up to 48 layers, serving customers like ISRO, BHEL and BEL as well as automotive and telecom clients. A new multilayer PCB plant in Hosur is expected to begin trial production by late 2026.
- Assembles PCBs for everything from ACs to cars - ILJIN Electronics and EVER Electronics populate bare boards with components to create PCB assemblies for inverter ACs, microwaves, refrigerators, televisions, smart watches, two-wheeler and four-wheeler automobiles, smart energy meters, and 4G/5G telecom equipment.
- Builds complete electronic products - the division does “box build” - assembling finished electronic devices, not just the boards inside them - for hearables and wearables (through Stelltek Technologies, originally a joint venture with the Noise brand), as well as solar inverters, UPS systems, EV chargers and battery energy storage systems (through Power-One Micro Systems).
- Betting on advanced PCBs and semiconductor substrates - a joint venture between ILJIN and Korea Circuit, called Ascent-K Circuit, is building a ₹3,200 crore facility on 16 acres near Jewar Airport to manufacture HDI, flex and semiconductor-substrate PCBs, targeting mobile and semiconductor industries; the project is approved under the government’s Electronics Component Manufacturing Scheme.
- Expanding into industrial automation and IoT - a majority stake in Israel-based Unitronics adds programmable logic controllers and human-machine interfaces for factory automation, while a minority stake in MoMagic Wireless brings wireless communication module design for Internet-of-Things applications.
3. Railway subsystems and mobility: a niche supplier with a multi-year order book
Sidwal, the division’s core subsidiary, has supplied over 20,000 air-conditioning units for Indian trains and metros - and is now adding doors, gangways, couplers and brakes to sell more than ₹1 crore of equipment per passenger coach.
- Owns the HVAC slot on India’s trains - Sidwal pioneered the indigenous roof-mounted air conditioner for rail coaches in 1991 and today supplies HVAC systems for mainline coaches, metro coaches, and high-speed trains including Vande Bharat, Tejas and the Namo Bharat regional rapid transit system.
- Sells more systems per train than before - the division has expanded beyond air conditioning into automated doors, inter-car gangways and pantry systems, raising its addressable content per passenger car to approximately ₹1.1 crore. It won first orders for doors and gangways worth ₹515 crore from three new customers in FY24.
- Adding the underframe kit through a Korean joint venture - a JV with Yujin Machinery of South Korea will manufacture driving gears, couplers, pantographs and brakes; the factory is ready and commercial production is expected in the second half of FY27, pending regulatory approval.
- Order book stretches years ahead - the division holds an order book of over ₹2,600 crores, giving it visibility well beyond the current year; railway contracts are fixed-price, while metro contracts pass cost changes through to the customer.
- Also cools data centres and defence shelters - beyond rolling stock, Sidwal makes precision HVAC for steel plants and data centres, bus air conditioning, and specialised air conditioners for defence shelters and vehicles, where the defence order book grew at a double-digit rate in FY24.
Group structure and partners
Amber operates through a web of wholly owned and majority-controlled subsidiaries, each adding a specific manufacturing capability - motors, fans, PCBs, power electronics, train doors - that feeds into the three divisions.
- Consumer durables is fed by captive component makers - PICL makes over 200 models of induction motors for HVAC systems; AmberPR Technoplast makes cross-flow fans and plastic parts (and is being merged into the parent); Pravartaka Tooling makes injection moulds and moulded components for consumer durables and automotive customers.
- Electronics is a chain of acquisitions under ILJIN - ILJIN Electronics, the material subsidiary, holds the stakes in Ascent Circuits (PCBs, now at 98.5%), Shogini Technoarts (bare PCBs), Stelltek Technologies (wearables), Power-One Micro Systems (power electronics), Unitronics (industrial automation, via an Israeli holding company), and the newly incorporated ILJIN Technologies for medical and defence electronics.
- Railway sits inside Sidwal - Sidwal Refrigeration Industries is the wholly owned platform for rail, metro, bus and defence HVAC; its subsidiary AT Railway Sub Systems houses the Yujin Machinery JV for couplers, gears, pantographs and brakes.
- Global partnerships fill technology gaps - a strategic alliance with Sumitronics of Japan targets Japanese EMS customers in India; a cooperation with Germany’s Schweizer Electronic brings automotive and industrial PCB know-how to Ascent Circuits; and the Korea Circuit JV brings four decades of advanced PCB production experience.