Thomasnet: From the Big Green Books to the Digital Sourcing Marketplace
Thomasnet, formally Thomas and formerly the Thomas Register of American Manufacturers, is an industrial sourcing and information platform based in New York. At thomasnet.com, engineers, procurement professionals and business owners search for suppliers, products and services, while manufacturers and distributors use the platform to be found, to publish catalogues and specifications and to generate sales leads. Few American business information brands have a longer continuous history: the company was founded in 1898 and spent more than a century as industry's best-known printed buying guide before moving entirely online and, in 2021, being acquired by the manufacturing marketplace company Xometry.
The batch description for this profile calls Thomasnet an industrial sourcing and information platform from Thomas Publishing that provides supplier discovery and industry news content. That is accurate but understated. Thomasnet is also a news and insights publisher for manufacturing, a marketing services provider for suppliers and the digital successor to a reference work once described as the purchasing bible of American industry.
Overview
Thomasnet's platform connects two audiences. Buyers use it to find exact products, components, raw materials and custom manufacturing services, to compare supplier capabilities and certifications and to issue requests for information or quotation. Suppliers use it to present detailed company and product information to buyers who are actively sourcing. At the time of its acquisition by Xometry, Thomas reported more than 1.3 million registered users and more than 500,000 commercial and industrial sellers on Thomasnet.com, with more than 20 million sourcing sessions started on the platform.
The platform's content goes well beyond listings. Supplier profiles carry capabilities, product catalogues, CAD drawings and specification data. Editorial content, historically delivered through product news magazines and now through online industry news and insights, helps buyers understand technologies and supplier developments. For suppliers, Thomas sells marketing and data services intended to convert buyer attention into enquiries, making the business a hybrid of directory, marketplace, trade publisher and digital marketing agency.
History and Founding
Thomas was founded in 1898 by Harvey Mark Thomas, whose first property was Hardware and Kindred Trades. His insight, as company histories summarise it, was that American business needed accurate, up-to-date sourcing information: who makes a given product, where they are and what they can supply. The early twentieth-century successor, Thomas' Register of American Manufacturers, appeared in the 1905 to 1914 period in different accounts of its first editions and grew into the Thomas Register, the multi-volume buying guide familiar to generations of purchasing departments.
At its height the Thomas Register of American Manufacturers was a three-section buying guide running to more than thirty volumes, offering sourcing information, specifications and product details from thousands of manufacturers. Its green bindings gave it its nickname, the Big Green Books, and its authority gave it another: the purchasing bible. Thomas Publishing remained privately owned for more than a century, surviving two world wars, the Great Depression and repeated industrial cycles while expanding into regional directories and product news publishing. The Thomas Regional Directory division began in 1976, producing regional industrial buying guides in print and later on CD-ROM across 19 regional editions.
The Move Online and the End of Print
Thomas began putting its directories online in the mid-1990s, as the web changed how engineers searched. The company announced in 2005 that print would end after the 2006 edition. Following that edition, described in company and trade reporting as the register's 100th and final print edition, Thomas ceased publishing the Thomas Register and the regional buying guides in print and made the full information available free of charge at ThomasNet.com.
The transition changed the product's economics and its usefulness. A printed register was revised annually and consulted in a purchasing office; an online platform could be searched continuously, updated as suppliers changed and enriched with catalogues, CAD models, certifications and news. Thomas relaunched its sourcing platform with applications for product sourcing across more than 100 million items, custom quotes routed through its engineering team, supplier diversity search, certification search covering dozens of credential types, industry news and a jobs board. The Big Green Books became a database, and the database became Thomasnet.
Ownership and Leadership
For most of its life Thomas was owned by Thomas Publishing Company, the privately held New York publisher founded by Harvey Mark Thomas. That changed on 8 December 2021, when Xometry, the global marketplace for on-demand manufacturing, announced its acquisition of Thomas in a cash and stock transaction valued at 300 million dollars, expected to close that week. Advisory firm DC Advisory confirmed it had advised Thomas Publishing on the sale, following a process that began with discussions about a strategic combination and a formal letter of intent from Xometry in early October 2021.
Leadership at the transition joined the two companies' chief executives. Tony Uphoff, then president and chief executive officer of Thomas, presented the deal as uniting Thomas's buyer and seller relationships, data and marketing services with the power of Xometry's marketplace. Randy Altschuler, chief executive of Xometry, said the companies shared a mission of championing the digital transformation of manufacturing and praised Thomas's brand equity, trusted relationships, proprietary data and full-funnel marketing services. Thomas now operates as part of Xometry, ending more than 120 years as an independent, family-founded publishing business while keeping the Thomas name and platform in use.
Services and Distribution
Supplier discovery is Thomasnet's headline service. Buyers search by product, service, company or capability, filter by location and credentials and open detailed supplier profiles. Supporting tools documented in the platform's relaunch include product selectors that step first-time buyers through specifications, a custom quotes service using structured request-for-quotation forms for machining, welding, cutting, finishing and fabrication work, a diversity application covering minority-owned, woman-owned, veteran-owned and other disadvantaged businesses with downloadable ownership certificates, and a certification application spanning credentials such as ISO, ANSI, Nadcap, ITAR and FDA registrations.
For suppliers, Thomasnet distributes much more than a listing. Suppliers publish online catalogues, line-item product details and CAD drawings, receive qualified industrial traffic and use marketing programmes and analytics products, historically including tools referred to as WebTrax and Navigator, to turn visits into leads. Thomas also distributes editorial and commercial content: supplier news, press releases, product announcements and industry coverage that keep profiles visible in search and give buyers context about technologies and markets. Free basic listings sit alongside paid marketing services, a model carried over from the paid-enhancement logic of the print register.
Coverage Areas and Users
Thomasnet serves the United States and Canada as its core sourcing territory, with a worldwide audience of industrial buyers. Its registered user base at acquisition exceeded 1.3 million, and contemporary reporting on the Xometry deal noted the platform's particular strength among engineers and buyers at large companies. Its supplier network of more than 500,000 commercial and industrial companies spans original equipment manufacturers, distributors, maintenance and repair providers and custom manufacturers across virtually every industrial category, from raw materials and components to finished products and business services.
Geography remains built into the product, as it was in the regional print era. Buyers can source nationally or look for nearby suppliers to shorten lead times and transport costs, while suppliers can target the regions they serve. That local-to-national structure is a direct inheritance from the Thomas Regional guides, translated from 19 print editions into searchable filters.
Digital Platforms and Industry News
Thomasnet.com is the company's single digital home, combining the supplier database, sourcing applications, supplier marketing services and editorial publishing. Its industry news and insights operation, delivered in recent years under the Thomas Insights banner, publishes manufacturing news, analysis, explainers and supplier developments aimed at the same engineers and procurement readers who use the sourcing tools. That editorial layer matters for an information platform: it brings readers back between purchases, surfaces new suppliers and technologies and reinforces Thomas's claim to be an authority on industrial markets rather than only a directory.
The platform's technical offer to buyers includes structured product taxonomies, specification search across a catalogue measured at more than 100 million items in its relaunch description, downloadable CAD content and direct request tools that let a buyer contact one supplier or issue a one-to-many request for information. For a brand that began as a printed index in 1898, the continuity is striking: the job is still to make the right supplier findable at the moment of need, but the index is now interactive, measurable and updated continuously.
Notable Work and Industry Position
Thomasnet's most notable work is the Thomas Register itself. For roughly a century it was the standard first stop for American industrial sourcing, present in purchasing departments across the country and cited in trade literature as the bible of industry. Building and maintaining that register required an enormous continuing editorial operation: verifying manufacturers, classifying products into thousands of categories and publishing specifications accurately at national scale. That verified database, more than any single article or campaign, is the asset that made Thomas valuable to Xometry for 300 million dollars.
In the modern market Thomas competes with general search engines, specialist engineering platforms such as GlobalSpec and marketplace and data rivals in industrial e-commerce. Its defensible position rests on the same assets Xometry cited at acquisition: brand trust built over more than a century, proprietary supplier data, deep buyer relationships and marketing services that suppliers buy because buyers still begin sourcing sessions on Thomasnet in the tens of millions.
Recent Developments
The defining recent development is the Xometry acquisition and the integration that followed. Xometry said the purchase would rapidly expand its buyer and seller base, enhance its global digital marketplace and let it use Thomas's marketing and data services to offer end-to-end services for sellers, including additional financial technology and digital marketing products. Thomas's registered users and supplier network were folded into a wider strategy that included placing Xometry's quoting capabilities across third-party sites, extending the reach of both brands.
Thomasnet continues to operate under its own name from New York as Xometry's sourcing and supplier-discovery platform. Its story is one of the clearest examples in American media of a print reference institution surviving by becoming a platform: founded in 1898, printed for the last time in 2006, independent until 2021 and still, in digital form, performing the task Harvey Mark Thomas identified at the end of the nineteenth century, connecting the people who need industrial products with the companies that make and supply them.
