Willbros Group was a specialty energy infrastructure contractor that served the oil and gas, power, refining, petrochemical, and other industries before being acquired by Primoris Services Corporation.

Cloud Elements was a Denver-based API integration platform that offered pre-built connectors ("Elements") and category-level Unified APIs (CRM, Documents, Finance, Helpdesk, Messaging, etc.) so SaaS vendors could embed third-party integrations without building each connector from scratch.

SunGard Data Systems was a software and technology services company that provided software and processing solutions to financial services, education, and the public sector. In November 2015, SunGard was acquired by Fidelity National Information Services (FIS) for approximately $9.1 billion.

Genuity Inc. was an internet infrastructure services company spun off from GTE/BBN, which filed for bankruptcy in 2002 and had the majority of its assets acquired by Level 3 Communications. Level 3 was later acquired by CenturyLink in 2017, which rebranded as Lumen Technologies.

Hillshire Brands was a U.S.-based food company that produced and sold meat-centric food solutions including Jimmy Dean, Ball Park, Hillshire Farm, State Fair, and Sara Lee branded products. The company was acquired by Tyson Foods in 2014 and its operations have been integrated into the Tyson Foods organization.

Orbital ATK was an American aerospace manufacturer and defense industry company formed in February 2015 by the merger of Orbital Sciences Corporation and the defense and aerospace divisions of Alliant Techsystems.

Parkhub provided parking management and payment processing APIs for parking operators and venues. Parkhub has been acquired and the parkhub.com domain now redirects to JustPark Business. Public API documentation is no longer available.

Legg Mason was a global asset management firm offering investment products and services through a network of investment affiliates before being acquired by Franklin Resources (Franklin Templeton) in 2020.

Lorillard Tobacco Company was the third-largest cigarette manufacturer in the United States, marketing cigarettes under brand names including Newport, Kent, True, and Old Gold. In 2015, Lorillard was acquired by Reynolds American Inc.

Kansas City Southern (KCS) was a transportation holding company that operated freight rail networks across the United States and Mexico. On April 14, 2023, KCS merged with Canadian Pacific Railway to form Canadian Pacific Kansas City (CPKC), the first single-line rail network connecting Canada, the United States, and Mexico.

Dean Foods was a leading U.S. food and beverage company and one of the largest processors and direct-to-store distributors of fresh fluid milk and other dairy products. After filing for Chapter 11 bankruptcy in 2019, most of Dean Foods' assets were acquired by Dairy Farmers of America (DFA) in 2020.

Crestwood Equity Partners LP was a master limited partnership that owned and operated midstream energy assets across the United States, including natural gas, NGL, and crude oil gathering, processing, storage, and transportation businesses.

CH2M Hill was a global engineering, consulting, design, construction and operations firm providing services for corporations and federal, state, and local governments. Headquartered in Englewood, Colorado, the firm delivered work in water, transportation, environment, energy, industrial, and facilities markets.

CST Brands was an independent retailer of motor fuels and convenience merchandise headquartered in San Antonio, Texas, operating under the Corner Store and other brands. CST Brands was acquired by Alimentation Couche-Tard in 2017 and integrated into the Circle K convenience store network.

General Cable Corporation was a global developer and manufacturer of copper, aluminum, and fiber optic wire and cable products. The company was acquired by Prysmian Group in 2018 and integrated into the Prysmian portfolio. No public developer APIs are documented for General Cable.

Denbury Resources (now Denbury Inc.) was an independent oil and natural gas company focused on enhanced oil recovery (EOR) using carbon dioxide injection in mature oil fields. Denbury was acquired by ExxonMobil in November 2023 and operates as a subsidiary inside ExxonMobil's Low Carbon Solutions business.

Magellan Midstream Partners owned the longest refined petroleum products pipeline system in the United States, along with refined petroleum products and crude oil storage facilities.

Western Refining was an independent crude oil refiner and marketer of refined petroleum products headquartered in El Paso, Texas. The company operated refineries in El Paso, Texas; Gallup, New Mexico; and St. Paul Park, Minnesota before being acquired by Tesoro Corporation in 2017 for approximately $6.4 billion.

KapStone Paper and Packaging Corporation was a producer of containerboard, corrugated products, and specialty paper based in Northbrook, Illinois. In November 2018, KapStone was acquired by WestRock for approximately $4.9 billion, ending its existence as an independent public company.

Big Heart Pet Brands was a producer and marketer of branded pet food and snacks with brands including Meow Mix, Milk-Bone, Kibbles 'n Bits, 9Lives, Natural Balance, Pup-Peroni, Gravy Train, Nature's Recipe, Canine Carry Outs, and Milo's Kitchen. Big Heart Pet Brands was acquired by The J.M.