Question: In January 2016  Precision Castparts Corp. became a sibsidiary of a multinational conglomerate holding company headquartered where?

Context paragraphs:
Mahindra Group: The Mahindra Group is an Indian multinational conglomerate holding company headquartered at Mahindra Towers in Mumbai, India, with operations in over 100 countries around the globe.  The group has a presence in aerospace, agribusiness, aftermarket, automotive, components, construction equipment, defence, energy, farm equipment, finance and insurance, industrial equipment, information technology, leisure and hospitality, logistics, real estate, retail, and two wheelers.  It is considered to be one of the most reputable Indian industrial houses with market leadership in utility vehicles as well as tractors in India.

Tata Group: Tata Group is an Indian multinational conglomerate holding company headquartered in Mumbai, Maharashtra, India.  It was founded in 1868 by Jamsetji Tata and gained international recognition after purchasing several global companies.  It is India's largest conglomerate and is owned by "Tata Sons", a charity registered with the Charity commissioner in India.

Berkshire Hathaway: Berkshire Hathaway Inc. is an American multinational conglomerate holding company headquartered in Omaha, Nebraska, United States.  The company wholly owns GEICO, Long & Foster, BNSF Railway, Lubrizol, Fruit of the Loom, Helzberg Diamonds, FlightSafety International, Pampered Chef, and NetJets, and also owns 26.7% of the Kraft Heinz Company, and significant minority holdings in American Express (17.15%), The Coca-Cola Company (9.4%), Wells Fargo (9.9%), IBM (6.9%) and Apple (2.5%).  Since 2016, the company has acquired large holdings in the major US airline carriers and is currently the largest shareholder in United Airlines and Delta Air Lines and a top 3 shareholder in Southwest Airlines and American Airlines.  Berkshire Hathaway has averaged an annual growth in book value of 19.0% to its shareholders since 1965 (compared to 9.7% from the S&P 500 with dividends included for the same period), while employing large amounts of capital, and minimal debt.

Precision Castparts Corp.: Precision Castparts Corp. is an American industrial goods and metal fabrication company that manufactures investment castings, forged components, and airfoil castings for use in the aerospace, industrial gas turbine, and defense industries.  In 2009 it ranked 362nd on the Fortune 500 list, and 11th in the aerospace and defense industry.  In 2015 it ranked 322nd overall and 9th in the aerospace and defense industry.  In 2014 it ranked 133rd on the S&P 500 based on market capitalization.  In January 2016, the company became a subsidiary of Berkshire Hathaway.  Before that event, it used to be one of the three Fortune 500 companies headquartered in Oregon.

Lester Lyles: General Lester L. Lyles (born April 20, 1946) is a former United States Air Force general, Vice Chief of Staff of the United States Air Force, and Commander, Air Force Materiel Command, Wright-Patterson Air Force Base, Ohio.  After retirement from the Air Force in 2003, he became a company director for General Dynamics, DPL Inc., KBR Incorporated, Precision Castparts Corp., MTC Technologies, Battelle Memorial Institute and USAA.  Lyles is also a Trustee of Analytic Services and a Managing Partner of Four Seasons Ventures, LLC.

Titanium Metals Corporation: Titanium Metals Corporation, founded in 1950, is an American manufacturer of titanium-based metals products, focusing primarily on the aerospace industry.  In November 2012, it was announced the company was being purchased for $2.9 billion by Precision Castparts Corp.

Shannon Free Zone: Shannon Free Zone is a 2.43 km2 , international business park adjacent to Shannon Airport, County Clare, Ireland which is 18 km from Ennis and 20 km from Limerick.  Businesses based on the site enjoyed special tax incentives on staff and profits until 2003.  This attracted a large number of multinational companies.  Currently there are over 100 international firms and 6,500 people employed at Shannon Free Zone in a diverse range of activities.  Companies who have invested at Shannon include Avocent, DeBeers Industrial Diamonds (Now Element Six), Kraus & Naimer, GE Capital, Precision Castparts Corp., Genworth, Ingersoll Rand, Intel, John Crane, Lufthansa Technik, Mentor Graphics, Molex, Illinois Tool Works, RSA Security, Ohshima, Schwarz Pharma and Zimmer.

Beximco: The Bangladesh Export Import Company Limited, commonly known by its trade name BEXIMCO (DSE: BEXIMCO CSE: BEXIMCO), is a Multinational Conglomerate holding company headquartered in Dhaka, Bangladesh.  It was founded in 1953.  Beximco is Bangladesh's largest conglomerate, with the largest market capitalisation on the country's stock market.  BEXIMCO's subsidiaries export products to 103 countries worldwide.  It has retail outlets in South Asia and Eastern Europe.

Griffon Corporation: Griffon Corporation is a multinational conglomerate holding company headquartered in New York City.  The company's four subsidiaries are: The AMES Companies, Clopay Building Products, Clopay Plastic Products, and Telephonics Corporation.  In 2015, Griffon generated over $2 billion in sales with approximately 6,000 employees worldwide.  Griffon has been publicly traded since 1961 and is listed on the New York Stock Exchange as a component stock of the S&P SmallCap 600, S&P Composite 1500, and Russell 2000 indices.

Wyman-Gordon: Wyman-Gordon is a company that designs and manufactures complex metal components.  Founded in 1883 as a manufacturer of crankshafts for looms, it has a long history of making forged metal components, particularly for the aerospace industry.  Wyman-Gordon is now a subsidiary of Precision Castparts Corp., and is based in Houston, Texas.  It has 13 plants in five countries, and employed about 2,500 people as of 2012.

Supporting paragraphs: Precision Castparts Corp. Berkshire Hathaway
Answer: Omaha, Nebraska, United States