Question: In which city was this global energy and commodity trading company larger than Trafigura as an oil trader formed?

Context paragraphs:
Gunvor (company): Gunvor Group Ltd is a global commodity trading company registered in Cyprus, with its main trading office in Geneva, Switzerland.  Gunvor also has trading offices in Singapore, the Bahamas, and Dubai, with a network of representative offices around the globe.  The company operates in the trade, transport, storage and optimization of petroleum and other energy products, as well as having investments in oil terminal and port facilities.  Its operations consist of securing crude oil upstream and delivering it to market via pipelines and tankers.

Mercuria Energy Group: Mercuria Energy Group Ltd is a privately held Swiss international commodity trading company active over a wide spectrum of global energy markets including crude oil and refined petroleum products, natural gas (including LNG), power, coal, biodiesel, carbon emissions, base metals and agricultural products.  In 2014, the company bought the commodities trading arm of J.P. Morgan in a reported US$800 million deal.

Brady plc: Brady plc is a software company providing commodity solutions to producers, consumers, financial institutions and trading companies.  It is the largest European provider of Commodity Trading and Risk Management (CTRM) solutions that are similarly offered by American competitors such as Triple Point Technology.  In addition to major financial institutions, Brady plc's clients include major commodity traders such as Koch Supply & Trading, Glencore, Norsk Hydro Trafigura, Xstrata Copper and Louis Dreyfus Commodities Suisse SA.

Trafigura: Trafigura Pte Ltd is a Singaporean multinational commodity trading company founded in 1993 that trades in base metals and energy, including oil.  It is the world's second largest private oil trader after Vitol and the world's largest private metals trader.

Vitol: The Vitol Group is a global energy and commodity trading company that was founded in Rotterdam in 1966 by Henk Viëtor and Jacques Detiger.  Though physical trading, logistics and distribution are at the core of the business,

Glencore: Glencore plc (an acronym for Global Energy Commodity Resources) is an Anglo–Swiss multinational commodity trading and mining company with headquarters in Baar, Switzerland, and a registered office in Saint Helier, Jersey.  The current company was created through a merger of Glencore with Xstrata on 2 May 2013.  s of 2015 , it ranked tenth in the Fortune Global 500 list of the world's largest companies.  It is the world's third-largest family business.

Commodity trading in India: Commodity trading in India has a long history.  In fact, commodity trading in India started much before it started in many other countries.  However, years of foreign rule, droughts and periods of scarcity and Government policies caused the commodity trading in India to diminish.  Commodity trading was, however, restarted in India recently.  Today, apart from numerous regional exchanges, India has six national commodity exchanges namely, Multi Commodity Exchange (MCX), National Commodity and Derivatives Exchange (NCDEX), National Multi-Commodity Exchange (NMCE) and Indian Commodity Exchange (ICEX), the ACE Derivatives exchange ( ACE )and the Universal commodity exchange (UCX).  The regulatory body is Forward Markets Commission (FMC) which was set up in 1953.  As of September 2015 FMC is merged with the Securities and Exchange Board of India, SEBI.

Claude Dauphin (businessman): Claude Dauphin (10 June 1951 – 30 September 2015) was a French billionaire businessman and executive chairman of Trafigura Beheer BV, a company specialising in commodity trading (oil, metals, ores).  In addition to being one of the company's founding partners, Dauphin had previously served as Trafigura's chairman and CEO.  In March 2013 his net wealth was estimated at $1 billion by "Forbes".  Dauphin died from cancer in a hospital in a Bogota, Colombia hospital at the age of 64 after a two-year struggle with lung cancer.

Claude Wilfrid Etoka: Claude Wilfrid Etoka (aka Willy Etoka) (born 30 May 1969, in Brazzaville, Congo) is the congolese nominee of the son of the Congolese president Kiki Sassou-Nguesso, CEO of Oil Trading company SARPD Oil and Oil palm production company Eco Oil Energy .  Etoka was listed by Forbes Africa as the 10th richest man of Africa, with a wealth estimated at 500 M$.  His company facilitates the supply of 60% of the Congolese fuel market, In "Jeune Afrique" (11 May 2015), Etoka featured as one of the well-connected ‘Golden Boys’; new African traders breaking through in the oil markets traditionally dominated by the international oil giants which are controlled and owned by Europeans (Glencore, Trafigura, Vitol, Mercuria, Oryx Energy).  Within 10 years, his company SARPD Oil is ranked as the fifth oil player in Africa in terms of trading.

Commodity pool operator: A Commodity pool operator (CPO) is an individual or organization that solicits or receives funds to use in the operation of a commodity pool, syndicate, investment trust, or other similar fund, specifically for trading in commodity interests.  Such interests include commodity futures, swaps, options and/or leverage transactions.  A commodity pool may refer to funds that trade in commodities and can include hedge funds.  A CPO may make trading decisions for a fund or the fund can be managed by one or more independent commodity trading advisors.  The definition of CPO may apply to investment advisors for hedge funds and private funds including mutual funds and exchange-traded funds in certain cases.  CPOs are generally regulated by the United States federal government through the Commodity Futures Trading Commission and National Futures Association.

Supporting paragraphs: Trafigura Vitol
Answer: Rotterdam