Rolex SA and its subsidiary Montres Tudor SA design, manufacture, distribute and service wristwatches sold under the Rolex and Tudor brands. Founded by Hans Wilsdorf and Alfred Davis in London, England in 1905 as Wilsdorf and Davis, Rolex moved its base of operations to Geneva, Switzerland in 1919.
Forbes ranked Rolex No.72 on its 2014 list of the world's most powerful global brands. Rolex is the largest single luxury watch brand, producing about 2,000 watches per day, with estimated 2012 revenues of US$7.7 billion.
The company is owned by the Hans Wilsdorf Foundation, a family private trust which does not pay corporate tax.
Alfred Davis and his brother-in-law Hans Wilsdorf founded Wilsdorf and Davis, the company that would eventually become Rolex SA, in London, England in 1905. Wilsdorf and Davis' main commercial activity at the time involved importing Hermann Aegler's Swiss movements to England and placing them in high-quality watch cases made by Dennison and others. These early wristwatches were sold to jewellers, who then put their own names on the dial. The earliest watches from Wilsdorf and Davis were usually hallmarked "W&D" inside the caseback.
In 1908 Wilsdorf registered the trademark "Rolex" and opened an office in La Chaux-de-Fonds, Switzerland. The company name "Rolex" was registered on 15 November 1915. The book The Best of Time: Rolex Wristwatches: An Unauthorized History by Jeffrey P. Hess and James Dowling says that the name was just made up. One story, never confirmed by Wilsdorf, recounts that the name came from the French phrase horlogerie exquise, meaning "exquisite clockwork" or as a contraction of "horological excellence". Wilsdorf was said to want his watch brand's name to be easily pronounceable in any language. He also thought that the name "Rolex" was onomatopoeic, sounding like a watch being wound. It is easily pronounceable in many languages and, as all its upper-case letters have the same size, can be written symmetrically. It was also short enough to fit on the face of a watch.
In 1919 Wilsdorf left England due to wartime taxes levied on luxury imports as well as to export duties on the silver and gold used for the watch cases driving costs too high and moved the company to Geneva, Switzerland, where it was established as the Rolex Watch Company. Its name was later changed to Montres Rolex, SA and finally Rolex, SA. Upon the death of his wife in 1944, Wilsdorf established the Hans Wilsdorf Foundation, a private trust, in which he left all of his Rolex shares, making sure that some of the company's income would go to charity. Wilsdorf died in 1960; since then, the trust has owned and run the company.
In December 2008, following the abrupt departure of Chief Executive Patrick Heiniger for "personal reasons", the company denied that it had lost 1 billion Swiss francs (approx £574 million, $900 million) invested with Bernard Madoff, the American asset manager who pleaded guilty to an approximately £30 billion worldwide Ponzi scheme fraud. Rolex SA announced Heiniger's death on 5 March 2013.
Among the company's innovations are:
- The first waterproof wristwatch "Oyster", 1926
- The first wristwatch with an automatically changing date on the dial (Rolex Datejust ref.4467, 1945)
- The first wristwatch case waterproof to 100 m (330 ft) (Rolex Oyster Perpetual Submariner ref.6204, 1953)
- The first wristwatch to show two time zones at once (Rolex GMT Master ref.6542, 1954)
- The first wristwatch with an automatically changing day and date on the dial (Rolex Day-Date, 1956)
- The first watchmaker to earn chronometer certification for a wristwatch (1910) 
The first self-winding Rolex wristwatch was offered to the public in 1931 (so-called the "bubbleback" due to the large caseback), preceded to the market by Harwood which patented the design in 1923 and produced the first self-winding watch in 1928, powered by an internal mechanism that used the movement of the wearer's arm. This not only made watch-winding unnecessary, but kept the power from the mainspring more consistent resulting in more reliable time keeping.
Rolex participated in the development of the original quartz watch movements. Although Rolex has made very few quartz models for its Oyster line, the company's engineers were instrumental in design and implementation of the technology during the late 1960s and early 1970s. In 1968, Rolex collaborated with a consortium of 16 Swiss watch manufacturers to develop the Beta 21 quartz movement used in their Rolex Quartz Date 5100. alongside other manufactures including the Omega Electroquartz watches. Within about five years of research, design, and development, Rolex created the "clean-slate" 5035/5055 movement that would eventually power the Rolex Oysterquartz.
Rolex was also the first watch company to create a water resistant wristwatch that could withstand pressure to a depth of 100 m (330 ft). Wilsdorf even had a specially made Rolex watch (the watch was called the "DeepSea") attached to the side of Trieste, which went to the bottom of the Mariana Trench. The watch survived and tested as having kept perfect time during its descent and ascent. This was confirmed by a telegram sent to Rolex the following day saying "Am happy to confirm that even at 11,000 metres your watch is as precise as on the surface. Best regards, Jacques Piccard".
Rolex produced specific models suitable for the extremes of deep-sea diving, caving, mountain climbing, polar exploration, and aviation. Early sports models included the Rolex Submariner (1953) and the Rolex Oyster Perpetual Date Sea Dweller. The latter watch has a helium release valve, co-invented with Swiss watchmaker Doxa, to release helium gas build-up during decompression. The Explorer (1953) and Explorer II (1971) were developed specifically for explorers who would navigate rough terrain, such as the world famous Mount Everest expeditions. Another iconic model is the Rolex GMT Master (1954), originally developed at the request of Pan Am Airways to provide its crews with a dual time watch that could be used to display GMT (Greenwich Mean Time), which was the international time standard for aviation at that time and was needed for Astronavigation during longer flights.
Rolex is the largest manufacturer of Swiss made certified chronometers. In 2005, more than half the annual production of COSC certified watches were Rolexes. To date, Rolex still holds the record for the most certified chronometer movements in the category of wristwatches.
The company is now starting to introduce ceramic bezels across the range of professional sports watches. They are available on the Submariner, Sea Dweller-Deepsea, GMT Master II and Daytona models. The ceramic bezel is not influenced by UV-light and is very scratch resistant.
Rolex SA offers products under the Rolex and Tudor brands.
Montres Tudor SA has designed, manufactured and marketed Tudor watches since 6 March 1946. Rolex founder Hans Wildorf conceived of the Tudor Watch Company to create a product for authorized Rolex dealers to sell that offered the reliability and dependability of a Rolex, but at a lower price.
Tudor watches are manufactured by Montres Tudor SA using movements supplied by ETA SA. They are marketed and sold in most countries around the world including the United States, Australia, Canada, India, Mexico, South Africa, many countries in Europe, South Asia, the Middle East and countries in South America, particularly Brazil, Argentina and Venezuela.
Rolex watch models
Rolex has three watch lines: Oyster Perpetual, Professional and Cellini (the Cellini line is Rolex's line of 'dressy' watches). The primary bracelets for the Oyster line are named Jubilee, Oyster and President.
The name of the watch lines in catalogs is often "Rolex Oyster Perpetual ______" or "Rolex ______"; Rolex Oyster and Oyster Perpetual are generic names and not specific product lines, except for the 36mm Oyster Perpetual model. The Air-King is the least expensive Oyster Perpetual watch. The Date is related to the Air-King but adds a date display. Certain models from the Date and Datejust are almost identical, however the Datejust has a 36mm case and a 20mm bracelet compared to the Date's 34mm case and 19mm bracelet. Modern versions of the Oyster Perpetual Date and Datejust models share Rolex's 3135 movement, with the most recent change to the 3135 movement being the introduction of Rolex's "parachrom bleu" hairspring, which provides increased accuracy. As the Date and Datejust share a movement, both have the ability to adjust the date forward one day at a time without adjusting the time; this feature is not confined to the Datejust. The Datejust is available in a wider range of metals and has a greater range of dials available.
Notable models include:
- GMT Master II
- Sea Dweller
- Yacht-Master II
In the UK, the retail price for the stainless steel 'Pilots' range (such as the GMT Master II) starts from GBP £5,600. Diamond inlay watches are more expensive. The book "Vintage Wristwatches" by Antiques Roadshow's Reyne Haines listed a price estimate of Rolex watches that ranged between $650 and $75,000, while listing Tudors between $250 and $9,000. The most expensive Rolex ever produced by the Rolex factory was the GMT Ice reference 116769TBR with a retail price of $485,350. A Forbes magazine article on the Swiss watch industry compared the retail value of Rolexes to that of competing brands Corum, Universal Genève and IWC.
In tennis, Rolex is the official time keeper of Wimbledon and the Australian Open, two of the four Grand Slams. In golf, it is the official time keeper for two of the four majors, The Open Championship and the U.S. Open; the presenting sponsor for one of the five senior majors, The Senior Open Championship; and the official sponsor of the Women's World Golf Rankings. They are also the title sponsor to the 24 Hours of Daytona, from which the Daytona model takes its name, along with the Rolex Sports Car Series. In 2013, Rolex became the official timekeeper to the FIA Formula 1 motor racing championship. Rolex has also been the official timekeeper to the Le Mans 24 Hours motor race since 2001.
Jacques Piccard and Don Walsh had a specially designed experimental Rolex Oyster Perpetual Deep-Sea Special strapped to the outside of their bathyscaphe during the 1960 Challenger Deep / Mariana Trench dive to a world-record depth of 10,916 metres (35,814 ft). When James Cameron conducted a similar dive in 2012, a specially designed and manufactured Rolex Oyster Perpetual Sea-Dweller Deep Sea Challenge watch was being "worn" by his submarine's robotic arm.
Ex-Formula 1 driver Sir Jackie Stewart has advertised Rolex since 1968. Others who have done so for some years include Arnold Palmer, Roger Penske, Jean Claude Killy and Dame Kiri Te Kanawa 
Tenzing Norgay and other members of the Hillary expedition wore Rolex Oysters in 1953 at altitude 8,848 m on Mount Everest while there are attestations and speculation that Sir Edmund Hillary either carried a Smiths Deluxe or a Rolex to the summit, or both.
Mercedes Gleitze was the first British woman to swim the English Channel on 7 October 1927. However, as John E. Brozek (author of The Rolex Report: An Unauthorized Reference Book for the Rolex Enthusiast) points out in his article "The Vindication Swim, Mercedes Gleitze and Rolex take the plunge", some doubts were cast on her achievement when a hoaxer claimed to have made a faster swim only four days later. Hence Gleitze attempted a repeat swim with extensive publicity on 21 October, dubbed the "Vindication Swim". For promotional purposes, Hans Wilsdorf offered her one of the earliest Rolex Oysters if she would wear it during the attempt. After more than 10 hours, in water that was much colder than during her first swim, she was pulled from the sea semi-conscious seven miles short of her goal. Although she did not complete the second crossing, a journalist for The Times wrote "Having regard to the general conditions, the endurance of Miss Gleitze surprised the doctors, journalists and experts who were present, for it seemed unlikely that she would be able to withstand the cold for so long. It was a good performance". As she sat in the boat, the same journalist made a discovery and reported it as follows: "Hanging round her neck by a ribbon on this swim, Miss Gleitze carried a small gold watch, which was found this evening to have kept good time throughout". When examined closely, the watch was found to be dry inside and in perfect condition. One month later, on 24 November 1927, Wilsdorf launched the Rolex Oyster watch in the United Kingdom with a full front page Rolex advert in the Daily Mail. The Vienna Herald described the 1969 Apollo moon landing as: 'an event almost as significant as the time a woman swam most of the English Channel with a waterproof watch on.'
Watches for POWs and help in the Great Escape
By the start of World War II Royal Air Force pilots were buying Rolex watches to replace their inferior standard-issue watches. However, when captured and sent to POW camps, their watches were confiscated. When Hans Wilsdorf heard of this, he offered to replace all watches that had been confiscated and not require payment until the end of the war, if the officers would write to Rolex and explain the circumstances of their loss and where they were being held. Wilsdorf was in personal charge of the scheme. As a result of this, an estimated 3,000 Rolex watches were ordered by British officers in the Oflag (prison camp for officers) VII B POW camp in Bavaria alone. This had the effect of raising the morale among the allied POWs because it indicated that Wilsdorf did not believe that the Axis powers would win the war. American servicemen heard about this when stationed in Europe during WWII and this helped open up the American market to Rolex after the war.
On 10 March 1943, while still a prisoner of war, Corporal Clive James Nutting, one of the organizers of the Great Escape, ordered a stainless steel Rolex Oyster 3525 Chronograph (valued at a current equivalent of £1,200) by mail directly from Hans Wilsdorf in Geneva, intending to pay for it with money he saved working as a shoemaker at the camp. The watch (Rolex watch no. 185983) was delivered to Stalag Luft III on 10 July that year along with a note from Wilsdorf apologising for any delay in processing the order and explaining that an English gentleman such as Corporal Nutting "should not even think" about paying for the watch before the end of the war. Wilsdorf is reported to have been impressed with Nutting because, although not an officer, he had ordered the expensive Rolex 3525 Oyster chronograph while most other prisoners ordered the much cheaper Rolex Speed King model which was popular because of its small size. The watch is believed to have been ordered specifically to be used in the Great Escape when, as a chronograph, it could have been used to time patrols of prison guards or time the 76 ill-fated escapees through tunnel 'Harry' on 24 March 1944. Eventually, after the war, Nutting was sent an invoice of only £15 for the watch, because of currency export controls in England at the time. The watch and associated correspondence between Wilsdorf and Nutting were sold at auction for £66,000 in May 2007, while at an earlier auction on September 2006 the same watch fetched A$54,000. Nutting served as a consultant for both the 1950 film The Wooden Horse and the 1963 film The Great Escape. Both films were based on actual escapes which took place at Stalag Luft III. It was also reported that in November 2013 the Rolex Speed King owned by Flight Lieutenant Gerald Imeson during the Great Escape was sold for £60,000.
In a famous murder case, the Rolex on Ronald Platt's wrist eventually led to the arrest of his murderer, Albert Johnson Walker—a financial planner who had fled from Canada when he was charged with 18 counts of fraud, theft, and money laundering. When the body was found in the English Channel in 1996 by a fisherman named John Coprik, a Rolex wristwatch was the only identifiable object on the body. Since the Rolex movement had a serial number and was engraved with special markings every time it was serviced, British police traced the service records from Rolex and identified the owner of the watch as Ronald Platt. In addition, British police were able to determine the date of death by examining the date on the watch calendar. Since the Rolex movement was fully waterproof and had a reserve of two to three days of operation when inactive, they were able to determine the time of death within a small margin of error.
Rolex watches are frequently counterfeited, often illegally sold on the street and online. Counterfeit Rolex watches vary in quality, with some using the cheapest of movements and others using automatic movements, some even with an ETA movement. However, most counterfeit watches are easily identifiable by jewellers and other experts. O. J. Simpson wore a counterfeit watch during his murder trial. 
Hans Wilsdorf Foundation
Rolex SA is owned by the private Hans Wilsdorf Foundation, which is registered as a charity and does not pay corporate income taxes. In 2011, a spokesman for Rolex declined to provide evidence regarding the amount of charitable donations made by the Wilsdorf Foundation.