Microsoft are the larger then sony and Nintendo... but remember Nintendo are a 100% gaming company they don't make anything else other then games and Video game Hardware
actually come to think of it i would love it if Nintendo makes other products other then games... i would buy a Nintendo T.V, CD Player or Computers for sure lol

sigh a company can have a huge market cap yet never and i mean never have turned a profit think aol the first several years think the tech bust....stocks fluctuate based on rumor, perception of future profit, worry of future loss

assets=largest
market cap=most valuable
revenue=merchandise sold

i agree with kowenicki that market cap IS the best measure of a listed company but the op asked for the largest not the most valuable

Nintendo has more money reserve then Sony and makes a lot more profit then the whole company of Sony.

this is sort of off topic but while i was googling all the info i ran across this in the last 10 weeks apples marketcap has increased by an amount equal to the TOTAL market cap of sony thats freaking mindblowing

Microsoft is unquestionably the largest of the three companies, but between Sony and Nintendo it really depends on how you define larger. Nintendo produces far more profit and has a much larger market-cap but Sony’s revenue is much higher and is a much larger organization. In fact, because Nintendo is such a smaller organization which produces so much more profit on such smaller revenues is probably the reason Nintendo’s market-cap is so much higher than Sony’s; people invest in companies because of expectation of future growth, and Sony’s margins are so poor because increased competition is (slowly) eating them alive.

Apple is overpriced (do you really think that they are more valuable than Walmart? I find that hard to believe)... Intrinsically it seems Sony is underpriced... However, Sony needs to capture a significant profit before there stock price can rebound into the $60bln to $70bln range... (where Nintendo was at the peak of its stock price. Even though the strong yen has ruined Nintendo's US appearance in terms of size.

On a pure asset basis, I think it would be hard to quantify who is more valuable out of Sony and Nintendo (MSFT is always ahead). because most of nintendo's assets are virtual... I honestly couldn't put a price tag on Mario that either Sony of MSFT wouldn't be willing to pay. The plumber is probably worth $10 billion on his own.

Sony's major problem currently is that all their technology is no longer howegrown and they are using the same technology that samsung is using. For instance, Samsung's and Sony's Tvs are pretty much all based on Sharp's technology, and even though sharp doesn't sell more Tv's under its household brand than either samsung or Sony, Sony or samsung profiting benefits sharp... Kind of how Every apple computer sold benefits microsoft.

Based on the concept of buying stocks as a long term investment (and not as trading) I don’t think that Apple is overpriced; and I certainly don’t think that Sony is under-priced. Over the next 20 years mobile computing is likely going to experience the same kind of growth that the personal computer saw over the last 20 years; and Apple has positioned itself to be (one of) the dominant players in this market. At the same time, Sony is currently positioned in markets where it is facing an increasing number of competitors who are all (rapidly) eating away at the market-share they once had; and there is no real trend over the next 20 years that I see Sony capitalizing on at the moment.

Sony’s profit margins are razor thin not because Sony executives are "Nice Guys" ... their profit margins are razor thin because there is so much competition in all of the markets they’re in that they can’t sell products for a reasonable price to cover R&D and manufacturing.