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I wanted to have a better grasp of approximately how much money Twitter has raised to date, and who these investors are.  This investment has allowed Twitter to grow, and these investors significantly influence Twitter, when it comes to monetization and the fate of the developer ecosystem.

Using Crunchbase, Wikipedia and Google I was able to reconstruct the following Twitter investment timeline:

July 2007 - 5M, Valued at ??

Announcements

Taking a bite out of the big apple
Twitter by Fred Wilson

Investors

Charles River Ventures
Union Square Ventures
Marc Andreessen
Dick Costolo
Naval Ravikant
Ron Conway
Chris Sacca
Greg Yaitanes
Brian Pokorny

May 2008 - 15M, Valued at 80M

Announcements

Twitter VC Funding Done, Raises $15M

Investors

Union Square Ventures
Bezos Expeditions
Spark Capital
Digital Garage
Kevin Rose
Timothy Ferriss

February 2009  - $35M, Valued @ 250M

Announcements

Opportunity Knocks
Twitter Raises $35 Million Series C From Benchmark and IVP

Investors

Benchmark Capital
Institutional Venture Partners
Spark Capital
Union Square Ventures
Charles River Ventures
Digital Garage

September 2009 - 100M, Valued @ 1B

Announcements

New Twitter Funding
Breaking News: Twitter to Raise $100 Million From Insight, T. Rowe Price, Other Investors

Investors

Insight Venture Partners
T. Rowe Price
Spark Capital
Benchmark Capital
Institutional Venture Partners
Morgan Stanley

December 2010 - 200M, Valued @ 3-4B

Announcements

Twitter Raises $200 Million at a $3.7 Billion Valuation; Adds McCue and Rosenblatt to Board

Investors

Kleiner Perkins Caufield & Byers

August 2011 - 400 to 800M, Valued at 8B

Announcements

Your world, more connected
Twitter Said To Raise $400 Million From Russian Billionaire
Funding Values Twitter at $8.4 Billion

Investors

DST Global

December 2011 - 300M, Valued at 8.4B

Announcements

Saudi Prince Invests $300 Million in Twitter

Investors

Al-Waleed bin Talal

The low end of investment in Twitter is $1B and the high end probably looks like $1.5B, with 22 separate individuals and companies.  With Union Square Ventures and Spark Capital investing 3 times each, and Benchmark Capital, Charles River Ventures, Digital Garage and Institutional Venture Partners investing 2 times a piece.  Most recent investments involve record breaking amounts, at a staggering $8B+ valuation with a Russian tycoon and Saudi Prince.

I'm sure there are more investors and investments.  If I missed anything let me know.  

When you look at Twitter from this perspective, its easier to imagine the pressure Twitter must be under to deliver something for investors.  




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