If you're looking for a concrete indicator that shows how the larger D.C. tech scene has evolved in recent years then look no further than this list of the largest fundings in the region.

To some degree, it all comes down to individual companies being able to attract substantial investment. This investment is used, among other things, to accelerate growth, expand the workforce, develop new products and ultimately, to further innovation. For many tech founders, the difference between scoring a round of private capital and striking out can dictate whether doors close or a longterm future is viable.

To begin, D.C., Va. and Md. can already lay claim to being home to any number of recognizable tech brands and even highly profitable exits over the past several years—Mandiant and Virtustream come to mind. But consistently attracting major funding rounds from institutional investors has remained a challenge.

2015 is changing that narrative.

From Q1 to Q3 (January to November) 2015, the D.C. area's startup and larger tech ecosystem attracted more than $700 million in investment, according to a data report provided by the National Venture Capital Association and PricewaterhouseCoopers.

Q4 has yet to end, and as such those respective numbers are unavailable via NVCA/PwC MoneyTree reports. The next report will be released in January to account for Q4 (November to January). Luckily, here at DC Inno we've been covering the local tech business scene in detail all year, and have an updated leaderboard to share with you.

These are the top 10 D.C. tech funding rounds of 2015 by dollar amount:

1.) Tenable Network Security (Columbia, Md.)

Amount: $250 million
Round: Series C
Date: November 10
Investors: Insight Venture Partners, Accel Venture Partners
What they do: network monitoring cybersecurity

2.) Vox Media (Washington, D.C.)

Amount: $200 million
Round: growth stage investment
Date: August 13
Investors: NBC Universal/Comcast
What they do: media company, content management system developer

3.) Tanium (Emeryville, Calif., and McLean, Va.)

Amount: $120 million
Round: follow-on, additional financing
Date: September 2
Investors: TPG, Institutional Venture Partners (IVP), a16z, T. Rowe Price Associates, among others
What they do: endpoint cybersecurity

4.) STG Group (Reston, Va.)

Amount: $113 million
Round: equity raise venture round
Date: November 30
Investors: undisclosed
What they do: cybersecurity, secure IT systems, intelligence analytics services

5.) RainKing Solutions (Bethesda, Md.)

Amount: $67 million
Round: venture round
Date: October 13
Investors: Spectrum Equity
What they do: a customer retention management (CRM) cloud database company

6.) MapBox (Washington, D.C.)

Amount: $52.6 million
Round: Series B
Date: June 17
Investors: DFJ Growth, Foundry Group, DBL Partners, Thrive Capital
What they do: open-source mapping data API developer

7.) LookingGlass Cyber Solutions (Baltimore, Md.)

Amount: $50 million
Round: Series C
Date: December 11
Investors: NewSpring Capital
What they do: threat intelligence management system, cybersecurity

8.) IronNet Cybersecurity (Fulton, Md.)

Amount: $32 million
Round: Series A
Date: November 2
Investors: Trident Capital Cybersecurity, Kleiner Perkins Caufield & Byers
What they do: cybersecurity consulting services

9.) ZeroFOX (Baltimore, Md.)

Amount: $27 million
Round: Series B
Date: December 3
Investors: Highland Capital Partners, NEA, Genacast Ventures and Core Capital Partners
What they do: network cybersecurity

10.) Zippy Shell (Washington, D.C.)

Amount: $25 million
Round: Series A
Date: June 4
Investors: Virgo Investment Group
What they do: self-storage and moving company enabled by a mobile software platform