The round, which will be used to fuel product innovation and hiring, was led by Hyde Park Venture Partners and included participation from Battery Ventures, HubSpot, Grand Ventures and High Alpha Capital.

Sigstr customers include notable brands, such as Angie's List, California Closets, Terminus and United Way, that use Sigstr to unlock their employee email as a new owned marketing channel.

Earlier this year, Sigstr signed its 300th customer, surpassed 500 million signature impressions and grew its team to over 30 employees.

"The future of marketing is authenticity. Our vision is to unleash the power of your employees and to help marketers leverage employees to market from the inside out," said Sigstr CEO Bryan Wade. "We're thrilled with our recent product innovations and are eager to continue to expand our product roadmap into areas that transcend the signature."

The Series A funding will allow Sigstr to grow its product, sales and marketing teams, as well as further develop its offerings to meet the evolving needs of marketers across a range of industries.

"Sigstr is creating a new category in marketing. Employee email is the last marketing channel that has gone untapped. Your work email is the first thing you look at when you wake up in the morning and the last thing you check before you go to bed," said Tim Kopp, partner at Hyde Park Venture Partners. "Everyday there are billions of interactions between employees and their customers, and Sigstr helps marketers take advantage of this channel to drive real marketing ROI."

"HubSpot customers have seen impressive returns when using HubSpot and Sigstr together," said Brad Coffey, Chief Strategy Officer at HubSpot. "Email signature marketing is such a natural way to deliver key content to customers and prospects. We're excited to take this next step in our partnership and help fuel Sigstr's continued growth."

In addition to this new round of funding, Sigstr recently launched its Sigstr for Events package, which allows event marketers to tap into employee email to drive event registrations, increase event attendance and involve speakers and sponsors to drive event awareness. The company also recently introduced its Account-Based Marketing (ABM) functionality, which allows users to target specific accounts, industries and regions with content tailored to each audience, while communicating with individual prospects or customer accounts as markets of one.

For more information or to schedule a demo, visit Sigstr.com.

About Sigstr
Sigstr unlocks employee email systems like Gmail and Outlook as an owned channel by providing simple, central control over your company's email signature. The SaaS product drives brand compliance and delivers real marketing ROI. Sigstr customers, like Angie's List, Invoca, Terminus, United Way, Act-On and the Indiana Pacers, among others, use clickable call-to-action banners to bring awareness and encourage engagement for key events, case studies, product updates, job opportunities and internal communication. For more information visit www.sigstr.com or connect with Sigstr on Twitter, Facebook or LinkedIn.