BlueMark, a Tideline company, is a leading provider of independent impact verification services for investors and companies.

BlueMark, Tideline’s independent impact verification company, was created to meet the need for reliable, third-party assurance of impact claims and practices.

BlueMark, Tideline’s independent impact verification company, was created to meet the need for reliable, third-party assurance of impact claims and practices.

We believe shared trust is essential to scaling market demand for impact investment products and services – just as in any other market – and independent verification is key to establishing and maintaining that trust.

With decades of direct experience, the BlueMark team brings unrivaled knowledge and capabilities necessary to provide a range of specialized impact assurance services.

We currently offer three types of complementary services that collectively deliver greater confidence at each stage of the impact investing process.

BlueMark’s Impact Verification Services


We assess whether an investor has a robust impact thesis that is aligned with industry standards.


We assess the degree to which an investor’s impact management (IM) practices are aligned with market standards.


We assess whether an investor’s impact reporting is consistent with industry best practices.

We started the verification process with opened eyes and ended it with wiser eyes. We learned how much more we can do in this journey, as striving for excellence in our impact practices is not a sprint but a marathon.

BlueOrchard Finance
Maria Teresa Zappia, Deputy CEO & Chief Impact and Blended Finance Officer

MAKING THE MARK — Investor Alignment with the Operating Principles for Impact Management

Verification represents the next step in the evolution of the impact investing industry, bringing added credibility to the marketplace and holding all impact investors accountable to a shared set of standards, principles, and best practices.

In April 2020, Tideline published a report to explore how impact investors are coalescing around best practices and addressing shared challenges based on the aggregated results of BlueMark’s first 13 impact verifications.

Click here to download Tideline’s benchmark report on impact verification.

Our Approach

We view every verification assignment as an opportunity to partner with our clients to help identify strengths and potential areas for improvement. BlueMark goes beyond a ‘check-the-box’ exercise by providing in-depth assessments and benchmarks that advance our clients’ understanding and achievement of best practices. We empower our clients by providing them with the tools, resources, and third-party expert opinions necessary to succeed.

  • For asset managers, an independent verification exercise is essential to impact achievement and risk mitigation.
  • For asset allocators, independent verification serves as a reliable and efficient input to robust diligence and assurance.
  • And for the impact investing market, verification enables increased confidence that impact claims will turn into impact outcomes.

We specifically designed our verification methodology to bring these three benefits to the impact investing market:


By evaluating whether impact investors’ practices and performance are aligned to accepted market standards


By encouraging transparency, adoption of industry best practices, and shared learning that continuously raises the bar for performance


By establishing benchmarks and ratings that allow stakeholders to compare different approaches to impact investing on a consistent basis



LeapFrog Investments is a leading impact investor in emerging markets and in 2019 raised the largest-ever private equity fund by a dedicated impact fund manager, with a $743 million fund investing in healthcare and financial services companies in Asia and Africa. As a leader in the field, LeapFrog played a key consultative role in the development of the Operating Principles for Impact Management, which were launched in 2019 and endorsed by many of the world’s largest and leading asset managers.

LeapFrog recognized the importance of authenticity and accountability to scale the field, and sought out an independent verifier that would be able to both rigorously assess the firm’s impact management systems and provide a roadmap for continued learning and improvement. Tideline was selected based on its market-leading experience in developing impact measurement and management systems, as well as its proprietary approach to assessing alignment with each of the Principles and providing detailed feedback on both strengths and potential areas for improvement.

The efficient, four-week engagement resulted in a thorough assessment of LeapFrog’s alignment with each of the Principles, based on the review of hundreds of pages of investment policies, tools, memoranda, and impact reporting. The verification findings for LeapFrog reinforced the firm’s leadership position in impact management and set a high bar for alignment against the Principles. LeapFrog has since leveraged Tideline’s insights to further strengthen its Profit with Purpose strategy, including through the institutionalization of the firm’s Responsible Exits Framework.