Stephanie A. Rieben-de Roquefeuil

Co-Founder/CEO @Diadem Capital, a Venture Ecosystem Platform | Investor | LP | Venture Deal Flow (Venture Capital & Venture Debt) | $7B+ Raised for Companies | Money 20/20 USA RiseUp (2023 Alumna + 2024/25 Mentor)

📍 United States🔄 Updated September 2026💼 3 investments📅 8 years investing🗓 Last invested Jan 2026
VC🌍 United StatesInvested this year
3
Total investments
0
Early stage
0
Mid stage
2
Late stage
8y
Years active

Portfolio

3 investments · sorted by recency
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Mid stage
Late stage
Angel Member
Jan 2026
The Georgetown Angel Investor Network (GAIN) is the only official Georgetown University investor network. The network works in partnership with university-wide entrepreneurial efforts, including the Georgetown Entrepreneurship Initiative. Alumni volunteers manage GAIN, as a function of the Georgetown Entrepreneurship Alliance and the Georgetown University Alumni Association. GAIN helps to amplify the Georgetown start-up ecosystem with an innovative and inclusive angel investing network that engages and leverages the power of the diverse and global Georgetown alumni community.
Angel Member
Jan 2025
The Westchester Angels are a an investor group whose mission is to provide financial and strategic partnerships to entrepreneurs in the Westchester area. Our interest in companies goes beyond capital. We work with, and mentor, the companies we invest in. We provide both the opportunity to meet entrepreneurs and the infrastructure to facilitate individual assessments. We enjoy building businesses, seeing them succeed, and are committed to helping new and innovative companies prosper.
Investor - Pre-IPO (Growth Stage)
2018
Compass is a real estate technology company with a powerful end-to-end platform that supports the entire buying and selling workflow. We deliver an incomparable experience to both agents and their clients all in service of the Compass mission: to help everyone find their place in the world. Founded in 2012 by Ori Allon and Robert Reffkin, Compass operates in 22+ regions across the United States including New York, Los Angeles and Orange County, Chicago, San Francisco, Boston, Washington D.C., South Florida, The Hamptons, Santa Barbara & Montecito, San Diego, Seattle & Eastside, Philadelphia, Connecticut, Westchester, Aspen, Boulder, Denver, Atlanta, Austin & Central Texas, Dallas-Fort Worth, Houston, Nashville, and Lake Tahoe. Learn more and find your place at www.compass.com and www.compass.com/careers. Compass only reaches out to applicants from a @compass.com domain and does not prompt applicants to download software or files as part of its application process.
Experience · 12 entries
All (12)
Investments (3)
Founder (1)
2026
Angel Member
Jan 2026
The Georgetown Angel Investor Network (GAIN) is the only official Georgetown University investor network. The network works in partnership with university-wide entrepreneurial efforts, including the Georgetown Entrepreneurship Initiative. Alumni volunteers manage GAIN, as a function of the Georgetown Entrepreneurship Alliance and the Georgetown University Alumni Association. GAIN helps to amplify the Georgetown start-up ecosystem with an innovative and inclusive angel investing network that engages and leverages the power of the diverse and global Georgetown alumni community.
2025
Angel Member
Jan 2025
The Westchester Angels are a an investor group whose mission is to provide financial and strategic partnerships to entrepreneurs in the Westchester area. Our interest in companies goes beyond capital. We work with, and mentor, the companies we invest in. We provide both the opportunity to meet entrepreneurs and the infrastructure to facilitate individual assessments. We enjoy building businesses, seeing them succeed, and are committed to helping new and innovative companies prosper.
2022
Co-Founder & CEO
Jan 2022
Diadem Capital is an venture backed outsourced platform team and outsourced deal flow engine for VCs, CVCs and Family Offices. Diadem has worked with 70 VC portfolio companies from Pre-Seed to Series D supporting their capital raises (Equity & Debt) to secure $200M+ in venture capital over the last 3 years. Diadem raised $1.1M in its own Pre-Seed round. https://diademcapital.com/ Questions? Call: +1 (212) 287-5860 Email: equity@diademcapital.com Email: debt@diademcapital.com Securities transactions are effected through INTE Securities LLC, member FINRA/SIPC.
Limited Partner
2022
ff Venture Capital (ffVC) is focused on investing in early-stage technology and technology-enabled companies, and has been since 2008. We invest across emerging industries with a strong focus on Enterprise Software, Industrial Automation, Sustainable Transformation and Fintech, where the team has deep domain expertise. We have invested in some of the most successful, high growth companies today including; Socure, Omaze, Rhino, Rescale, Stocktwits, Owlet, and Addepar, taking a highly engaged approach helping our founders build real companies with real business models, leading to higher survivorship. True to the founder friendly name, our approach, providing deep operational expertise and support, has resulted in a 15 year track record of ffVC portfolio companies graduating to Series B at a rate 5x the industry average. ffVC invests at the earliest stage of company formation with initial investments often as the lead investor with active Board participation. Because our funds stop investing at Series B, there are exceptional co-invest opportunities for our LPs.
Mentor
2022
Quay Acceleration (Rebranded from WEVE and Cela) is dedicated to designing, building, and launching accelerator programs that serve the needs of entrepreneurs and drive out-come driven results. We achieve this through partnering with government agencies, domestic and international, as well as institutions and universities to develop programming that supports these partners in their economic development goals. Since 2017, Quay Acceleration has worked with 25+ government partners, as well as a broad range of other institutional incumbents, and has accelerated over 500 companies across the US and globe. Our portfolio has combined raised approximately $870M post-programs and have achieved results leading to new business opportunities, fundraising, partnerships, and more. Our network is composed of over 750 experts across various disciplines, industry verticals, and professions, and over 250 investor groups. Our Flagship program is a 10-week US Soft Landing accelerator for growth-stage international startups entering and scaling in the US. In addition, we build and execute customized acceleration programs for government entities and other international partners. Our accelerator programs are both industry-agnostic as well as geographically agnostic. Since 2017, we’ve accelerated 200+ companies from 34+ different countries. QUAYs startups have a working product and traction in their home markets, and have raised at least a Seed Round of capital.
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Investment activity
2018–2026 · 3 investments
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