Press
Independent coverage, dated and grouped. Paywalled items are marked.
Selected
Kathimerini Greek
Kathimerini quoted Guy Krief, partner at Big Pi Ventures, on French startups landing in Athens in May 2026.
The Recursive reported in October 2025 that Big Pi Ventures, where he is a partner, had raised a €130 million growth fund for Greek technology.
Variety reported that Cat&Docs acquired Unclickable, the documentary about digital ad fraud, after its Thessaloniki Documentary Festival premiere in March 2024.
In October 2019, TechCrunch reported on Upstream research showing that Snaptube was serving invisible ads and making fraudulent purchases.
The Wall Street Journal Paywalled
In January 2019, The Wall Street Journal reported on Upstream's security team research into a weather app collecting excessive user data.
Ad fraud and Upstream
Mi3 Australia reported in May 2025 that Unclickable exposed how telcos, OEMs and platforms fuel a $70 billion ad-fraud market.
In October 2019, Forbes reported on a malicious Android app that Upstream's security team found installed by 40 million Play Store users.
In October 2019, Forbes cited Upstream research in reporting that 40 million users had installed a video app hiding devious malware.
Unclickable
Modern Times Review examined Unclickable's account of the bot economy in a review published in May 2024.
Cineuropa reviewed Unclickable after its premiere at the Thessaloniki Documentary Festival in March 2024.
Kathimerini Greek
Kathimerini traced the fake sites, bot traffic and real money at the centre of Unclickable in March 2024.
Big Pi Ventures and La French Tech Athens
La Tribune FrenchPaywalled
La Tribune quoted Guy Krief, partner at Big Pi Ventures and president of La French Tech Athens, on Greece's rise as a European start-up nation in June 2025.
Athens University of Economics and Business
Guy Krief spoke at AUEB's international MBA on raising deep-tech funding in Europe.
Grèce Hebdo French
Grèce Hebdo interviewed him about the French Tech Athens community in April 2023.
Portfolio
Genopole French
Genopole reported in November 2025 that Nutropy, a Big Pi Ventures portfolio company, had raised €7 million for animal-free dairy solutions.
EU-Startups reported in September 2025 that Juisci, a Big Pi Ventures portfolio company, had raised €5.5 million.
Maddyness French
Maddyness reported in September 2025 that Juisci uses Netflix- and Spotify-style interfaces to make scientific literature more accessible.
Profiles and earlier work
VICE Greece Greek
Kathimerini K-Magazine Greek
CNBC named Persado, co-founded by Guy Krief, to its 2017 Disruptor 50 list of private companies transforming their industries.