Arthur Waller
About Arthur Waller
Arthur Waller studied economics and econometrics at Sciences Po and Ecole Polytechnique. He interned in the Global Investment Research department at Goldman Sachs in London. His LinkedIn profile says he then co-founded PriceMatch, which built algorithms to predict demand and recommend prices for hotels.
Booking.com acquired PriceMatch in May 2015, and it became part of Booking's B2B software suite for hotels, BookingSuite. Waller spent about 3.5 years at Booking, in BookingSuite and then the Pricing Department. He then took time off to travel.
He is now co-founder and CEO of Pennylane. PitchBook also lists him as a board member of Gens De Confiance and Amenitiz, a former board member of Shippeo, and a former partner at LeStudio VC. He is based in Paris.
PitchBook lists 21 investments for Waller, 18 of them in portfolio companies, with 3 exits. Crunchbase counts 17 personal investments, and Tracxn counts 18. The counts differ because each database tracks different deals.
PitchBook dates recent deals as follows: RockFi (Mar 2025), Yampa (Dec 2024), Lago (Mar 2024), Catalog (Mar 2024), Primo (Apr 2023) and Lokki (Dec 2022). Tracxn records a seed investment in Yavin in September 2021 alongside Seedcamp and others. His LinkedIn profile describes him as an occasional investor and mentor.
Opio announced a €4M first round in September 2026 with Seedcamp, Frst and GFC. Seedcamp's announcement names Waller among Opio's angel investors. Opio builds software that collects, verifies and organises company financial data for financial due diligence. Forvis Mazars and BDO are among its customers.
Waller also joined Yampa's €3M seed round, led by Partech. Nordic9 classifies Yampa as an AI CRM software company.
Public records show mostly seed and early-stage rounds, with some Series A participation (RockFi, Obat, Spiko, per Crunchbase and PitchBook). Tracxn lists Enterprise Applications and FinTech as his top sectors. It says his portfolio is mainly in France, with some companies in the United States and one other country.
Waller has not publicly stated a check size or a formal investment thesis, so none is given here.
- Opio: AI financial due diligence automation, €4M first round, September 2026.
- Yampa: AI CRM software, €3M seed led by Partech, December 2024 per PitchBook.
- RockFi: Series A round, March 2025.
- Lago: business software company, invested March 2024 per PitchBook.
- Catalog (Paris): business software company, invested March 2024 per PitchBook.
- Primo: seed round, April 2023 per PitchBook.
- Lokki: seed round, December 2022 per PitchBook.
- Yavin: seed round, September 2021, with Seedcamp as co-investor.
- Planity and Orus: listed by Tracxn as his most notable investments.
- fr.linkedin.com/in/arthur-waller-a793a611
- pitchbook.com/profiles/investor/170384-23
- crunchbase.com/person/arthur-waller
- tracxn.com/d/people/arthur-waller/__rREZ1ohW5BVlzlCf0XD1PewVhuaj0S-DBr
- tracxn.com/d/people/arthur-waller/__d1xM0c2bwJeP2pyTT9qmBLo6DNcajYJEvb
- seedcamp.com/views/opio-raises-e4m-to-automate-repetitive-financial-du
- nordic9.com/news/yampa-in-a-3-million-seed-deal-led-by-partech-joined-
Investing activity
Arthur Waller appears in 1 AI deal tracked by the Lounge deals desk. The rounds are mostly Seed, with a median round size of $5M. The most recent is Opio (Seed, €4M, Sep 2026).
Arthur Waller most often invests alongside Frst, GFC, Seedcamp and Stanislas Polu, and the companies they back on Lounge are mostly in AI.
Deals
Frequently asked questions about Arthur Waller
Who is Arthur Waller?
Arthur Waller is a Paris-based entrepreneur and angel investor. He is co-founder and CEO of Pennylane and previously co-founded PriceMatch, which Booking.com acquired in 2015.
Has Arthur Waller invested in AI startups?
Yes. He is named as an angel investor in Opio's €4M first round in September 2026. He also joined Yampa's €3M seed round, led by Partech.
What stage does Arthur Waller invest in?
Public records show mainly seed rounds, with some Series A participation. He has not published a formal stage policy.
What is Arthur Waller's check size?
It is not public. No check size or fund size appears in the sources reviewed, so founders should not assume one.
Which sectors and regions does Arthur Waller back?
Tracxn lists Enterprise Applications and FinTech as his main sectors. His portfolio is mostly in France.
How can founders contact Arthur Waller?
His public profile is on LinkedIn at linkedin.com/in/arthur-waller-a793a611. No personal website or X account was found.
Is Arthur Waller an angel investor?
Yes. Arthur Waller invests personally as an angel.
What AI companies has Arthur Waller invested in?
Arthur Waller's AI investments include Opio. The 1 round on Lounge are listed on this page with amounts, dates and co-investors.
What stage does Arthur Waller invest at?
In the rounds tracked on Lounge, Arthur Waller has invested at Seed, with a median round of $5M.
Who does Arthur Waller co-invest with?
Arthur Waller's most frequent co-investors on Lounge are Frst (1 deal), GFC (1 deal), Seedcamp (1 deal) and Stanislas Polu (1 deal).