COSIM
COSIM is a Paris-based property hunting (chasseur immobilier) firm that provides exclusive-mandate apartment search, negotiation, and transaction support for individual residential buyers across Paris and Île-de-France, supplemented by seller-side coaching and investment advisory services.
- Company typePrivate
- Founded2014
- HeadquartersParis, France
- Headcount1–10
- GTM typeB2C
- OfferingServices
What COSIM does
COSIM is a Paris-based property hunting firm (chasseur immobilier) founded in 2014 by Florian Marjolet to serve individual residential buyers purchasing apartments and houses in Paris and the surrounding Île-de-France suburbs. The company operates on an exclusive mandate basis, capping each consultant at three concurrent projects to maintain personalized service delivery. Its core product is a tailored property search spanning initial consultation, exhaustive research, targeted visits, price negotiation, and transaction support through notarial formalities, supplemented by a Coaching Immobilier service for sellers, a Property Sales brokerage, an Investment Advisory layer for yield-focused buyers, and the COSISSIME referral program.
The underlying technology is a property search and matching platform supported by an extensive human network of over 2,500 negotiators across Paris, plus an in-house advanced scanning tool designed to identify and match properties across the market. Notably, COSIM deliberately rejects automation in its service delivery, positioning human expertise, listening, and adaptability as the central differentiator — a stance that defines both its value proposition and its technological ceiling. The platform architecture is therefore human-mediated rather than data-driven, with no disclosed API, SDK, machine-learning pipelines, or proprietary AI assets.
COSIM earns revenue primarily through transaction fees of 2–3% of purchase price, applied via cumulative degressive tiers (regulated under the French Hoguret Law of January 2, 1970). Fees are payable only on successful completion of a transaction, eliminating upfront research, launch, or negotiation charges. Secondary revenue comes from seller-side coaching engagements and commercial property sales under the Property Sales offering. Go-to-market is sales-led via direct website inquiry, phone contact, organic content marketing through blog and social channels, and a structured referral program (COSISSIME) that pays existing clients €200 at mandate signature and €200 at fee collection.
COSIM firmographics
Firmographics- Name
- COSIM
- Legal name
- COSIM
- Website
- https://cosim.fr
- Company type
- Private
- Founded year
- 2014
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- COSIM is a Paris-based property hunting (chasseur immobilier) firm that provides exclusive-mandate apartment search, negotiation, and transaction support for individual residential buyers across Paris and Île-de-France, supplemented by seller-side coaching and investment advisory services.
- Ownership category
- akta.pro rank
COSIM industry classification
Industry- Product category
- Residential Real Estate Services
- NAICS
- Offices of Real Estate Agents and Brokers (5312)
- SIC
- Real Estate Agents & Managers (For Others) (6531)
- akta.pro industry
- Buyer Representation ServicesBusiness & Public Services/Real Estate Services (Brokerage, Property Management)/Residential Real Estate Brokerage
Keywords
Where COSIM is headquartered
LocationHeadquarters
- HQ city
- Paris
- HQ country
- France
- HQ region
- Europe
Offices1 record
Markets served
COSIM business model
Business model- GTM type
- B2C
- Offering type
- Services
- Cost components
- Personnel, Marketing or Sales, Operations, Others
Revenue model
- Property Search Services: Fees are charged only upon successful completion of property purchase. No launch fees, research fees, or negotiation fees are charged upfront. Fees are determined at the signing of the search mandate and correspond to a fee schedule applicable to all clients.
- Sales Coaching Services: Personalized real estate coaching service for property sellers, offering a menu of services tailored to client needs.
- Property Sales Commission: Cumulative degressive percentage-based fees applied by price tranche. The percentage is between 2% and 3% of the purchase price (excluding notary fees). COSIM uses cumulative degressive pricing to avoid threshold effects that disadvantage buyers.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Transaction based/ take rate | Pay-as-you-go | Percentage-based pricing with cumulative degressive tiers applied to purchase price |
Go-to-market motion1 record
Distribution channels3 records
Marketing channels5 records
COSIM product offering
Product offeringCore offering
COSIM is a Paris-based property hunting (chasseur immobilier) firm that runs personalized residential property searches for buyers across Paris and the Île-de-France region. Under an exclusive search mandate model, the team handles the full acquisition process — detailed project analysis, exhaustive property research, targeted visits, price negotiation, transaction security, and notary/mortgage support. The firm complements buyer-side services with seller-side coaching, property sales representation, and investment advisory.
Product overview
COSIM is a Paris-based property hunting company offering a suite of real estate services centered around its core Property Hunter offering. The company provides personalized apartment and property search services, complemented by a Coaching Immobilier module for sellers, Property Sales services, the COSISSIME referral program, Investment Advisory, and Paris Market Analysis. COSIM operates exclusively on an exclusive mandate basis to ensure quality service delivery.
Differentiator
Problem solved
Functional benefit
Products and services
- Property Hunter (Recherche Immobilière Sur Mesure) Personalized apartment and house search service for individual buyers in Paris and surrounding suburbs. COSIM handles the entire acquisition process — initial consultation, property research, accompanied visits, price negotiation, document review, mortgage and notary coordination, and key handover. Delivered under an exclusive search mandate with a maximum of three concurrent projects per consultant.
- Coaching Immobilier Personalized coaching service for property sellers, covering pricing strategy, marketing, staging, visit management, and negotiation guidance, provided without COSIM taking exclusive sales mandate.
- Property Sales (Ventes) Exclusive property commercialization service in which COSIM represents the seller, handling the full sales process from valuation through transaction completion.
- Investment Advisory Advisory service for clients purchasing Paris property as an investment. COSIM identifies optimal zones, explains rental regulations, evaluates rental yields, and surfaces off-market opportunities, typically as part of a broader Property Hunter mandate.
Quantifiable outcome
- 78% success rate for property searches
- +2 more outcomes
Companies that use COSIM
Customer profileNamed customers9 records
Segments4 records
Ideal customer profiles4 records
COSIM technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature3 records
COSIM partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- MEDIATION – VIVONS MIEUX ENSEMBLEminorMediation service for amicable resolution of disputes. Located at 2 impasse de Beauregard, 54000 Nancy. Available for customers to resolve disputes in accordance with French Consumer Code provisions.
Scale indicators6 records
Recent moves6 records
Expansion highlights5 records
COSIM competitors and assessment
Company assessmentBroad incumbents
- IAD France: Major French network of independent real estate agents operating across residential sales nationwide. Comparable on Paris residential transaction activity but with a fundamentally different agent-network business model and far broader scale.
- OptimHome: Large French real estate network with residential brokerage and network-agent model across France. Comparable to COSIM on Paris residential representation but at much greater geographic and operational scale.
- Stéphane Plaza Immobilier: Large French real estate franchise network with broad residential brokerage coverage across France. Comparable to COSIM on Paris residential brokerage but operates as a mass-market franchise rather than a boutique buyer-rep service.
- LeBonCoin: France's leading general classifieds platform with a substantial real estate vertical, including Paris listings from individuals and professionals. Comparable to COSIM on the Paris property search category but operates as a horizontal marketplace, not a buyer-representation service.
- Guy Hoquet Immobilier: Large French real estate franchise network with nationwide agent coverage and full residential brokerage services. Comparable to COSIM on residential brokerage activity but operates at much larger scale and broader geographic scope.
- SeLoger: Leading French online real estate listing portal aggregating listings from agencies and agents nationwide. Comparable on Paris residential property search but serves as a listings marketplace rather than a buyer-representation service like COSIM.
- Bien'ici: Major French real estate search platform aggregating listings from agencies and private sellers across France. Comparable to COSIM on Paris residential property discovery but functions as a listings portal rather than a fee-based buyer-rep service.
- Laforêt: Established French real estate franchise network offering residential sales and rental services nationwide. Comparable on residential buyer/seller representation in Paris but serves a much broader market with traditional commission-based pricing.
Direct peers
- Proprioo: Paris-headquartered flat-fee real estate agency offering buyer and seller representation at reduced commission versus traditional agencies. Comparable to COSIM on buyer-rep focus, Paris footprint, and mid-market residential segment.
- Homki: French proptech apartment-hunting service operating in Paris and other major French cities, with a network of partner agents and a flat-fee buyer-representation model. Directly comparable to COSIM on product (chasseur immobilier), target customer (residential buyers), and geography (Paris).
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks5 records
Key highlights7 records
Customer concentration
COSIM social profiles
Digital presenceCOSIM financial estimates
Financial estimateRevenue estimate
Valuation estimate
COSIM leadership team
Management profileNumber of profiles
Profiles1 record
COSIM funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
COSIM M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about COSIM
What does COSIM do?
COSIM is a Paris-based property hunting (chasseur immobilier) firm that runs personalized residential property searches for buyers across Paris and the Île-de-France region. Under an exclusive search mandate model, the team handles the full acquisition process — detailed project analysis, exhaustive property research, targeted visits, price negotiation, transaction security, and notary/mortgage support. The firm complements buyer-side services with seller-side coaching, property sales representation, and investment advisory.
Is COSIM a public or private company?
COSIM is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was COSIM founded?
COSIM was founded in 2014. It employs 1 to 10 people.
Where is COSIM based?
COSIM is headquartered in Paris, France, in the Europe region.
How does COSIM make money?
Three revenue lines are on record. Property Search Services are the primary driver. The others are sales Coaching Services and property Sales Commission.
Who are COSIM's main competitors?
Broad incumbents on record are IAD France, OptimHome, Stéphane Plaza Immobilier, LeBonCoin, Guy Hoquet Immobilier, SeLoger, Bien'ici and Laforêt. Direct peers are Proprioo and Homki.
Does COSIM have an API?
No public API is recorded for COSIM.
What industry is COSIM in?
COSIM's product category is Residential Real Estate Services. Its primary akta.pro industry code is BPAJAAAJ, Buyer Representation Services. Its NAICS code is 5312 and its SIC code is 6531.