Studio Sarto Sieni

What Studio Sarto Sieni does

Studio Sarto Sieni STP S.r.l. is a privately held multidisciplinary professional services firm headquartered in Florence, Italy, with connected offices in Pistoia and a second Florence location. Founded in 1981 by Gianni Sarto (a former Italian Ministry of Finance official) and Marco Sieni as a small family tax practice, the firm has evolved over four decades into a coordinated advisory practice covering tax advisory and compliance, corporate and business advisory, startup and business plan services, accounting and financial statement preparation, employment and HR services, wealth/real estate/succession planning, statutory audit and valuations, and civil/commercial legal assistance.

The firm operates through a dedicated contact-person model in which each client is assigned a primary advisor who coordinates additional internal expertise as needed. Its technology stack is conventional professional services infrastructure rather than proprietary platform: a client portal (portale.studiosartosieni.it) provides secure access to documents, deadlines, and notifications, and integrates third-party tools including WebDesk, TeamSystem Fatture in Cloud (electronic invoicing), and Aruba PEC (certified email). Operational accounting and administrative processing are routed to a closely affiliated entity, Rubino Service S.r.l., which has supported the firm since its foundation and operates under direct professional supervision.

The firm's revenue model is fully customised professional services pricing on a quote-by-engagement basis, with no standardised packages or price lists and a free initial consultation as the acquisition entry point. It serves a diversified client base of approximately 309 clients across entrepreneurs and startup founders, established SMEs, partners/directors/investors, families and individuals, and property owners. The firm maintains multilingual capabilities across Italian, English, Spanish, French, and Russian to serve both domestic and international clients. In 2025, the practice underwent a corporate transformation into a Società tra Professionisti S.r.l. under partners Tommaso Sarto (son of the founder) and Lorenzo Zanaga.

Name

Studio Sarto Sieni

Legal name

Studio Sarto Sieni STP S.r.l.

Website

https://studiosartosieni.it

Company type

Private

Founded year

1981

Operating status

Operating

Headcount range

11–50 employees

Short description

Studio Sarto Sieni is a Florence-based multidisciplinary Italian professional services firm, founded in 1981, providing integrated tax, corporate, accounting, HR, audit, succession, and legal advisory to SMEs, entrepreneurs, families, and property owners through 18 professionals.

Ownership category

akta.pro rank

Product category

Professional Tax and Business Advisory Services

NAICS

Management, Scientific, and Technical Consulting Services (5416)

SIC

Services-Engineering, Accounting, Research, Management (8700)

akta.pro primary industry

Transaction Services (Financial, Tax & Commercial Due Diligence) (BPAHAOAB)

akta.pro secondary industry

Private Client/High-Net-Worth Advisory (FSAEAAAN)

Keywords

• Tax advisory services
• Corporate consulting
• Accounting services
• Audit and valuation
• Wealth succession planning

Headquarters

HQ city

Firenze

HQ country

Italy

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Professional Advisory Services: Studio Sarto Sieni generates revenue through professional advisory and consulting services across multiple disciplines: tax advisory and compliance, corporate and business advisory, startup and business plan services, accounting and financial statements, employment and HR services, private wealth and succession planning, legal assistance, and audit/review services. The firm operates on a quote-based model where each client receives a customized quote based on their specific needs rather than standardized packages.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels4 records

Core offering

Studio Sarto Sieni is a multidisciplinary professional advisory firm delivering integrated tax, corporate, accounting, employment, audit, wealth/succession, and legal services to Italian and international SMEs, entrepreneurs, families, and individuals. Each client is assigned a dedicated contact person who coordinates the right specialists across the firm's practice areas, with a client portal providing electronic invoicing, certified email, and document management. Service pricing is fully customized per engagement rather than sold as standardized packages.

Product overview

Studio Sarto Sieni is a multidisciplinary professional advisory firm offering integrated professional services through eight core practice areas: tax advisory, corporate advisory, startup and business development, accounting, human resources, wealth/real estate/succession planning, audit and valuations, and legal assistance. Services are coordinated by dedicated contact persons with internal team support. The firm also provides a client portal (Portale dei Servizi) for access to electronic invoicing and document management. An affiliated company, Rubino Service S.r.l., handles accounting and data processing operations. The offering is structured as a unified professional services firm rather than a modular software product.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• 7,740 tax declarations submitted in 2025
• +2 more outcomes

Named customers5 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

One partnership is on record.

• Rubino Service S.r.l.coreTechnology or IntegrationRubino Service S.r.l. is the business data processing company that has supported the firm since its foundation. It provides purely accounting services to clients, ensuring immediate and direct access to the professional expertise and specialist supervision of Studio Sarto Sieni. This partnership handles operational accounting and administrative processing under the professional oversight of the main firm.

Scale indicators6 records

Recent moves8 records

Expansion highlights5 records

Broad incumbents

• Deloitte Italy: Deloitte's Italian practice offers tax, audit, consulting, and legal advisory services to enterprises across all segments. As the largest professional services firm in Italy, it competes with Studio Sarto Sieni for SME and family-owned business clients while serving significantly larger enterprise mandates that the boutique firm cannot pursue.
• PwC Italy: PwC Italy delivers tax, audit, and advisory services including extensive support for family businesses, SMEs, and entrepreneurs. Its multidisciplinary model mirrors Studio Sarto Sieni's integrated approach but at much larger scale with technology platforms and international reach the boutique cannot match.
• EY Italy: EY's Italian practice offers tax, audit, transaction advisory, and consulting services with particular strength in private client services and family office advisory. Competes with Studio Sarto Sieni for HNW families and SME clients while serving enterprise mandates beyond the boutique's capacity.
• KPMG Italy: KPMG's Italian operations provide audit, tax, and advisory services with deep expertise in Italian tax compliance, corporate advisory, and family business consulting — directly overlapping Studio Sarto Sieni's core offerings but at substantially greater scale and with international network support.

Direct peers

• RSM Italy: RSM's Italian member firm provides audit, tax, and consulting services to mid-market companies, entrepreneurs, and family businesses. Closely comparable to Studio Sarto Sieni in client segment focus and multidisciplinary service model, with the advantage of international network affiliation.
• Grant Thornton Italy: Grant Thornton's Italian member firm provides audit, tax, and advisory services focused on mid-market companies, family businesses, and entrepreneurs. Closely comparable to Studio Sarto Sieni in client profile and multidisciplinary service delivery, with international network resources the boutique lacks.
• BDO Italia: BDO Italia is a mid-tier international accounting and advisory network serving Italian SMEs, entrepreneurs, and family businesses with audit, tax, and corporate advisory services. Most directly comparable to Studio Sarto Sieni in target market and service breadth, but operating at larger scale as part of a global network.
• Crowe Italy: Crowe's Italian practice delivers audit, tax, and consulting services to SMEs, family businesses, and private clients. Comparable to Studio Sarto Sieni in target market and integrated service offerings, with the scale and international reach benefits of a global network.
• Mazars Italy: Mazars Italy provides audit, tax, and advisory services with particular focus on family businesses, SMEs, and entrepreneur-led companies. Comparable to Studio Sarto Sieni in multidisciplinary service model and client segment focus, operating as part of an integrated international partnership.
• Baker Tilly Italy: Baker Tilly's Italian practice offers audit, tax, and advisory services focused on SMEs, family businesses, and entrepreneurs — directly mirroring Studio Sarto Sieni's target segments and integrated multidisciplinary approach, with additional international network reach.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/channel/UCw5gzbX4A4Z4g3X1q
• LinkedInlinkedin.com/company/studio-sarto-sieni

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Studio Sarto Sieni