Siam Inter Auction

What Siam Inter Auction does

Siam Inter Auction Public Company Limited (SIA) is a Thai vehicle auction company headquartered at 180 Ramkhamhaeng Road, Bangkok, operating as a public limited company (มหาชน/PCL). SIA runs scheduled vehicle auctions every Monday and Friday at 10:10 AM across multiple physical auction sites and warehouse/branch locations nationwide, auctioning cars, motorcycles, trucks, and buses to a horizontal mix of individual, SMB, and institutional buyers and sellers. The company also conducts dedicated auctions for vehicles seized by Thailand's Office of the Narcotics Control Board (ONCB/ป.ป.ส.) under specialized government liquidation procedures.

SIA's technology stack is a unified, multi-format digital auction platform centered on the SIA E-Auction System (auction.sia.co.th) for real-time online bidding, supplemented by the Proxy Bidding System (proxy.sia.co.th) for automated ceiling-price bidding and the TIMEFIX Auction System (timefix.sia.co.th) for fixed-time extended-window auctions. Supporting infrastructure includes the Blue Book Search / Registration Book System (regbook.sia.co.th) for vehicle registration document tracking, a Vehicle Listings catalog with search and filtering, an Auction Calendar, a Customer Service portal for membership and deposit management, and a Car Grade System that classifies vehicles into standardized condition grades (A, B, C, D+, D, E). The marketing footprint spans Facebook, YouTube, TikTok, Instagram, LINE Official Account, and a corporate website, with formal Thailand PDPA B.E. 2562 (2019) compliance governance and appointed Data Protection Officers.

SIA's business model is transaction-fee based, monetizing each successful vehicle auction across multiple formats and seller types — including private owners, dealerships, leasing companies, financial institutions, and government agencies. Membership and auction participation require deposit payments managed through LINE@ and customer service channels, while specific fee schedules are not publicly disclosed. The combination of recurring institutional seller supply (including the ONCB government channel), a long-tail online buyer base, and multiple bidding formats constitutes the core revenue engine, with no disclosed subscription or SaaS pricing component.

Name

Siam Inter Auction

Legal name

บริษัท สยามอินเตอร์ การประมูล จำกัด (มหาชน)

Website

https://sia.co.th

Company type

Public

Founded year

2022

Operating status

Operating

Headcount range

1–10 employees

Short description

Siam Inter Auction (SIA) is a Thai public limited company operating a nationwide vehicle auction platform — running physical and online auctions for cars, motorcycles, trucks, and buses across multiple digital formats — serving individual, SMB, and institutional buyers and sellers, including ONCB government seized-asset liquidations.

Ownership category

akta.pro rank

Product category

Vehicle Auction Services

NAICS

Automobile and Other Motor Vehicle Merchant Wholesalers (423110)

SIC

Wholesale-Motor Vehicles & Motor Vehicle Parts & Supplies (5010)

akta.pro primary industry

Wholesale Vehicle Auctions (Physical & Online) (TLABAKAA)

Keywords

• Vehicle auction services
• Used car auctions
• Online bidding platform
• Auction house operations
• Motorcycle truck auctions

Headquarters

HQ city

Bangkok

HQ country

Thailand

HQ region

Asia

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Digital Commerce or Content

Cost components

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

Revenue model

1. Vehicle Auction Fees: Revenue generated from auctioning vehicles (cars, motorcycles, trucks, buses) to buyers. The platform charges fees for conducting the auction process, connecting sellers with verified buyers through competitive bidding.

Go-to-market motion1 record

Distribution channels4 records

Marketing channels6 records

Core offering

SIA operates scheduled vehicle auctions in Thailand, primarily on Mondays and Fridays at 10:10 AM, auctioning cars, motorcycles, trucks, and buses through a combination of physical auction sites and online bidding platforms. It offers three parallel online auction formats — standard E-Auction, Proxy Bidding, and TIMEFIX — along with supporting systems for vehicle grading, registration tracking, and membership/deposit management. The platform connects vehicle sellers (dealerships, leasing firms, financial institutions, government agencies such as ONCB, and individuals) with verified buyers via competitive bidding, earning auction/transaction fees.

Product overview

Siam Inter Auction (SIA) operates a unified vehicle auction platform consisting of multiple integrated digital services. The core offering centers on the SIA E-Auction System for live online bidding, supplemented by the Proxy Bidding System for automated bidding and the TIMEFIX Auction System for extended-time auctions. Supporting services include the Blue Book Search System for registration tracking, a comprehensive Vehicle Listings catalog with search functionality, an Auction Calendar showing regular Monday/Friday sessions, a Customer Service System for membership and deposits, and a Car Grade System for vehicle condition assessment. The company also handles specialized ONCB (Office of the Narcotics Control Board) vehicle auctions.

Differentiator

Problem solved

Functional benefit

Products and services

• SIA E-Auction System (ระบบประมูลออนไลน์)
• Proxy Bidding System (ระบบประมูลฝากราคา)
• TIMEFIX Auction System (ระบบประมูล TIMEFIX)
• Blue Book Search System (ระบบค้นหาเล่มทะเบียน)
• Vehicle Listings Catalog (รายการรถประมูล)
• Auction Calendar (ปฏิทินการประมูล)
• Customer Service / Membership System (ระบบบริการลูกค้า)
• Car Grade System (เกรดรถ)

Segments2 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

One partnership is on record.

• ONCB (Office of the Narcotics Control Board)coreOthersSIA conducts auctions for vehicles seized by the Office of the Narcotics Control Board (ป.ป.ส.), handling the specialized process for government-confiscated vehicle liquidations with dedicated auction procedures.

Scale indicators1 record

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• BCA (British Car Auctions): European vehicle auction operator running both physical and online auctions for fleets, leasing companies, and dealers. Comparable to SIA's multi-format model and reliance on institutional sellers, though serving UK and European markets.
• Copart: Global leader in vehicle auctions, including salvage and total-loss vehicles, with a strong online bidding platform. Highly comparable to SIA's vehicle auction model, though far larger and primarily operating in North America and Europe rather than Thailand.
• IAA (Insurance Auto Auctions, RB Global): Major salvage and total-loss vehicle auction operator, now part of RB Global. Comparable to SIA in running physical and online auctions of vehicles consigned by insurers and government entities, though at a much larger international scale.
• Manheim (Cox Automotive): Large US vehicle auctioneer operating physical auction sites and online simulcast. Comparable to SIA's combined physical + online auction model and dealer-to-dealer remarketing focus, though serving a different geography.

Emerging players

• Carro: Singapore-founded, Southeast Asia-focused used-car marketplace with online listings, financing, and dealer tooling. Adjacent to SIA — it competes for used-car buyer demand in Thailand but largely bypasses traditional auction intermediaries.
• One2Car: Thailand's leading online used-car marketplace, connecting private sellers and dealers directly. Competes with SIA for used-vehicle buyer and seller attention, though it operates as a listing platform rather than an auction intermediary.

Regional players

• USS Auto Auction: Japan's largest used-vehicle auction operator, running physical and online auctions for dealers. Comparable to SIA's mix of scheduled physical auctions and online bidding infrastructure, with a regional rather than Thai focus.

Direct peers

• Aucnet: Japan-based online vehicle auction platform that brings together dealer-to-dealer used-car transactions. Closely comparable to SIA's digital auction formats (E-Auction, Proxy Bidding) and its role as a B2B vehicle remarketing intermediary.
• Auction Goco (Thailand): Thailand-based vehicle auction platform focused on used cars, motorcycles, and trucks. A direct domestic competitor to SIA, with similar online auction mechanics and a focus on dealer and individual buyers in Thailand.
• Direct Auction (Thailand): Thai vehicle auction platform holding regular physical and online auctions for used vehicles. Directly competes with SIA in Thailand's used-vehicle auction space, including bank and fleet vehicle liquidations.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UCnTApeF0WhzLCH-IXbFtBcw
• Facebookfacebook.com/sia.co.th
• Instagraminstagram.com/sia.co.th
• TikToktiktok.com/@sia.co.th?lang=th-TH
• LinkedInlinkedin.com/company/siam-inter-auction

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

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 Siam Inter Auction