What Is the Central Securities Depository (MKK)? Its Functions, Registration Number, and How It Works

 

What Is the Central Securities Depository (MKK)?

 

Ensuring that capital market transactions are recorded securely, investor rights are protected, and financial markets operate transparently is essential for maintaining trust in the investment ecosystem. In Türkiye, this responsibility belongs to the Central Securities Depository (Merkezi Kayıt Kuruluşu – MKK).

MKK is the central institution responsible for the electronic registration and custody of capital market instruments, including shares, debt securities, mutual funds, and other financial assets. As physical certificates have largely been replaced by digital records, ownership information is now maintained securely through MKK's electronic infrastructure.

In simple terms, MKK enables investors to monitor their securities safely while supporting the efficient and transparent operation of Türkiye's capital markets. Just as a land registry records ownership of real estate, MKK serves as the official record-keeping system for securities.

 

What Are the Main Responsibilities of MKK?

 

The Central Securities Depository performs far more than a record-keeping function. It plays a significant role in strengthening the reliability and integrity of the capital markets by managing a wide range of operational processes.

One of its primary responsibilities is maintaining accurate electronic records of investors' securities and ensuring that ownership information remains up to date. By doing so, MKK helps safeguard investor rights while improving the traceability and security of market transactions.

In addition, MKK supports electronic general meetings for publicly traded companies, protects investor data through secure digital systems, and shares information with authorized regulatory institutions whenever required. These responsibilities contribute to a more transparent and trustworthy investment environment.

 

What Is an MKK Registration Number?

 

Every investor who participates in Türkiye's capital markets is assigned a unique MKK Registration Number (Sicil Number). This number acts as an individual identifier within the MKK system and links all securities registered under the investor's name.

The registration number serves as a unique reference that allows securities such as shares, bonds, and investment funds to be tracked accurately within the system.

Investors may occasionally receive a notification stating that an "MKK Registration Number has been created." This simply confirms that the investor has been successfully registered in the MKK system and that a unique registration number has been assigned.

 

How Do You Obtain an MKK Registration Number?

 

Investors do not need to apply directly to MKK to receive a registration number. Instead, the process begins when an investment account is opened through a licensed brokerage firm or a bank.

During the account opening process, the investor's information is transmitted electronically to the MKK system. Once the registration is completed, a unique registration number is generated automatically, allowing the investor to conduct transactions in the capital markets.

 

How Can You Find Your MKK Registration Number?

 

Investors who wish to access their registration number can contact the bank or brokerage firm where their investment account is held. Alternatively, the e-MKK Information Portal provides direct access to registration details and account information.

After logging into the portal, investors can view not only their MKK registration number but also their portfolio details, account records, and the capital market instruments held in their accounts.

 

Why Is the MKK Registration Number Important?

 

The MKK Registration Number plays a key role in ensuring that capital market transactions are carried out securely and accurately. It enables investors to verify ownership records, monitor their investment portfolios, and maintain official documentation of their securities.

The registration number is also required for various corporate actions, including participation in electronic general meetings and other shareholder-related procedures. As a result, it forms an essential part of the infrastructure that protects investor rights and supports the smooth operation of Türkiye's capital markets.

 

MKK Fees and Service Charges

 

Certain services provided by the Central Securities Depository (MKK) may be subject to fees. The terms "MKK fee" and "MKK charge" generally refer to the costs associated with maintaining securities records and providing the services required for the secure operation of the capital markets.

The amount payable may vary depending on the type of service provided, the nature of the transaction, and the policies of the bank or brokerage firm where the investment account is held. As a result, the fees charged to investors may differ from one institution to another.

 

What Do MKK Transaction Fees Cover?

 

Some capital market transactions are subject to fees determined by MKK. These may include share trading, securities transfers (book-entry transfers), dividend-related transactions, and various other capital market activities.

It is important to note that the total cost paid by investors may not consist solely of MKK fees. Banks and brokerage firms may also apply their own commissions or service charges in accordance with their pricing policies. For this reason, investors are advised to review the applicable fee schedule with their financial institution before completing a transaction.

 

What Is an MKK Account?

 

An MKK account is the electronic record through which an investor's capital market instruments are monitored within the MKK system. Shares, investment funds, debt securities, and other financial assets held by the investor are recorded and tracked through this account.

Once an investment account is opened with a bank or an authorized brokerage firm, the investor's information is automatically transferred to MKK, and the corresponding records are created. This enables investors to monitor all of their registered securities through a secure, centralized system.

 

Are There Account Opening and Annual Maintenance Fees?

 

When an investment account is opened, the investor is automatically registered in the MKK system. Depending on the policies of the bank or brokerage firm, fees may apply during the account opening process or for the ongoing maintenance of the account.

While some financial institutions charge account opening or annual maintenance fees, others may offer these services free of charge. Investors should therefore review the fee schedule of their chosen institution before opening an account.

 

How Does the MKK Registration Process Work?

 

Registration with MKK is a prerequisite for participating in Türkiye's capital markets. Once an investor is registered, their securities are officially recorded under their name and can be securely monitored through the electronic registration system.

Investors are not required to register directly with MKK. Instead, registration is completed automatically when an investment account is opened through a licensed bank or brokerage firm.

 

How Do You Register with MKK?

 

The first step in joining the MKK system is opening an investment account with an authorized financial institution. Once the account has been created, the investor's information is electronically submitted to MKK, where a unique registration record and registration number are generated.

After the registration process has been completed, investors can log in to the e-MKK Information Portal to access their account details, monitor their portfolio, and review their registration records.

 

How Can an MKK Registration Be Cancelled?

 

In certain situations, investors may request the cancellation of their MKK registration. However, before the registration can be terminated, all securities held in the investment account must generally be transferred to another account or otherwise disposed of.

Cancellation requests are submitted through the investor's bank or brokerage firm rather than directly to MKK. In addition, any outstanding financial obligations related to the account must be settled before the cancellation process can be finalized.

If an investor wishes to resume trading in the capital markets after the registration has been cancelled, a new investment account must be opened and a new MKK registration must be created.

 

What Is an MKK Account and the e-MKK Information Portal?

 

The MKK system provides investors with a centralized digital infrastructure for monitoring their capital market assets. An MKK account is the electronic record through which an investor's securities—including shares, mutual funds, debt instruments, and other capital market products—are securely registered and managed.

Through this account, investors can review their portfolio holdings, verify ownership records, and track their investment activities with ease. Since all records are maintained electronically, transactions can be carried out more efficiently while ensuring a high level of security.

To make these services more accessible, MKK offers the e-MKK Information Portal. This online platform enables investors to access their account information, check their registration number, review portfolio details, and perform a variety of account-related activities from a single location.

 

How Does the e-MKK Information Portal Work?

 

The e-MKK Information Portal is a digital platform designed to provide investors with convenient access to their MKK records and investment information. After logging in, users can view detailed information about the capital market instruments registered in their name and monitor their accounts in real time.

Access to the portal is provided using the credentials issued through the investor's bank or authorized brokerage firm. Once authenticated, users can review their portfolio allocation, monitor account activity, and benefit from digital services such as participation in electronic general meetings.

The platform also keeps investors informed by providing notifications and updates related to their securities and other capital market activities. With instant access to reports and account information, investors can make more informed financial decisions and manage their portfolios more effectively.

 

What Is the MKK Investor Information Center?

 

The MKK Investor Information Center is a dedicated service that helps investors access reliable and up-to-date information about the MKK system and capital market procedures.

Through this service, investors can find guidance on topics such as MKK registration numbers, account opening procedures, registration processes, transaction fees, and the use of investment accounts. Information is available through both digital channels and authorized financial institutions.

In addition to procedural guidance, the Investor Information Center also offers educational resources, announcements, and informative content aimed at improving financial literacy. These resources help investors better understand the capital markets, make more informed investment decisions, and benefit from a transparent and secure investment environment.