Signature on a Share Transfer Agreement Is Disputed in Turkey: How Is Authenticity Proven? 2026 Updated Guide

What happens when a signature on a Turkish share transfer agreement is denied? Learn how signature authenticity is examined, which comparison signatures are used, how expert reports work and what evidence companies and shareholders should preserve.

A dispute over the signature appearing on a share transfer agreement in Turkey can determine whether a multimillion-value corporate transaction is enforceable. One party may claim that they never signed the agreement, that their signature was forged, that a document was completed after signature, or that the document presented to the court differs from the version actually executed.

The dispute should not be reduced to visually comparing two signatures. Under Turkish civil procedure, denial of a signature on a private document triggers a specific authenticity examination. Turkish appellate case law emphasizes comparison with reliable signature samples and, where necessary, technically adequate expert examination using graphological and graphometric methods.

For shareholders, foreign investors and companies involved in a Turkish corporate dispute, preserving the original agreement and reliable contemporaneous signature samples can therefore become critical.

Why Do Signature Disputes Arise in Share Transfers?

A signature dispute may arise where a shareholder alleges that the agreement was forged, a former director signed without authority, signature pages were replaced, a blank document was completed later, electronic copies differ from the original, or the agreement was allegedly created after the corporate relationship deteriorated.

The first question is therefore simple but decisive: Is the disputed signature genuinely the signature of the person to whom it is attributed?

Signature Authenticity and Authority to Sign Are Different Questions

Two issues should not be confused.

The first is whether the individual physically signed the agreement.

The second is whether that individual had legal authority to execute the transaction.

A signature can be genuine while the signatory lacked corporate authority. Conversely, an authorized director’s name may appear on a document containing a forged signature.

Both issues may therefore require separate examination.

What Happens When a Signature Is Denied?

Under the Turkish Code of Civil Procedure, a party seeking to deny handwriting or a signature attributed to them must raise the falsity issue. For a private document, once the signature is denied, the document cannot generally be relied upon until the authenticity question has been resolved.

This can have major consequences where the disputed agreement is the principal evidence supporting the alleged share transfer.

Who Must Prove That the Signature Is Authentic?

Where the signature on the agreement is properly denied, the party relying on the private document may need to establish its authenticity. A 2026 regional appellate decision concerning a disputed contract expressly applied this principle and required examination under the procedure prescribed by the Code of Civil Procedure.

Accordingly, merely producing a photocopy carrying what appears to be the shareholder’s signature may not resolve the dispute.

The Original Share Transfer Agreement Is Extremely Important

The original document should be preserved immediately.

Handwriting and forensic-document examination can involve characteristics that may not be adequately visible in an ordinary scanned PDF or photocopy.

Companies should therefore avoid writing on, stapling through, damaging or otherwise altering an original disputed agreement.

Can the Court Examine the Signature Itself?

Turkish civil procedure provides a structured examination.

The court may first hear the person denying the signature and obtain handwriting or signature specimens. If the court cannot reach a sufficiently reliable conclusion through that process and the other available evidence, expert examination becomes relevant.

Expert Examination Can Become Decisive

Where specialist knowledge is necessary, handwriting and document experts may examine whether the disputed signature was produced by the person concerned.

Turkish higher-court decisions emphasize that such examination should be technically detailed and capable of judicial review rather than based merely on superficial visual similarity.

What Does a Signature Expert Examine?

The examination can consider characteristics such as the formation and movement of the signature, pressure, inclination, direction and other individual writing features.

The purpose is not simply to determine whether two signatures “look similar.”

A forged signature can visually resemble an authentic signature while differing in characteristics revealed through technical examination.

Comparison Signatures Are Critical

The reliability of the expert examination depends heavily on the comparison material.

Turkish case law emphasizes using reliable signatures belonging to the person concerned, particularly specimens from before the date of the disputed document and, where possible, specimens close to that date.

Which Documents Can Be Used for Comparison?

Depending on the case, potentially useful comparison material may include signatures appearing on notarial documents, official applications, banking documentation, corporate records or other documents whose authenticity can reliably be established.

The objective is to obtain genuine specimens that provide a sound basis for technical comparison.

Recent Signatures Alone May Be Insufficient

A shareholder’s signature can evolve over many years.

For this reason, a signature produced today should not automatically be treated as the ideal comparison for an agreement allegedly signed years earlier.

Documents close to the agreement date can be especially valuable.

Court-Obtained Signature Samples May Also Be Used

The court may obtain handwriting or signature specimens directly from the person denying the signature as part of the statutory examination procedure.

These specimens can then be considered together with reliable historical material.

What If the Expert Report Is Inconclusive?

An inconclusive report does not necessarily end the dispute.

The parties should examine whether sufficient comparison material was available, whether originals were examined, whether the methodology was adequately explained and whether the conclusions are technically supported.

Additional or renewed expert examination may become necessary where a report is inadequate.

What If Two Expert Reports Contradict Each Other?

Contradictory reports require particularly careful treatment.

Turkish case law contains disputes in which different expert bodies reached conflicting conclusions concerning the same signatures. Courts must evaluate whether the contradiction has been adequately resolved before relying on expert evidence.

A party should therefore challenge a contradictory or technically inadequate report with specific objections rather than merely stating that it disagrees.

Digital Copies Can Still Be Important Evidence

Emails containing the agreement, scanned copies, document-management records and electronic correspondence can help reconstruct the transaction.

They may show when drafts circulated, who received the final version and whether the disputed agreement existed in its alleged form at the relevant time.

Examine the Email Chain

If negotiations occurred by email, preserve the entire chain rather than individual screenshots.

The chronology may show that the alleged signer reviewed drafts, requested amendments, approved commercial terms or received a completed agreement.

However, evidence of negotiations does not automatically prove that the final signature is genuine.

Messaging Records May Be Relevant

Messages exchanged before and after the alleged transfer may help establish the surrounding circumstances.

For example, discussions about payment of the purchase price, delivery of corporate records or completion of the transfer can provide contextual evidence.

Their evidentiary value should nevertheless be assessed separately from forensic signature authenticity.

Payment Evidence Can Be Extremely Important

If the alleged buyer paid the agreed share price and the alleged seller received it, bank records may support the broader transaction narrative.

Conversely, absence of any expected payment may support questions concerning whether the transaction occurred as alleged.

Payment evidence still does not replace signature examination where authenticity is directly disputed.

Examine Corporate Records

Company records may reveal whether the parties acted consistently with the alleged transfer.

Depending on the company type and transaction, relevant evidence may include corporate resolutions, shareholder records, management documents, applications and other transaction documentation.

Corporate Formalities Must Be Examined Separately

Even where the signature on a contractual document is genuine, the legal effectiveness of a share transfer can depend on the company type and applicable mandatory formalities.

A signature-authenticity finding therefore does not necessarily resolve every question concerning whether ownership of the shares legally changed.

What If the Signature Is Genuine but the Text Was Added Later?

This is a different allegation from ordinary signature forgery.

A person may accept that the signature belongs to them but argue that they signed a blank or materially different document and that contractual provisions were subsequently inserted or changed.

The investigation must then address not only who signed, but also what document existed when the signature was placed on it.

Examine Physical Alterations

Where relevant, forensic examination may address alterations, additions, different printing processes or other physical characteristics of the document.

The original becomes particularly important in such cases.

Metadata Can Support the Chronology

Electronic versions may contain creation, modification or transmission information.

Metadata should be preserved carefully and interpreted in context because copying or exporting a document can itself change certain metadata fields.

Preserve Company Servers and Accounts

If litigation is anticipated, relevant company email accounts, document repositories and electronic records should be preserved.

Deleting old correspondence after a dispute begins can make reconstruction of the transaction considerably more difficult.

Witness Evidence May Provide Context

Individuals who attended the signing or participated in negotiations may have relevant knowledge.

Witness testimony can help explain the circumstances surrounding execution, although technical signature authenticity may still require documentary and expert evidence.

Notarial Evidence Can Be Particularly Valuable

Notarial records can provide reliable comparison material and may also establish aspects of the transaction chronology.

The legal significance of notarization, however, depends on what precisely the notary certified or recorded.

What If the Signature Belongs to a Company Director?

The investigation should first establish authenticity and then examine representation authority.

Review the company’s representation structure as it existed on the transaction date, including any limitations or joint-signature requirements relevant to the dispute.

What If Someone Signed on Behalf of the Shareholder?

Determine whether a valid power of attorney or another legally sufficient authority existed.

The authenticity and scope of the authorization may itself become disputed.

Foreign Shareholders Require Additional Evidence Planning

Where a foreign shareholder allegedly signed documents outside Turkey, obtain the original foreign execution documents and reliable historical signature specimens as early as possible.

Cross-border document collection can otherwise delay the proceedings substantially.

Criminal Proceedings May Also Arise

A forged share transfer agreement may potentially create criminal-law issues in addition to the commercial dispute, depending on the facts and nature of the document.

Civil and criminal proceedings should nevertheless be treated as distinct proceedings with their own evidentiary and procedural consequences.

A Criminal Case Does Not Automatically Decide Every Civil Issue

Evidence and expert reports obtained in criminal proceedings can become highly relevant, but the commercial court must address the civil dispute under the applicable procedural framework.

The existence of a criminal investigation should therefore not cause the company to neglect its civil evidentiary strategy.

What If the Agreement Was Used to Change Company Control?

Immediate protective measures may need to be evaluated where the disputed agreement is being used to exercise voting rights, transfer corporate assets, change management or dispose of valuable company property.

Waiting until the authenticity litigation ends may create irreversible commercial consequences.

Interim Measures May Be Necessary

Depending on the facts and legal requirements, the affected shareholder may need to evaluate interim judicial protection designed to preserve the existing position until the dispute is resolved.

The requested measure should be proportionate to the specific risk.

Preserve the Transaction File Immediately

Once authenticity is disputed, collect the original agreement, drafts, emails, messages, bank transfers, corporate resolutions, shareholder records, powers of attorney, courier records and reliable historical signature specimens.

Evidence preservation should begin before litigation whenever possible.

Immediate Legal Strategy

A shareholder facing a disputed signature on a Turkish share transfer agreement should immediately secure the original document, formally raise the signature dispute through the appropriate procedure, identify reliable historical comparison signatures, preserve electronic communications and payment records, investigate corporate formalities and representation authority, request technically adequate expert examination where necessary and consider interim protection if the disputed document is being used to change company control or dispose of assets.

Frequently Asked Questions

What happens if a shareholder denies signing a share transfer agreement?

The authenticity of the signature may need to be determined under the Turkish procedural rules governing disputed private documents.

Can the disputed agreement still be used as evidence?

For a private document whose signature is properly denied, Turkish civil procedure restricts reliance on the document until the authenticity issue is resolved.

How is signature authenticity determined?

The court can evaluate the party’s explanation and obtain signature specimens and, where necessary, order expert examination using reliable comparison signatures.

Which signatures are best for comparison?

Reliable signatures from documents close to—and particularly preceding—the date of the disputed agreement are important comparison material under Turkish case law.

Is visual similarity enough?

Not necessarily. Higher-court decisions emphasize technically adequate graphological and graphometric examination where specialist analysis is required.

Can emails prove that the agreement was signed?

Emails can provide strong contextual evidence concerning negotiations and transaction chronology, but they do not automatically establish that a disputed handwritten signature is authentic.

What if the signature is genuine but the shareholder says the document was altered afterward?

The dispute then extends beyond signature authenticity to the content and physical or electronic history of the document.

Can contradictory expert reports be challenged?

Yes. The methodology, comparison samples, technical reasoning and contradictions between reports should be examined carefully.

Can a forged share transfer agreement lead to criminal proceedings?

Potentially, depending on the circumstances and nature of the alleged conduct.

What should a foreign investor do first?

Secure the original agreement and collect reliable signature specimens from around the transaction date. At the same time, preserve emails, payment records, corporate documents and other evidence capable of reconstructing exactly how the alleged share transfer occurred.

Client-Focused Legal Support for Share Transfer and Signature Disputes in Turkey

Disputed share-transfer signatures can involve forensic document examination, shareholder ownership, company control, payment claims, interim measures, corporate authority and potential criminal allegations. Fırat Fesih Kaya Law Office assists foreign shareholders, investors and companies in Turkish share transfer and corporate disputes. Lawyer Fırat Fesih Kaya provides legal assistance in challenging or defending disputed agreements, coordinating signature and document examination, preserving corporate and electronic evidence, addressing shareholder-control disputes and pursuing appropriate judicial remedies.

Phone:
+90 312 434 22 22

Mobile:
+90 532 769 22 22

Email:
info@firatfesihkaya.av.tr

Address:
Mevlana Boulevard No:221, Yıldırım Tower, Office No:148
06520 Balgat, Çankaya, Ankara, Turkey