Is an electronic signature valid?

Yes. Electronic signatures are generally enforceable under the ESIGN Act (15 U.S.C. ch. 96) and UETA where adopted, provided intent, consent, attribution, and record retention requirements are met.

When is notarization required?

Notarization is required if the addendum affects recordable instruments or if the original contract or local law requires it; recording offices often expect notarized signatures for real estate matters.

Can I use a template for multiple deals?

Yes. Use a standardized template with fillable fields for changes, but review unique commercial terms and applicable law before reuse to avoid overlooking transaction-specific contingencies.

What happens if the wrong party signs?

If an unauthorized signatory executes the addendum, the document may be voidable; obtain ratification from the proper corporate authority or reexecute with authorized signers.

How should addenda be stored?

Store executed PDFs with an audit trail, keep originals per retention policy, and ensure secure backups with encryption and role-based access for compliance and discovery readiness.

Can an addendum change governing law?

Yes, but changing governing law may require mutual consent and could affect enforcement; if included, clearly state the new governing jurisdiction and have counsel review conflicts.

Electronic Signature
Templates
Legal
Acquisition Contract Addendum

Acquisition Contract Addendum

This template is fully customizable. Edit the text, fill out the fields, and send it for signature. Give it a try!

ACQUISITION CONTRACT ADDENDUM

This Acquisition Contract Addendum ("Addendum") is made effective as of Effective Date: by and between Acquirer Name: with principal address at Acquirer Address: and Seller Name: with principal address at Seller Address: (each a "Party" and together the "Parties").

RECITALS

WHEREAS, the Parties entered into that certain Acquisition Agreement dated: entitled: (the "Agreement"); and

WHEREAS, the Parties desire to amend certain provisions of the Agreement to reflect adjustments to the purchase structure and closing conditions as set forth below; and

WHEREAS, capitalized terms used but not defined in this Addendum shall have the meanings given to them in the Agreement unless otherwise provided herein.

NOW, THEREFORE, in consideration of the mutual promises contained herein and other good and valuable consideration, the Parties agree to amend the Agreement as follows.

1. DEFINITIONS

For purposes of this Addendum, the following definitions shall apply. "Agreement" means the Acquisition Agreement referenced above as amended by this Addendum. "Closing" means the consummation of the transactions contemplated by the Agreement as modified herein. Any capitalized term used in this Addendum and not defined herein shall have the meaning assigned to such term in the Agreement.

2. AMENDMENT TO PURCHASE PRICE

Section entitled "Purchase Price" of the Agreement is hereby amended to the extent set forth in this Section. The Purchase Price shall be adjusted by an amount equal to Purchase Price Adjustment: , resulting in a new aggregate purchase consideration of New Aggregate Purchase Price: . The Parties acknowledge and agree that such adjustment constitutes a definitive amendment to the calculation of all contingent payments and adjustments described in the Agreement.

Allocation of the Purchase Price for tax and financial reporting purposes shall be performed in accordance with the schedule attached hereto as Schedule A and by reference incorporated herein. Allocation Schedule Reference:

3. CLOSING DATE AND CONDITIONS

The Closing shall occur on New Closing Date: (the "New Closing Date"), or at such other date and time as the Parties may mutually agree in writing. All references in the Agreement to the Closing Date shall be deemed amended to refer to the New Closing Date.

The obligations of each Party to consummate the transactions on the New Closing Date are subject to the satisfaction (or waiver in writing) on or before the New Closing Date of the following additional conditions precedent: (a) delivery of updated financial statements and working capital worksheet acceptable to the Parties; (b) receipt of required third-party consents listed in Additional Consents: ; and (c) clearance of any material outstanding title or lien issues described in Outstanding Title Matters: .

4. REPRESENTATIONS AND WARRANTIES

Each Party hereby reaffirms and restates the representations and warranties made in the Agreement as of the date of this Addendum, except to the extent such representations and warranties are expressly modified herein. Each Party further represents that, as of the Effective Date, to its knowledge, there has been no material adverse change in its business, operations or condition that would reasonably be expected to prevent such Party from performing its obligations under the Agreement as amended.

The Parties agree that the representations and warranties set forth in the Agreement shall survive Closing for a period of Survival Period (years): years, except for those representations and warranties that by their terms survive for a different period.

5. COVENANTS

From the Effective Date until the New Closing Date, each Party shall, and shall cause its Affiliates to, operate in the ordinary course of business and shall comply with all covenants set forth in the Agreement, subject to the express modifications contained in this Addendum. Specific additional covenants agreed by the Parties are set forth below and in Section 6.

Additional Covenants and Operational Commitments

6. INDEMNIFICATION

The indemnification provisions of the Agreement shall remain in full force and effect except as modified herein. The Parties agree that the aggregate liability for indemnification claims asserted by one Party against the other shall not exceed Indemnity Cap: unless arising from willful misconduct or fraudulent misrepresentation.

For clarity, indemnity claims shall be governed by the procedures set forth in the Agreement and any notices asserting an indemnity claim must specify the nature of the claim and the estimated amount of loss in reasonable detail.

7. NOTICES

All notices, demands, or communications required or permitted under this Addendum shall be given in writing and delivered in accordance with the notice provisions of the Agreement, and shall be sent to the addresses specified below (or to such other address as a Party may designate by written notice).

Acquirer Notice Name Acquirer Notice Address Seller Notice Name Seller Notice Address

8. GOVERNING LAW

This Addendum shall be governed by and construed in accordance with the laws of Governing State: , without regard to its conflicts of law principles. The Parties submit to the exclusive jurisdiction of the courts located in that state for any dispute arising out of or related to this Addendum.

9. ENTIRE AGREEMENT; SEVERABILITY

This Addendum, together with the Agreement and any exhibits or schedules hereto or thereto expressly referenced, constitutes the entire agreement between the Parties with respect to the subject matter hereof and supersedes all prior negotiations, representations or agreements, whether written or oral, with respect to such subject matter. If any provision of this Addendum is held to be invalid, illegal or unenforceable, the remaining provisions shall remain in full force and effect.

10. AMENDMENTS; WAIVER; COUNTERPARTS

No amendment, modification or waiver of any provision of this Addendum shall be effective unless made in writing and signed by the Parties. Failure to enforce any right or remedy shall not constitute a waiver of such right or remedy. This Addendum may be executed in counterparts, each of which shall be deemed an original and all of which together shall constitute one and the same instrument. Electronic or facsimile signatures shall have the same force and effect as original signatures.

11. MISCELLANEOUS

Except as expressly amended by this Addendum, all terms and provisions of the Agreement shall remain in full force and effect. In the event of any conflict between the terms of this Addendum and the Agreement, the terms of this Addendum shall control.

Additional Terms or Schedules

Acquirer:

By:

Date:

Seller:

By:

Date:

What an Acquisition Contract Addendum Is

An Acquisition Contract Addendum is a written amendment to an existing purchase or acquisition agreement that documents specific changes without replacing the base contract. It typically identifies the original agreement by title and date, names the parties, and lists discrete modifications such as price adjustments, delivery or closing date changes, added contingencies, or revised representations and warranties. Proper drafting uses numbered clauses, clear cross-references to the original contract, and an execution block showing signatures and dates to ensure the amendment is integrated into and enforceable alongside the original agreement.

Why Use an Addendum Instead of a New Agreement

An addendum records targeted changes quickly while preserving the original contract’s framework. It reduces rework, preserves negotiated terms that remain unchanged, creates a clear amendment trail, and limits negotiation scope to specified clauses and effective dates.

Who Typically Prepares and Signs an Addendum

The addendum is signed by authorized representatives from each party and retained alongside the original agreement for enforcement and audit purposes.

Buyers and sellers needing to modify price, timelines, or conditions during an active acquisition or closing process.
Corporate counsel and outside attorneys who draft precise amendment language and confirm legal effect under governing law.
Transaction managers, brokers, or closing agents who coordinate approvals, signatures, and distribution across parties.

Typical Signatory Roles

General Counsel

General counsel or corporate counsel typically approves legal language, confirms that the amendment is consistent with corporate authority, and documents board or officer approvals when required for enforceability.

Authorized Officer

A named officer or signatory with delegated authority executes the addendum on behalf of the company; confirm signature authority in corporate records before relying on the amendment.

Core Elements to Include in Every Addendum

A professional Acquisition Contract Addendum is concise but precise: reference the original agreement, list changes, state the effective date, and show signatures. Include any payment terms or conditions necessary to implement the amendment.

Reference

Cite the original agreement by full title and execution date so the amendment is unambiguously tied to the base contract and enforceable as part of the transaction file.

Scope

Specify exactly which sections, exhibits, or provisions are changed, removed, or added; use clause numbers and strike/insert language where helpful for clarity.

Effective Date

State the precise effective date for the amendment and indicate whether changes are retroactive, prospective, or conditional upon a future event.

Consideration

If the amendment alters consideration, describe the new amount, payment timing, and any security, escrow, or setoff terms needed to implement the change.

Signatures

Include signature blocks for each party with printed name, title, company, and date; note notarization or witness requirements if state law or the original agreement requires them.

Integration

Add a clause confirming that all other terms remain in effect except as expressly modified, to prevent unintended contract fragmentation or ambiguity.

Step-by-Step: Prepare and Execute an Addendum

Follow a clear sequence to draft, review, and finalize the addendum to limit disputes and processing delays.

01

Review: Verify the base contract and identify clauses to change.
02

Draft: Prepare amendment language and cite original clause numbers.
03

Approve: Obtain internal approvals and confirm signatory authority.
04

Execute: Sign, notarize if required, and distribute executed copies.

Configuring a Digital Workflow for an Addendum

Set up a repeatable e‑workflow to collect approvals, signatures, and final copies without manual handoffs.

Field	Configuration
Signer Order	Sequential or parallel, depending on required approvals.
Authentication	Email link, SMS code, or stronger ID verification.
Template	Save addendum as reusable template with editable fields.
Notifications	Set reminders and completion copies for all parties.

Typical eSignature Flow for an Addendum

A streamlined electronic process reduces turnaround and preserves an audit trail for enforceability under ESIGN and UETA.

Upload: Add the base agreement and the amendment draft.
Place Fields: Insert signature, initial, and date fields.
Send: Route by signer order or share a signing link.
Record: Store executed PDF and audit trail securely.

Platform and File Requirements for Digital Execution

Confirm the vendor supports HIPAA or 21 CFR Part 11 if your addendum affects regulated data, and ensure secure storage with TLS and AES encryption.

File Types: PDF or Word DOCX preferred.
Authentication: Email, SMS, or KBA options available.
Integrations: Connectors for CRMs and storage.

Comparing eSignature Options for Addendum Execution

Common vendor features and starting prices vary; signNow appears first for straightforward, compliance-focused electronic execution options.

	signNow	DocuSign	Adobe Sign	PandaDoc	HelloSign
Starting Price	$8/user/mo	$15/user/mo	$14/user/mo	$19/user/mo	$15/user/mo
Free Trial	7-day free trial	Varies by plan	Varies by plan	Varies by plan	Varies by plan
Bulk Send	Yes	Yes	Yes	Yes	No
Audit Trail	Yes	Yes	Yes	Yes	Yes
HIPAA Compliant	Yes	Yes	Yes	No	No

Security and Compliance Considerations

Encryption: TLS 1.2/1.3 in transit; AES-256 at rest

Certifications: SOC 2 Type II, ISO 27001

Regulatory: ESIGN and UETA compliant

HIPAA: BAA required for PHI workflows

21 CFR: 21 CFR Part 11 support available

Accessibility: WCAG 2.0 Level AA support

Key Risks of an Incorrect or Missing Addendum

Unenforceability: Ambiguous changes may be unenforceable

Recording Delay: Missing notarization can delay recording

Authority Errors: Unauthorized signers can void amendment

Tax Exposure: Incorrect tax treatment creates liabilities

Contract Conflict: Unclear integration risks disputes

Privacy Violations: Noncompliant PHI changes risk HIPAA penalties

Common Preparation Mistakes to Avoid

Failing to reference the original agreement precisely, which creates ambiguity about what the addendum changes and may lead to enforcement disputes.
Using vague language such as 'reasonable efforts' instead of specific dates, amounts, or metrics, which invites dispute over performance expectations.
Not verifying signatory authority or corporate approvals prior to execution, exposing the amendment to later challenge or ratification requirements.
Forgetting to confirm notarization or witness requirements before signing, causing recording delays or rejection by county clerks.

Practical Tips for Cleaner, Faster Execution

Apply a few consistent drafting and process controls to reduce rework and legal risk when preparing an addendum.

Reference the Original

Start by quoting the exact title and date of the agreement being amended to avoid ambiguity, and include the original party names so the addendum attaches clearly to existing records.

Be Specific

Replace entire clauses or provide tracked replacement text rather than using summary statements; specific language minimizes later interpretation disputes and simplifies review.

Confirm Authority

Check corporate resolutions or board minutes for signature authority and, when required, attach an officer’s certificate or power of attorney to document delegation.

Preserve Records

Distribute executed copies to all parties, store a certified PDF with the audit trail, and record with local authorities if the subject matter affects real property.

Real-World Addendum Examples

These brief case arcs show how parties use addenda to resolve narrow transaction issues while keeping the original agreement intact.

Martin Properties (Real Estate)

When a buyer requested a two-week closing extension due to financing delays, the parties executed a short addendum documenting the new closing date.

The addendum specified the revised date and limited waiver of liquidated damages.
The result preserved the original purchase terms while preventing termination and allowed the buyer to close under revised timing without full renegotiation.

Fertility Centers of Illinois (Healthcare)

A provider and vendor needed to change data sharing terms for a specific clinic location without altering the master agreement.

The addendum added a narrowly scoped data handling clause and confirmed PHI safeguards.
Execution included a BAA amendment and retained the audit trail, keeping HIPAA compliance explicit and avoiding a full contract rewrite.

Key Milestones in an Addendum Lifecycle

Track milestone stages from drafting through recording so parties meet timing and compliance obligations.

01

Drafting Complete

Amendment language finalized and internal review begins.

02

Internal Approval

Legal and authorized officers sign off on final text.

03

Execution

Parties sign, notarize if required, and date the addendum.

04

Recording/Distribution

Execute recording or distribute executed copies and system retention.

Frequently Asked Questions

Answers to common questions about drafting, signing, and enforcing Acquisition Contract Addenda.

Need help? Contact support

Is an electronic signature valid?
Yes. Electronic signatures are generally enforceable under the ESIGN Act (15 U.S.C. ch. 96) and UETA where adopted, provided intent, consent, attribution, and record retention requirements are met.
When is notarization required?
Notarization is required if the addendum affects recordable instruments or if the original contract or local law requires it; recording offices often expect notarized signatures for real estate matters.
Can I use a template for multiple deals?
Yes. Use a standardized template with fillable fields for changes, but review unique commercial terms and applicable law before reuse to avoid overlooking transaction-specific contingencies.
What happens if the wrong party signs?
If an unauthorized signatory executes the addendum, the document may be voidable; obtain ratification from the proper corporate authority or reexecute with authorized signers.
How should addenda be stored?
Store executed PDFs with an audit trail, keep originals per retention policy, and ensure secure backups with encryption and role-based access for compliance and discovery readiness.
Can an addendum change governing law?
Yes, but changing governing law may require mutual consent and could affect enforcement; if included, clearly state the new governing jurisdiction and have counsel review conflicts.

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