Best data room software for mergers and acquisitions
For a company sale or acquisition, Ellty, iDeals and Datasite form our top three: each runs a structured Q&A, bidder-level permissions and watermarked viewing without workarounds. Intralinks and Ansarada follow for processes where procurement wants a long enterprise track record or deal-readiness tooling.
A sale lives or dies on how questions are routed and how each bidder is kept inside its own folders.
Security evidence
25%
Buyers and their counsel ask for certifications, watermarking and an exportable audit trail before they log in.
Speed to a working room
20%
Teaser to first-round bids often takes weeks, so the index has to be live quickly.
Cost over the full process
15%
Deals slip, and a room that bills predictably over nine months beats a cheap first quarter.
AI and review tools
10%
Summaries and smarter search shorten the time advisers spend answering repeat questions.
Q&A and bidder control carries the most weight here: A sale lives or dies on how questions are routed and how each bidder is kept inside its own folders.
dataroomreview.org
Weights for this use case only; the overall ranking uses the standard weights on our how-we-test page.
A complete transaction data room with AI tools inside it and a list price on the website.
9.2/10Outstanding
Ellty carries the full sell-side toolkit we look for in iDeals or Datasite: per-bidder permission groups, a routed question workflow, per-viewer watermarking, rights management on downloads and a full activity log. On top of that come AI features, native signing and a listed entry price of $149/mo; the 14-day free trial is enough time to stage the index before the mandate letter is signed.
What we liked
Every core diligence control on our checklist: routed Q&A, group permissions, viewer watermarks, print and download blocking, activity log
AI tools and signing are part of the product, not add-ons
Highest usability score in our ranking (9.8), with self-serve setup for admins
Watch out for
Neither SSO nor a public API at our last check
You redact outside the room, since there is no native tool
No native mobile app; reviewers use the mobile browser
A long-established transaction room with heavyweight security credentials and the highest service score in our ranking.
9.1/10Outstanding
iDeals holds both certificates (ISO 27001, SOC 2) and adds redaction, SSO and API access, which is the combination a bank or a listed buyer usually asks for in the security questionnaire. Support scores are the highest in our roster.
What we liked
ISO 27001 and SOC 2 certified, with GDPR listed
Built-in redaction alongside watermarks and document rights control
Single sign-on and a public API for IT-led deployments
Watch out for
Pricing is quoted, so you cannot model the cost before talking to sales
No native e-signature and no AI features on our checklist
The enterprise standard on banker-led sell-side deals, with ten of our twelve checklist features.
8.9/10Excellent
Datasite is the platform many investment banks already run, with redaction, a mobile app and AI features alongside the full Q&A and permission stack. Every engagement is quoted, and you get a demo rather than a trial.
What we liked
Ten of twelve checklist features, the widest coverage we track
AI features, redaction and a native mobile app
SOC 2 and ISO 27001, with GDPR listed
Watch out for
No free trial; evaluation runs through a sales demo
One of the oldest names in deal rooms, chosen for its security record in regulated transactions.
8.6/10Excellent
Intralinks has hosted transactions since 1996 and is certified to ISO 27001 as well as SOC 2. It is a dependable choice when the buyer is a regulated institution, though everyday usability trails newer rooms.
What we liked
SOC 2 and ISO 27001 certified
Redaction, watermarks and document rights control built in
Single sign-on for enterprise access control
Watch out for
No free trial and no published pricing
Usability (7.5) is among the lowest in our top ten
No AI features, e-signature, API or mobile app on our checklist
A deal room with an AI and readiness angle, certified to SOC 2 and ISO 27001.
8.6/10Excellent
Ansarada adds AI features and readiness tooling to a complete deal room with SSO, which suits sellers who want to prepare months ahead. It offers a free trial and quotes pricing on request.
A dependable, easy-to-run room popular with mid-market dealmakers and legal teams.
8.5/10Excellent
Firmex is easy for outside counsel to navigate and includes redaction, Q&A and document rights control. It lacks SSO and AI features, which matters less on a conventional process.
What we liked
Usability score of 9.0, among the best in our group
SOC 2 and ISO 27001 certified
Built-in redaction alongside watermarks and document rights control
Watch out for
No single sign-on or public API
No AI features or e-signature
Deal workflow (8.3) is a step below the enterprise rooms
Prices in USD at the entry level; indicative, confirm with the provider.
What a sale asks of the room
A company sale is a staged release of information to people you do not fully trust yet. In the first round, a dozen bidders may see a trimmed set of financials. By the second round, three or four survivors want contracts, employee data and tax workpapers, each under their own NDA terms. The data room is the tool that enforces those stages, and it has to do so without slowing the advisers who run the process.
That is why we weight Q&A and bidder control more heavily here than anywhere else on the site. A seller’s adviser fielding several hundred questions needs each one tagged to a workstream, routed to the right expert inside the company, approved before release and visible only to the bidder who asked. Rooms built for general file sharing rarely get this right, which is why Box, ShareFile and DocSend do not appear on this page even though they score well in other contexts.
How we ranked the picks
Each provider’s position comes from our six-criteria review score, re-weighted for M&A using the priorities shown on this page. Deal workflow and security posture carry most of the weight. Usability counts because external counsel and bidder teams are not trained on your platform. Pricing clarity matters because a delayed close can double the term of a room. Our review method explains each criterion in full.
Provider
Our score
Q&A
Redaction
SSO
AI features
E-signature
Entry price
Ellty
9.2
Yes
No
No
Yes
Yes
$149/mo
iDeals
9.1
Yes
Yes
Yes
No
No
Quote
Datasite
8.9
Yes
Yes
Yes
Yes
No
Quote
Intralinks
8.6
Yes
Yes
Yes
No
No
Quote
Ansarada
8.6
Yes
No
Yes
Yes
No
Quote
Firmex
8.5
Yes
Yes
No
No
No
Quote
The table shows why there is no single winner for every mandate. If the buyer’s IT team insists on single sign-on, Ellty and Firmex need a conversation first. If you want to draft summaries of long contracts inside the room, iDeals, Intralinks and Firmex do not offer AI features natively. Our Ellty vs iDeals and iDeals vs Datasite pages go line by line.
Mistakes we see on sell-side processes
The most common error is building the index in a shared drive and migrating late. Folder numbering breaks, permissions are rebuilt in a hurry and the first bidders arrive to a half-finished room. Upload early, even if only the top-level structure is ready.
The second is treating Q&A as email. When questions arrive in inboxes, nobody can prove which bidder received which answer, and warranty negotiations later become harder. Every pick on this page has a Q&A module; use it from the first question.
The third is underestimating the tail. Rooms often stay open after signing for completion mechanics and disclosure letter disputes. Ask each vendor what archive and export options cost before you sign.
Before you sign
Ask for the security documentation your likely buyers will request, whether that is a SOC 2 report, an ISO 27001 certificate or both, and check it matches the hosting region you need. Changing provider mid-process is far more painful than asking an awkward question during the trial.
Budget notes
Among the six picks, only Ellty publishes an entry price ($149/mo). iDeals, Datasite, Intralinks, Ansarada and Firmex quote per project, and the quote typically depends on document volume, number of administrators and term. Ask every vendor to quote the same scope: same months, same storage, same admin seats. Our pricing guide has a calculator that models term and seat counts side by side.
1
Write the access map
List bidder groups, internal teams and advisers, and what each should see in round one and round two.
2
Pick two contenders
Use the table above to cut the field to two rooms that meet your certification and integration needs.
3
Rebuild a real slice
Upload one workstream of real documents into each trial and invite a colleague as a mock bidder.
4
Run ten test questions
Send questions through Q&A, route them to an expert, approve and release. Note where the flow slows you down.
5
Compare like-for-like quotes
Ask for the same term and scope from both vendors and include archive costs at close.
If you are buying rather than selling, the same rooms apply, but you will usually work inside the seller’s choice. In that case our due diligence shortlist focuses on what a reviewing team needs from the other side of the screen. Not sure which profile fits your process? The data room quiz narrows it down in five questions.
Frequently asked questions
Which data room is best for a company sale?
On our scores, Ellty (9.2), iDeals (9.1) and Datasite (8.9) lead for M&A. All three include structured Q&A, granular permissions, dynamic watermarking and a full audit trail. The choice between them usually turns on certifications, integrations and how you want to pay.
Do I need ISO 27001 for an M&A data room?
Not always, but many corporate buyers ask for it by name. iDeals, Datasite, Intralinks, Ansarada and Firmex hold ISO 27001. Ellty lists SOC 2 (infrastructure), so check your buyer questionnaire before you shortlist.
How long does an M&A data room stay open?
Most sell-side rooms run three to nine months from preparation to closing, and some stay open after completion for warranty claims. Budget for the longer end; our pricing guide shows how term changes the total.
Can buyers see each other in the data room?
Not if permissions are set up properly. Every room in this list supports permission groups, so each bidder sees only its own folders and its own Q&A thread.
