An IPO room has to satisfy underwriters, auditors and several law firms at once, under tight confidentiality. Ellty, Datasite and Intralinks lead our ranking, with iDeals and Venue by DFIN as strong options when listing compliance drives the choice.
Pre-listing information is price-sensitive, so access, watermarks and download limits must be tight.
Multi-party diligence
25%
Underwriters, auditors and several counsel teams review in parallel and need separate permission groups.
Security evidence
25%
Banks and their counsel expect certifications and a defensible audit trail.
Long-run cost
20%
IPO preparation can stretch beyond a year, so monthly cost compounds.
Confidentiality controls carries the most weight here: Pre-listing information is price-sensitive, so access, watermarks and download limits must be tight.
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 runs underwriter and counsel diligence with the controls a listing demands: group permissions, routed questions, watermarking per viewer, rights control and a full log of every view. AI features speed up review of long contracts and board minutes. Pricing is listed at $149/mo with a 14-day free trial, which helps when the company wants to start organising long before banks are mandated.
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
One of the oldest names in deal rooms, chosen for its security record in regulated transactions.
8.6/10Excellent
Intralinks has decades of experience in capital markets work and holds SOC 2 and ISO 27001, with SSO and redaction. Day-to-day usability is behind 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 compliance-minded transaction room from DFIN, aimed at IPOs and capital markets deals.
7.2/10Fair
Venue by DFIN comes from a financial filings company and covers Q&A, redaction and document rights control. It scored lowest on usability among these picks, so plan for training.
What we liked
ISO 27001 and SOC 2 certification
Built-in redaction alongside Q&A, watermarking and document rights control
Positioned around IPOs, capital markets and compliance-heavy work
Watch out for
No published price; every project is quoted
Everyday usability scored 6.0, the lowest in our roster
No two-factor login, single sign-on or public API listed
Prices in USD at the entry level; indicative, confirm with the provider.
An IPO is a crowded room
A private company sale usually has one seller team and a handful of bidders. An IPO has the issuer, two or more underwriting banks, issuer’s counsel, underwriters’ counsel, auditors and sometimes specialist advisers on tax, IP or industry regulation. Each group needs different documents, and some need to stay apart. Information is also unusually sensitive: until the prospectus is public, a leak can move valuations and trigger regulatory questions.
That combination is why we weighted confidentiality controls and multi-party diligence most heavily on this page.
How the picks stack up
Provider
Score
Redaction
SSO
AI features
ISO 27001
Trial
Ellty
9.2
No
No
Yes
No (SOC 2, infrastructure)
14 days
Datasite
8.9
Yes
Yes
Yes
Yes
Demo
Intralinks
8.6
Yes
Yes
No
Yes
Demo
iDeals
9.1
Yes
Yes
No
Yes
Yes
Venue by DFIN
7.2
Yes
No
No
Yes
Demo
Our scoring starts from the six-criteria review score and re-weights it for listing work. Ellty ranks first because it combines the full diligence toolkit with AI features, high usability and transparent cost over a long preparation period. Datasite and Intralinks are close behind and familiar to many banks, which can matter if underwriters have a preference. Where redaction and SSO are firm requirements, they and iDeals cover both natively. The Datasite vs Intralinks page compares the two incumbents directly.
Steps that make IPO diligence smoother
1
Map every adviser group
List issuer counsel, underwriter counsel, each bank, auditors and specialists, and decide what each group may see.
2
Build the index from the diligence request list
Ask underwriters' counsel for their request list early and mirror its numbering in the folder structure.
3
Set strict defaults
Turn on watermarks for every group and restrict downloads on board minutes, forecasts and pending litigation.
4
Run Q&A through the room
Route every diligence question through the Q&A module so answers are logged against the right party.
5
Plan the archive
Agree how the final room will be exported and retained after listing, since it may support future disclosure questions.
Common mistakes
Mixing board materials into the diligence room is the one we see most. Board packs discuss valuation and strategy in ways not meant for every adviser. Share only what the request list asks for, in a separate folder with its own permissions.
Another is leaving advisers’ access open after their work finishes. When an engagement ends, remove the group. It shortens the audit trail you will need to explain later.
Check your underwriters' preference
Banks sometimes have house preferences for a data room. Ask early. If they prefer a platform you did not plan to use, weigh the cost of switching against the familiarity they bring.
After the listing
The room does not become irrelevant on listing day. Post-listing, companies face continuing disclosure obligations, and questions about what advisers reviewed before the prospectus was published can resurface in litigation or regulatory enquiries. Keep the final diligence set and the full activity log in an export you control. Some companies keep a slimmed-down room open for the first year as a reference for the finance and legal teams. Agree retention with counsel and make sure the provider’s archive terms support it.
Budget notes
IPO preparation is long, so monthly cost matters. Ellty publishes an entry price of $149/mo; over a twelve-month preparation that comes to about $1,800 before add-ons. Datasite, Intralinks, iDeals and Venue by DFIN quote per project and often price by volume and term. Ask for a quote that covers the full preparation period plus a post-listing archive. See the pricing guide for how term and volume change quotes, and the enterprise shortlist if group IT requirements will shape the decision.
Frequently asked questions
Do companies need a data room for an IPO?
In practice yes. Underwriters and their counsel run detailed due diligence, and a data room keeps documents organised, controls access by party and records what each adviser reviewed.
Which data room is best for going public?
On our scores Ellty, Datasite and Intralinks lead for IPO work. Datasite and Intralinks are familiar to many underwriters; Ellty adds AI features and a listed price. iDeals and Venue by DFIN are also worth a look.
How long does an IPO data room stay open?
Preparation often starts twelve to eighteen months before listing, and the room may stay open through the quiet period and beyond for post-listing obligations. Budget for a long term.
Should the IPO room be separate from the board portal?
Usually yes. Board materials and diligence materials have different audiences. Keeping them apart avoids accidental exposure of board discussions to outside advisers.
