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Which firms provide outsourced controller services?

Outsourced Controller and Bookkeeping: The Firms The Shortlist Report Finds

4 firms lead, appearing in 18.7–23.9% of 380 AI responses. The sample cannot separate them, so we do not pretend it can.

The Shortlist Report · Published · Updated

Four firms lead

Etisson, BPM, AccountingDepartment.com and Genpact come up most often here. They are close enough together that the order between them is not worth reading anything into.

  1. Etisson91 of 380

    Provides outsourced controller services including month-end close, financial reporting, reconciliations, and budgeting, primarily for CPA firms.

  2. BPM88 of 380

    Provides fractional and interim controller services and broader outsourced accounting for mid-market companies with complex needs.

  3. AccountingDepartment.com76 of 380

    Provides outsourced accounting, bookkeeping, controller support, and tax coordination for growth-stage companies roughly $2M–$50M revenue.

  4. Genpact71 of 380

    High-volume finance and accounting outsourcing and transformation for large enterprises and global operations.

380ChatGPT responses
10Firms named
1Question asked
Last measured

Based on 380 ChatGPT responses to this question, collected August 8, 2026–October 29, 2026. Firms are counted once per response. How we measure.

The ranking

Share = the percentage of the 380 responses that named the firm. Bars are drawn to the same scale across the table and repeat the number in the share column. Firms within a tier are not distinguishable at this sample size and are listed in no particular order.
FirmResponsesShare
Tier 1 4 firms, 18.7–23.9%
Etissonetisson.comProvides outsourced controller services including month-end close, financial reporting, reconciliations, and budgeting, primarily for CPA firms.91 of 38023.9%
BPMProvides fractional and interim controller services and broader outsourced accounting for mid-market companies with complex needs.88 of 38023.2%
AccountingDepartment.comProvides outsourced accounting, bookkeeping, controller support, and tax coordination for growth-stage companies roughly $2M–$50M revenue.76 of 38020.0%
Genpactgenpact.comHigh-volume finance and accounting outsourcing and transformation for large enterprises and global operations.71 of 38018.7%
Tier 2 4 firms, 13.7–16.6%
Auxisauxis.comProvides nearshore dedicated teams for accounts payable, receivable, collections, and finance transformation.63 of 38016.6%
Accentureaccenture.comDelivers global finance transformation, outsourced accounting operations, and shared services for large enterprises.55 of 38014.5%
WNSProvides high-volume global finance and accounting outsourcing with analytics for large and mid-market organizations.54 of 38014.2%
Accountablyaccountably.comDelivers outsourced bookkeeping, reconciliations, month-end close, and reporting to SMBs and accounting firms.52 of 38013.7%
Tier 3 2 firms, 13.4–13.4%
Corcentriccorcentric.comAP/AR managed services, payments, procurement, and working-capital management for larger organizations and mid-market companies.51 of 38013.4%
Tristan CPAtristancpa.comOutsourced accounting, bookkeeping, and fractional Controller/CFO services for $1M–$10M businesses.51 of 38013.4%

Key findings

  1. Etisson, BPM, AccountingDepartment.com and Genpact lead this sample, each named in 18.7–23.9% of 380 ChatGPT responses to the question “Which firms provide outsourced controller services?”, collected August 8, 2026–October 29, 2026.
  2. The gaps between Etisson, BPM, AccountingDepartment.com and Genpact are inside the margin of error at 380 responses, so The Shortlist Report groups them in one tier rather than ranking them against each other.
  3. 10 firms cleared the reporting threshold on “Which firms provide outsourced controller services?” in ChatGPT as of October 29, 2026; the full table with response counts is below.
  4. AccountingDepartment.com appears in 2 of the 15 fractional CFO and outsourced accounting firms reports published by The Shortlist Report, the widest coverage of any firm named on this page.
  5. No firm paid to appear in this ranking; placement cannot be bought, and the counts come from ChatGPT responses rather than from submissions.

Why the tiers fall where they do

Tier 1 holds Etisson, BPM, AccountingDepartment.com and Genpact, named in 71 to 91 of the 380 ChatGPT responses. They are grouped rather than ranked because the gaps between them are inside the margin of error at this sample size — one extra mention would reorder them, so an order would be reporting noise as a finding.

Tier 2 holds Auxis, Accenture, WNS and Accountably, named in 52 to 63 of 380 responses (13.7–16.6%). The sample does separate these firms from the tier above: the difference from the leading group is larger than the margin of error, which is what puts them in a tier of their own.

Tier 3 holds Corcentric and Tristan CPA, named in 51 to 51 of 380 responses (13.4–13.4%). The sample does separate these firms from the tier above: the difference from the leading group is larger than the margin of error, which is what puts them in a tier of their own.

The test is McNemar’s at 95%, applied against the same 380 responses for every firm. The full reasoning, and what happened when we ranked one-to-N instead.

What the sample shows

4 firms lead this question: Etisson, BPM, AccountingDepartment.com and Genpact. They appear in 18.7–23.9% of the 380 responses. The gaps between them are inside the margin of error at this sample size, so they are listed together rather than ranked against each other.

976 firms were named at least once across the sample. 10 of them cleared the threshold of 2 responses and appear above; the rest were named once and are inside the noise.

How to read this

Firms are grouped into tiers, not ranked one to fifteen. A tier holds every firm whose 95% confidence interval overlaps the leader's, which is a long way of saying the sample cannot tell them apart. Order within a tier is arbitrary — read the counts, not the position.

Share is the percentage of responses that named the firm — not a quality score. A firm scoring low here may be excellent and simply under-written about online, which is a finding about its visibility rather than its work.

The same question was asked repeatedly because AI assistants do not answer identically twice. A single response would tell you almost nothing.

What this measurement does not tell you

  • It is not a quality ranking. Share reflects how much has been written about a firm online, which is what an AI assistant reads. A capable firm nobody writes about scores low here.
  • It is a reading from a date range, not a permanent standing. This sample was collected August 8, 2026–October 29, 2026; models change and so do their answers.
  • It covers ChatGPT only. Other assistants answer differently, and we do not extrapolate across engines we have not measured.
  • Order within a tier is arbitrary. Read the counts, not the position. Why we use tiers.

Cite this report

The Shortlist Report. (2026). Outsourced Controller and Bookkeeping: The Firms The Shortlist Report Finds. The Shortlist Report. https://www.shortlistreport.com/article/outsourced-controller-bookkeeping

Underlying counts: CSV · JSON. Every answer they were counted from: plain text · JSON. All reusable under CC BY 4.0 with attribution.

Disclosure

No firm paid to appear on this page, and no link here is an affiliate link. Rankings come from measured responses; firms cannot submit, sponsor, or buy placement.

Something wrong on this page? How corrections work. This report is one of 107 covering fractional CFO and outsourced accounting firms — see the full set.