Additive
Founded 2023 · 22 employees on LinkedIn · 6 known investors
Additive provides a GenAI tool that extracts tax data from K-1, K-3, and related forms (including state forms, 199A, 926, and others), converting PDF tax packages into Excel workpapers or JSON via a web app, Excel add-in, or API. It serves accountants, accounting firms, family offices, and private wealth management groups preparing tax returns in the asset and wealth management space.
Also known as Additive AI
Founders & leadership
Additive was founded in 2023 by Venky Iyer.
Investors · 6
Also in the syndicate · 5
Company profile
researched Aug 2026Additive builds generative-AI software that converts partnership and trust tax packages into structured data for tax professionals. The product ingests PDF tax documents and extracts data from K-1 forms (1065, 8865, 1041 and 1120-S), K-3 forms, 65 state forms including California, New York and Illinois, as well as 199A, 926, 8621 and UBTI forms and related footnotes and statements. Output is delivered as Excel workpapers, JSON or PDF for review and for loading into tax software.
The company describes its system as purpose-built for tax data extraction, claiming over 99% accuracy on characters of income and over 95% on footnotes, and the ability to process tax packages running to tens of thousands of pages. Users can start extraction from the Additive web application or directly from Excel via an add-in, and review results in Excel; an API is offered for integration into customers' own systems. The company states it is SOC 2 Type 2 compliant.
Additive frames its market as accounting services, which it describes as a $600 billion market characterized by a talent shortage and largely manual workflows. Its founding team includes Dwight Crow, a repeat founder who previously built and sold an AI-based medical device company, Whisper, and an earlier AI company sold to Facebook; Aaron Taylor, previously Senior Director of Generative AI at Salesforce and head of engineering at two acquired AI startups; Venky Iyer, an early Facebook engineer who led the entities team and was an engineering leader at Fin Exploration Company; and Pete Toporzycki, a former PwC tax senior manager.
Founding story
The founding team combines large-technology-company AI and engineering leadership with tax practice experience: early Facebook engineering and machine learning leadership, generative AI leadership at Salesforce, prior AI startup exits, and a PwC tax senior manager background covering the PwC Products & Technology Group and M&A diligence and structuring work.
Business model
Additive sells software to tax preparers, delivered as a web application, an Excel add-in and an API that can be embedded in customers' existing tools. Extraction output is exported as PDF, JSON or Excel workpapers for downstream tax software, positioning the product as a data-extraction layer within existing tax preparation workflows rather than a replacement tax engine.
Traction
The company states its software is used by Big 4, Top 5 and Top 20 accounting firms, family offices and private wealth management groups, and publishes testimonials attributed to a Big 4 senior, a national go-to-market leader at a Top 5 firm, a head of financial services at a Top 20 firm and the head of a large family office.
Latest developments
Additive has been hiring a founding full-stack software engineer in San Francisco following its reported financing of more than $6 million.
▸Full profile — market position, technology, go-to-market, geography, history
Market position
Additive targets tax data extraction within the asset and wealth management space and reports usage by Big 4, Top 5 and Top 20 accounting firms as well as family offices and private wealth management groups. It describes accounting services as a $600 billion market with a talent shortage and heavily manual workflows.
Additive positions itself on breadth of supported forms, processing speed on very large tax packages, extraction accuracy including complex footnotes and tables, and delivery inside the tools accountants already use, particularly Excel. Customer testimonials cited on its site compare it favorably with legacy platforms and newer entrants on speed, accuracy and usability, and the company points to SOC 2 Type 2 compliance and use by Big 4 firms as security credentials.
Technology
The product applies purpose-built generative AI to extract tax data, footnotes, statements and complex tables from PDF tax packages, supporting K-1 (1065, 8865, 1041, 1120-S), K-3, 65 state forms, 199A, 926, 8621 and UBTI. It is delivered through a web application, an Excel add-in and an API, exporting PDF, JSON or Excel workpapers, and the company states SOC 2 Type 2 compliance.
Go-to-market
The company markets directly to accounting firms and wealth managers through a demo request on its website and cites adoption by Big 4, Top 5 and Top 20 accounting firms, large family offices and private wealth management groups. Product entry points inside Excel and via API are presented as requiring no training for reviewers.
Accounting firms, including Big 4 and other large national firms, family offices and private wealth management groups that prepare tax returns.
Geography
The company is based in San Francisco, where it requires in-office work five days a week and offers relocation to the Bay Area; its product focus is on US federal and state tax forms.
History
The company assembled a founding team drawn from Facebook, Salesforce, Fin Exploration Company and PwC, and stated it had raised more than $6 million from Elad Gil, Blake Byers and a group of angel investors in an oversubscribed round. It has recruited founding engineers in San Francisco and reports use of its product by Big 4 and other large accounting firms, family offices and private wealth management groups.
Compiled by commissioned research from 8 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
Timeline · 1
launches, deals, and filingsAdditive stated it had raised more than $6 million in an oversubscribed round backed by Elad Gil, Blake Byers, Naval Ravikant, Lukas Biewald, Robert Nishihara, Fred Ehrsam, Immad Akhund and Henry Kravis.
$6M source ↗
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
▸Research sources · 8
primary sources listed
- Additiveadditive.ai · web
8 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Additive do?
- Additive builds generative-AI software that converts K-1 and related tax PDFs into Excel workpapers, JSON or API-delivered data.
- Who founded Additive?
- Additive was founded by Venky Iyer in 2023.
- Who are Additive's investors?
- Additive's investors include Mantis Capital.