M&A due diligence is the buyer's structured investigation of a target company between signing a letter of intent and closing the deal. Its purpose is to validate the investment thesis and surface the risks that affect pricing and deal structure — to independently and objectively spot red flags and address legal risks before the contract is finalized. The work runs across four major workstreams, and all of them are fundamentally exercises in reading documents.
The Four Workstreams
Due diligence runs across financial, legal, operational, and tax workstreams, typically all simultaneously after the LOI is signed. The legal workstream is led by the buyer's M&A attorney, the financial workstream by a transaction CPA, and operational diligence by the buyer or operational consultants. Each workstream produces findings that feed into the purchase price, the working capital peg, earnout structures, and indemnification provisions.
Why Document Review Dominates
Every workstream depends on reading the data room — the secure repository where the seller organizes corporate records, financials, contracts, IP assignments, employment agreements, and litigation files. A typical data room holds hundreds of documents, and someone has to read every one to find the change-of-control clause, the customer concentration, the unassigned patent, or the undisclosed litigation. This reading is the labor-intensive core of diligence, and it's exactly what consumes the cost and the timeline.
The Scale of the Reading
This is a complex, time-consuming, labor-intensive part of the workflow — which is why legal and advisory fees for due diligence can reach up to 10% of total deal value. The AI agent that reads every data room document and surfaces the material risks is demonstrated at omnionlinestrategies.com/ai-agent-ma-due-diligence.