The Lab Notebook: Why Investors Want to See It

The lab notebook — the chronological record of experiments, observations, and results — is a critical due diligence document for deep tech investors. It serves three functions: IP Provenance — the notebook establishes the date of invention, which is critical for patent priority disputes (particularly in first-to-file jurisdictions where the invention date can still matter for certain legal determinations). Reproducibility — a well-maintained notebook demonstrates that the company’s core technology is based on reproducible science, not one-off lucky results. Team Diligence — the quality of the notebook reflects the rigour and discipline of the scientific team, which investors view as a proxy for operational quality. The standard that investors expect: bound notebooks (not loose-leaf), entries in permanent ink, dated and signed by the researcher and witnessed by a colleague, with no gaps or missing pages. Electronic lab notebooks (ELNs) are increasingly accepted but must have audit trails that are as robust as physical notebook protocols.