**Every column has some missing values, except that none are true NULLs.** Missing data in this dataset is stored as empty strings. A NULL-based check found zero NULLs in every column of every table (step-2 and step-11), while the empty-string check found gaps (step-9). Across all 446 rows in the five monthly tables, the share missing per column is: | Column | Missing rows | % missing | |---|---|---| | Stage | 127 | 28.5% | | Investor | 45 | 10.1% | | Founders | 38 | 8.5% | | Amount | 25 | 5.6% | | Location | 20 | 4.5% | | Company Name | 19 | 4.3% | | Sector | 19 | 4.3% | | Founded | 18 | 4.0% | | What it does | 18 | 4.0% | I worked out the percentages by dividing each missing count from the all-months row of step-9 by 446. **Where the gaps sit, by month:** - **Stage:** This is the largest gap, and it comes mostly from January (43 of 115 rows, 37%), March (31 of 98, 32%) and February (29 of 96, 30%). It is filled in almost every April row (3 of 95 missing, 3%). May has 21 of 42 missing (50%). - **May:** This month drives most of the gaps in the core fields. - About 43–45% of its rows are blank in Company Name (19), Founded (18), Location (19), Sector (19) and What it does (18). - Founders is missing in 27 of 42 rows (64%). - Investor, Amount and Stage are each missing in about half (21 of 42). - These blank rows match the card's note that some May rows are misaligned or blank. They are likely junk or empty rows rather than genuinely unknown values. - **January to April:** The core fields (company, founded, location, sector, description) are essentially complete, apart from 1 missing Location in April. - **Investor:** It is missing in 5 January rows, 6 February, 3 March and 10 April, on top of May. - **Founders:** It is missing in 10 April rows and 1 February row, on top of May. - **Amount:** It is missing in only 2 rows each in February and April, on top of May. If you exclude the blank May rows, the only substantial gap is Stage, at about 30% missing in January to March. Investor and Founders each have a few percent missing, and the rest are nearly complete.