Chelsea

Drawn as a step, not a curve: Transfermarkt reprices every squad in December and June (marked with a small tick on the axis) and revalues continuously between, so the line only moves when a real valuation changed, never by interpolation.

A month renders no value at all once the priced squad falls below 15 players, so a thin squad is never shown as a cheap one. The series is floored at July 2012 on purpose: earlier Transfermarkt totals reflect which players happened to be priced yet rather than the squad’s real worth, and are excluded rather than shown misleadingly low.

Upstream (dcaribou/transfermarkt-datasets) has been paused since July 2026, so the series ends where the source ends rather than where the season does.

Player valuations from Transfermarkt via github.com/dcaribou/transfermarkt-datasets (CC0).

Exactly one control entity is recorded per franchise, so a portfolio can never count a club twice. Co-controllers and minority holders are shown as published and carry no weight in any total.

The chip names the evidence. Sourced: a primary source is linked (league, club, filing or tier-one outlet). Cross-checked: matched against the ownership-change sweep. Contested: disputed or mid-sale. Rows are reviewed weekly.

Stakes are as published, often only “majority”, and are not pro-rated. A record of control is not a claim about anyone’s intent or conduct.

Spent is the fees paid for players arriving, received the fees for players leaving, both in EUR millions by the July-to-June season of the move. A move with no fee on record (a free, a loan, an undisclosed sum) is counted, never priced: the small figure beside each total is the moves with a fee, plus those without (so 4+3 is four priced arrivals and three unpriced), and a quiet window is not mistaken for a cheap one. Wages are not here: they are estimates nobody licenses, and fees are documented.

Appreciation is the season’s change in squad value with the net spend taken out: buy 100m of players and finish 100m higher is zero; finish 120m higher and the club made 20m of players better, or the market repriced them. It needs a priced squad at both ends of the season (the same 15-player floor as the value chart), so it is blank rather than guessed for a season that lacks one.

The source has been paused since 6 July 2026, so the final row holds only the opening days of its window.

Transfer fees and player valuations from Transfermarkt via github.com/dcaribou/transfermarkt-datasets (CC0).