Definition

OHLC

The four prices that summarize an interval of trading: Open, High, Low, Close. Every bar and candlestick chart is an OHLC series rendered visually; the close is the value most downstream calculations (returns, moving statistics) are built on.

Formula

OHLC = Open · High · Low · Close, per interval

Drivers — what actually moves it

Interval choice: OHLC is only meaningful relative to its interval — a weekly high is not a daily high.
Session boundaries: the open and close depend on which session counts (regular hours vs extended) — conventions differ by venue and vendor.
Adjustment basis: adjusted series restate past OHLC for splits/dividends; unadjusted series show as-traded prices.

Where it comes from

Market data construct (not a filing concept). Aggregated from trade prints per interval by the data source. Echelon stamps source, as-of time, and adjustment basis next to every chart.

Sector caveats — where this breaks

Extended-hours prints can sit outside the regular-session OHLC — a "gap" at the open is often just trading you didn't see.

Candlestick Adjusted close Volume

Educational use only — not investment advice. Figures come from public SEC filings; Echelon teaches you to analyze data, it never recommends buying or selling any security.