These are the companies that had the biggest impact on the Dow's historic winning streak

Barring a late-day rally that pushes the average back into the green, the streak will be remembered as the Dow’s longest stretch of daily gains since 1987. What’s more, it will have come within one session of tying the Dow’s record 14-day winning streak from 1897, or more than 125 years ago.

An analysis from Dow Jones Market Data shows UnitedHealth Group Inc. UNH, -0.15%, the most heavily weighted company in the Dow, contributed the most points to the Dow during the streak, adding 281.16 points to the blue-chip average on a net basis through noon Eastern Time on Thursday. A strong earnings report earlier this month helped drive UnitedHealth’s shares higher.

Unlike the S&P 500 and Nasdaq 100, which are weighted by market capitalization, the more old-fashioned Dow is weighted by share price. UnitedHealth’s shares closed at $508 on Wednesday, according to FactSet data.

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