Netflix (NFLX) had the highest return between October 1, 2012 and June 30, 2015 by a US stock in the S&P 500 (GSPC), returning 1,103.2%.

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Sorry, I don't have the answer to that one.

Teck Resources Ltd Class B (TECK) had the highest return between December 20, 2015 and January 2, 2017 by a large-cap US stock, returning 493.9%.

Argenx NV ADR (ARGX) had the highest return between December 20, 2016 and January 2, 2018 by a large-cap US stock, returning 256.1%.

The lowest intraday price for Citigroup (C) in a day since 2008 was $7.35, on March 5, 2009. It was down 7.3% for the day. The latest price is $63.26.

Twilio (TWLO) had the highest return between December 20, 2017 and January 2, 2019 by a large-cap US stock, returning 248.4%.

Sea (SE) had the highest return between December 20, 2018 and January 2, 2020 by a large-cap US stock, returning 253.7%.

The lowest intraday price for Citigroup (C) in a day all-time was $5.48, on October 20, 1987. The latest price is $63.26.

Tesla (TSLA) had the highest return between December 20, 2019 and January 2, 2021 by a large-cap US stock, returning 760%.

The closing price for Citigroup (C) in 2008 was $50.70, on December 31, 2008. It was down 76.2% for the year. The latest price is $62.42.

GameStop (GME) had the highest return between December 20, 2020 and January 2, 2022 by a large-cap US stock, returning 838.6%.

YPF Sociedad Anonima (YPF) had the highest return between December 20, 2021 and January 2, 2023 by a large-cap US stock, returning 147.7%.

The closing price for Citigroup (C) since 2008 is $63.58, on Friday. It is down 70.9% in that time. The latest price is $63.58.

Carvana (CVNA) had the highest return between December 20, 2022 and January 2, 2024 by a large-cap US stock, returning 1,036.5%.