Shares of Space Exploration Technologies Corp. continued to trade higher Monday morning as investors positioned ahead of the company's addition to the Nasdaq-100 index, a milestone scheduled to take effect before markets open Tuesday and one that will mark the fastest index inclusion in the benchmark's history.

SPCX shares stood at $163.79, up $1.79, or 1.10 percent, as of 10:19 a.m. Eastern time, according to Google Finance data. The move comes just 15 trading days after SpaceX's initial public offering, which priced shares at $135 on June 12 and raised between roughly $75 billion and $85.7 billion, depending on the reporting source, making it the largest IPO in market history and valuing the company at approximately $1.77 trillion at the time of its debut.

SpaceX's rapid path to inclusion in the Nasdaq-100 was made possible by a relatively new exchange rule that fast-tracks large initial public offerings into the index after just 15 trading days, a significant reduction from the longer waiting period previously required of newly listed companies. Nasdaq confirmed the inclusion on June 27, setting the stage for the company's shares to become part of a benchmark that underpins more than $800 billion in tracked assets, including the widely held Invesco QQQ Trust and numerous retirement and 401(k) funds.

The stock's performance since its debut has been volatile. Shares initially surged to an intraday high of $225.64 in the days following the IPO before retreating sharply, falling as much as 28 percent from that peak. Last week alone, SPCX shares dropped 16.4 percent after analysts at KeyBanc adopted a more cautious stance, arguing that the stock's........

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