SpaceX Index Inclusion Dates Matter More Than IPO, TD Says

SpaceX closed its first trading day above $160, up 19%, with a market cap north of $2 trillion. The IPO was the headline. The dates that matter for how the stock trades are still ahead, according to TD Securities.

Peter Haynes, the firm's head of index and market structure, told CNBC's "ETF Edge" this week that the real action starts when indexes adjust. "Day 15 [after SpaceX goes public], which should be July 6… will be the day that Nasdaq rebalances the 100 Index to reflect SpaceX's IPO shares," he said. After that, the focus shifts to when indexes adjust for additional shares that become freely tradable down the road.

The S&P 500 Index Committee made what Haynes called a "controversial decision" earlier this month. SpaceX will not be fast-tracked into the S&P 500. The stock must trade for at least one year before it becomes eligible. That leaves the other benchmarks – the S&P Total Market Index, MCI Global Index, Russell Indexes and Nasdaq 100 – as the near-term catalysts.

SpaceX opened at the Nasdaq at 11:46 a.m. ET on Friday. The stock closed at $160.95, up more than 19%, with a market cap above $2 trillion.

In a note to CNBC after Friday's close, Haynes wrote: "We take for granted that the infrastructure that supports the equity trading business always works. Today was a test of that infrastructure and in my opinion the industry passed the test."

The read-through for the broader market is about index mechanics. When a stock the size of SpaceX enters major benchmarks, passive funds and ETFs must rebalance. That creates forced buying and selling that can ripple through related sectors – aerospace, defense, space technology and launch services. The July 6 Nasdaq 100 rebalance is the first concrete date. The Russell and MCI rebalances follow later in the summer. Each one forces a new wave of index-driven flows.

Haynes' point is that the IPO was the headline. The real trading event is the index inclusion calendar.