After Amazon these 20 companies could follow a stock split wave
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Stocks splits are historically bullish for companies, the Research Investment Committee at BofA Securities says.
"Average returns one year later are 25% (vs. 9% for the market)," strategist Jared Woodard and team wrote in a note Thursday. "Recently, splits have become scarce with returns more subdued, but still well above benchmarks."
"Again, we pose some questions for CFOs of companies with high-priced stocks: if share splits can attract inflows and support prices, do those benefits outweigh the benefits of doing a costly share repurchase? Would a share split and its effects enable management teams to allocate more funds to R&D, raise productivity, or strengthen balance sheets for a rainy day?"
"If more corporate managers adopt shareholder-friendly postures, it could spark a wave of splits and bring more investors flows into the market, proving support for embattled growth companies," Woodard added.
Which stocks could be caught in that wave?
BofA highlighted S&P 500 (SP500)
(NYSEARCA:SPY) stocks trading above $500, which have $5.7T in market cap and make up about 15.5% of the index. 
In the list, Amazon (NASDAQ:AMZN) and Alphabet (NASDAQ:GOOG) (GOOG) have announced splits.
The remaining 20 and their last closing prices are:

NVR (NYSE:NVR), $4,814.16
Booking Holdings (NASDAQ:BKNG), $2,035.47
AutoZone (NASDAQ:AZN), $1,884.56
Chipotle (NYSE:CMG), $1,420.63
Mettler-Toledo (NYSE:MTD), $1,388.29
Tesla (NASDAQ:TSLA), $858.97
Equinix (NASDAQ:EQIX), $704.20
BlackRock (NYSE:BLK), $693.25
O'Reilly Automotive (NASDAQ:ORLY), $674.70
TransDigm (NYSE:TDG), $633.93
Regeneron Pharma (NASDAQ:REGN), $623.43
Broadcom (NASDAQ:AVGO), $597.02
ServiceNow (NYSE:NOW), $559.58
Charter Communications (NASDAQ:CHTR), $557.75
Bio-Rad Laboratories (NYSE:BIO), $554.27
Thermo Fisher Scientific (NYSE:TMO), $541.70
SVB Financial (NASDAQ:SIVB), $538.94
IDEXX Labs (NASDAQ:IDXX), $529.92
Costco (NASDAQ:COST), $527.65
Lam Research (NASDAQ:LRCX), $517.31

BofA also showed notable post-split outperformers by decade, including AMD (NASDAQ:AMD), Moster Beverage (NASDAQ:MNST) and Nike (NYSE:NKE)(see table at bottom).
See what Wall Street thinks of Amazon's stock split and buyback.