"Shareholders contemplating a transaction in the Trust's shares between the record date and payment date should consult a broker regarding their entitlement to the split shares."
Here is how MasterCard answered the question for its split in 2014:
Q7. What happens if I bought shares of MasterCard stock after the January 9, 2014 record date but before the January 21, 2014 distribution date? If you bought shares of MasterCard stock at the pre-split price between the January 9, 2014 record date and the January 21, 2014 distribution date, you were entitled to receive the split shares. The shares you purchased had a “due bill” attached, entitling you to the split shares. Due bills settle on or about January 27, 2014.
Buying today does not make it to late for the split.If you buy someone sold and they sold shares with a "due bill" attached,that"due bill" gives the buyer the rights to the split.You can buy up until the day before the dod or date of distribution and get the split shares.