The outlay represents a 34 percent rise on the previous highest in all windows of 870 million pounds set 12 months ago and means the overall spend by clubs in 2016-17 already represents a record for a single Premier League season.
"This is the fourth consecutive year the summer transfer spending record ... has been broken," said Business Group partner Dan Jones in a statement.
"At the start of the 2013-14 season the summer transfer spending record stood at 500 million pounds and the fact this record has more than doubled since then is a clear indicator of the financial growth of the league."
Manchester United broke the world record when they re-signed France midfielder Paul Pogba from Juventus for a fee of 89 million pounds, eclipsing the previous highest of 100 million euros (84.20 million pounds) paid by Real Madrid for Gareth Bale in 2013.
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Manchester City were one of 13 Premier League clubs who surpassed their own transfer records when they paid 47.5 million pounds to sign Everton defender John Stones.
"For those clubs traditionally at the upper end of the table who have been investing most significantly, their commercial revenue growth has also been a critical enabler of the increases in spending," Jones said.
Champions Leicester City's 30 million euros swoop for striker Islam Slimani from Sporting Lisbon was one of the biggest moves on a hectic deadline day on Wednesday.
"We also saw a record level of Premier League summer deadline day spending this window," said Jones, "with 155 million pounds spent in the final 24 hours."
Chelsea also splashed out around 34 million pounds to bring Paris St Germain defender David Luiz back for a second spell at Stamford Bridge and Tottenham Hotspur spent 30 million pounds to sign midfielder Moussa Sissoko from Newcastle United.
The combined outlay of the two Manchester clubs made up 42 percent of the league's spending in the window, according to Spreadex.com. (https://www.spreadex.com/sports/news-and-press/press-releases/manchester-teams-into-the-red/)
(Reporting by Ed Dove; Editing by Tony Jimenez)
