The Phoenix Holdings exploited the drop in Isracard's share price after the Competition Authority announced opposition to Harel acquiring the credit card company.
The purchase by the couple, their first investment in Israel, was part of a NIS 350 million secondary offering by the Tel Aviv Stock Exchange and Israeli financial institutions.
Strong rises on Wall Street, the weakness of the dollar worldwide and optimism on a Gaza ceasefire are among reasons for the Israeli currency's appreciation.
Harel is considering an appeal against the Competition Authority's nixing of the merger with the credit card company, while two other suitors await developments.
The mega deal has been approved by the Bank of Israel and the Capital Markets, Insurance and Savings Authority, but, as feared, has fallen at the third regulatory hurdle.