Big European banks have been experiencing robust growth due to a resurgence in deal-making and high investment banking revenue. The Euro Stoxx banking index (SX7E) is up 19%, while the Euro Stoxx 600 Index (SXXP) rose nearly 9% this year. The index has also beaten its US peer, the SPDR Select Sector Fund (XLF), which climbed 9% year-to-date. The primary reason that led the sector to outperform was major big banks’ first-quarter earnings topped a low bar of market expectations, which may also provide opportunities for further valuation upgrades. However, the imminent EU Parliamentary Elections …