 Keybank National Association OH lowered its holdings in ADTRAN, Inc. NASDAQ:ADTN by 2.7 during the second quarter, HoldingsChannel reports. The fund owned 44,000 shares of the communications equipment providers stock after selling 1,234 shares during the period. Keybank National Association OHs holdings in ADTRAN were worth 481,000 as of its most recent SEC filing. Several ... 