SHAREHOLDER INVESTIGATION: Halper Sadeh LLP Investigates ADTN, TSC, FIBK, CBTX; Shareholders are Encouraged to Contact the Firm

NEW YORK, Nov. 29, 2021 /PRNewswire/ -- Halper Sadeh LLP, a global investor rights law firm, announces it is investigating the following companies:

ADTRAN, Inc. (NASDAQ: ADTN) concerning potential violations of the federal securities laws and/or breaches of fiduciary duties relating to its merger with ADVA. Following completion of the transaction, ADTRAN shareholders are expected to own approximately 54% of the combined company. If you are an ADTRAN shareholder, click here to learn more about your rights and options.