The current institutional shareholding score of ADTRAN Holdings Inc is 10.00, ranking 1 out of 54 in the Communications & Networking industry. The latest institutional shareholding proportion is 91.90%, representing a quarter-over-quarter increase of 1.20%. The largest institutional shareholder is Chuck Royce, holding a total of 2.03M shares, representing 3.88% of shares outstanding, with 0.49% increase in holdings.