X0306 4/A 2021-03-01 2021-03-02 0 0000913142 BELDEN INC. BDC 0001632666 Anderson Brian Edward C/O BELDEN INC. 1 N. BRENTWOOD BLVD., 15TH FLOOR SAINT LOUIS MO 63105 0 1 0 0 SVP, Legal, GC and Corp. Sec. Common Stock 2021-03-01 4 M 0 1590 35.83 A 28195 D Common Stock 2021-03-01 4 D 0 1349 45.695 D 26846 D Common Stock 294.3812 I By 401(k) Plan Stock Appreciation Rights 35.83 2021-03-01 4 M 0 1590 0.00 D 2021-03-01 Common Stock 1590 0 D This represents the difference between the number of SARs exercised (1,590) and the number of shares issued as a result of the exercise (241). The number of shares to be issued under a SAR exercise is determined by multiplying the number of SARs being exercised by the difference between the FMV on the date of exercise ($45.695) and the exercise price ($35.83). Additional shares are then withheld to satisfy the Company's tax withholding obligations. Following the filing of the original Form 4, a payroll adjustment resulted in the number of shares being withheld for taxes to be decreased by 19, leading to this amendment. Represents the balance of shares of Belden Inc. common stock held in the Belden Retirement Savings Plan as of the date of this filing. 530 SARs became exercisable on March 1, 2012, 530 SARs became exercisable on March 1, 2013 and 530 SARs became exercisable on March 1, 2014. /s/ Brian E. Anderson 2021-03-03