Ross Kade 4

4 · Bandwidth Inc. · Filed Mar 3, 2026

Form 4

Period: 2026-02-28

Chief Information Officer

Transactions

Exercise/Conversion
Class A Common Stock
2026-02-28+446→ 89,268 total
Exercise/Conversion
Class A Common Stock
2026-02-28+3,392→ 92,660 total
Exercise/Conversion
Class A Common Stock
2026-02-28+1,853→ 94,513 total
Tax Payment
Class A Common Stock
2026-02-28$14.82/sh−1,619$23,994→ 92,894 total
Sale
Class A Common Stock
[F1][F2]
2026-03-02$14.94/sh−19,000$283,938→ 73,894 total
Exercise/Conversion
Restricted Stock Units
[F3][F4]
2026-02-28−446→ 892 total
→ Class A Common Stock (446 underlying)
Exercise/Conversion
Restricted Stock Units
[F3][F5]
2026-02-28−3,392→ 10,174 total
→ Class A Common Stock (3,392 underlying)
Exercise/Conversion
Restricted Stock Units
[F3][F6]
2026-02-28−1,853→ 12,972 total
→ Class A Common Stock (1,853 underlying)

Footnotes (6)

[F1]Reflects shares sold pursuant to a Rule 10b5-1 plan adopted by the Reporting Person on November 24, 2025.
[F2]The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.51 to $15.22. The Reporting Person undertakes to provide Bandwidth Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
[F3]Each Restricted Stock Unit represents a contingent right to receive one share of the Company's Class A Common Stock.
[F4]On August 28, 2023, the Reporting Person was granted 5,353 Restricted Stock Units, one third of which vested on the first anniversary of the date of grant and the remaining shares vest in eight quarterly installments beginning on November 28, 2024.
[F5]On November 28, 2023, the Reporting Person was granted 40,697 Restricted Stock Units, one third of which vested on the first anniversary of the date of grant and the remaining shares vest in eight equal quarterly installments beginning on February 28, 2025.
[F6]On November 28, 2024, the Reporting Person was granted 22,238 Restricted Stock Units, one third of which vested on the first anniversary of the date of grant and the remaining shares vest in eight equal quarterly installments beginning on February 28, 2026.

Signature

/s/ Leah Webb, Attorney-in-Fact for Kade Ross|2026-03-03

Documents

1 file