SCHEDULE 13G/A

Amplitude Inc

Class A Common Stock, $0.00001 par value per share · CUSIP: 03213A104

Event date: 2025-03-31

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Battery Ventures XI-A, L.P.

  Shares: 1,587,632.00 · Class: 1.6%

• Battery Ventures XI-B, L.P.

  Shares: 419,490.00 · Class: 0.4%

• Battery Ventures XI-A Side Fund, L.P.

  Shares: 1,649,453.00 · Class: 1.7%

• Battery Ventures XI-B Side Fund, L.P.

  Shares: 357,671.00 · Class: 0.4%

• Battery Investment Partners XI, LLC

  Shares: 73,579.00 · Class: 0.1%

• Battery Partners XI, LLC

  Shares: 2,080,701.00 · Class: 2.1%

• Battery Partners XI Side Fund, LLC

  Shares: 2,007,124.00 · Class: 2.0%

• Battery Ventures Select Fund I, L.P.

  Shares: 327,766.00 · Class: 0.3%

• Battery Partners Select Fund I, L.P.

  Shares: 327,766.00 · Class: 0.3%

• Battery Investment Partners Select Fund I, L.P.

  Shares: 35,713.00 · Class: 0.0%

• Battery Partners Select Fund I GP, LLC

  Shares: 363,479.00 · Class: 0.4%

• Neeraj Agrawal

  Shares: 4,665,785.00 · Class: 4.7%

• Michael M. Brown

  Shares: 4,631,498.00 · Class: 4.7%

• Morad Elhafed

  Shares: 372,948.00 · Class: 0.4%

• Jesse Feldman

  Shares: 4,520,506.00 · Class: 4.6%

• Russell L. Fleischer

  Shares: 4,534,531.00 · Class: 4.6%

• Roger H. Lee

  Shares: 4,522,831.00 · Class: 4.6%

• Chelsea R. Stoner

  Shares: 4,608,506.00 · Class: 4.7%

• Dharmesh Thakker

  Shares: 4,451,304.00 · Class: 4.5%

• Scott R. Tobin

  Shares: 4,522,830.00 · Class: 4.6%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.