Datadog, Inc. 4

Reporting person Michael James Callahan converted 12,500 Class B shares into Class A and sold 12,500 Datadog Class A shares for about $3.3 million under a 10b5-1 plan.

On July 1, 2026, Datadog, Inc. insider Michael James Callahan, acting as trustee of The Callahan-Thernstrom Family Trust, converted 12,500 shares of Class B Common Stock into 12,500 shares of Class A Common Stock and immediately sold 12,500 Class A shares at an average price of $267.47 per share under a pre-established Rule 10b5-1 trading plan dated March 13, 2026. The transaction generated proceeds of approximately $3.34 million and reduced the trust’s Class A direct holdings to 14,996 shares while it continued to hold 98,042 Class A shares indirectly by trust, alongside a remaining 20,684 shares of Class A Common Stock held directly outside the trust. The Class B to Class A conversion was non-cash and simply changed the share class, while the subsequent open-market sale represented a sizable liquidity event but appears to be structured as part of a planned diversification program.

Filing Facts

CIK

1561550

Ticker

DDOG

Form

4

Source Type

fda

Accession

0001561550-26-000236

Alert Tier

9