Notice of Proposed Sale · 144
Datadog, Inc.
DDOGNASDAQEQUITYCurrent
Notice of Proposed Sale
Structured filing — 144
primary_doc.xml
Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.
Proposed-sale notice
- Issuer
- Datadog, Inc.
- Issuer CIK
- 0001561550
- SEC file number
- 001-39051
- Phone
- 8663294466
- Person for whose account securities are to be sold
- Callahan-Thernstrom Family Trust
- Relationships to issuer
- Director
- Street
- 620 8th Avenue, 45th Floor
- City
- New York
- State / country code
- NY
- Postal code
- 10018
Securities proposed for sale
| Security | Proposed units | Aggregate market value | Units outstanding | Approximate sale date | Exchange | Broker / market maker |
|---|---|---|---|---|---|---|
| Class A Common | 12,500 | 3,420,000.00 | 330,825,798 | 08/04/2026 | NASDAQ | Morgan Stanley Smith Barney LLC Executive Financial Services |
Broker / market maker — proposed row 1, entry 1
- Name
- Morgan Stanley Smith Barney LLC Executive Financial Services
- Street
- 1 New York Plaza
- Street (continued)
- 8th Floor
- City
- New York
- State / country code
- NY
- Postal code
- 10004
Acquisition of securities to be sold
| Security | Acquired | Nature of acquisition | Acquired from | Amount acquired | Gift transaction | Payment date | Nature of payment |
|---|---|---|---|---|---|---|---|
| Class A Common | 04/29/2011 | Private Acquisition from Issuer or an Affiliate | Issuer | 12,500 | N | 04/29/2011 | N/A |
Sales reported in the preceding three months
| Seller | Security | Sale date | Amount sold | Gross proceeds |
|---|---|---|---|---|
| 10b5-1 Sales for Callahan-Thernstrom Family Trust | Class A Common | 07/01/2026 | 12,500 | 3,343,375.00 |
| 10b5-1 Sales for Callahan-Thernstrom Family Trust | Class A Common | 06/29/2026 | 12,500 | 3,093,375.00 |
| 10b5-1 Sales for Callahan-Thernstrom Family Trust | Class A Common | 06/12/2026 | 75,000 | 17,348,985.00 |
| 10b5-1 Sales for Callahan-Thernstrom Family Trust | Class A Common | 06/12/2026 | 37,500 | 8,706,172.50 |
| Michael Callahan | Class A Common | 05/15/2026 | 2,500 | 527,387.50 |
Seller — prior-sale row 1, entry 1
- Name
- 10b5-1 Sales for Callahan-Thernstrom Family Trust
- Street
- 620 8th Avenue, 45th Floor
- City
- New York
- State / country code
- NY
- Postal code
- 10018
Seller — prior-sale row 2, entry 1
- Name
- 10b5-1 Sales for Callahan-Thernstrom Family Trust
- Street
- 620 8th Avenue, 45th Floor
- City
- New York
- State / country code
- NY
- Postal code
- 10018
Seller — prior-sale row 3, entry 1
- Name
- 10b5-1 Sales for Callahan-Thernstrom Family Trust
- Street
- 620 8th Avenue, 45th Floor
- City
- New York
- State / country code
- NY
- Postal code
- 10018
Seller — prior-sale row 4, entry 1
- Name
- 10b5-1 Sales for Callahan-Thernstrom Family Trust
- Street
- 620 8th Avenue, 45th Floor
- City
- New York
- State / country code
- NY
- Postal code
- 10018
Seller — prior-sale row 5, entry 1
- Name
- Michael Callahan
- Street
- 620 8th Avenue, 45th Floor
- City
- New York
- State / country code
- NY
- Postal code
- 10018
Prior-sale reporting
- Nothing to report for the preceding three months
- N
Notice signature
- Notice date
- 08/04/2026
- Signed
- /s/ Michael Callahan
- Plan adoption dates
- 03/13/2026