Datadog, Inc.
US ˙ NasdaqGS ˙ US23804L1035

SecurityDDOG / Datadog, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership491,716 shares
Latest Disclosed Value $ 66,868,252
Sei Investments Co reports 0.00% increase in ownership of DDOG / Datadog, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 491,716 shares of Datadog, Inc. (US:DDOG) valued at $66,868,459 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 491,711 shares of Datadog, Inc.. This represents a change in shares of 0.00% during the quarter. The current value of the position is $123,091,266 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-02-13 2025-12-31 13F DATADOG CL A COM 23804L103 491,716 5 0.00 66,868 -4.50 0.0660
2025-11-13 2025-09-30 13F DATADOG CL A COM 23804L103 491,711 -35,715 -6.77 70,018 -1.17 0.0753
2025-08-14 2025-06-30 13F DATADOG CL A COM 23804L103 527,426 57,240 12.17 70,849 51.88 0.0821
2025-05-14 2025-03-31 13F/A-1 DATADOG CL A COM 23804L103 470,186 -4,170 -0.88 46,648 -31.18 0.0600
2025-05-13 2025-03-31 13F DATADOG CL A COM 23804L103 460,826 -13,530 62,635 0.0681
2025-02-11 2024-12-31 13F DATADOG CL A COM 23804L103 474,356 88,756 23.02 67,780 52.76 0.0870
2024-11-12 2024-09-30 13F DATADOG CL A COM 23804L103 385,600 46,884 13.84 44,372 1.00 0.0576
2024-08-13 2024-06-30 13F DATADOG CL A COM 23804L103 338,716 40,695 13.66 43,931 19.26 0.0622
2024-05-07 2024-03-31 13F DATADOG CL A COM 23804L103 298,021 -18,001 -5.70 36,836 -3.97 0.0540
2024-02-14 2023-12-31 13F DATADOG CL A COM 23804L103 316,022 -18,328 -5.48 38,359 25.95 0.0616
2023-11-14 2023-09-30 13F DATADOG CL A COM 23804L103 334,350 18,533 5.87 30,456 -1.97 0.0547
2023-08-11 2023-06-30 13F DATADOG CL A COM 23804L103 315,817 44,031 16.20 31,070 57.33 0.0542
2023-05-12 2023-03-31 13F DATADOG CL A COM 23804L103 271,786 -33,080 -10.85 19,748 -11.87 0.0367
2023-02-10 2022-12-31 13F DATADOG CL A COM 23804L103 304,866 31,514 11.53 22,408 -7.67 0.0498
2022-11-14 2022-09-30 13F DATADOG CL A COM 23804L103 273,352 -11,835 -4.15 24,269 -10.79 0.0541
2022-08-15 2022-06-30 13F DATADOG CL A COM 23804L103 285,187 71,540 33.49 27,205 -15.98 0.0587
2022-05-13 2022-03-31 13F DATADOG CL A COM 23804L103 213,647 -11,584 -5.14 32,379 -19.29 0.0651
2022-02-14 2021-12-31 13F DATADOG CL A COM 23804L103 225,231 -18,080 -7.43 40,116 16.64 0.0753
2021-11-12 2021-09-30 13F DATADOG CL A COM 23804L103 243,311 1,169 0.48 34,392 36.47 0.0722
2021-08-06 2021-06-30 13F DATADOG CL A COM 23804L103 242,142 59,509 32.58 25,202 65.57 0.0559
2021-05-12 2021-03-31 13F DATADOG CL A COM 23804L103 182,633 69,131 60.91 15,221 36.23 0.0384
2021-02-08 2020-12-31 13F DATADOG CL A COM 23804L103 113,502 55,615 96.08 11,173 88.92 0.0289
2020-12-04 2020-09-30 13F/A-1 DATADOG CL A COM 23804L103 57,887 -3,669 -5.96 5,914 10.50 0.0171
2020-11-06 2020-09-30 13F DATADOG CL A COM 23804L103 57,887 -3,669 5,914 14,239.5971
2020-08-17 2020-06-30 13F/A-1 DATADOG CL A COM 23804L103 61,556 4,686 8.24 5,352 161.58 0.0166
2020-08-11 2020-06-30 13F DATADOG CL A COM 23804L103 51,046 -5,824 1,929 5,232.5152
2020-05-14 2020-03-31 13F DATADOG CL A COM 23804L103 56,870 5,824 11.41 2,046 6.07 0.0075
2020-02-06 2019-12-31 13F DATADOG CL A COM 23804L103 51,046 28,219 123.62 1,929 149.22 0.0058
2019-11-12 2019-09-30 13F DATADOG CL A COM 23804L103 22,827 22,827 774 0.0020
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.