Automatic Data Processing, Inc.
US ˙ NasdaqGS ˙ US0530151036

SecurityADP / Automatic Data Processing, Inc.
InstitutionElefante Mark B
Latest Disclosed Ownership23,424 shares
Latest Disclosed Value $ 4,759,288
Elefante Mark B reports 17.66% increase in ownership of ADP / Automatic Data Processing, Inc.

On May 14, 2026 - Elefante Mark B filed a 13F-HR form disclosing ownership of 23,424 shares of Automatic Data Processing, Inc. (US:ADP) valued at $4,759,288 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 14, 2026 disclosing 19,908 shares of Automatic Data Processing, Inc.. This represents a change in shares of 17.66% during the quarter. The current value of the position is $5,418,205 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)
2026-05-14 2026-03-31 13F AUTOMATIC DATA PROCESSING COM 053015103 23,424 3,516 17.66 4,759 -7.05 0.7763
2026-02-14 2025-12-31 13F AUTOMATIC DATA PROCESSING COM 053015103 19,908 906 4.77 5,121 -8.19 3.1378
2025-11-10 2025-09-30 13F AUTOMATIC DATA PROCESSING COM 053015103 19,002 1,767 10.25 5,577 4.93 3.5681
2025-07-28 2025-06-30 13F AUTOMATIC DATA PROCESSING COM 053015103 17,235 -478 -2.70 5,315 -1.77 3.9925
2025-05-06 2025-03-31 13F AUTOMATIC DATA PROCESSING COM 053015103 17,713 2,563 16.92 5,412 22.03 4.2881
2025-02-14 2024-12-31 13F AUTOMATIC DATA PROCESSING COM 053015103 15,150 9,679 176.91 4,435 444.05 4.0499
2020-07-28 2020-06-30 13F AUTOMATIC DATA PROCESSING COM 053015103 5,471 633 13.08 815 23.30 2.7538
2020-05-07 2020-03-31 13F AUTOMATIC DATA PROCESSING COM 053015103 4,838 0 0.00 661 -19.78 2.8852
2020-01-15 2019-12-31 13F AUTOMATIC DATA PROCESSING COM 053015103 4,838 0 0.00 824 5.51 2.9916
2019-11-06 2019-09-30 13F AUTOMATIC DATA PROCESSING COM 053015103 4,838 -528 -9.84 781 -11.85 3.0683
2019-07-24 2019-06-30 13F AUTOMATIC DATA PROCESSING COM 053015103 5,366 95 1.80 886 5.10 3.4345
2019-05-02 2019-03-31 13F AUTOMATIC DATA PROCESSING COM 053015103 5,271 -930 -15.00 843 3.69 3.6762
2019-01-24 2018-12-31 13F AUTOMATIC DATA PROCESSING COM 053015103 6,201 10 0.16 813 -12.86 3.8905
2018-10-15 2018-09-30 13F AUTOMATIC DATA PROCESSING COM 053015103 6,191 15 0.24 933 12.55 3.7369
2018-07-30 2018-06-30 13F AUTOMATIC DATA PROCESSING COM 053015103 6,176 -85 -1.36 829 16.60 3.9576
2018-04-24 2018-03-31 13F AUTOMATIC DATA PROCESSING COM 053015103 6,261 -100 -1.57 711 -4.56 3.5689
2018-02-02 2017-12-31 13F AUTOMATIC DATA PROCESSING COM 053015103 6,361 1,400 28.22 745 37.45 3.5488
2017-10-26 2017-09-30 13F AUTOMATIC DATA PROCESSING COM 053015103 4,961 200 4.20 542 11.07 3.9548
2017-07-26 2017-06-30 13F AUTOMATIC DATA PROCESSING COM 053015103 4,761 85 1.82 488 1.88 3.9508
2017-05-15 2017-03-31 13F AUTOMATIC DATA PROCESSING COM 053015103 4,676 625 15.43 479 15.14 4.3451
2017-02-14 2016-12-31 13F AUTOMATIC DATA PROCESSING Common Stock 053015103 4,051 596 17.25 416 36.84 5.0248
2016-11-16 2016-09-30 13F AUTOMATIC DATA PROCESSING Common Stock 053015103 3,455 -325 -8.60 304 -12.39 4.9080
2016-08-08 2016-06-30 13F AUTOMATIC DATA PROCESSING Common Stock 053015103 3,780 0 0.00 347 2.36 5.2235
2016-05-27 2016-03-31 13F AUTOMATIC DATA PROCESSING Common Stock 053015103 3,780 900 31.25 339 39.51 5.4119
2016-02-12 2015-12-31 13F AUTOMATIC DATA PROCESSING Common Stock 053015103 2,880 2,880 243 6.5305
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.