Pediatrix Medical Group, Inc.
US ˙ NYSE ˙ US58502B1061

SecurityMD / Pediatrix Medical Group, Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership192,293 shares
Latest Disclosed Value $ 4,113,128
Rhumbline Advisers reports 3.35% increase in ownership of MD / Pediatrix Medical Group, Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 192,293 shares of Pediatrix Medical Group, Inc. (US:MD) valued at $4,113,147 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 186,052 shares of Pediatrix Medical Group, Inc.. This represents a change in shares of 3.35% during the quarter. The current value of the position is $4,347,745 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)
2026-05-12 2026-03-31 13F PEDIATRIX MEDICAL GROUP COM 58502B106 192,293 6,241 3.35 4,113 3.37 0.0035
2026-02-13 2025-12-31 13F PEDIATRIX MEDICAL GROUP COM 58502B106 186,052 -30,264 -13.99 3,980 9.83 0.0032
2025-11-06 2025-09-30 13F PEDIATRIX MEDICAL GROUP COM 58502B106 216,316 -3,517 -1.60 3,623 14.87 0.0029
2025-08-12 2025-06-30 13F PEDIATRIX MEDICAL GROUP COM 58502B106 219,833 2,887 1.33 3,155 0.35 0.0027
2025-05-29 2025-03-31 13F/A-1 PEDIATRIX MEDICAL GROUP COM 58502B106 216,946 -7,755 -3.45 3,144 6.61 0.0029
2025-04-08 2025-03-31 13F PEDIATRIX MEDICAL GROUP COM 58502B106 216,946 -7,755 3,144 0.0029
2025-05-29 2024-12-31 13F/A-1 PEDIATRIX MEDICAL GROUP COM 58502B106 224,701 3,822 1.73 2,948 15.20 0.0026
2025-01-30 2024-12-31 13F PEDIATRIX MEDICAL GROUP COM 58502B106 224,701 3,822 2,948 0.0026
2024-11-12 2024-09-30 13F PEDIATRIX MEDICAL GROUP COM 58502B106 220,879 -5,064 -2.24 2,560 50.09 0.0023
2024-08-01 2024-06-30 13F PEDIATRIX MEDICAL GROUP COM 58502B106 225,943 42 0.02 1,706 -24.72 0.0016
2024-05-09 2024-03-31 13F PEDIATRIX MEDICAL GROUP COM 58502B106 225,901 569 0.25 2,266 8.11 0.0022
2024-02-08 2023-12-31 13F PEDIATRIX MEDICAL GROUP COM 58502B106 225,332 -2,549 -1.12 2,096 -27.66 0.0022
2023-11-09 2023-09-30 13F PEDIATRIX MEDICAL GROUP COM 58502B106 227,881 -43,524 -16.04 2,896 -24.90 0.0034
2023-08-08 2023-06-30 13F PEDIATRIX MEDICAL GROUP COM 58502B106 271,405 -12,617 -4.44 3,857 96,300.00 0.0043
2023-05-11 2023-03-31 13F PEDIATRIX MEDICAL GROUP COM 58502B106 284,022 10,854 3.97 4 -99.90 0.0052
2023-02-14 2022-12-31 13F PEDIATRIX MEDICAL GROUP COM 58502B106 273,168 -2,479 -0.90 4,059 -10.81 0.0055
2022-11-10 2022-09-30 13F PEDIATRIX MEDICAL GROUP COM 58502B106 275,647 53,810 24.26 4,551 -2.36 0.0068
2022-08-11 2022-06-30 13F MEDNAX COM 58502B106 221,837 25,676 13.09 4,661 1.19 0.0068
2022-05-12 2022-03-31 13F MEDNAX COM 58502B106 196,161 8,179 4.35 4,606 -9.95 0.0059
2022-02-10 2021-12-31 13F MEDNAX COM 58502B106 187,982 5,493 3.01 5,115 -1.41 0.0063
2021-11-12 2021-09-30 13F MEDNAX COM 58502B106 182,489 -32,678 -15.19 5,188 -20.02 0.0070
2021-08-05 2021-06-30 13F MEDNAX COM 58502B106 215,167 -22,516 -9.47 6,487 7.15 0.0085
2021-05-06 2021-03-31 13F MEDNAX COM 58502B106 237,683 -3,099 -1.29 6,054 2.45 0.0082
2021-02-10 2020-12-31 13F MEDNAX COM 58502B106 240,782 -30,674 -11.30 5,909 33.72 0.0082
2020-11-12 2020-09-30 13F MEDNAX COM 58502B106 271,456 -31,605 -10.43 4,419 -14.72 0.0069
2020-08-13 2020-06-30 13F MEDNAX COM 58502B106 303,061 68,690 29.31 5,182 89.96 0.0087
2020-05-06 2020-03-31 13F MEDNAX COM 58502B106 234,371 18,050 8.34 2,728 -54.62 0.0057
2020-02-05 2019-12-31 13F MEDNAX COM 58502B106 216,321 3,045 1.43 6,012 24.63 0.0101
2019-10-23 2019-09-30 13F MEDNAX COM 58502B106 213,276 -5,759 -2.63 4,824 -12.70 0.0088
2019-08-14 2019-06-30 13F MEDNAX COM 58502B106 219,035 -7,228 -3.19 5,526 -10.12 0.0104
2019-05-01 2019-03-31 13F MEDNAX COM 58502B106 226,263 -13,260 -5.54 6,148 -22.22 0.0119
2019-01-31 2018-12-31 13F MEDNAX COM 58502B106 239,523 67,867 39.54 7,904 -1.31 0.0172
2018-11-07 2018-09-30 13F MEDNAX COM 58502B106 171,656 -2,817 -1.61 8,009 6.07 0.0155
2018-08-06 2018-06-30 13F MEDNAX COM 58502B106 174,473 -10,216 -5.53 7,551 -26.50 0.0152
2018-05-02 2018-03-31 13F MEDNAX COM 58502B106 184,689 -7,140 -3.72 10,274 0.22 0.0215
2018-02-09 2017-12-31 13F MEDNAX COM 58502B106 191,829 -15,730 -7.58 10,251 14.54 0.0208
2017-11-06 2017-09-30 13F MEDNAX COM 58502B106 207,559 17,987 9.49 8,950 -21.79 0.0195
2017-08-02 2017-06-30 13F MEDNAX COM 58502B106 189,572 -17,810 -8.59 11,444 -20.46 0.0261
2017-05-02 2017-03-31 13F MEDNAX COM 58502B106 207,382 14,353 7.44 14,388 11.82 0.0336
2017-01-27 2016-12-31 13F MEDNAX COM 58502B106 193,029 9,426 5.13 12,867 5.78 0.0326
2016-11-08 2016-09-30 13F MEDNAX COM 58502B106 183,603 5,805 3.26 12,164 -5.54 0.0335
2016-08-11 2016-06-30 13F MEDNAX COM 58502B106 177,798 4,708 2.72 12,878 15.14 0.0382
2016-05-02 2016-03-31 13F MEDNAX INC USD.01 COM 58502B106 173,090 -140 -0.08 11,185 -9.90 0.0347
2016-02-03 2015-12-31 13F MEDNAX INC USD.01 COM 58502B106 173,230 3,849 2.27 12,414 -4.56 0.0399
2015-11-04 2015-09-30 13F MEDNAX INC USD.01 COM 58502B106 169,381 5,149 3.14 13,007 6.87 0.0443
2015-08-04 2015-06-30 13F MEDNAX INC USD.01 COM 58502B106 164,232 19,414 13.41 12,171 15.90 0.0388
2015-05-12 2015-03-31 13F MEDNAX INC USD.01 COM 58502B106 144,818 12,800 9.70 10,501 20.31 0.0303
2015-02-06 2014-12-31 13F MEDNAX INC USD.01 COM 58502B106 132,018 2,560 1.98 8,728 22.98 0.0254
2014-11-12 2014-09-30 13F MEDNAX INC USD.01 COM 58502B106 129,458 -1,843 -1.40 7,097 -7.05 0.0213
2014-08-06 2014-06-30 13F MEDNAX INC USD.01 COM 58502B106 131,301 -15,178 -10.36 7,635 -15.90 0.0224
2014-05-06 2014-03-31 13F MEDNAX INC USD.01 COM 58502B106 146,479 -2,719 -1.82 9,079 14.00 0.0269
2014-02-03 2013-12-31 13F MEDNAX INC USD.01 COM 58502B106 149,198 67,363 82.32 7,964 -3.07 0.0235
2013-11-05 2013-09-30 13F MEDNAX INC USD.01 COM 58502B106 81,835 597 0.73 8,216 10.43 0.0255
2013-08-07 2013-06-30 13F MEDNAX INC USD.01 COM 58502B106 81,238 81,238 7,440 0.0239
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.