Mueller Industries, Inc.
US ˙ NYSE ˙ US6247561029

SecurityMLI / Mueller Industries, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership1,281,839 shares
Latest Disclosed Value $ 142,027,998
Morgan Stanley reports 22.76% decrease in ownership of MLI / Mueller Industries, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 1,281,839 shares of Mueller Industries, Inc. (US:MLI) valued at $142,027,761 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 1,659,496 shares of Mueller Industries, Inc.. This represents a change in shares of -22.76% during the quarter. The current value of the position is $169,946,215 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)
2026-05-15 2026-03-31 13F MUELLER INDS COM 624756102 1,281,839 -377,657 -22.76 142,028 -25.45 0.0086
2026-05-27 2025-12-31 13F/A-1 MUELLER INDS COM 624756102 1,659,496 146,460 9.68 190,510 24.53 0.0114
2026-02-13 2025-12-31 13F MUELLER INDS COM 624756102 1,659,496 146,460 190,510 0.0114
2026-05-27 2025-09-30 13F/A-1 MUELLER INDS COM 624756102 1,513,036 230,294 17.95 152,983 50.07 0.0093
2025-11-14 2025-09-30 13F MUELLER INDS COM 624756102 1,513,036 230,294 152,983 0.0093
2025-08-15 2025-06-30 13F MUELLER INDS COM 624756102 1,282,742 -65,289 -4.84 101,940 -0.68 0.0066
2025-05-15 2025-03-31 13F MUELLER INDS COM 624756102 1,348,031 68,618 5.36 102,639 1.09 0.0073
2025-05-15 2024-12-31 13F/A-1 MUELLER INDS COM 624756102 1,279,413 -413,758 -24.44 101,534 -19.07 0.0071
2025-02-14 2024-12-31 13F MUELLER INDS COM 624756102 1,279,413 -413,758 101,534 0.0071
2025-05-14 2024-09-30 13F/A-2 MUELLER INDS COM 624756102 1,693,171 167,097 10.95 125,464 44.39 0.0091
2025-02-14 2024-09-30 13F/A-1 MUELLER INDS COM 624756102 1,693,171 167,097 125,464 0.0091
2024-11-14 2024-09-30 13F MUELLER INDS COM 624756102 1,693,171 167,097 125,464 0.0011
2025-05-14 2024-06-30 13F/A-2 MUELLER INDS COM 624756102 1,526,074 -21,489 -1.39 86,895 4.11 0.0067
2024-10-17 2024-06-30 13F/A-1 MUELLER INDS COM 624756102 1,526,074 -21,489 86,895 0.0067
2024-08-14 2024-06-30 13F MUELLER INDS COM 624756102 1,526,074 -21,489 86,895 0.0067
2024-10-17 2024-03-31 13F/A-2 MUELLER INDS COM 624756102 1,547,563 -113,276 -6.82 83,460 6.58 0.0067
2024-08-16 2024-03-31 13F/A-1 MUELLER INDS COM 624756102 1,547,563 -113,276 83,460 0.0008
2024-05-15 2024-03-31 13F MUELLER INDS COM 624756102 1,547,563 -113,276 83,460 0.0067
2024-08-16 2023-12-31 13F/A-1 MUELLER INDS COM 624756102 1,660,839 927,511 126.48 78,309 42.08 0.0069
2024-02-13 2023-12-31 13F MUELLER INDS COM 624756102 1,660,839 927,511 78,309 0.0069
2023-11-15 2023-09-30 13F MUELLER INDS COM 624756102 733,328 56,267 8.31 55,117 -6.73 0.0056
2023-08-14 2023-06-30 13F MUELLER INDS COM 624756102 677,061 21,230 3.24 59,094 22.63 0.0058
2023-05-15 2023-03-31 13F MUELLER INDS COM 624756102 655,831 7,644 1.18 48,191 26.01 0.0052
2023-02-14 2022-12-31 13F MUELLER INDS COM 624756102 648,187 44,109 7.30 38,243 6.51 0.0043
2022-11-14 2022-09-30 13F MUELLER INDS COM 624756102 604,078 108,422 21.87 35,907 35.94 0.0049
2022-10-27 2022-06-30 13F/A-1 MUELLER INDS COM 624756102 495,656 60,558 13.92 26,414 12.08 0.0034
2022-08-15 2022-06-30 13F MUELLER INDS COM 624756102 495,656 60,558 26,414 0.0007
2022-10-27 2022-03-31 13F/A-1 MUELLER INDS COM 624756102 435,098 182,801 72.45 23,568 57.37 0.0032
2022-05-13 2022-03-31 13F MUELLER INDS COM 624756102 435,098 182,801 23,568 0.0032
2022-02-14 2021-12-31 13F MUELLER INDS COM 624756102 252,297 -17,134 -6.36 14,976 35.24 0.0018
2021-11-15 2021-09-30 13F MUELLER INDS COM 624756102 269,431 12,197 4.74 11,074 -0.60 0.0015
2021-08-23 2021-06-30 13F/A-1 MUELLER INDS COM 624756102 257,234 99,274 62.85 11,141 70.56 0.0015
2021-08-16 2021-06-30 13F MUELLER INDS COM 624756102 257,234 99,274 11,141 0.0003
2021-05-17 2021-03-31 13F MUELLER INDS COM 624756102 157,960 -33,104 -17.33 6,532 -2.64 0.0010
2021-02-16 2020-12-31 13F MUELLER INDS COM 624756102 191,064 40,672 27.04 6,709 64.88 0.0010
2020-11-13 2020-09-30 13F MUELLER INDS COM 624756102 150,392 -240,993 -61.57 4,069 -60.89 0.0008
2020-08-14 2020-06-30 13F MUELLER INDS COM 624756102 391,385 118,298 43.32 10,403 59.14 0.0023
2020-05-26 2020-03-31 13F/A-1 MUELLER INDS COM 624756102 273,087 -16,556 -5.72 6,537 -28.91 0.0018
2020-05-15 2020-03-31 13F MUELLER INDS COM 624756102 273,087 -16,556 6,537 502.1779
2020-02-14 2019-12-31 13F MUELLER INDS COM 624756102 289,643 -214,340 -42.53 9,195 -36.38 0.0021
2019-11-14 2019-09-30 13F MUELLER INDS COM 624756102 503,983 235,411 87.65 14,454 83.87 0.0038
2019-08-14 2019-06-30 13F MUELLER INDS COM 624756102 268,572 100,044 59.36 7,861 48.85 0.0021
2019-05-15 2019-03-31 13F MUELLER INDS COM 624756102 168,528 -173,151 -50.68 5,281 -33.83 0.0015
2019-02-14 2018-12-31 13F MUELLER INDS COM 624756102 341,679 107,638 45.99 7,981 17.68 0.0024
2019-04-23 2018-09-30 13F/A-2 MUELLER INDS COM 624756102 234,041 92,554 65.42 6,782 62.44 0.0017
2018-11-20 2018-09-30 13F/A-1 MUELLER INDS COM 624756102 234,041 0 6,782 0.0017
2018-11-14 2018-09-30 13F MUELLER INDS COM 624756102 234,041 92,554 6,782
2019-04-23 2018-06-30 13F/A-1 MUELLER INDS COM 624756102 141,487 -7,130 -4.80 4,175 7.41 0.0011
2018-08-14 2018-06-30 13F MUELLER INDS COM 624756102 141,487 -7,130 4,175
2019-04-23 2018-03-31 13F/A-1 MUELLER INDS COM 624756102 148,617 9,052 6.49 3,887 -21.38 0.0011
2018-05-14 2018-03-31 13F MUELLER INDS COM 624756102 148,617 9,052 3,887
2019-04-23 2017-12-31 13F/A-1 MUELLER INDS COM 624756102 139,565 42,703 44.09 4,944 46.06 0.0014
2018-02-14 2017-12-31 13F MUELLER INDS COM 624756102 139,565 42,703 4,944
2017-11-14 2017-09-30 13F MUELLER INDS COM 624756102 96,862 -71,338 -42.41 3,385 -33.90 0.0010
2017-08-11 2017-06-30 13F MUELLER INDS COM 624756102 168,200 15,741 10.32 5,121 -1.84 0.0015
2017-05-22 2017-03-31 13F/A-1 MUELLER INDS COM 624756102 152,459 -95,189 -38.44 5,217 -47.28 0.0016
2017-05-12 2017-03-31 13F MUELLER INDS COM 624756102 152,459 5,217
2017-02-22 2016-12-31 13F/A-1 MUELLER INDS COM 624756102 247,648 126,544 104.49 9,896 152.06 0.0032
2017-02-13 2016-12-31 13F MUELLER INDS COM 624756102 247,648 9,896
2016-11-10 2016-09-30 13F MUELLER INDS COM 624756102 121,104 6,820 5.97 3,926 7.77 0.0013
2016-08-12 2016-06-30 13F MUELLER INDS COM 624756102 114,284 -48,804 -29.92 3,643 -24.07 0.0013
2016-05-12 2016-03-31 13F MUELLER INDS COM 624756102 163,088 -105,942 -39.38 4,798 -34.19 0.0018
2016-02-09 2015-12-31 13F MUELLER INDS COM 624756102 269,030 -64,229 -19.27 7,291 -26.04 0.0026
2016-02-08 2015-09-30 13F/A-1 MUELLER INDS COM 624756102 333,259 101,844 44.01 9,858 22.69 0.0036
2015-11-09 2015-09-30 13F MUELLER INDS COM 624756102 333,259 9,858
2015-08-12 2015-06-30 13F MUELLER INDS COM 624756102 231,415 38,881 20.19 8,035 15.50 0.0028
2015-05-14 2015-03-31 13F MUELLER INDS COM 624756102 192,534 134,763 233.27 6,957 252.61 0.0026
2015-02-13 2014-12-31 13F MUELLER INDS COM 624756102 57,771 11,723 25.46 1,973 50.27 0.0007
2014-12-16 2014-09-30 13F/A-1 MUELLER INDS COM 624756102 46,048 3,818 9.04 1,313 3.71 0.0005
2014-11-14 2014-09-30 13F MUELLER INDS COM 624756102 46,048 1,313
2014-05-13 2014-03-31 13F MUELLER INDS COM 624756102 42,230 -42,055 -49.90 1,266 -76.16 0.0005
2014-02-13 2013-12-31 13F MUELLER INDS COM 624756102 84,285 -136,487 -61.82 5,310 -56.80 0.0023
2013-11-13 2013-09-30 13F MUELLER INDUSTRIES INC COM COM 624756102 220,772 -58,914 -21.06 12,291 -12.86 0.0058
2013-08-08 2013-06-30 13F MUELLER INDUSTRIES INC COM COM 624756102 279,686 279,686 14,105 0.0071
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.