Western Midstream Partners, LP - Limited Partnership
US ˙ NYSE ˙ US9586691035

SecurityWES / Western Midstream Partners, LP - Limited Partnership
InstitutionAlps Advisors Inc
Latest Disclosed Ownership38,637,354 shares
Ownership 9.82%
Alps Advisors Inc ownership in WES / Western Midstream Partners, LP - Limited Partnership

2026-04-08 - Alps Advisors Inc has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 38,637,354 shares of Western Midstream Partners, LP - Limited Partnership (US:WES). This represents 9.82 percent ownership of the company. In their previous filing dated 2026-01-06 , Alps Advisors Inc had reported owning 35,074,357 shares, indicating an increase of 10.16 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2026-04-08 2026-04-08 13G/A 35,074,357 38,637,354 10.16 9.82 14.19
2026-01-06 2026-01-06 13G/A 34,774,726 35,074,357 0.86 8.60 -5.91
2025-10-07 2025-10-07 13G/A 34,675,907 34,774,726 0.28 9.14 0.33
2025-07-09 2025-07-09 13G/A 33,824,487 34,675,907 2.52 9.11 2.47
2025-04-09 2025-04-09 13G/A 31,423,596 33,824,487 7.64 8.89 7.63
2025-02-13 2025-02-13 13G/A 28,371,183 31,423,596 10.76 8.26 10.58
2024-11-13 2024-11-13 13G/A 32,322,784 28,371,183 -12.23 7.47 -12.32
2024-02-05 2024-02-05 13G/A 25,442,166 32,322,784 27.04 8.52 29.09
2023-02-13 2023-02-13 13G/A 24,330,966 25,442,166 4.57 6.60 10.74
2022-02-03 2022-02-03 13G 24,153,629 24,330,966 0.73 5.96 -2.30
2021-02-09 2021-02-09 13G/A 24,153,629 24,153,629 0.00 6.10 14.45
2020-02-07 2020-02-07 13G/A 9,954,452 24,153,629 142.64 5.33 -10.72
2019-02-04 2019-02-04 13G/A 8,329,599 9,954,452 19.51 5.97
2018-02-06 2018-02-06 13G 8,329,599 5.46

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-08 2026-03-31 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 38,637,354 3,562,997 10.16 1,590,700 14.82 6.8701
2026-02-12 2025-12-31 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 35,074,357 299,631 0.86 1,385,437 1.40 8.0687
2025-11-05 2025-09-30 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 34,774,726 98,819 0.28 1,366,299 1.81 7.6082
2025-08-11 2025-06-30 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 34,675,907 851,420 2.52 1,341,958 -3.14 7.7407
2025-04-30 2025-03-31 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 33,824,487 2,400,891 7.64 1,385,451 14.73 8.0340
2025-02-13 2024-12-31 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 31,423,596 3,052,413 10.76 1,207,609 11.25 7.6214
2024-11-12 2024-09-30 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 28,371,183 467,889 1.68 1,085,481 -2.09 7.2648
2024-08-13 2024-06-30 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 27,903,294 -2,241,233 -7.43 1,108,598 3.45 7.6096
2024-05-14 2024-03-31 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 30,144,527 -2,178,257 -6.74 1,071,638 13.31 7.5859
2024-02-14 2023-12-31 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 32,322,784 -1,196,760 -3.57 945,765 3.62 7.4363
2023-11-14 2023-09-30 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 33,519,544 3,855,558 13.00 912,737 16.02 7.5748
2023-08-14 2023-06-30 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 29,663,986 526,804 1.81 786,689 2.39 6.8340
2023-05-10 2023-03-31 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 29,137,182 3,695,016 14.52 768,347 12.48 6.7887
2023-02-14 2022-12-31 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 25,442,166 1,760,145 7.43 683,122 14.65 6.0936
2022-11-14 2022-09-30 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 23,682,021 -493,368 -2.04 595,840 1.38 5.6377
2022-08-15 2022-06-30 13F/A-1 WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 24,175,389 24,175,389 587,704 5.7142
2022-08-11 2022-06-30 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 24,175,389 24,175,389 587,704 5.6254
2022-05-13 2022-03-31 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 0 -24,295,766 -100.00 0 -100.00
2022-02-09 2021-12-31 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 24,295,766 -377,567 -1.53 541,067 4.62 6.0878
2021-11-15 2021-09-30 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 24,673,333 -1,864,675 -7.03 517,153 -9.02 4.9831
2021-08-11 2021-06-30 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 26,538,008 -54,813 -0.21 568,444 14.99 5.0273
2021-05-07 2021-03-31 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 26,592,821 1,215,866 4.79 494,361 40.96 4.8284
2021-02-03 2020-12-31 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 25,376,955 1,187,907 4.91 350,710 81.23 3.9495
2020-11-05 2020-09-30 13F/A-1 WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 24,189,048 -383,936 -1.56 193,512 -21.56 2.8487
2020-11-04 2020-09-30 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 24,189,048 -383,936 193,512 2,480,088.1139
2020-08-05 2020-06-30 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 24,572,984 -1,512,718 -5.80 246,713 191.91 3.3077
2020-05-06 2020-03-31 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 26,085,702 1,932,073 8.00 84,518 -82.23 1.3075
2020-02-07 2019-12-31 13F WESTERN MIDSTREAM PARTNERS L COM UNIT LP INT 958669103 24,153,629 -139,669 -0.57 475,585 -21.35 3.7070
2019-11-04 2019-09-30 13F WESTERN MIDSTREA COMMON STOCK 958669103 24,293,298 6,677,468 37.91 604,660 11.55 4.7076
2019-08-07 2019-06-30 13F WESTERN MIDSTREA COMMON STOCK 958669103 17,615,830 -1,454,594 -7.63 542,039 -9.37 4.0120
2019-05-01 2019-03-31 13F WESTERN MIDSTREA COMMON STOCK 958669103 19,070,424 9,115,972 91.58 598,048 42.26 4.2343
2019-02-04 2018-12-31 13F WESTERN GAS PART COMMON STOCK 958254104 9,954,452 1,115,194 12.62 420,377 8.88 3.2621
2019-02-04 2018-12-31 13F WESTERN GAS EQUI COMMON STOCK 95825R103 57,553 3,622 1,596 0.0124
2018-10-25 2018-09-30 13F WESTERN GAS PART COMMON STOCK 958254104 8,839,258 517,576 6.22 386,099 -4.12 2.5331
2018-10-25 2018-09-30 13F WESTERN GAS EQUI COMMON STOCK 95825R103 53,931 18,332 1,615 0.0106
2018-08-02 2018-06-30 13F/A-2 Western Gas Partners COMMON STOCK 958254104 8,321,682 457,158 5.81 402,686 20.00 2.6266
2018-08-02 2018-06-30 13F/A-2 Western Gas Equity Partners COMMON STOCK 95825R103 35,599 6,360 1,273 0.0083
2018-07-31 2018-06-30 13F/A-1 Western Gas Partners COMMON STOCK 958254104 8,329,599 8,294,000 400,570 2.5613
2018-07-31 2018-06-30 13F/A-1 Western Gas Equity Partners COMMON STOCK 95825R103 28,901 -8,300,698 1,074 0.0069
2018-07-25 2018-06-30 13F Western Gas Partners COMMON STOCK 958254104 8,329,599 465,075 400,570
2018-07-25 2018-06-30 13F Western Gas Equity Partners COMMON STOCK 95825R103 28,901 -338 1,074
2018-05-01 2018-03-31 13F Western Gas Partners COMMON STOCK 958254104 7,864,524 -465,075 -5.58 335,579 -16.22 2.6704
2018-05-01 2018-03-31 13F Western Gas Equity Partners COMMON STOCK 95825R103 29,239 338 968 0.0077
2018-02-20 2017-12-31 13F/A-1 Western Gas Partners COMMON STOCK 958254104 8,329,599 195,137 2.40 400,570 -3.97 2.7732
2018-02-20 2017-12-31 13F/A-1 Western Gas Equity Partners COMMON STOCK 95825R103 28,901 1,438 1,074 0.0074
2018-02-05 2017-12-31 13F Western Gas Partners COMMON STOCK 958254104 8,329,599 195,137 400,570
2018-02-05 2017-12-31 13F Western Gas Equity Partners COMMON STOCK 95825R103 28,901 1,438 1,074
2017-11-03 2017-09-30 13F Western Gas Partners COMMON STOCK 958254104 8,134,462 815,295 11.14 417,135 1.88 2.9562
2017-11-03 2017-09-30 13F Western Gas Equity Partners COMMON STOCK 95825R103 27,463 840 1,131 0.0080
2017-08-03 2017-06-30 13F Western Gas Partners COMMON STOCK 958254104 7,319,167 1,024,568 16.28 409,434 15.78 2.8565
2017-08-03 2017-06-30 13F Western Gas Equity Partners COMMON STOCK 95825R103 26,623 532 1,145 0.0080
2017-05-12 2017-03-31 13F Western Gas Partners COMMON STOCK 958254104 6,294,599 1,033,752 19.65 353,632 14.40 2.4386
2017-05-12 2017-03-31 13F Western Gas Equity Partners COMMON STOCK 95825R103 26,091 11,231 1,117 0.0077
2017-01-24 2016-12-31 13F Western Gas Partners Common Stock 958254104 5,260,847 316,413 6.40 309,127 13.57 2.2795
2017-01-24 2016-12-31 13F Western Gas Equity Partners Common Stock 95825R103 14,860 741 629 0.0046
2016-11-02 2016-09-30 13F Western Gas Partners MLP Common Stock 958254104 4,944,434 115,888 2.40 272,191 11.85 2.2216
2016-11-02 2016-09-30 13F Western Gas Equity Partners Common Stock 95825R103 14,119 4,371 600 0.0049
2016-07-27 2016-06-30 13F Western Gas Partners MLP Common Stock 958254104 4,828,546 -316,799 -6.16 243,359 8.95 2.1563
2016-07-27 2016-06-30 13F Western Gas Equity Common Stock 95825R103 9,748 -5,135,597 373 0.0033
2016-05-10 2016-03-31 13F Western Gas Partners MLP Common Stock 958254104 5,145,345 -891,076 -14.76 223,359 -22.15 2.3063
2016-02-05 2015-12-31 13F Western Gas Partners MLP Common Stock 958254104 6,036,421 489,602 8.83 286,911 -88.95 2.7997
2016-02-05 2015-12-31 13F Western Gas Equity Common Stock 95825R103 6,962 -696 253 0.0025
2015-11-13 2015-09-30 13F Western Gas Partners MLP Common Stock 958254104 5,546,819 41,962 0.76 2,597,021 644.47 2.7361
2015-11-13 2015-09-30 13F Western Gas Equity Common Stock 95825R103 7,658 53 3,020 0.0032
2015-08-12 2015-06-30 13F Western Gas Partners MLP Common Stock 958254104 5,504,857 368,113 7.17 348,843 3.13 2.9765
2015-08-12 2015-06-30 13F Western Gas Equity Common Stock 95825R103 7,605 -5,129,139 456 0.0039
2015-05-15 2015-03-31 13F Western Gas Partners MLP Common Stock 958254104 5,136,744 208,437 4.23 338,255 -6.04 2.7698
2015-02-13 2014-12-31 13F Western Gas Partners MLP Common Stock 958254104 4,928,307 1,221,131 32.94 360,013 29.48 2.8323
2014-12-18 2014-09-30 13F/A-1 WESTERN GAS PARTNERS Common Stock 958254104 3,707,176 137,493 3.85 278,038 1.84 2.1597
2014-11-24 2014-09-30 13F WESTERN GAS PARTNERS Common Stock 958254104 3,669,695 275,227
2014-08-20 2014-06-30 13F/A-1 WESTERN GAS PARTNERS Common Stock 958254104 3,569,683 84,180 2.42 273,009 18.34 2.3438
2014-08-15 2014-06-30 13F ENERGY SELECT SECTOR SPDR ETF 958254104 429,568 28,466
2014-05-15 2014-03-31 13F Western Gas Partners MLP Common Stock 958254104 3,485,503 -129,646 -3.59 230,706 7.31 2.2513
2014-02-11 2013-12-31 13F WESTERN GAS PARTNERS Common Stock 958254104 3,615,149 433,959 13.64 214,981 12.39 2.1748
2013-11-13 2013-09-30 13F WESTERN GAS PARTNERS Common Stock 958254104 3,181,190 67,811 2.18 191,285 -5.32 2.1448
2013-08-02 2013-06-30 13F WESTERN GAS PARTNERS Common Stock 958254104 3,113,379 3,113,379 202,027 2.5013
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.