Prosperity Bancshares, Inc.
US ˙ NYSE ˙ US7436061052

SecurityPB / Prosperity Bancshares, Inc.
InstitutionPort Capital LLC
Latest Disclosed Ownership511,855 shares
Latest Disclosed Value $ 34,386,419
Port Capital LLC reports 0.33% increase in ownership of PB / Prosperity Bancshares, Inc.

On May 15, 2026 - Port Capital LLC filed a 13F-HR form disclosing ownership of 511,855 shares of Prosperity Bancshares, Inc. (US:PB) valued at $34,386,419 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 510,153 shares of Prosperity Bancshares, Inc.. This represents a change in shares of 0.33% during the quarter. The current value of the position is $35,190,031 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.

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)
2026-05-15 2026-03-31 13F PROSPERITY BANCSHARES COM 743606105 511,855 1,702 0.33 34,386 -2.47 1.5291
2026-02-17 2025-12-31 13F PROSPERITY BANCSHARES COM 743606105 510,153 -42,930 -7.76 35,257 -3.93 1.5205
2025-11-14 2025-09-30 13F PROSPERITY BANCSHARES COM 743606105 553,083 4,875 0.89 36,697 -4.70 1.5294
2025-08-14 2025-06-30 13F PROSPERITY BANCSHARES COM 743606105 548,208 3,675 0.67 38,506 -0.92 1.6374
2025-05-15 2025-03-31 13F PROSPERITY BANCSHARES COM 743606105 544,533 5,440 1.01 38,863 -4.33 1.7620
2025-02-14 2024-12-31 13F PROSPERITY BANCSHARES COM 743606105 539,093 15,850 3.03 40,621 7.72 1.8540
2024-11-14 2024-09-30 13F PROSPERITY BANCSHARES COM 743606105 523,243 1,450 0.28 37,710 18.21 1.6902
2024-08-14 2024-06-30 13F PROSPERITY BANCSHARES INC COM COM 743606105 521,793 -6,600 -1.25 31,902 -8.22 1.5984
2024-05-15 2024-03-31 13F PROSPERITY BANCSHARES INC COM COM 743606105 528,393 -26,495 -4.77 34,758 -7.52 1.7423
2024-02-15 2023-12-31 13F PROSPERITY BANCSHARES INC COM COM 743606105 554,888 4,300 0.78 37,583 25.06 2.0966
2023-11-14 2023-09-30 13F PROSPERITY BANCSHARES INC COM COM 743606105 550,588 8,625 1.59 30,051 -1.83 1.8756
2023-08-14 2023-06-30 13F PROSPERITY BANCSHARES INC COM COM 743606105 541,963 7,450 1.39 30,610 -6.91 1.8416
2023-05-15 2023-03-31 13F PROSPERITY BANCSHARES INC COM COM 743606105 534,513 33,158 6.61 32,883 -9.76 2.1369
2023-02-15 2022-12-31 13F PROSPERITY BANCSHARES INC COM COM 743606105 501,355 22,718 4.75 36,438 14.17 2.6339
2022-11-14 2022-09-30 13F PROSPERITY BANCSHARES INC COM COM 743606105 478,637 11,900 2.55 31,916 0.16 2.5913
2022-08-15 2022-06-30 13F PROSPERITY BANCSHARES INC COM COM 743606105 466,737 -4,865 -1.03 31,864 -2.62 2.4951
2022-05-16 2022-03-31 13F PROSPERITY BANCSHARES INC COM COM 743606105 471,602 -43,838 -8.50 32,720 -12.20 2.2622
2022-02-14 2021-12-31 13F PROSPERITY BANCSHARES INC COM COM 743606105 515,440 -441,911 -46.16 37,266 -45.27 2.2919
2021-11-15 2021-09-30 13F PROSPERITY BANCSHARES INC COM COM 743606105 957,351 -8,697 -0.90 68,096 -1.83 3.4372
2021-08-16 2021-06-30 13F PROSPERITY BANCSHARES INC COM COM 743606105 966,048 28,236 3.01 69,362 -1.24 3.6115
2021-05-17 2021-03-31 13F PROSPERITY BANCSHARES INC COM COM 743606105 937,812 -3,840 -0.41 70,233 7.53 3.9762
2021-02-16 2020-12-31 13F PROSPERITY BANCSHARES INC COM COM 743606105 941,652 -34,178 -3.50 65,313 29.14 4.4446
2020-11-16 2020-09-30 13F PROSPERITY BANCSHARES INC COM COM 743606105 975,830 213,083 27.94 50,577 11.67 4.3574
2020-08-17 2020-06-30 13F/A-1 PROSPERITY BANCSHARES INC COM COM 743606105 762,747 235,280 44.61 45,292 77.96 4.3648
2020-08-14 2020-06-30 13F PROSPERITY BANCSHARES INC COM COM 743606105 565,350 37,883 33,570 3,891,068.6240
2020-05-15 2020-03-31 13F PROSPERITY BANCSHARES INC COM COM 743606105 527,467 80,650 18.05 25,450 -20.77 3.5397
2020-02-14 2019-12-31 13F PROSPERITY BANCSHARES INC COM COM 743606105 446,817 446,817 32,122 3.5446
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.