Simon Property Group, Inc.
MX ˙ BMV ˙ US8288061091
SecurityMX:SPG / Simon Property Group, Inc.
InstitutionWeiss Asset Management LP
Latest Disclosed Ownership151,181 shares
Latest Disclosed Value $ 28,199,792
Weiss Asset Management LP reports 38.96% decrease in ownership of SPG / Simon Property Group, Inc.

On May 15, 2026 - Weiss Asset Management LP filed a 13F-HR form disclosing ownership of 151,181 shares of Simon Property Group, Inc. (MX:SPG) valued at $28,199,792 USD as of March 31, 2026. The entity filed a previous 13F-HR on August 14, 2025 disclosing 247,691 shares of Simon Property Group, Inc.. This represents a change in shares of -38.96% during the quarter.

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 SIMON PPTY GROUP INC COM 828806109 151,181 -96,510 -38.96 28,200 -29.18 0.4769
2025-08-14 2025-06-30 13F SIMON PPTY GROUP INC COM 828806109 247,691 246,068 15,161.31 39,819 14,171.68 0.4597
2025-02-14 2024-12-31 13F SIMON PPTY GROUP INC COM 828806109 1,623 -114,993 -98.61 279 -98.58 0.0057
2024-11-14 2024-09-30 13F SIMON PPTY GROUP INC COM 828806109 116,616 116,616 19,710 0.4541
2020-05-14 2020-03-31 13F SIMON PPTY GROUP INC COM 828806109 0 -1,757 -100.00 0 -100.00
2020-02-14 2019-12-31 13F SIMON PPTY GROUP INC COM 828806109 1,757 0 0.00 262 -4.03 0.0177
2019-11-14 2019-09-30 13F SIMON PPTY GROUP INC COM 828806109 1,757 1,757 273 0.0218
2019-08-14 2019-06-30 13F SIMON PPTY GROUP INC COM 828806109 0 -1,148 -100.00 0 -100.00
2019-05-17 2019-03-31 13F/A-1 SIMON PPTY GROUP INC COM 828806109 1,148 1,148 209 0.0164
2019-05-15 2019-03-31 13F SIMON PPTY GROUP INC COM 828806109 1,148 209
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.