SPDR Series Trust - State Street SPDR Bloomberg 1-3 Month T-Bill ETF
US ˙ ARCA ˙ US78468R6633

SecurityBIL / SPDR Series Trust - State Street SPDR Bloomberg 1-3 Month T-Bill ETF
InstitutionMain Management LLC
Latest Disclosed Ownership2,379 shares
Latest Disclosed Value $ 218
Main Management LLC reports 25.61% decrease in ownership of BIL / SPDR Series Trust - State Street SPDR Bloomberg 1-3 Month T-Bill ETF

On May 14, 2026 - Main Management LLC filed a 13F-HR form disclosing ownership of 2,379 shares of SPDR Series Trust - State Street SPDR Bloomberg 1-3 Month T-Bill ETF (US:BIL) valued at $218,012 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 3,198 shares of SPDR Series Trust - State Street SPDR Bloomberg 1-3 Month T-Bill ETF. The current value of the position is $217,548 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)
2026-05-14 2026-03-31 13F US TREASURIES BIL 78468R663 2,379 -819 -25.61 0 0.0159
2026-02-10 2025-12-31 13F US TREASURIES COM 78468R663 3,198 -108 -3.27 0 0.0210
2025-11-14 2025-09-30 13F US TREASURIES COM 78468R663 3,306 -1,080 -24.62 0 0.0222
2025-08-12 2025-06-30 13F US TREASURIES COM 78468R663 4,386 -234 -5.06 0 0.0316
2025-05-15 2025-03-31 13F US TREASURIES COM 78468R663 4,620 -28,875 -86.21 0 -100.00 0.0373
2025-02-14 2024-12-31 13F US TREASURIES COM 78468R663 33,495 7,042 26.62 3 50.00 0.2502
2024-11-15 2024-09-30 13F US TREASURIES BIL 78468R663 26,453 9,272 53.97 2 100.00 0.1997
2024-08-15 2024-06-30 13F US TREASURIES BIL 78468R663 17,181 -8,907 -34.14 2 -50.00 0.1304
2024-05-15 2024-03-31 13F US TREASURIES BIL 78468R663 26,088 1,236 4.97 2 0.00 0.2044
2024-02-15 2023-12-31 13F US TREASURIES BIL 78468R663 24,852 9,004 56.81 2 100.00 0.2229
2023-11-14 2023-09-30 13F US TREASURIES BIL 78468R663 15,848 -20,973 -56.96 1 -66.67 0.1475
2023-08-14 2023-06-30 13F US TREASURIES BIL 78468R663 36,821 -21,700 -37.08 3 -40.00 0.3434
2023-05-12 2023-03-31 13F US TREASURIES BIL 78468R663 58,521 58,521 5 0.5700
2022-08-11 2022-06-30 13F US TREASURIES COM 78468R663 0 -59,051 -100.00 0 -100.00
2022-05-11 2022-03-31 13F US TREASURIES COM 78468R663 59,051 59,051 5,399 0.5570
2021-11-16 2021-09-30 13F/A-1 US SECTOR ROTATION COM 78468R663 0 -27,315 -100.00 0 -100.00
2021-11-12 2021-09-30 13F US SECTOR ROTATION COM 78468R663 0 -27,315 0
2021-08-13 2021-06-30 13F US SECTOR ROTATION COM 78468R663 27,315 -2,673 -8.91 2,499 -8.93 0.2685
2021-05-14 2021-03-31 13F US TREASURIES COM 78468R663 29,988 3,671 13.95 2,744 13.91 0.3050
2021-02-12 2020-12-31 13F US TREASURIES COM 78468R663 26,317 -11,198 -29.85 2,409 -29.83 0.3084
2020-11-13 2020-09-30 13F US TREASURIES COM 78468R663 37,515 -65,674 -63.64 3,433 -63.65 0.4821
2020-08-14 2020-06-30 13F US TREASURIES COM 78468R663 103,189 -31,045 -23.13 9,445 -23.21 1.4941
2020-05-11 2020-03-31 13F US TREASURIES COM 78468R663 134,234 -234,757 -63.62 12,300 -63.54 2.2694
2020-02-12 2019-12-31 13F US TREASURIES COM 78468R663 368,991 -62,154 -14.42 33,737 -14.57 4.5364
2019-11-07 2019-09-30 13F US TREASURIES COM 78468R663 431,145 203,213 89.16 39,489 89.11 5.4879
2019-08-08 2019-06-30 13F US TREASURIES COM 78468R663 227,932 48,886 27.30 20,881 27.32 3.0364
2019-05-13 2019-03-31 13F US TREASURIES COM 78468R663 179,046 15,004 9.15 16,401 9.32 2.4153
2019-02-06 2018-12-31 13F US TREASURIES COM 78468R663 164,042 -53,536 -24.61 15,003 -24.70 2.2944
2018-11-09 2018-09-30 13F US TREASURIES COM 78468R663 217,578 -60,577 -21.78 19,925 -21.78 2.8700
2018-07-31 2018-06-30 13F US TREASURIES COM 78468R663 278,155 44,757 19.18 25,473 19.21 3.4302
2018-05-07 2018-03-31 13F US TREASURIES COM 78468R663 233,398 21,830 10.32 21,368 10.50 2.9256
2018-02-08 2017-12-31 13F US TREASURIES COM 78468R663 211,568 211,568 19,337 2.8094
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.