SPDR Series Trust - State Street Blackstone Senior Loan ETF
US ˙ ARCA ˙ US78467V6083

SecuritySRLN / SPDR Series Trust - State Street Blackstone Senior Loan ETF
InstitutionCitadel Advisors Llc
ManagerKen Griffin
Latest Disclosed Ownership272,389 shares
Latest Disclosed Value $ 10,933,694
Citadel Advisors Llc ownership in SRLN / SPDR Series Trust - State Street Blackstone Senior Loan ETF

On May 15, 2026 - Citadel Advisors Llc filed a 13F-HR form disclosing ownership of 272,389 shares of SPDR Series Trust - State Street Blackstone Senior Loan ETF (US:SRLN) valued at $10,933,694 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 375,672 shares of SPDR Series Trust - State Street Blackstone Senior Loan ETF. This represents a change in shares of -27.49% during the quarter. The current value of the position is $10,977,277 USD.

Citadel Advisors Llc has a history of taking positions in derivatives of the underlying security (SRLN) in the form of stock options. The firm currently holds call options representing 117,800 of underlying shares valued at $4,728,492 USD and put options representing 115,400 of underlying shares valued at $4,632,156 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

SRLN / SPDR Series Trust - State Street Blackstone Senior Loan ETF Historical Put/Call Ratio
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 SSGA ACTIVE ETF TR STATE STREET BLA 78467V608 272,389 -103,283 -27.49 10,934 -29.48 0.0018
2026-02-17 2025-12-31 13F SSGA ACTIVE ETF TR STATE STREET BLA 78467V608 375,672 375,672 15,504 0.0023
2025-11-14 2025-09-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR 78467V608 0 -126,769 -100.00 0 -100.00
2025-08-14 2025-06-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR 78467V608 126,769 10,991 9.49 5,272 10.73 0.0009
2025-05-15 2025-03-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR 78467V608 115,778 -128,852 -52.67 4,762 -53.36 0.0009
2025-02-14 2024-12-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR 78467V608 244,630 103,508 73.35 10,208 73.22 0.0018
2024-11-14 2024-09-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR 78467V608 141,122 132,662 1,568.11 5,893 1,569.41 0.0011
2024-08-14 2024-06-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR 78467V608 8,460 6,092 257.26 354 256.57 0.0001
2024-05-15 2024-03-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR 78467V608 2,368 -71,909 -96.81 100 -96.82 0.0000
2024-02-14 2023-12-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR 78467V608 74,277 74,277 3,114 0.0006
2023-11-14 2023-09-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR 78467V608 0 -2,386 -100.00 0 -100.00
2023-08-14 2023-06-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR 78467V608 2,386 -185,548 -98.73 100 -98.73 0.0000
2023-05-15 2023-03-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR 78467V608 187,934 187,934 7,792 0.0017
2022-05-16 2022-03-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR 78467V608 0 -148,082 -100.00 0 -100.00
2022-02-14 2021-12-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR 78467V608 148,082 148,082 6,757 0.0014
2021-05-21 2021-03-31 13F/A-1 SSGA ACTIVE ETF TR BLKSTN GSOSRLN 78467V608 0 -142,865 -100.00 0 -100.00
2021-02-16 2020-12-31 13F SSGA ACTIVE ETF TR BLKSTN GSOSRLN 78467V608 142,865 142,865 6,522 0.0017
2020-08-14 2020-06-30 13F SSGA ACTIVE ETF TR Cmn 78467V608 0 -16,489 -100.00 0 -100.00
2020-05-15 2020-03-31 13F SSGA ACTIVE ETF TR Cmn 78467V608 16,489 -88,146 -84.24 660 -86.46 0.0003
2020-02-14 2019-12-31 13F SSGA ACTIVE ETF TR Cmn 78467V608 104,635 56,297 116.47 4,874 112.10 0.0021
2017-05-12 2017-03-31 13F SSGA ACTIVE ETF TR Cmn 78467V608 48,338 38,090 371.68 2,298 371.87 0.0021
2017-02-10 2016-12-31 13F SSGA ACTIVE ETF TR Cmn 78467V608 10,248 -26,056 -71.77 487 -71.62 0.0005
2017-01-31 2016-09-30 13F/A-1 SSGA ACTIVE ETF TR Cmn 78467V608 36,304 36,304 0.00 1,716 0.0017
2016-11-10 2016-09-30 13F SPDR BLACKSTONE Cmn 78467V608 36,304 1,716
2017-01-31 2015-12-31 13F/A-1 SPDR BLACKSTONE Cmn 78467V608 0 -6,645 -100.00 0 -100.00
2015-11-16 2015-09-30 13F SPDR BLACKSTONE Cmn 78467V608 6,645 183 2.83 317 0.63 0.0003
2015-06-26 2014-12-31 13F/A-2 SPDR BLACKSTONE Cmn 78467V608 6,462 1,710 35.98 315 34.62 0.0017
2015-06-26 2014-09-30 13F/A-3 SPDR BLACKSTONE Cmn 78467V608 4,752 4,752 234 0.0016
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F SSGA ACTIVE ETF TR STATE STREET BLA Call 117,800 63.84 4,728 59.35 n/a n/a n/a
2026-02-17 2025-12-31 13F SSGA ACTIVE ETF TR STATE STREET BLA Call 71,900 146.23 2,967 144.40 n/a n/a n/a
2025-11-14 2025-09-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Call 29,200 -17.05 1,214 -17.02 n/a n/a n/a
2025-08-14 2025-06-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Call 35,200 340.00 1,464 344.68 n/a n/a n/a
2025-05-15 2025-03-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Call 8,000 -83.44 329 -83.67 n/a n/a n/a
2025-02-14 2024-12-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Call 48,300 -29.39 2,016 -29.45 n/a n/a n/a
2024-11-14 2024-09-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Call 68,400 193.56 2,856 193.53 n/a n/a n/a
2024-08-14 2024-06-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Call 23,300 -7.91 974 -8.64 n/a n/a n/a
2024-05-15 2024-03-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Call 25,300 -16.78 1,065 -16.41 n/a n/a n/a
2024-02-14 2023-12-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Call 30,400 125.19 1,275 125.09 n/a n/a n/a
2023-11-14 2023-09-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Call 13,500 82.43 566 83.17 n/a n/a n/a
2023-08-14 2023-06-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Call 7,400 -69.55 310 -69.31 n/a n/a n/a
2023-05-15 2023-03-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Call 24,300 -77.79 1,007 -77.49 n/a n/a n/a
2023-02-14 2022-12-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Call 109,400 86.37 4,474 86.49 n/a n/a n/a
2022-11-14 2022-09-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Call 58,700 85.17 2,399 81.74 n/a n/a n/a
2022-08-15 2022-06-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Call 31,700 1,320 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F SSGA ACTIVE ETF TR STATE STREET BLA Put 115,400 1,924.56 4,632 1,871.06 n/a n/a n/a
2026-02-17 2025-12-31 13F SSGA ACTIVE ETF TR STATE STREET BLA Put 5,700 -17.39 235 -17.83 n/a n/a n/a
2025-11-14 2025-09-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Put 6,900 -56.60 287 -56.73 n/a n/a n/a
2025-08-14 2025-06-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Put 15,900 -35.37 661 -34.62 n/a n/a n/a
2025-05-15 2025-03-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Put 24,600 112.07 1,012 108.88 n/a n/a n/a
2025-02-14 2024-12-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Put 11,600 70.59 484 71.02 n/a n/a n/a
2024-11-14 2024-09-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Put 6,800 54.55 284 54.64 n/a n/a n/a
2024-08-14 2024-06-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Put 4,400 -99.12 184 -99.13 n/a n/a n/a
2024-05-15 2024-03-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Put 500,200 -64.27 21,063 -64.12 n/a n/a n/a
2024-02-14 2023-12-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Put 1,400,100 179.96 58,706 179.97 n/a n/a n/a
2023-11-14 2023-09-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Put 500,100 -0.34 20,969 -0.20 n/a n/a n/a
2023-08-14 2023-06-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Put 501,800 -1.53 21,010 -0.56 n/a n/a n/a
2023-05-15 2023-03-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Put 509,600 4,077.05 21,128 4,142.57 n/a n/a n/a
2023-02-14 2022-12-31 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Put 12,200 -15.28 499 -15.45 n/a n/a n/a
2022-11-14 2022-09-30 13F SSGA ACTIVE ETF TR BLACKSTONE SENR Put 14,400 589 n/a n/a n/a
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.