Fidelity Merrimack Street Trust - Fidelity Total Bond ETF
US ˙ ARCA ˙ US3161883091

SecurityFBND / Fidelity Merrimack Street Trust - Fidelity Total Bond ETF
InstitutionCitadel Advisors Llc
ManagerKen Griffin
Latest Disclosed Ownership272,762 shares
Latest Disclosed Value $ 12,443,402
Citadel Advisors Llc ownership in FBND / Fidelity Merrimack Street Trust - Fidelity Total Bond ETF

On May 15, 2026 - Citadel Advisors Llc filed a 13F-HR form disclosing ownership of 272,762 shares of Fidelity Merrimack Street Trust - Fidelity Total Bond ETF (US:FBND) valued at $12,443,402 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 0 shares of Fidelity Merrimack Street Trust - Fidelity Total Bond ETF. The current value of the position is $12,353,391 USD.

Citadel Advisors Llc has a history of taking positions in derivatives of the underlying security (FBND) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 0 of underlying shares valued at $0 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.

FBND / Fidelity Merrimack Street Trust - Fidelity Total Bond 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 FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 272,762 272,762 12,443 0.0018
2026-02-17 2025-12-31 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 0 -100.00 0
2025-11-14 2025-09-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 293,309 293,309 13,563 0.0021
2025-08-14 2025-06-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 0 -38,245 -100.00 0 -100.00
2025-05-15 2025-03-31 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 38,245 -331,085 -89.64 1,746 -89.47 0.0003
2025-02-14 2024-12-31 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 369,330 -144,169 -28.08 16,572 -30.95 0.0029
2024-11-14 2024-09-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 513,499 229,160 80.59 24,001 87.87 0.0046
2024-08-14 2024-06-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 284,339 -20,386 -6.69 12,775 -7.47 0.0026
2024-05-15 2024-03-31 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 304,725 304,725 13,807 0.0027
2024-02-14 2023-12-31 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 0 -5,773 -100.00 0 -100.00
2023-11-14 2023-09-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 5,773 -48,700 -89.40 251 -89.85 0.0001
2023-08-14 2023-06-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 54,473 42,571 357.68 2,474 352.29 0.0005
2023-05-15 2023-03-31 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 11,902 11,902 547 0.0001
2022-11-14 2022-09-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 0 -8,457 -100.00 0 -100.00
2022-08-15 2022-06-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 8,457 8,457 394 0.0001
2022-05-16 2022-03-31 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 0 -47,812 -100.00 0 -100.00
2022-02-14 2021-12-31 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 47,812 47,812 2,535 0.0005
2022-03-11 2021-09-30 13F/A-1 FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 0 -50,693 -100.00 0 -100.00
2021-11-15 2021-09-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 0 -50,693 0
2021-08-16 2021-06-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF 316188309 50,693 -448,371 -89.84 2,703 -89.67 0.0006
2021-05-21 2021-03-31 13F/A-1 FIDELITY COVINGTON TRUST TOTAL BD ETF 316188309 499,064 499,064 26,156 0.0064
2021-05-17 2021-03-31 13F FIDELITY COVINGTON TRUST TOTAL BD ETF 316188309 499,064 499,064 26,156 0.0064
2020-11-16 2020-09-30 13F FIDELITY MERRIMACK STR TR Cmn 316188309 0 -187,527 -100.00 0 -100.00
2020-08-14 2020-06-30 13F FIDELITY MERRIMACK STR TR Cmn 316188309 187,527 -42,093 -18.33 10,113 -14.90 0.0036
2020-05-15 2020-03-31 13F FIDELITY Cmn 316188309 229,620 229,620 11,883 0.0053
2020-02-14 2019-12-31 13F FIDELITY Cmn 316188309 0 -13,578 -100.00 0 -100.00
2019-11-14 2019-09-30 13F FIDELITY Cmn 316188309 13,578 -7,077 -34.26 702 -33.40 0.0003
2019-08-14 2019-06-30 13F FIDELITY Cmn 316188309 20,655 20,655 1,054 0.0005
2018-02-09 2017-12-31 13F FIDELITY Cmn 316188309 0 -4,250 -100.00 0 -100.00
2017-11-09 2017-09-30 13F FIDELITY Cmn 316188309 4,250 -11,917 -73.71 214 -73.61 0.0002
2017-08-11 2017-06-30 13F FIDELITY Cmn 316188309 16,167 1,585 10.87 811 11.55 0.0007
2017-05-12 2017-03-31 13F FIDELITY Cmn 316188309 14,582 -10,811 -42.57 727 -42.53 0.0007
2017-02-10 2016-12-31 13F FIDELITY Cmn 316188309 25,393 15,261 150.62 1,265 148.04 0.0013
2017-01-31 2016-06-30 13F/A-1 FIDELITY Cmn 316188309 10,132 10,132 510 0.0006
2016-08-12 2016-06-30 13F FIDELITY TOTAL BOND ETF Cmn 316188309 10,132 510 0.0006
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
(%)
2026-02-17 2025-12-31 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF Call 0 -100.00 0 n/a n/a n/a
2025-11-14 2025-09-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF Call 51,400 225.32 2,377 229.09 n/a n/a n/a
2025-08-14 2025-06-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF Call 15,800 -55.24 723 -55.18 n/a n/a n/a
2025-05-15 2025-03-31 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF Call 35,300 390.28 1,611 398.76 n/a n/a n/a
2025-02-14 2024-12-31 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF Call 7,200 63.64 323 57.56 n/a n/a n/a
2024-11-14 2024-09-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF Call 4,400 41.94 206 47.48 n/a n/a n/a
2024-08-14 2024-06-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF Call 3,100 3,000.00 139 3,375.00 n/a n/a n/a
2024-05-15 2024-03-31 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF Call 100 5 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
(%)
2026-02-17 2025-12-31 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF Put 0 -100.00 0 n/a n/a n/a
2025-11-14 2025-09-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF Put 10,000 462 n/a n/a n/a
2025-08-14 2025-06-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF Put 0 -100.00 0 -100.00 n/a n/a n/a
2025-05-15 2025-03-31 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF Put 1,700 -63.04 78 -62.62 n/a n/a n/a
2025-02-14 2024-12-31 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF Put 4,600 206.67 206 194.29 n/a n/a n/a
2024-11-14 2024-09-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF Put 1,500 -72.22 70 -71.07 n/a n/a n/a
2024-08-14 2024-06-30 13F FIDELITY MERRIMACK STR TR TOTAL BD ETF Put 5,400 243 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.