Mercury Systems, Inc.
US ˙ NasdaqGS ˙ US5893781089

SecurityMRCY / Mercury Systems, Inc.
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership965 shares
Latest Disclosed Value $ 70,349
Advisor Group Holdings, Inc. reports 4.32% increase in ownership of MRCY / Mercury Systems, Inc.

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 965 shares of Mercury Systems, Inc. (US:MRCY) valued at $70,358 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 925 shares of Mercury Systems, Inc.. This represents a change in shares of 4.32% during the quarter. The current value of the position is $107,684 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)
2026-05-15 2026-03-31 13F MERCURY SYS COM 589378108 965 40 4.32 70 4.48 0.0001
2026-02-17 2025-12-31 13F MERCURY SYS COM 589378108 925 -13,491 -93.58 68 -93.14 0.0001
2025-11-14 2025-09-30 13F MERCURY SYS COM 589378108 14,416 13,817 2,306.68 977 2,953.13 0.0014
2025-09-04 2025-06-30 13F/A-1 MERCURY SYS COM 589378108 599 208 53.20 32 100.00 0.0001
2025-08-13 2025-06-30 13F MERCURY SYS COM 589378108 333 -58 14 0.0000
2025-05-12 2025-03-31 13F MERCURY SYS COM 589378108 391 90 29.90 17 33.33 0.0000
2025-06-06 2024-12-31 13F/A-1 MERCURY SYS COM 589378108 301 -1,730 -85.18 13 -84.00 0.0000
2025-02-07 2024-12-31 13F MERCURY SYS COM 589378108 2,001 -30 74 0.0002
2024-11-13 2024-09-30 13F MERCURY SYS COM 589378108 2,031 -2,600 -56.14 75 -39.52 0.0002
2024-08-13 2024-06-30 13F MERCURY SYS COM 589378108 4,631 -278 -5.66 125 -13.89 0.0003
2024-05-10 2024-03-31 13F MERCURY SYS COM 589378108 4,909 -501 -9.26 145 -26.90 0.0003
2024-02-12 2023-12-31 13F MERCURY SYS COM 589378108 5,410 -3,912 -41.97 198 -42.90 0.0003
2023-11-13 2023-09-30 13F MERCURY SYS COM 589378108 9,322 8,023 617.63 346 684.09 0.0005
2023-08-21 2023-06-30 13F/A-1 MERCURY SYS COM 589378108 1,299 -1,385 -51.60 45 -67.88 0.0001
2023-08-10 2023-06-30 13F MERCURY SYS COM 589378108 1,299 -1,385 45 0.0000
2023-05-12 2023-03-31 13F MERCURY SYS COM 589378108 2,684 -276 -9.32 137 4.58 0.0003
2023-02-10 2022-12-31 13F MERCURY SYS COM 589378108 2,960 193 6.98 132 16.96 0.0003
2022-11-14 2022-09-30 13F MERCURY SYS COM 589378108 2,767 2 0.07 112 -36.72 0.0003
2022-08-10 2022-06-30 13F MERCURY SYS COM 589378108 2,765 145 5.53 177 4.73 0.0004
2022-05-04 2022-03-31 13F MERCURY SYS COM 589378108 2,620 -2,115 -44.67 169 -35.25 0.0003
2022-02-03 2021-12-31 13F MERCURY SYS COM 589378108 4,735 -456 -8.78 261 6.10 0.0005
2021-11-05 2021-09-30 13F MERCURY SYS COM 589378108 5,191 1,209 30.36 246 -6.11 0.0005
2021-08-02 2021-06-30 13F MERCURY SYS COM 589378108 3,982 1,143 40.26 262 30.35 0.0006
2021-05-13 2021-03-31 13F MERCURY SYS COM 589378108 2,839 -2,672 -48.48 201 -58.56 0.0005
2021-02-10 2020-12-31 13F MERCURY SYS COM 589378108 5,511 -5,464 -49.79 485 -42.87 0.0013
2020-11-12 2020-09-30 13F MERCURY SYS COM 589378108 10,975 -1,662 -13.15 849 -14.76 0.0025
2020-08-14 2020-06-30 13F MERCURY SYS COM 589378108 12,637 8,887 236.99 996 271.64 0.0033
2020-05-18 2020-03-31 13F MERCURY SYS COM 589378108 3,750 3,750 268 0.0011
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.