Seer, Inc.
US ˙ NasdaqGS ˙ US81578P1066

SecuritySEER / Seer, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership160,879 shares
Latest Disclosed Value $ 270,277
Morgan Stanley reports 6.12% decrease in ownership of SEER / Seer, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 160,879 shares of Seer, Inc. (US:SEER) valued at $270,277 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 171,368 shares of Seer, Inc.. This represents a change in shares of -6.12% during the quarter. The current value of the position is $297,626 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.

Upgrade to unlock premium data and export to Excel .

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 SEER COM CL A 81578P106 160,879 -10,489 -6.12 270 -13.74 0.0000
2026-05-27 2025-12-31 13F/A-1 SEER COM CL A 81578P106 171,368 -19,095 -10.03 314 -24.21 0.0000
2026-02-13 2025-12-31 13F SEER COM CL A 81578P106 171,368 -19,095 314 0.0000
2026-05-27 2025-09-30 13F/A-1 SEER COM CL A 81578P106 190,463 -88,116 -31.63 413 -30.70 0.0000
2025-11-14 2025-09-30 13F SEER COM CL A 81578P106 190,463 -88,116 413 0.0000
2025-08-15 2025-06-30 13F SEER COM CL A 81578P106 278,579 -52,138 -15.77 596 6.81 0.0000
2025-05-15 2025-03-31 13F SEER COM CL A 81578P106 330,717 -252,886 -43.33 559 -58.61 0.0000
2025-05-15 2024-12-31 13F/A-1 SEER COM CL A 81578P106 583,603 372,199 176.06 1,348 224.04 0.0001
2025-02-14 2024-12-31 13F SEER COM CL A 81578P106 583,603 372,199 1,348 0.0001
2025-05-14 2024-09-30 13F/A-2 SEER COM CL A 81578P106 211,404 -106,146 -33.43 416 -21.95 0.0000
2025-02-14 2024-09-30 13F/A-1 SEER COM CL A 81578P106 211,404 -106,146 416 0.0000
2024-11-14 2024-09-30 13F SEER COM CL A 81578P106 211,404 -106,146 416 0.0000
2025-05-14 2024-06-30 13F/A-2 SEER COM CL A 81578P106 317,550 -98,511 -23.68 533 -32.53 0.0000
2024-10-17 2024-06-30 13F/A-1 SEER COM CL A 81578P106 317,550 -98,511 533 0.0000
2024-08-14 2024-06-30 13F SEER COM CL A 81578P106 317,550 -98,511 533 0.0000
2024-10-17 2024-03-31 13F/A-2 SEER COM CL A 81578P106 416,061 -38,043 -8.38 791 -10.23 0.0001
2024-08-16 2024-03-31 13F/A-1 SEER COM CL A 81578P106 416,061 -38,043 791 0.0001
2024-05-15 2024-03-31 13F SEER COM CL A 81578P106 416,061 -38,043 791 0.0001
2024-08-16 2023-12-31 13F/A-1 SEER COM CL A 81578P106 454,104 246,137 118.35 881 91.72 0.0001
2024-02-13 2023-12-31 13F SEER COM CL A 81578P106 454,104 246,137 881 0.0001
2023-11-15 2023-09-30 13F SEER COM CL A 81578P106 207,967 -116,901 -35.98 460 -66.91 0.0000
2023-08-14 2023-06-30 13F SEER COM CL A 81578P106 324,868 86,383 36.22 1,387 50.76 0.0001
2023-05-15 2023-03-31 13F SEER COM CL A 81578P106 238,485 54,097 29.34 921 -13.94 0.0001
2023-02-14 2022-12-31 13F SEER COM CL A 81578P106 184,388 -645,954 -77.79 1,069 -83.37 0.0001
2022-11-14 2022-09-30 13F SEER COM CL A 81578P106 830,342 95,625 13.02 6,427 -2.27 0.0009
2022-10-27 2022-06-30 13F/A-1 SEER COM CL A 81578P106 734,717 -81,638 -10.00 6,576 -47.14 0.0009
2022-08-15 2022-06-30 13F SEER COM CL A 81578P106 734,717 -81,638 6,576 0.0009
2022-10-27 2022-03-31 13F/A-1 SEER COM CL A 81578P106 816,355 -526,211 -39.19 12,441 -59.37 0.0017
2022-05-13 2022-03-31 13F SEER COM CL A 81578P106 816,355 -526,211 12,441 0.0017
2022-02-14 2021-12-31 13F SEER COM CL A 81578P106 1,342,566 339,581 33.86 30,624 -11.57 0.0038
2021-11-15 2021-09-30 13F SEER COM CL A 81578P106 1,002,985 336,514 50.49 34,632 58.52 0.0047
2021-08-23 2021-06-30 13F/A-1 SEER COM CL A 81578P106 666,471 147,023 28.30 21,847 -15.92 0.0029
2021-08-16 2021-06-30 13F SEER COM CL A 81578P106 666,471 147,023 21,847 0.0006
2021-05-17 2021-03-31 13F SEER COM CL A 81578P106 519,448 -295,998 -36.30 25,983 -43.24 0.0038
2021-02-16 2020-12-31 13F SEER COM CL A 81578P106 815,446 815,446 45,780 0.0071
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.