Fractyl Health, Inc.

SecurityGUTS / Fractyl Health, Inc.
InstitutionCitadel Advisors Llc
ManagerKen Griffin
Latest Disclosed Ownership48,196 shares
Latest Disclosed Value $ 22,064
Citadel Advisors Llc reports 78.95% decrease in ownership of GUTS / Fractyl Health, Inc.

On May 15, 2026 - Citadel Advisors Llc filed a 13F-HR form disclosing ownership of 48,196 shares of Fractyl Health, Inc. (US:GUTS) valued at $22,064 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 228,985 shares of Fractyl Health, Inc.. This represents a change in shares of -78.95% during the quarter. The current value of the position is $32,706 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 FRACTYL HEALTH COM 35168W103 48,196 -180,789 -78.95 22 -95.63 0.0000
2026-02-17 2025-12-31 13F FRACTYL HEALTH COM 35168W103 228,985 -1,553,371 -87.15 504 -82.24 0.0001
2025-11-14 2025-09-30 13F FRACTYL HEALTH COM 35168W103 1,782,356 1,782,356 2,834 0.0004
2025-08-14 2025-06-30 13F FRACTYL HEALTH COM 35168W103 0 -100,345 -100.00 0 -100.00
2025-05-15 2025-03-31 13F FRACTYL HEALTH COM 35168W103 100,345 -631,664 -86.29 119 -92.10 0.0000
2025-02-14 2024-12-31 13F FRACTYL HEALTH COM 35168W103 732,009 -90,821 -11.04 1,508 -27.58 0.0003
2024-11-14 2024-09-30 13F FRACTYL HEALTH COM 35168W103 822,830 32,573 4.12 2,082 -38.32 0.0004
2024-08-14 2024-06-30 13F FRACTYL HEALTH COM 35168W103 790,257 -913,579 -53.62 3,374 -73.24 0.0007
2024-05-15 2024-03-31 13F FRACTYL HEALTH COM 35168W103 1,703,836 1,703,836 12,608 0.0024
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.