Onterris, Inc.
DE ˙ MUN ˙ US6151111019
14,10 € ↑0,70 (5,22%)
2026-06-03
DEL PRIS
SecurityDE:5MO / Onterris, Inc.
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership867,042 shares
Latest Disclosed Value $ 18,979,041
Janus Henderson Group Plc reports 13.50% increase in ownership of 5MO / Onterris, Inc.

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 867,042 shares of Onterris, Inc. (DE:5MO) valued at $16,300,390 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 763,892 shares of Onterris, Inc.. This represents a change in shares of 13.50% during the quarter. The current value of the position is $12,225,292 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)
2026-05-18 2026-03-31 13F/A-1 MONTROSE ENVIRONMENTAL GROUP COM 615111101 867,042 103,150 13.50 18,979 0.06 0.0032
2026-05-15 2026-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 867,042 103,150 13.50 18,979 0.06 0.0035
2026-02-17 2025-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 763,892 -31,840 -4.00 18,967 -13.19 0.0085
2025-11-14 2025-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 795,732 -18,016 -2.21 21,851 22.66 0.0100
2025-08-14 2025-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 813,748 133,061 19.55 17,813 81.62 0.0087
2025-05-15 2025-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 680,687 -380 -0.06 9,809 -22.36 0.0054
2025-02-14 2024-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 681,067 196,262 40.48 12,634 -0.92 0.0064
2024-11-14 2024-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 484,805 -275 -0.06 12,750 -41.02 0.0065
2024-08-14 2024-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 485,080 -2,086 -0.43 21,616 13.28 0.0116
2024-05-15 2024-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 487,166 2,596 0.54 19,082 22.56 0.0104
2024-02-14 2023-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 484,570 124,228 34.48 15,570 47.67 0.0093
2023-11-14 2023-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 360,342 -1,027 -0.28 10,543 -30.73 0.0069
2023-08-14 2023-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 361,369 -22 -0.01 15,220 18.08 0.0095
2023-05-15 2023-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 361,391 3,965 1.11 12,890 -18.75 0.0085
2023-02-14 2022-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 357,426 0 0.00 15,866 31.91 0.0113
2023-01-13 2022-09-30 13F/A-1 MONTROSE ENVIRONMENTAL GROUP COM 615111101 357,426 -14 -0.00 12,027 -0.33 0.0090
2022-11-14 2022-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 357,426 -14 12,027 0.0031
2022-08-15 2022-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 357,440 85,130 31.26 12,067 -16.28 0.0083
2022-05-16 2022-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 272,310 -1,501 -0.55 14,413 -25.35 0.0070
2022-02-14 2021-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 273,811 -93,355 -25.43 19,307 -14.83 0.0081
2021-11-16 2021-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 367,166 -51,802 -12.36 22,669 0.83 0.0099
2021-08-16 2021-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 418,968 -16,953 -3.89 22,482 2.76 0.0096
2021-05-17 2021-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 435,921 -267,490 -38.03 21,879 0.46 0.0100
2021-02-16 2020-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 703,411 2,765 0.39 21,778 30.49 0.0101
2020-11-16 2020-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 700,646 700,646 16,689 0.0087
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.