Onterris, Inc.
DE ˙ MUN ˙ US6151111019
14,80 € ↑0,40 (2,78%)
2026-06-05
DEL PRIS
SecurityDE:5MO / Onterris, Inc.
InstitutionBlair William & Co/il
Latest Disclosed Ownership266,980 shares
Latest Disclosed Value $ 5,844,181
Blair William & Co/il reports 21.68% decrease in ownership of 5MO / Onterris, Inc.

On May 8, 2026 - Blair William & Co/il filed a 13F-HR form disclosing ownership of 266,980 shares of Onterris, Inc. (DE:5MO) valued at $5,019,224 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 340,869 shares of Onterris, Inc.. This represents a change in shares of -21.68% during the quarter. The current value of the position is $3,951,304 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)
2026-05-08 2026-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 266,980 -73,889 -21.68 5,844 -30.95 0.0167
2026-02-17 2025-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 340,869 11,893 3.62 8,464 -6.31 0.0227
2025-11-12 2025-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 328,976 -21,155 -6.04 9,034 17.86 0.0240
2025-07-24 2025-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 350,131 15,910 4.76 7,664 60.84 0.0213
2025-05-09 2025-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 334,221 -312,391 -48.31 4,766 -60.27 0.0144
2025-02-12 2024-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 646,612 -104,076 -13.86 11,995 -39.25 0.0349
2024-11-12 2024-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 750,688 -18,965 -2.46 19,743 -42.43 0.0580
2024-08-12 2024-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 769,653 37,335 5.10 34,296 19.56 0.1058
2024-05-09 2024-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 732,318 170,924 30.45 28,685 59.03 0.0901
2024-02-12 2023-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 561,394 -241,172 -30.05 18,038 -23.19 0.0615
2023-11-09 2023-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 802,566 -227,563 -22.09 23,483 -45.88 0.0901
2023-08-11 2023-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 1,030,129 27,392 2.73 43,389 21.31 0.1589
2023-05-12 2023-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 1,002,737 203,696 25.49 35,768 0.84 0.1429
2023-02-10 2022-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 799,041 46,433 6.17 35,469 40.06 0.1542
2022-11-09 2022-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 752,608 67,471 9.85 25,325 9.49 0.1163
2022-08-10 2022-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 685,137 -58,881 -7.91 23,130 -41.27 0.1026
2022-05-13 2022-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 744,018 195,650 35.68 39,381 1.85 0.1380
2022-02-14 2021-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 548,368 247,176 82.07 38,665 107.92 0.1213
2021-11-12 2021-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 301,192 27,905 10.21 18,596 26.81 0.0633
2021-08-12 2021-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 273,287 75,774 38.36 14,665 47.94 0.0508
2021-05-13 2021-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 197,513 23,440 13.47 9,913 83.95 0.0374
2021-02-09 2020-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 174,073 174,073 5,389 0.0198
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.