Onterris, Inc.
DE ˙ MUN ˙ US6151111019
14,80 € ↑0,40 (2,78%)
2026-06-05
DEL PRIS
SecurityDE:5MO / Onterris, Inc.
InstitutionBamco Inc /ny/
Latest Disclosed Ownership2,160,463 shares
Ownership 6.12%
Bamco Inc /ny/ ownership in 5MO / Onterris, Inc.

2025-11-14 - Bamco Inc /ny/ has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 2,160,463 shares of Onterris, Inc. (DE:5MO). This represents 6.12 percent ownership of the company. In their previous filing dated 2025-05-15 , Bamco Inc /ny/ had reported owning 2,695,682 shares, indicating a decrease of -19.85 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date
Effective
Date
Form Prev
Shares
Latest
Shares
ΔShares
(Percent)
Ownership
(Percent)
ΔOwnership
(Percent)
2025-11-14 2025-11-14 13G/A 2,695,682 2,160,463 -19.85 6.12 -21.34
2025-05-15 2025-05-15 13G/A 2,292,630 2,695,682 17.58 7.78 16.47
2025-02-14 2025-02-14 13G 2,292,630 6.68

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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 MONTROSE ENVIRONMENTAL GROUP COM 615111101 2,168,183 7,584 0.35 47,462 -11.53 0.1433
2026-02-17 2025-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 2,160,599 136 0.01 53,648 -9.57 0.1453
2025-11-14 2025-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 2,160,463 -603,932 -21.85 59,326 -1.96 0.1573
2025-08-14 2025-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 2,764,395 68,713 2.55 60,513 57.42 0.1640
2025-05-15 2025-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 2,695,682 403,052 17.58 38,440 -9.61 0.1129
2025-02-14 2024-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 2,292,630 1,050,000 84.50 42,528 30.13 0.1099
2024-11-14 2024-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 1,242,630 86,000 7.44 32,681 -36.59 0.0867
2024-08-14 2024-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 1,156,630 2,600 0.23 51,539 14.02 0.1476
2024-05-15 2024-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 1,154,030 102,536 9.75 45,203 33.80 0.1205
2024-02-14 2023-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 1,051,494 41,657 4.13 33,785 14.34 0.0900
2023-11-14 2023-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 1,009,837 0 0.00 29,548 -30.53 0.0859
2023-08-14 2023-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 1,009,837 53,650 5.61 42,534 24.71 0.1178
2023-05-15 2023-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 956,187 249,850 35.37 34,107 8.78 0.1024
2023-02-14 2022-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 706,337 -54,800 -7.20 31,354 22.42 0.1053
2022-11-14 2022-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 761,137 0 0.00 25,612 -0.33 0.0827
2022-08-15 2022-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 761,137 109,600 16.82 25,696 -25.49 0.0825
2022-05-13 2022-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 651,537 0 0.00 34,486 -24.93 0.0846
2022-02-14 2021-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 651,537 0 0.00 45,940 14.20 0.0974
2021-11-12 2021-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 651,537 51,895 8.65 40,226 25.01 0.0911
2021-08-13 2021-06-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 599,642 23,919 4.15 32,177 11.35 0.0737
2021-05-19 2021-03-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 575,723 25,723 4.68 28,896 69.70 0.0712
2021-02-12 2020-12-31 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 550,000 0 0.00 17,028 29.97 0.0421
2020-11-13 2020-09-30 13F MONTROSE ENVIRONMENTAL GROUP COM 615111101 550,000 550,000 13,101 0.0402
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.