Larimar Therapeutics, Inc.
US ˙ NasdaqGM ˙ US5171251003

SecurityLRMR / Larimar Therapeutics, Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership376,503 shares
Latest Disclosed Value $ 1,694,264
Northern Trust Corp reports 5.53% increase in ownership of LRMR / Larimar Therapeutics, Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 376,503 shares of Larimar Therapeutics, Inc. (US:LRMR) valued at $1,694,264 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 356,775 shares of Larimar Therapeutics, Inc.. This represents a change in shares of 5.53% during the quarter. The current value of the position is $1,238,695 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)
2026-05-14 2026-03-31 13F LARIMAR THERAPEUTICS COM 517125100 376,503 19,728 5.53 1,694 24.65 0.0000
2026-02-17 2025-12-31 13F LARIMAR THERAPEUTICS COM 517125100 356,775 -21,532 -5.69 1,359 11.30 0.0000
2025-11-14 2025-09-30 13F LARIMAR THERAPEUTICS COM 517125100 378,307 34,326 9.98 1,222 22.84 0.0000
2025-08-13 2025-06-30 13F LARIMAR THERAPEUTICS COM 517125100 343,981 -21,687 -5.93 994 26.46 0.0001
2025-05-13 2025-03-31 13F LARIMAR THERAPEUTICS COM 517125100 365,668 -10,790 -2.87 786 -46.02 0.0001
2025-02-14 2024-12-31 13F LARIMAR THERAPEUTICS COM 517125100 376,458 29,924 8.64 1,457 -35.83 0.0002
2024-11-13 2024-09-30 13F LARIMAR THERAPEUTICS COM 517125100 346,534 47,643 15.94 2,270 4.76 0.0004
2024-08-14 2024-06-30 13F LARIMAR THERAPEUTICS COM 517125100 298,891 3,469 1.17 2,167 -3.39 0.0004
2024-05-14 2024-03-31 13F LARIMAR THERAPEUTICS COM 517125100 295,422 27,130 10.11 2,242 83.77 0.0004
2024-02-13 2023-12-31 13F LARIMAR THERAPEUTICS COM 517125100 268,292 31,535 13.32 1,221 30.48 0.0002
2023-11-13 2023-09-30 13F LARIMAR THERAPEUTICS COM 517125100 236,757 27,655 13.23 935 42.97 0.0002
2023-08-11 2023-06-30 13F LARIMAR THERAPEUTICS COM 517125100 209,102 158,573 313.83 654 186.84 0.0001
2023-05-15 2023-03-31 13F LARIMAR THERAPEUTICS COM 517125100 50,529 269 0.54 229 10.14 0.0000
2023-02-13 2022-12-31 13F LARIMAR THERAPEUTICS COM 517125100 50,260 28,930 135.63 208 204.41 0.0000
2022-11-14 2022-09-30 13F LARIMAR THERAPEUTICS COM 517125100 21,330 0 0.00 68 61.90 0.0000
2022-08-12 2022-06-30 13F LARIMAR THERAPEUTICS COM 517125100 21,330 0 0.00 42 -51.16 0.0000
2022-05-13 2022-03-31 13F LARIMAR THERAPEUTICS COM 517125100 21,330 0 0.00 86 -62.61 0.0000
2022-02-08 2021-12-31 13F LARIMAR THERAPEUTICS COM 517125100 21,330 -2,168 -9.23 230 -15.13 0.0000
2021-11-15 2021-09-30 13F LARIMAR THERAPEUTICS COM 517125100 23,498 -860 -3.53 271 13.39 0.0000
2021-08-13 2021-06-30 13F LARIMAR THERAPEUTICS COM 517125100 24,358 0 0.00 239 -32.87 0.0000
2021-05-12 2021-03-31 13F LARIMAR THERAPEUTICS COM 517125100 24,358 -179 -0.73 356 -32.19 0.0001
2021-02-11 2020-12-31 13F LARIMAR THERAPEUTICS COM 517125100 24,537 5,873 31.47 525 85.51 0.0001
2020-11-16 2020-09-30 13F LARIMAR THERAPEUTICS COM 517125100 18,664 18,664 283 0.0001
2020-08-14 2020-06-30 13F ZAFGEN COM 98885E103 0 -78,651 -100.00 0 -100.00
2020-05-14 2020-03-31 13F ZAFGEN COM 98885E103 78,651 100 0.13 61 -29.89 0.0000
2020-02-14 2019-12-31 13F ZAFGEN COM 98885E103 78,551 -75 -0.10 87 50.00 0.0000
2019-11-13 2019-09-30 13F ZAFGEN COM 98885E103 78,626 -264,244 -77.07 58 -85.78 0.0000
2019-08-13 2019-06-30 13F ZAFGEN COM 98885E103 342,870 -16,238 -4.52 408 -58.54 0.0001
2019-05-13 2019-03-31 13F ZAFGEN COM 98885E103 359,108 -18,185 -4.82 984 -47.32 0.0002
2019-02-12 2018-12-31 13F ZAFGEN COM 98885E103 377,293 1,224 0.33 1,868 -57.51 0.0005
2018-11-14 2018-09-30 13F ZAFGEN COM 98885E103 376,069 111,771 42.29 4,396 62.63 0.0011
2018-09-18 2018-06-30 13F/A-1 ZAFGEN COM 98885E103 264,298 203,041 331.46 2,703 492.76 0.0007
2018-08-14 2018-06-30 13F ZAFGEN COM 98885E103 264,298 203,041 2,703
2018-05-09 2018-03-31 13F ZAFGEN COM 98885E103 61,257 12,348 25.25 456 101.77 0.0001
2018-02-14 2017-12-31 13F ZAFGEN COM 98885E103 48,909 2,022 4.31 226 36.97 0.0001
2017-11-13 2017-09-30 13F ZAFGEN COM 98885E103 46,887 -200 -0.42 165 0.00 0.0000
2017-08-11 2017-06-30 13F ZAFGEN COM 98885E103 47,087 -180,664 -79.33 165 -84.46 0.0000
2017-05-12 2017-03-31 13F ZAFGEN COM 98885E103 227,751 -634 -0.28 1,062 46.28 0.0003
2017-02-13 2016-12-31 13F ZAFGEN COM 98885E103 228,385 -147,332 -39.21 726 -41.59 0.0002
2016-11-09 2016-09-30 13F ZAFGEN COM 98885E103 375,717 217,443 137.38 1,243 31.12 0.0004
2016-08-12 2016-06-30 13F ZAFGEN COM 98885E103 158,274 -28,082 -15.07 948 -23.92 0.0003
2016-08-19 2016-03-31 13F/A-1 ZAFGEN COM 98885E103 186,356 -6,628 -3.43 1,246 2.64 0.0004
2016-05-13 2016-03-31 13F ZAFGEN COM 98885E103 186,356 1,246
2016-02-12 2015-12-31 13F ZAFGEN COM 98885E103 192,984 -21,428 -9.99 1,214 -82.28 0.0004
2015-11-12 2015-09-30 13F Zafgen COMM 98885E103 214,412 214,412 0.00 6,851 0.0023
2015-08-13 2015-06-30 13F Zafgen COMM 98885E103 0 -96,389 -100.00 0 -100.00
2015-05-14 2015-03-31 13F Zafgen COMM 98885E103 96,389 24,565 34.20 3,818 72.37 0.0011
2015-02-12 2014-12-31 13F Zafgen COM 98885E103 71,824 51,143 247.29 2,215 444.23 0.0007
2014-11-13 2014-09-30 13F ZAFGEN COM 98885E103 20,681 20,681 407 0.0001
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.