Larimar Therapeutics, Inc.
US ˙ NasdaqGM ˙ US5171251003

SecurityLRMR / Larimar Therapeutics, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership798,462 shares
Latest Disclosed Value $ 3,591,819
Dimensional Fund Advisors Lp reports 143.81% increase in ownership of LRMR / Larimar Therapeutics, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 798,462 shares of Larimar Therapeutics, Inc. (US:LRMR) valued at $3,593,079 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 327,494 shares of Larimar Therapeutics, Inc.. This represents a change in shares of 143.81% during the quarter. The current value of the position is $2,531,125 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.

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)
2026-05-07 2026-03-31 13F LARIMAR THERAPEUTICS COM 517125100 798,462 470,968 143.81 3,592 187.97 0.0002
2026-02-12 2025-12-31 13F LARIMAR THERAPEUTICS COM 517125100 327,494 271,237 482.14 1,248 588.95 0.0003
2025-11-12 2025-09-30 13F LARIMAR THERAPEUTICS COM 517125100 56,257 24,903 79.43 182 101.11 0.0000
2025-08-12 2025-06-30 13F LARIMAR THERAPEUTICS COM 517125100 31,354 -41,295 -56.84 91 -42.31 0.0000
2025-05-13 2025-03-31 13F LARIMAR THERAPEUTICS COM 517125100 72,649 -8,501 -10.48 156 -50.32 0.0000
2025-02-13 2024-12-31 13F LARIMAR THERAPEUTICS COM 517125100 81,150 -25,753 -24.09 314 -55.14 0.0001
2024-11-07 2024-09-30 13F LARIMAR THERAPEUTICS COM 517125100 106,903 -38,820 -26.64 700 -33.77 0.0002
2024-08-09 2024-06-30 13F LARIMAR THERAPEUTICS COM 517125100 145,723 -30,021 -17.08 1,057 -20.71 0.0003
2024-05-10 2024-03-31 13F LARIMAR THERAPEUTICS COM 517125100 175,744 -19,444 -9.96 1,334 50.11 0.0004
2024-02-07 2023-12-31 13F LARIMAR THERAPEUTICS COM 517125100 195,188 -29,038 -12.95 888 0.11 0.0003
2023-11-09 2023-09-30 13F LARIMAR THERAPEUTICS COM 517125100 224,226 -94,683 -29.69 888 -11.12 0.0003
2023-08-09 2023-06-30 13F LARIMAR THERAPEUTICS COM 517125100 318,909 153,467 92.76 998 33.24 0.0003
2023-05-12 2023-03-31 13F LARIMAR THERAPEUTICS COM 517125100 165,442 101,275 157.83 749 0.0003
2023-02-09 2022-12-31 13F LARIMAR THERAPEUTICS COM 517125100 64,167 34,955 119.66 0 -100.00 0.0001
2022-11-10 2022-09-30 13F LARIMAR THERAPEUTICS COM 517125100 29,212 4,474 18.09 93 93.75 0.0000
2022-08-12 2022-06-30 13F LARIMAR THERAPEUTICS COM 517125100 24,738 -3,400 -12.08 48 -57.89 0.0000
2022-05-13 2022-03-31 13F LARIMAR THERAPEUTICS COM 517125100 28,138 0 0.00 114 -62.50 0.0000
2022-02-09 2021-12-31 13F LARIMAR THERAPEUTICS COM 517125100 28,138 12,731 82.63 304 70.79 0.0001
2021-11-12 2021-09-30 13F LARIMAR THERAPEUTICS COM 517125100 15,407 15,407 178 0.0001
2021-08-12 2021-06-30 13F LARIMAR THERAPEUTICS COM 517125100 0 -13,842 -100.00 0 -100.00
2021-05-14 2021-03-31 13F LARIMAR THERAPEUTICS COM 517125100 13,842 13,842 202 0.0001
2020-02-14 2019-12-31 13F ZAFGEN COM 98885E103 0 -663,211 -100.00 0 -100.00
2019-11-12 2019-09-30 13F ZAFGEN COM 98885E103 663,211 -405,159 -37.92 490 -61.45 0.0002
2019-08-13 2019-06-30 13F ZAFGEN COM 98885E103 1,068,370 13,761 1.30 1,271 -56.01 0.0005
2019-08-12 2019-03-31 13F/A-2 ZAFGEN COM 98885E103 1,054,609 150,415 16.64 2,889 -35.46 0.0012
2019-05-10 2019-03-31 13F ZAFGEN COM 98885E103 1,054,609 150,415 2,889
2019-02-26 2018-12-31 13F/A-1 ZAFGEN COM 98885E103 904,194 21,423 2.43 4,476 -56.63 0.0020
2019-02-13 2018-12-31 13F ZAFGEN COM 98885E103 904,194 21,423 4,476
2018-11-13 2018-09-30 13F ZAFGEN COM 98885E103 882,771 -31,923 -3.49 10,320 10.29 0.0039
2018-08-10 2018-06-30 13F ZAFGEN COM 98885E103 914,694 49,722 5.75 9,357 45.20 0.0037
2018-05-11 2018-03-31 13F ZAFGEN COM 98885E103 864,972 174,482 25.27 6,444 102.01 0.0027
2018-02-12 2017-12-31 13F ZAFGEN COM 98885E103 690,490 103,907 17.71 3,190 54.48 0.0013
2017-11-13 2017-09-30 13F ZAFGEN COM 98885E103 586,583 2,424 0.41 2,065 0.73 0.0009
2017-08-11 2017-06-30 13F ZAFGEN COM 98885E103 584,159 140,848 31.77 2,050 -0.77 0.0009
2017-05-12 2017-03-31 13F ZAFGEN COM 98885E103 443,311 136,849 44.65 2,066 111.90 0.0010
2017-02-09 2016-12-31 13F ZAFGEN COM 98885E103 306,462 89,805 41.45 975 35.98 0.0005
2016-11-10 2016-09-30 13F ZAFGEN COM 98885E103 216,657 196,866 994.72 717 502.52 0.0004
2016-08-09 2016-06-30 13F ZAFGEN COM 98885E103 19,791 -45,681 -69.77 119 -72.77 0.0001
2016-05-13 2016-03-31 13F ZAFGEN COM 98885E103 65,472 -13 -0.02 437 6.07 0.0003
2016-02-10 2015-12-31 13F ZAFGEN COM 98885E103 65,485 65,485 412 0.0003
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.