Larimar Therapeutics, Inc.
US ˙ NasdaqGM ˙ US5171251003

SecurityLRMR / Larimar Therapeutics, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership420,813 shares
Latest Disclosed Value $ 1,893,660
Morgan Stanley reports 209.46% increase in ownership of LRMR / Larimar Therapeutics, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 420,813 shares of Larimar Therapeutics, Inc. (US:LRMR) valued at $1,893,658 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 135,983 shares of Larimar Therapeutics, Inc.. This represents a change in shares of 209.46% during the quarter. The current value of the position is $1,384,475 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)
2026-05-15 2026-03-31 13F LARIMAR THERAPEUTICS COM 517125100 420,813 284,830 209.46 1,894 265.44 0.0001
2026-05-27 2025-12-31 13F/A-1 LARIMAR THERAPEUTICS COM 517125100 135,983 42,980 46.21 518 72.67 0.0000
2026-02-13 2025-12-31 13F LARIMAR THERAPEUTICS COM 517125100 135,983 42,980 518 0.0000
2026-05-27 2025-09-30 13F/A-1 LARIMAR THERAPEUTICS COM 517125100 93,003 -76,035 -44.98 300 -38.52 0.0000
2025-11-14 2025-09-30 13F LARIMAR THERAPEUTICS COM 517125100 93,003 -76,035 300 0.0000
2025-08-15 2025-06-30 13F LARIMAR THERAPEUTICS COM 517125100 169,038 -242,342 -58.91 489 -44.80 0.0000
2025-05-15 2025-03-31 13F LARIMAR THERAPEUTICS COM 517125100 411,380 241,201 141.73 884 34.35 0.0001
2025-05-15 2024-12-31 13F/A-1 LARIMAR THERAPEUTICS COM 517125100 170,179 20,951 14.04 659 -32.65 0.0000
2025-02-14 2024-12-31 13F LARIMAR THERAPEUTICS COM 517125100 170,179 20,951 659 0.0000
2025-05-14 2024-09-30 13F/A-2 LARIMAR THERAPEUTICS COM 517125100 149,228 95,615 178.34 977 151.80 0.0001
2025-02-14 2024-09-30 13F/A-1 LARIMAR THERAPEUTICS COM 517125100 149,228 95,615 977 0.0001
2024-11-14 2024-09-30 13F LARIMAR THERAPEUTICS COM 517125100 149,228 95,615 977 0.0000
2025-05-14 2024-06-30 13F/A-2 LARIMAR THERAPEUTICS COM 517125100 53,613 6,324 13.37 389 8.38 0.0000
2024-10-17 2024-06-30 13F/A-1 LARIMAR THERAPEUTICS COM 517125100 53,613 6,324 389 0.0000
2024-08-14 2024-06-30 13F LARIMAR THERAPEUTICS COM 517125100 53,613 6,324 389 0.0000
2024-10-17 2024-03-31 13F/A-2 LARIMAR THERAPEUTICS COM 517125100 47,289 -8,925 -15.88 359 40.39 0.0000
2024-08-16 2024-03-31 13F/A-1 LARIMAR THERAPEUTICS COM 517125100 47,289 -8,925 359 0.0000
2024-05-15 2024-03-31 13F LARIMAR THERAPEUTICS COM 517125100 47,289 -8,925 359 0.0000
2024-08-16 2023-12-31 13F/A-1 LARIMAR THERAPEUTICS COM 517125100 56,214 31,880 131.01 256 165.63 0.0000
2024-02-13 2023-12-31 13F LARIMAR THERAPEUTICS COM 517125100 56,214 31,880 256 0.0000
2023-11-15 2023-09-30 13F LARIMAR THERAPEUTICS COM 517125100 24,334 -8,052 -24.86 96 -4.95 0.0000
2023-08-14 2023-06-30 13F LARIMAR THERAPEUTICS COM 517125100 32,386 -32,002 -49.70 101 -65.29 0.0000
2023-05-15 2023-03-31 13F LARIMAR THERAPEUTICS COM 517125100 64,388 -476,449 -88.09 292 -86.97 0.0000
2023-02-14 2022-12-31 13F LARIMAR THERAPEUTICS COM 517125100 540,837 10,544 1.99 2,234 31.59 0.0003
2022-11-14 2022-09-30 13F LARIMAR THERAPEUTICS COM 517125100 530,293 485 0.09 1,697 63.49 0.0002
2022-10-27 2022-06-30 13F/A-1 LARIMAR THERAPEUTICS COM 517125100 529,808 -176 -0.03 1,038 -51.63 0.0001
2022-08-15 2022-06-30 13F LARIMAR THERAPEUTICS COM 517125100 529,808 -176 1,038 0.0001
2022-10-27 2022-03-31 13F/A-1 LARIMAR THERAPEUTICS COM 517125100 529,984 518,189 4,393.29 2,146 1,589.76 0.0003
2022-05-13 2022-03-31 13F LARIMAR THERAPEUTICS COM 517125100 529,984 518,189 2,146 0.0003
2022-02-14 2021-12-31 13F LARIMAR THERAPEUTICS COM 517125100 11,795 -23,265 -66.36 127 -68.56 0.0000
2021-11-15 2021-09-30 13F LARIMAR THERAPEUTICS COM 517125100 35,060 472 1.36 404 19.17 0.0001
2021-08-23 2021-06-30 13F/A-1 LARIMAR THERAPEUTICS COM 517125100 34,588 8,471 32.43 339 -11.26 0.0000
2021-08-16 2021-06-30 13F LARIMAR THERAPEUTICS COM 517125100 34,588 8,471 339 0.0000
2021-05-17 2021-03-31 13F LARIMAR THERAPEUTICS COM 517125100 26,117 -6,938 -20.99 382 -46.05 0.0001
2021-02-16 2020-12-31 13F LARIMAR THERAPEUTICS COM 517125100 33,055 -20,745 -38.56 708 -13.24 0.0001
2020-11-13 2020-09-30 13F LARIMAR THERAPEUTICS COM 517125100 53,800 18,112 50.75 816 77.78 0.0002
2020-08-14 2020-06-30 13F LARIMAR THERAPEUTICS COM 517125100 35,688 -1,659,513 -97.89 459 -64.83 0.0001
2020-05-26 2020-03-31 13F/A-1 ZAFGEN COM 98885E103 1,695,201 -5,355 -0.31 1,305 -30.88 0.0004
2020-05-15 2020-03-31 13F ZAFGEN COM 98885E103 1,695,201 -5,355 1,305 100.2512
2020-02-14 2019-12-31 13F ZAFGEN COM 98885E103 1,700,556 -23,594 -1.37 1,888 48.19 0.0004
2019-11-14 2019-09-30 13F ZAFGEN COM 98885E103 1,724,150 1,539,544 833.96 1,274 479.09 0.0003
2019-08-14 2019-06-30 13F ZAFGEN COM 98885E103 184,606 110,989 150.77 220 8.91 0.0001
2019-05-15 2019-03-31 13F ZAFGEN COM 98885E103 73,617 -171,007 -69.91 202 -83.32 0.0001
2019-02-14 2018-12-31 13F ZAFGEN COM 98885E103 244,624 194,307 386.17 1,211 105.60 0.0004
2019-04-23 2018-09-30 13F/A-2 ZAFGEN COM 98885E103 50,317 659 1.33 589 15.94 0.0001
2018-11-20 2018-09-30 13F/A-1 ZAFGEN COM 98885E103 50,317 0 589 0.0001
2018-11-14 2018-09-30 13F ZAFGEN COM 98885E103 50,317 659 589
2019-04-23 2018-06-30 13F/A-1 ZAFGEN COM 98885E103 49,658 17,579 54.80 508 113.45 0.0001
2018-08-14 2018-06-30 13F ZAFGEN COM 98885E103 49,658 17,579 508
2019-04-23 2018-03-31 13F/A-1 ZAFGEN COM 98885E103 32,079 28,124 711.10 238 1,222.22 0.0001
2018-05-14 2018-03-31 13F ZAFGEN COM 98885E103 32,079 28,124 238
2019-04-23 2017-12-31 13F/A-1 ZAFGEN COM 98885E103 3,955 2,676 209.23 18 260.00 0.0000
2018-02-14 2017-12-31 13F ZAFGEN COM 98885E103 3,955 2,676 18
2017-11-14 2017-09-30 13F ZAFGEN COM 98885E103 1,279 -38,260 -96.77 5 -96.40 0.0000
2017-08-11 2017-06-30 13F ZAFGEN COM 98885E103 39,539 483 1.24 139 -23.63 0.0000
2017-05-22 2017-03-31 13F/A-1 ZAFGEN COM 98885E103 39,056 -63,715 -62.00 182 -44.34 0.0001
2017-05-12 2017-03-31 13F ZAFGEN COM 98885E103 39,056 182
2017-02-22 2016-12-31 13F/A-1 ZAFGEN COM 98885E103 102,771 70,302 216.52 327 205.61 0.0001
2017-02-13 2016-12-31 13F ZAFGEN COM 98885E103 102,771 327
2016-11-10 2016-09-30 13F ZAFGEN COM 98885E103 32,469 -79,254 -70.94 107 -84.03 0.0000
2016-08-12 2016-06-30 13F ZAFGEN COM 98885E103 111,723 35,773 47.10 670 32.15 0.0002
2016-05-12 2016-03-31 13F ZAFGEN COM 98885E103 75,950 -46,269 -37.86 507 -33.98 0.0002
2016-02-09 2015-12-31 13F ZAFGEN COM 98885E103 122,219 76,315 166.25 768 -47.65 0.0003
2016-02-08 2015-09-30 13F/A-1 ZAFGEN COM 98885E103 45,904 28,341 161.37 1,467 141.28 0.0005
2015-11-09 2015-09-30 13F ZAFGEN COM 98885E103 45,904 1,467
2015-08-12 2015-06-30 13F ZAFGEN COM 98885E103 17,563 10,288 141.42 608 111.11 0.0002
2015-05-14 2015-03-31 13F ZAFGEN COM 98885E103 7,275 6,092 514.96 288 678.38 0.0001
2015-02-13 2014-12-31 13F ZAFGEN COM 98885E103 1,183 -61,476 -98.11 37 -96.99 0.0000
2014-12-16 2014-09-30 13F/A-1 ZAFGEN COM 98885E103 62,659 62,659 1,231 0.0005
2014-11-14 2014-09-30 13F ZAFGEN COM 98885E103 62,659 1,231 0.0005
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.