SEC Form 4
Larimar Therapeutics, Inc. (LRMR) insider trading
In the 12 months to Nov 14, 2026, 9 LRMR insiders reported open-market purchases of $26.1M across 12 filings; no open-market sales were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $0
- 0 filings · 0 insiders
- Open-market purchases
- $26.1M
- 12 filings
Who traded LRMR, and when
- Purchase
LRMR daily close from Nov 14, 2025 to Nov 13, 2026, between $1.99 and $5.95, last $3.02. 0 sale and 12 purchase filings by 9 insiders, marked at their filing dates. James E. Flynn, Director: bought $25.0M across 1 filing, first filed Mar 2, 2026, last Mar 2, 2026. Thomas Edward Hamilton, Director: bought $854.0K across 3 filings, first filed Mar 2, 2026, last Nov 12, 2026. Michael Celano, Chief Financial Officer: bought $50.0K across 1 filing, first filed Nov 12, 2026, last Nov 12, 2026. Carole Ben-Maimon, President and CEO: bought $50.0K across 1 filing, first filed Nov 12, 2026, last Nov 12, 2026. John B. Harlow JR., President and COO: bought $49.9K across 1 filing, first filed Nov 12, 2026, last Nov 12, 2026. Frank E. Thomas, Director: bought $46.8K across 2 filings, first filed Mar 2, 2026, last Nov 12, 2026. Jeffrey W. Sherman, Director: bought $25.0K across 1 filing, first filed Mar 2, 2026, last Mar 2, 2026. Gopi Shankar, Chief Development Officer: bought $13.5K across 1 filing, first filed Nov 12, 2026, last Nov 12, 2026. Joseph Truitt, Director: bought $9.8K across 1 filing, first filed Nov 12, 2026, last Nov 12, 2026.
Largest mark · tap a row for others
James E. Flynn · Director
Purchase $25,000,000
5,000,000 shares at $5.00 avg
Filed Mar 2, 2026 · traded Feb 27
Close on filing date $5.23
James E. Flynn · Director
Director
$25.0M boughtThomas Edward Hamilton · Director
Director
$854.0K boughtMichael Celano · Chief Financial Officer
Chief Financial Officer
$50.0K boughtCarole Ben-Maimon · President and CEO
President and CEO
$50.0K boughtJohn B. Harlow JR. · President and COO
President and COO
$49.9K boughtFrank E. Thomas · Director
Director
$46.8K boughtJeffrey W. Sherman · Director
Director
$25.0K boughtGopi Shankar · Chief Development Officer
Chief Development Officer
$13.5K boughtJoseph Truitt · Director
Director
$9.8K boughtOpen-market trades
12 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| James E. Flynn | Director | — | $25.0M | 1 | — | |
| Thomas Edward Hamilton | Director | — | $854.0K | 3 | — | |
| Michael Celano | Chief Financial Officer | — | $50.0K | 1 | — | |
| Carole Ben-Maimon | President and CEO | — | $50.0K | 1 | — | |
| John B. Harlow JR. | President and COO | — | $49.9K | 1 | — | |
| Frank E. Thomas | Director | — | $46.8K | 2 | — | |
| Jeffrey W. Sherman | Director | — | $25.0K | 1 | — | |
| Gopi Shankar | Chief Development Officer | — | $13.5K | 1 | — | |
| Joseph Truitt | Director | — | $9.8K | 1 | — |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | Gopi Shankar Chief Development Officer | Purchase | 5,000 | $2.71 | $13.5K | 81,443 | |
traded | Michael Celano Chief Financial Officer | Purchase | 18,460 | $2.71 | $50.0K | 234,245 | |
traded | John B. Harlow JR. President and COO | Purchase | 17,800 | $2.80 | $49.9K | 67,800 | |
traded | Joseph Truitt Director | Purchase | 3,500 | $2.80 | $9.8K | 6,250 | |
traded | Frank E. Thomas Director | Purchase | 8,000 | $2.73 | $21.8K | 15,000 | |
traded | Carole Ben-Maimon President and CEO | Purchase | 18,050 | $2.77 | $50.0K | 386,326 | |
traded | Thomas Edward Hamilton Director | Purchase | 70,000 | $2.67 | $187.1K | 70,000 | |
traded | Thomas Edward Hamilton Director | Purchase | 50,000 | $3.34 | $166.9K | 714,798 | |
traded | Jeffrey W. Sherman Director | Purchase | 5,000 | $5.00 | $25.0K | 5,000 | |
traded | Frank E. Thomas Director | Purchase | 5,000 | $5.00 | $25.0K | 7,000 | |
traded | Thomas Edward Hamilton Director | Purchase | 100,000 | $5.00 | $500.0K | 664,798 | |
traded | James E. Flynn Director | Purchase | 5,000,000 | $5.00 | $25.0M | Multiple accounts |
GET /stocks/filings/vX/form-4?tickers=LRMR&filing_date.gte=2025-11-14&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"LRMR"
],
"issuer_cik": "0001374690",
"owner_cik": "0001769848",
"accession_number": "0001193125-26-459008",
"form_type": "4",
"filing_date": "2026-11-12",
"period_of_report": "2026-11-12",
"issuer_name": "Larimar Therapeutics, Inc.",
"issuer_trading_symbol": "LRMR",
"owner_name": "Hamilton Thomas Edward",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-11-12",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 70000,
"transaction_price_per_share": 2.6726,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 70000,
"transaction_value": 187082,
"direct_or_indirect": "I",
"nature_of_ownership": "Cure FA Foundation, Inc.",
"footnotes": [
{
"id": "F1",
"description": "The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.60 to $2.74, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein."
}
]
},
{
"tickers": [
"LRMR"
],
"issuer_cik": "0001374690",
"owner_cik": "0001377582",
"accession_number": "0001193125-26-458834",
"form_type": "4",
"filing_date": "2026-11-12",
"period_of_report": "2026-11-11",
"issuer_name": "Larimar Therapeutics, Inc.",
"issuer_trading_symbol": "LRMR",
"owner_name": "Celano Michael",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "Chief Financial Officer",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": false,
"transaction_date": "2026-11-11",
"transaction_code": "P",
"equity_swap_involved": false,
"transaction_shares": 18460,
"transaction_price_per_share": 2.7081,
"transaction_acquired_disposed": "A",
"shares_owned_following_transaction": 234245,
"transaction_value": 49991.526,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.695 to $2.715, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 5 records
- Grants and awards5 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
- Counted once
- When several owners (a fund and its partners, say) report the same trade, it's counted once. Corrected filings replace the originals.
Frequently asked questions
Has Larimar Therapeutics, Inc.'s CEO sold stock?
No. Carole Ben-Maimon (CEO) made no open-market sales filed as CEO in the last 12 months.
How current is LRMR’s insider data?
These are LRMR Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
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Track LRMR insider trades with your agent
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for LRMR every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
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