SEC ownership of MERRIMACK PHARMACEUTICALS INC
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001274792.
- CIK
- 0001274792
- Location
- Cambridge, MA
- Parsed ownership evidence
- 3/4/5
- Lead holder
- Noah G. Levy
- Latest evidence date
- 26 Dec 2023
Ownership snapshot
Top shareholders of MERRIMACK PHARMACEUTICALS INC (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Noah G. Levy |
3/4/5
Director, Other*
|
—
class O/S missing
|
$14,946,809
1,119,586 shares
|
— | 12 Jan 2023 |
| Eric D. Andersen |
3/4/5
Director, Other*
|
—
class O/S missing
|
$7,129,167
534,008 shares
|
— | 26 Dec 2023 |
| Gary L. Crocker |
3/4/5
Chairman, President, and Treasurer, Director
|
—
class O/S missing
|
$1,776,992
133,105 shares
|
— | 10 Aug 2023 |
| Ulrik B. Nielsen |
3/4/5
Director
|
—
class O/S missing
|
—
28,000 shares
|
— | 06 Jun 2023 |
| Ana Radeljevic |
3/4/5
Director
|
—
class O/S missing
|
—
14,000 shares
|
— | 06 Jun 2023 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 29 May 2025.
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Current reporting-owner rows connected to MERRIMACK PHARMACEUTICALS INC. Open the relationship link for the CIK-to-CIK filing trail.
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Noah G. Levy | Director, Other* | $14,946,809 | Mixed | 12 Jan 2023 | ||
| Eric D. Andersen | Director, Other* | $7,129,167 | Filing P/S | 26 Dec 2023 | ||
| Gary L. Crocker | Chairman, President, and Treasurer, Director | $1,776,992 | Mixed | 10 Aug 2023 | ||
| Russell T. Ray | Director | Mixed | 31 Dec 2021 | |||
| Ulrik B. Nielsen | Director | Mixed | 06 Jun 2023 | |||
| Ana Radeljevic | Director | Mixed | 06 Jun 2023 |
Recent Insider Transactions by Companies or Individuals for MERRIMACK PHARMACEUTICALS INC
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Reported value | Reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| No insider transactions were found in the last 12 months for this issuer. | ||||||||||