Skip to main content

Merrimack Pharmaceuticals Inc

MACKInactive ticker
Industry
Pharmaceutical Preparations
SEC CIK
0001274792

No open-market purchases or sales by Merrimack Pharmaceuticals Inc insiders were filed in the last 90 days; 1 institution reported holding it in 13F filings for Q2 2026, worth $0 in total; no superinvestor holds it.

This ticker is no longer on the SEC's list of tickers: the company may have been delisted, or the ticker has changed.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Merrimack Pharmaceuticals Inc insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
0 filings
Insiders trading
0
Net value
$0
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Merrimack Pharmaceuticals Inc, current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Merrimack Pharmaceuticals Inc
NameTitleLast reported holdingLast filingFilings, past year
Western Standard Partners LPOther: See Remarks534,008IndirectDec 28, 20230
Western Standard LLCOther: See Remarks534,008IndirectDec 28, 20230
Andersen EricDirector, Other: See remarks534,008IndirectDec 28, 20230
Western Standard Partners QP, L.P.Other: See Remarks534,008IndirectDec 28, 20230
Crocker Gary LSee Remarks133,105IndirectAug 14, 20230
Nielsen Ulrik B.Director36,968IndirectJun 8, 20230
Radeljevic AnaDirector4,156Jun 8, 20230
Newtyn Partners, LPOther: See Remarks1,119,586IndirectJan 17, 20230
Newtyn TE Partners, LPOther: See Remarks1,119,586IndirectJan 17, 20230
Newtyn Management, LLCOther: See Remarks1,119,586IndirectJan 17, 20230
Levy Noah G.Director, Other: See remarks1,119,586IndirectJan 17, 20230
Newtyn Capital Partners, LPOther: See Remarks1,119,586IndirectJan 17, 20230
Ledo Capital, LLCOther: See Remarks1,119,586IndirectJan 17, 20230
Ray Russell TDirector0Jan 4, 20220

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Dec 28, 2023 (view filing)4:05 PM ETDec 26-282 daysAndersen Eric and 3 othersDirector, Other: See remarksPPurchase+49.5K$13.15+$651.8K+10.2%534.0K after2 lots
Dec 11, 2023 (view filing)4:05 PM ETDec 74 daysAndersen Eric and 3 othersDirector, Other: See remarksPPurchase+101.0K$12.85+$1.30M+26.4%484.5K after2 lots
Nov 20, 2023 (view filing)6:59 PM ETNov 173 daysAndersen Eric and 3 othersDirector, Other: See remarksPPurchase+300$12.50+$3.75K+0.1%459.8K after2 lots
Nov 16, 2023 (view filing)5:09 PM ETNov 142 daysAndersen Eric and 3 othersDirector, Other: See remarksPPurchase+50.2K$12.50+$627.1K+12.2%459.7K after2 lots
Nov 14, 2023 (view filing)4:48 PM ETNov 10-134 daysAndersen Eric and 3 othersDirector, Other: See remarksPPurchase+53.6K$12.34+$661.9K+13.6%448.8K after4 lots
Nov 13, 2023 (view filing)4:05 PM ETNov 8-95 daysAndersen Eric and 3 othersDirector, Other: See remarksPPurchase+23.8K$12.16+$289.3K+5.8%437.2K after4 lots
Aug 14, 2023 (view filing)Aug 10-114 daysCrocker Gary LSee RemarksPPurchase+4.00K$12.48+$49.9K+3.1%133.1K after2 lots
Aug 9, 2023 (view filing)4:06 PM ETAug 7-82 daysAndersen Eric and 3 othersDirector, Other: See remarksPPurchase+221.6K$12.00+$2.66M+108.4%426.0K after4 lots
Mar 22, 2023 (view filing)4:06 PM ETMar 211 dayAndersen Eric and 3 othersDirector, Other: See remarksPPurchase+160.6K$11.52+$1.85M+81.5%357.5K after2 lots
Mar 1, 2023 (view filing)5:04 PM ETJan 30-3130 daysAndersen Eric and 3 othersDirector, Other: See remarksPPurchase+27.0K$11.36+$306.4K+9.1%324.3K afterAmended4 lots
Jan 31, 2023 (view filing)4:05 PM ETJan 274 daysAndersen Eric and 3 othersDirector, Other: See remarksPPurchase+21.9K$11.40+$249.3K+7.4%318.9K after2 lots
Jan 17, 2023 (view filing)4:05 PM ETJan 125 daysLevy Noah G. and 5 othersDirector, Other: See remarksPPurchase+100.0K$11.90+$1.19M+9.8%1.12M after
Jan 9, 2023 (view filing)Jan 63 daysRadeljevic AnaDirectorPPurchase+4.16K$12.03+$50.0KNew position4.16K after
Jan 4, 2023 (view filing)4:06 PM ETDec 30, 2022-Jan 3, 20235 daysLevy Noah G. and 5 othersDirector, Other: See remarksPPurchase+6.60K$11.24+$74.2K+0.7%1.02M after2 lots
Jan 4, 2023 (view filing)4:05 PM ETJan 31 dayAndersen Eric and 3 othersDirector, Other: See remarksPPurchase+30.6K$11.33+$347.2K+10.8%314.5K after2 lots
Jan 3, 2023 (view filing)4:16 PM ETDec 29-30, 20225 daysAndersen Eric and 3 othersDirector, Other: See remarksPPurchase+259.9K$10.67+$2.77M+561.0%306.3K after4 lots
Jul 15, 2022 (view filing)4:05 PM ETJul 132 daysLevy Noah G. and 5 othersDirector, Other: See remarksPPurchase+3.10K$5.89+$18.2K+0.4%754.1K after
Jul 13, 2022 (view filing)4:05 PM ETJul 11-122 daysLevy Noah G. and 5 othersDirector, Other: See remarksPPurchase+3.52K$5.89+$20.7K+0.5%751.0K after2 lots
Jul 11, 2022 (view filing)4:05 PM ETJul 7-84 daysLevy Noah G. and 5 othersDirector, Other: See remarksPPurchase+2.48K$5.99+$14.8K+0.3%747.5K after2 lots
Jul 5, 2022 (view filing)4:06 PM ETJun 305 daysLevy Noah G. and 5 othersDirector, Other: See remarksPPurchase+1.55K$5.76+$8.92K+0.2%745.0K after
Jun 27, 2022 (view filing)4:05 PM ETJun 23-244 daysLevy Noah G. and 5 othersDirector, Other: See remarksPPurchase+1.50K$5.99+$8.99K+0.2%743.5K after2 lots
Jun 21, 2022 (view filing)4:05 PM ETJun 16-175 daysLevy Noah G. and 5 othersDirector, Other: See remarksPPurchase+1.42K$5.78+$8.21K+0.2%742.0K after4 lots
Jun 16, 2022 (view filing)4:05 PM ETJun 14-152 daysLevy Noah G. and 5 othersDirector, Other: See remarksPPurchase+23.8K$5.20+$123.9K+3.3%741.4K after4 lots
Jun 14, 2022 (view filing)4:05 PM ETJun 10-134 daysLevy Noah G. and 5 othersDirector, Other: See remarksPPurchase+16.1K$5.06+$81.4K+2.2%731.2K after4 lots
Jun 13, 2022 (view filing)Jun 94 daysCrocker Gary LSee RemarksPPurchase+4.45K$5.15+$22.9K+3.5%131.1K after
Jun 9, 2022 (view filing)Jun 7-82 daysCrocker Gary LSee RemarksPPurchase+649$5.10+$3.31K+0.5%126.7K after2 lots
May 26, 2022 (view filing)May 24-252 daysCrocker Gary LSee RemarksPPurchase+2.46K$5.09+$12.5K+2.0%126.0K after2 lots
May 23, 2022 (view filing)May 194 daysCrocker Gary LSee RemarksPPurchase+512$5.04+$2.58K+0.4%123.5K after
May 19, 2022 (view filing)May 17-182 daysCrocker Gary LSee RemarksPPurchase+5.22K$5.08+$26.5K+4.4%123.0K after2 lots
May 16, 2022 (view filing)May 12-134 daysCrocker Gary LSee RemarksPPurchase+2.47K$5.04+$12.5K+2.1%117.8K after2 lots
Apr 25, 2022 (view filing)Apr 214 daysCrocker Gary LSee RemarksPPurchase+5.00K$6.00+$30.0K+4.5%115.3K after
Apr 1, 2022 (view filing)Mar 30-312 daysCrocker Gary LSee RemarksPPurchase+461$6.19+$2.85K+0.4%110.3K after2 lots
Mar 29, 2022 (view filing)Mar 281 dayCrocker Gary LSee RemarksPPurchase+5.00K$6.16+$30.8K+4.8%109.9K after
Mar 24, 2022 (view filing)Mar 222 daysCrocker Gary LSee RemarksPPurchase+400$6.11+$2.44K+0.4%104.9K after
Mar 17, 2022 (view filing)Mar 152 daysCrocker Gary LSee RemarksPPurchase+4.65K$6.14+$28.5K+4.7%104.5K after
Mar 15, 2022 (view filing)Mar 11-144 daysCrocker Gary LSee RemarksPPurchase+10.0K$6.05+$60.5K+11.1%99.8K after2 lots
Feb 23, 2022 (view filing)Feb 185 daysCrocker Gary LSee RemarksPPurchase+3.35K$5.96+$20.0K+3.9%89.8K after
Feb 18, 2022 (view filing)Feb 16-172 daysCrocker Gary LSee RemarksPPurchase+12.9K$6.17+$79.9K+17.6%86.5K after2 lots
Feb 16, 2022 (view filing)Feb 14-152 daysCrocker Gary LSee RemarksPPurchase+1.92K$5.98+$11.5K+2.7%73.5K after2 lots
Feb 1, 2022 (view filing)4:05 PM ETJan 28-314 daysLevy Noah G. and 5 othersDirector, Other: See remarksPPurchase+14.2K$4.53+$64.3K+2.0%724.3K after4 lots
Jan 31, 2022 (view filing)Jan 274 daysCrocker Gary LSee RemarksPPurchase+673$4.60+$3.10K+0.9%71.6K after
Jan 28, 2022 (view filing)4:05 PM ETJan 26-272 daysLevy Noah G. and 5 othersDirector, Other: See remarksPPurchase+35.8K$4.92+$176.3K+5.3%712.3K after2 lots
Jan 27, 2022 (view filing)Jan 261 dayCrocker Gary LSee RemarksPPurchase+3.10K$4.56+$14.1K+4.6%70.9K after
Jan 25, 2022 (view filing)Jan 241 dayNielsen Ulrik B.DirectorPPurchase+14.3K$4.24+$60.6K+63.0%37.0K after
Jan 25, 2022 (view filing)Jan 21-244 daysCrocker Gary LSee RemarksPPurchase+9.11K$4.40+$40.1K+15.5%67.8K after2 lots
Jan 20, 2022 (view filing)Jan 182 daysCrocker Gary LSee RemarksPPurchase+5.00K$4.54+$22.7K+9.3%58.7K after
Jan 18, 2022 (view filing)Jan 13-145 daysCrocker Gary LSee RemarksPPurchase+10.0K$4.47+$44.6K+22.9%53.7K after2 lots
Jan 13, 2022 (view filing)Jan 11-122 daysCrocker Gary LSee RemarksPPurchase+10.0K$4.18+$41.8K+29.6%43.7K after2 lots
Jan 12, 2022 (view filing)4:05 PM ETJan 10-112 daysLevy Noah G. and 5 othersDirector, Other: See remarksPPurchase+105.9K$3.98+$421.2K+18.6%676.5K after4 lots
Jan 10, 2022 (view filing)4:05 PM ETJan 73 daysLevy Noah G. and 5 othersDirector, Other: See remarksPPurchase+8.78K$3.82+$33.5K+1.4%655.8K after2 lots