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    <nameOfIssuer>ADEIA INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>00676P107</cusip>
    <value>26580000</value>
    <shrsOrPrnAmt>
      <sshPrnamt>3000000</sshPrnamt>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>3000000</Sole>
      <Shared>0</Shared>
      <None>0</None>
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  <infoTable>
    <nameOfIssuer>ADTRAN HOLDINGS INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>00486H105</cusip>
    <value>17342910</value>
    <shrsOrPrnAmt>
      <sshPrnamt>1093500</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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      <Sole>1093500</Sole>
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      <None>0</None>
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  <infoTable>
    <nameOfIssuer>AIR PRODS &amp; CHEMS INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>009158106</cusip>
    <value>24125640</value>
    <shrsOrPrnAmt>
      <sshPrnamt>84000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>84000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
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  <infoTable>
    <nameOfIssuer>ANALOG DEVICES INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>032654105</cusip>
    <value>33132960</value>
    <shrsOrPrnAmt>
      <sshPrnamt>168000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>168000</Sole>
      <Shared>0</Shared>
      <None>0</None>
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  <infoTable>
    <nameOfIssuer>APPLIED DIGITAL CORP</nameOfIssuer>
    <titleOfClass>COM NEW</titleOfClass>
    <cusip>038169207</cusip>
    <value>1545600</value>
    <shrsOrPrnAmt>
      <sshPrnamt>690000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>690000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
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  <infoTable>
    <nameOfIssuer>AZZ INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>002474104</cusip>
    <value>27651420</value>
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      <sshPrnamt>670500</sshPrnamt>
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    <votingAuthority>
      <Sole>670500</Sole>
      <Shared>0</Shared>
      <None>0</None>
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  <infoTable>
    <nameOfIssuer>BOOZ ALLEN HAMILTON HLDG COR</nameOfIssuer>
    <titleOfClass>CL A</titleOfClass>
    <cusip>099502106</cusip>
    <value>9315345</value>
    <shrsOrPrnAmt>
      <sshPrnamt>100500</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>100500</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>BWX TECHNOLOGIES INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>05605H100</cusip>
    <value>35932800</value>
    <shrsOrPrnAmt>
      <sshPrnamt>570000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>570000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
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    <nameOfIssuer>CABOT CORP</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>127055101</cusip>
    <value>22072320</value>
    <shrsOrPrnAmt>
      <sshPrnamt>288000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>288000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
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    <nameOfIssuer>CHART INDS INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>16115Q308</cusip>
    <value>26584800</value>
    <shrsOrPrnAmt>
      <sshPrnamt>212000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>212000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
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    <nameOfIssuer>COMPASS MINERALS INTL INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>20451N101</cusip>
    <value>31461075</value>
    <shrsOrPrnAmt>
      <sshPrnamt>917500</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>917500</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
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    <nameOfIssuer>COPART INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>217204106</cusip>
    <value>16771830</value>
    <shrsOrPrnAmt>
      <sshPrnamt>223000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>223000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
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    <nameOfIssuer>CROWN HLDGS INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>228368106</cusip>
    <value>27294300</value>
    <shrsOrPrnAmt>
      <sshPrnamt>330000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>330000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
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    <nameOfIssuer>CTS CORP</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>126501105</cusip>
    <value>16525971</value>
    <shrsOrPrnAmt>
      <sshPrnamt>334128</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>334128</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
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    <nameOfIssuer>ENPRO INDS INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>29355X107</cusip>
    <value>20674110</value>
    <shrsOrPrnAmt>
      <sshPrnamt>199000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>199000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>EVENTBRITE INC</nameOfIssuer>
    <titleOfClass>COM CL A</titleOfClass>
    <cusip>29975E109</cusip>
    <value>16216200</value>
    <shrsOrPrnAmt>
      <sshPrnamt>1890000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>1890000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>EVERBRIDGE INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>29978A104</cusip>
    <value>23714280</value>
    <shrsOrPrnAmt>
      <sshPrnamt>684000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>684000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>GREAT LAKES DREDGE &amp; DOCK CO</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>390607109</cusip>
    <value>18136200</value>
    <shrsOrPrnAmt>
      <sshPrnamt>3340000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>3340000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>HARVARD BIOSCIENCE INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>416906105</cusip>
    <value>11393340</value>
    <shrsOrPrnAmt>
      <sshPrnamt>2712700</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>2712700</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
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    <nameOfIssuer>HUNTINGTON INGALLS INDS INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>446413106</cusip>
    <value>21530080</value>
    <shrsOrPrnAmt>
      <sshPrnamt>104000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>104000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>MANCHESTER UTD PLC NEW</nameOfIssuer>
    <titleOfClass>ORD CL A</titleOfClass>
    <cusip>G5784H106</cusip>
    <value>5703625</value>
    <shrsOrPrnAmt>
      <sshPrnamt>257500</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>257500</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>MATIV HOLDINGS INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>808541106</cusip>
    <value>16016620</value>
    <shrsOrPrnAmt>
      <sshPrnamt>746000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>746000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>MATRIX SVC CO</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>576853105</cusip>
    <value>8947800</value>
    <shrsOrPrnAmt>
      <sshPrnamt>1657000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>1657000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>MRC GLOBAL INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>55345K103</cusip>
    <value>18934560</value>
    <shrsOrPrnAmt>
      <sshPrnamt>1948000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>1948000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>NLIGHT INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>65487K100</cusip>
    <value>6108000</value>
    <shrsOrPrnAmt>
      <sshPrnamt>600000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>600000</Sole>
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      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>ORION ENGINEERED CARBONS S A</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>L72967109</cusip>
    <value>52978354</value>
    <shrsOrPrnAmt>
      <sshPrnamt>2030600</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>2030600</Sole>
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      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>RENTOKIL INITIAL PLC</nameOfIssuer>
    <titleOfClass>SPONSORED ADR</titleOfClass>
    <cusip>760125104</cusip>
    <value>21559155</value>
    <shrsOrPrnAmt>
      <sshPrnamt>590500</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>590500</Sole>
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      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>RISKIFIED LTD</nameOfIssuer>
    <titleOfClass>SHS CL A</titleOfClass>
    <cusip>M8216R109</cusip>
    <value>4997040</value>
    <shrsOrPrnAmt>
      <sshPrnamt>886000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>886000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>SEALED AIR CORP NEW</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>81211K100</cusip>
    <value>15930770</value>
    <shrsOrPrnAmt>
      <sshPrnamt>347000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>347000</Sole>
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      <None>0</None>
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  </infoTable>
  <infoTable>
    <nameOfIssuer>SPDR S&amp;P 500 ETF TR</nameOfIssuer>
    <titleOfClass>TR UNIT</titleOfClass>
    <cusip>78462F103</cusip>
    <value>16784990</value>
    <shrsOrPrnAmt>
      <sshPrnamt>41000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <putCall>Put</putCall>
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    <votingAuthority>
      <Sole>41000</Sole>
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      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>SUMMIT MATLS INC</nameOfIssuer>
    <titleOfClass>CL A</titleOfClass>
    <cusip>86614U100</cusip>
    <value>12051270</value>
    <shrsOrPrnAmt>
      <sshPrnamt>423000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>423000</Sole>
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      <None>0</None>
    </votingAuthority>
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    <nameOfIssuer>THERMON GROUP HLDGS INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>88362T103</cusip>
    <value>41180300</value>
    <shrsOrPrnAmt>
      <sshPrnamt>1652500</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>1652500</Sole>
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      <None>0</None>
    </votingAuthority>
  </infoTable>
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    <nameOfIssuer>UNDER ARMOUR INC</nameOfIssuer>
    <titleOfClass>CL A</titleOfClass>
    <cusip>904311107</cusip>
    <value>22206600</value>
    <shrsOrPrnAmt>
      <sshPrnamt>2340000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>2340000</Sole>
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      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>VALMONT INDS INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>920253101</cusip>
    <value>32726200</value>
    <shrsOrPrnAmt>
      <sshPrnamt>102500</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>102500</Sole>
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      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>VARONIS SYS INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>922280102</cusip>
    <value>27648630</value>
    <shrsOrPrnAmt>
      <sshPrnamt>1063000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>1063000</Sole>
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      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>VIMEO INC</nameOfIssuer>
    <titleOfClass>COMMON STOCK</titleOfClass>
    <cusip>92719V100</cusip>
    <value>11687245</value>
    <shrsOrPrnAmt>
      <sshPrnamt>3051500</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>3051500</Sole>
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      <None>0</None>
    </votingAuthority>
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    <nameOfIssuer>VISHAY PRECISION GROUP INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>92835K103</cusip>
    <value>27707760</value>
    <shrsOrPrnAmt>
      <sshPrnamt>663500</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>663500</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
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    <nameOfIssuer>WASTE CONNECTIONS INC</nameOfIssuer>
    <titleOfClass>COM</titleOfClass>
    <cusip>94106B101</cusip>
    <value>28996095</value>
    <shrsOrPrnAmt>
      <sshPrnamt>208500</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
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    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>208500</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
  <infoTable>
    <nameOfIssuer>XPERI INC</nameOfIssuer>
    <titleOfClass>COMMON STOCK</titleOfClass>
    <cusip>98423J101</cusip>
    <value>7924250</value>
    <shrsOrPrnAmt>
      <sshPrnamt>725000</sshPrnamt>
      <sshPrnamtType>SH</sshPrnamtType>
    </shrsOrPrnAmt>
    <investmentDiscretion>SOLE</investmentDiscretion>
    <votingAuthority>
      <Sole>725000</Sole>
      <Shared>0</Shared>
      <None>0</None>
    </votingAuthority>
  </infoTable>
</informationTable>
