diff --git a/Configuration/EventContent/python/EventContent_cff.py b/Configuration/EventContent/python/EventContent_cff.py
index 396b424cd3da2..59653a9b73828 100644
--- a/Configuration/EventContent/python/EventContent_cff.py
+++ b/Configuration/EventContent/python/EventContent_cff.py
@@ -670,6 +670,12 @@ def SwapKeepAndDrop(l):
 FEVTDEBUGHLTEventContent.outputCommands.append('keep *_*_StripDigiSimLink_*')
 FEVTDEBUGHLTEventContent.outputCommands.append('keep *_*_PixelDigiSimLink_*')
 
+from Configuration.ProcessModifiers.hltClusterSplitting_cff import hltClusterSplitting
+hltClusterSplitting.toModify(FEVTDEBUGHLTEventContent,
+                              outputCommands = FEVTDEBUGHLTEventContent.outputCommands+[
+                                  'keep *_hltPixelVertices_*_*'
+                              ])
+
 approxSiStripClusters.toModify(FEVTDEBUGHLTEventContent,
                               outputCommands = FEVTDEBUGHLTEventContent.outputCommands+[
                                   'keep *_hltSiStripClusters2ApproxClusters_*_*',
diff --git a/Configuration/ProcessModifiers/python/hltClusterSplitting_cff.py b/Configuration/ProcessModifiers/python/hltClusterSplitting_cff.py
new file mode 100644
index 0000000000000..b7855664076cd
--- /dev/null
+++ b/Configuration/ProcessModifiers/python/hltClusterSplitting_cff.py
@@ -0,0 +1,8 @@
+import FWCore.ParameterSet.Config as cms
+
+# This modifier enables
+# - saving pixel vertices at HLT;
+# - using those vertices in input for the cluster splitting and ak4CaloJets;
+
+hltClusterSplitting =  cms.Modifier()
+
diff --git a/Configuration/PyReleaseValidation/python/upgradeWorkflowComponents.py b/Configuration/PyReleaseValidation/python/upgradeWorkflowComponents.py
index 0dce1e1c1a852..80eb88c127ee3 100644
--- a/Configuration/PyReleaseValidation/python/upgradeWorkflowComponents.py
+++ b/Configuration/PyReleaseValidation/python/upgradeWorkflowComponents.py
@@ -2552,6 +2552,72 @@ def condition(self, fragment, stepList, key, hasHarvest):
     offset = 0.19002,
 )
 
+class UpgradeWorkflow_SplittingFromHLT(UpgradeWorkflow):
+    def setup_(self, step, stepName, stepDict, k, properties):
+        stepDict[stepName][k] = merge([{'--procModifiers': 'hltClusterSplitting'}, stepDict[step][k]])
+    def condition(self, fragment, stepList, key, hasHarvest):
+        return '2025' in key and fragment=="TTbar_14TeV"
+
+upgradeWFs['SplittingFromHLT'] = UpgradeWorkflow_SplittingFromHLT(
+    steps = [
+        'DigiTrigger',
+        'Digi',
+        'HLTOnly',
+        'RecoLocal',
+        'Reco',
+        'RecoFakeHLT',
+        'RecoGlobal',
+    ],
+    PU = [
+        'DigiTrigger',
+        'Digi',
+        'HLTOnly',
+        'RecoLocal',
+        'Reco',
+        'RecoFakeHLT',
+        'RecoGlobal',
+    ],
+    suffix = '_SplittingFromHLT',
+    offset = 0.19003,
+)
+
+class UpgradeWorkflow_SplittingProdLike(UpgradeWorkflow_ProdLike):
+    def __init__(self, suffix, offset,steps, PU):
+        super(UpgradeWorkflow_SplittingProdLike, self).__init__(steps, PU, suffix, offset)
+
+    def setup_(self, step, stepName, stepDict, k, properties):
+        # copy steps, then apply specializations
+        stepDict[stepName][k] = merge([{'--procModifiers': 'hltClusterSplitting'}, stepDict[step][k]])
+
+    def condition(self, fragment, stepList, key, hasHarvest):
+        return '2025' in key and fragment=="TTbar_14TeV"
+
+upgradeWFs['SplittingFromHLTProdLike'] = UpgradeWorkflow_SplittingProdLike(
+    steps = [
+    ],
+    PU = [
+        'GenSimHLBeamSpot14',
+        'Digi',
+        'DigiTrigger',
+        'HLTOnly',
+        'Reco',
+        'RecoFakeHLT',
+        'RecoGlobal',
+        'RecoNano',
+        'RecoNanoFakeHLT',
+        'HARVEST',
+        'HARVESTFakeHLT',
+        'HARVESTGlobal',
+        'HARVESTNano',
+        'HARVESTNanoFakeHLT',
+        'MiniAOD',
+        'ALCA',
+        'Nano',
+    ],
+    suffix = '_SplittingFromHLTProdLike',
+    offset = 0.1900321,
+)
+
 #
 # Simulates Bias Rail in Phase-2 OT PS modules and X% random bad Strips
 # in PS-s and SS sensors
diff --git a/RecoTracker/IterativeTracking/python/InitialStepPreSplitting_cff.py b/RecoTracker/IterativeTracking/python/InitialStepPreSplitting_cff.py
index a28f1a80d4389..4397d57b1a4eb 100644
--- a/RecoTracker/IterativeTracking/python/InitialStepPreSplitting_cff.py
+++ b/RecoTracker/IterativeTracking/python/InitialStepPreSplitting_cff.py
@@ -221,6 +221,12 @@
     src    = 'caloTowerForTrkPreSplitting',
     srcPVs = 'firstStepPrimaryVerticesPreSplitting'
 )
+
+from Configuration.ProcessModifiers.hltClusterSplitting_cff import hltClusterSplitting
+hltClusterSplitting.toModify(ak4CaloJetsForTrkPreSplitting,
+    srcPVs = 'hltPixelVertices'
+)
+
 jetsForCoreTrackingPreSplitting = jetsForCoreTracking.clone(
     src    = 'ak4CaloJetsForTrkPreSplitting'
 )
@@ -233,6 +239,8 @@
     cores         = 'jetsForCoreTrackingPreSplitting'
 )
 
+
+
 # Final sequence
 from RecoLocalTracker.SiPixelRecHits.SiPixelRecHits_cfi import siPixelRecHits
 from RecoTracker.MeasurementDet.MeasurementTrackerEventProducer_cfi import MeasurementTrackerEvent
@@ -254,6 +262,21 @@
                                        siPixelRecHits,
                                        MeasurementTrackerEvent,
                                        siPixelClusterShapeCache)
+
+hltClusterSplitting.toModify(siPixelClusters,
+    vertices = cms.InputTag("hltPixelVertices") 
+)
+
+InitialStepPreSplittingFromHLTTask = cms.Task(
+                                       caloTowerForTrkPreSplitting,
+                                       ak4CaloJetsForTrkPreSplitting,
+                                       jetsForCoreTrackingPreSplitting,
+                                       siPixelClusters,
+                                       siPixelRecHits,
+                                       MeasurementTrackerEvent,
+                                       siPixelClusterShapeCache)
+hltClusterSplitting.toReplaceWith(InitialStepPreSplittingTask, InitialStepPreSplittingFromHLTTask)
+
 InitialStepPreSplitting = cms.Sequence(InitialStepPreSplittingTask)
 _InitialStepPreSplittingTask_trackingPhase1 = InitialStepPreSplittingTask.copy()
 _InitialStepPreSplittingTask_trackingPhase1.replace(initialStepHitTripletsPreSplitting, cms.Task(initialStepHitTripletsPreSplitting,initialStepHitQuadrupletsPreSplitting))
diff --git a/Validation/RecoTrack/python/TrackValidation_cff.py b/Validation/RecoTrack/python/TrackValidation_cff.py
index 37063ed169dbe..62110c93f5e84 100644
--- a/Validation/RecoTrack/python/TrackValidation_cff.py
+++ b/Validation/RecoTrack/python/TrackValidation_cff.py
@@ -20,6 +20,7 @@
 import RecoTracker.IterativeTracking.iterativeTkConfig as _cfg
 import RecoTracker.IterativeTracking.iterativeTkUtils as _utils
 from Configuration.Eras.Modifier_fastSim_cff import fastSim
+from Configuration.ProcessModifiers.hltClusterSplitting_cff import hltClusterSplitting
 
 ### First define the stuff for the standard validation sequence
 ## Track selectors
@@ -47,8 +48,8 @@
                                  "displacedRegionalStepSeeds",
                                  "muonSeededSeedsInOut",
                                  "muonSeededSeedsOutIn"]
-
 _seedProducers_fastSim = [ x for x in _seedProducers if x not in _removeForFastSimSeedProducers]
+_seedProducers_hltSplit = [ x for x in _seedProducers if x not in ["initialStepSeedsPreSplitting"]]
 
 _removeForFastTrackProducers = ["initialStepTracksPreSplitting",
                                 "jetCoreRegionalStepTracks",
@@ -56,6 +57,7 @@
                                 "muonSeededTracksInOut",
                                 "muonSeededTracksOutIn"]
 _trackProducers_fastSim = [ x for x in _trackProducers if x not in _removeForFastTrackProducers]
+_trackProducers_hltSplit = [ x for x in _trackProducers if x not in ["initialStepTracksPreSplitting"]]
 
 def _algoToSelector(algo):
     sel = ""
@@ -813,6 +815,10 @@ def _uniqueFirstLayers(layerList):
     trackValidatorGsfTracks,
 ]))
 
+hltClusterSplitting.toReplaceWith(tracksValidation, tracksValidation.copyAndExclude([
+    trackValidatorBuildingPreSplitting,
+]))
+
 ### Then define stuff for standalone mode (i.e. MTV with RECO+DIGI input)
 
 # Select by originalAlgo and algoMask
@@ -1016,6 +1022,12 @@ def _uniqueFirstLayers(layerList):
     trackValidatorConversionTrackingOnly,
     trackValidatorBHadronTrackingOnly
 ]))
+
+hltClusterSplitting.toReplaceWith(trackValidatorsTrackingOnly, trackValidatorsTrackingOnly.copyAndExclude([
+    trackValidatorBuildingPreSplitting,
+    trackValidatorSeedingPreSplittingTrackingOnly,
+]))
+
 tracksValidationTrackingOnly = cms.Sequence(
     trackValidatorsTrackingOnly,
     tracksPreValidationTrackingOnly,