diff --git a/DQM/SiPixelPhase1Heterogeneous/plugins/SiPixelPhase1MonitorVertexSoA.cc b/DQM/SiPixelPhase1Heterogeneous/plugins/SiPixelPhase1MonitorVertexSoA.cc
index 2ae7480f2b7df..c51ac6ae96138 100644
--- a/DQM/SiPixelPhase1Heterogeneous/plugins/SiPixelPhase1MonitorVertexSoA.cc
+++ b/DQM/SiPixelPhase1Heterogeneous/plugins/SiPixelPhase1MonitorVertexSoA.cc
@@ -26,6 +26,7 @@
 
 class SiPixelPhase1MonitorVertexSoA : public DQMEDAnalyzer {
 public:
+  using IndToEdm = std::vector<uint16_t>;
   explicit SiPixelPhase1MonitorVertexSoA(const edm::ParameterSet&);
   ~SiPixelPhase1MonitorVertexSoA() override;
   void bookHistograms(DQMStore::IBooker& ibooker, edm::Run const& iRun, edm::EventSetup const& iSetup) override;
@@ -35,6 +36,7 @@ class SiPixelPhase1MonitorVertexSoA : public DQMEDAnalyzer {
 private:
   edm::EDGetTokenT<ZVertexHeterogeneous> tokenSoAVertex_;
   edm::EDGetTokenT<reco::BeamSpot> tokenBeamSpot_;
+  edm::EDGetTokenT<IndToEdm> tokenTracks_;
   std::string topFolderName_;
   MonitorElement* hnVertex;
   MonitorElement* hx;
@@ -42,6 +44,7 @@ class SiPixelPhase1MonitorVertexSoA : public DQMEDAnalyzer {
   MonitorElement* hz;
   MonitorElement* hchi2;
   MonitorElement* hptv2;
+  MonitorElement* hntrks;
 };
 
 //
@@ -51,6 +54,7 @@ class SiPixelPhase1MonitorVertexSoA : public DQMEDAnalyzer {
 SiPixelPhase1MonitorVertexSoA::SiPixelPhase1MonitorVertexSoA(const edm::ParameterSet& iConfig) {
   tokenSoAVertex_ = consumes<ZVertexHeterogeneous>(iConfig.getParameter<edm::InputTag>("pixelVertexSrc"));
   tokenBeamSpot_ = consumes<reco::BeamSpot>(iConfig.getParameter<edm::InputTag>("beamSpotSrc"));
+  tokenTracks_ = consumes<IndToEdm>(iConfig.getParameter<edm::InputTag>("pixelTrackSrc"));
   topFolderName_ = iConfig.getParameter<std::string>("TopFolderName");
 }
 
@@ -64,6 +68,7 @@ SiPixelPhase1MonitorVertexSoA::~SiPixelPhase1MonitorVertexSoA() {
 void SiPixelPhase1MonitorVertexSoA::analyze(const edm::Event& iEvent, const edm::EventSetup& iSetup) {
   auto const& vsoa = *(iEvent.get(tokenSoAVertex_).get());
   int nVertices = vsoa.nvFinal;
+  auto const& pixtrks = iEvent.get(tokenTracks_);
   auto bsHandle = iEvent.getHandle(tokenBeamSpot_);
   float x0 = 0., y0 = 0., z0 = 0., dxdz = 0., dydz = 0.;
   if (!bsHandle.isValid()) {
@@ -84,9 +89,14 @@ void SiPixelPhase1MonitorVertexSoA::analyze(const edm::Event& iEvent, const edm:
     hx->Fill(x);
     hy->Fill(y);
     hz->Fill(z);
-    if (vsoa.ndof[iv] != 0)
-      hchi2->Fill(vsoa.chi2[iv] / vsoa.ndof[iv]);
+    hchi2->Fill(vsoa.chi2[iv]);
     hptv2->Fill(vsoa.ptv2[iv]);
+    unsigned int ntk = 0;
+    for (auto k = 0U; k < pixtrks.size(); ++k) {
+      if (vsoa.idv[k] == int16_t(vsoa.sortInd[iv]))
+        ntk++;
+    }
+    hntrks->Fill(ntk);
   }
   hnVertex->Fill(nVertices);
 }
@@ -104,14 +114,16 @@ void SiPixelPhase1MonitorVertexSoA::bookHistograms(DQMStore::IBooker& ibooker,
   hx = ibooker.book1D("vx", ";Vertez x;#entries", 10, -5., 5.);
   hy = ibooker.book1D("vy", ";Vertez y;#entries", 10, -5., 5.);
   hz = ibooker.book1D("vz", ";Vertez z;#entries", 30, -30., 30);
-  hchi2 = ibooker.book1D("chi2", ";Vertex chi-squared over ndof;#entries", 40, 0., 20.);
+  hchi2 = ibooker.book1D("chi2", ";Vertex chi-squared;#entries", 40, 0., 20.);
   hptv2 = ibooker.book1D("ptsq", ";Vertex p_T squared;#entries", 200, 0., 200.);
+  hntrks = ibooker.book1D("ntrk", ";#tracks associated;#entries", 100, -0.5, 99.5);
 }
 
 void SiPixelPhase1MonitorVertexSoA::fillDescriptions(edm::ConfigurationDescriptions& descriptions) {
   // monitorpixelVertexSoA
   edm::ParameterSetDescription desc;
   desc.add<edm::InputTag>("pixelVertexSrc", edm::InputTag("pixelVerticesSoA"));
+  desc.add<edm::InputTag>("pixelTrackSrc", edm::InputTag("pixelTracks"));
   desc.add<edm::InputTag>("beamSpotSrc", edm::InputTag("offlineBeamSpot"));
   desc.add<std::string>("TopFolderName", "SiPixelHeterogeneous/PixelVertexSoA");
   descriptions.addWithDefaultLabel(desc);