diff --git a/ajax_bib_range.php b/ajax_bib_range.php
index 9a390d3..a74ee10 100644
--- a/ajax_bib_range.php
+++ b/ajax_bib_range.php
@@ -31,6 +31,7 @@ $arrBibAjaxActions = [
     'refresh_ranges_data',
     'batch_go',
     'batch_apply',
+    'batch_apply_chunk',
     'reset_preview',
     'reset_apply',
     'save_team_mode',
@@ -515,46 +516,7 @@ if ($action == 'batch_apply') {
 
     $exec = fxProcessBatchAssignments($epr_id, $participants, $tabRanges, 'execute');
 
-    $tabRangesInfos = fxInfosBibRange($epr_id);
-    $ids = array_map('intval', $ranges);
-
-    $tabRangesInfos = array_filter($tabRangesInfos, function($r) use ($ids) {
-        return in_array((int)$r['epr_bib_id'], $ids);
-    });
-
-    $summary = fxBuildBatchSummaryFromRanges($tabRangesInfos, $participants, $epr_id);
-
-    $assigned = count($exec);
-    $total    = count($participants);
-    $remaining = max(0, $total - $assigned);
-    $status = 'success';
-
-    if ($assigned === 0) {
-        $status = 'error';
-    } elseif ($assigned < $total) {
-        $status = 'partial';
-    }
-    if ($assigned === 0) {
-
-        $info = fxBibMsg('bib_v4_ajax_assign_none');
-
-    } elseif ($assigned === $total) {
-
-        $info = fxBibMsg('bib_v4_ajax_assign_full', $assigned);
-
-    } else {
-
-        $info = fxBibMsg('bib_v4_ajax_assign_partial', $assigned, $remaining);
-    }
-    $html = renderBibView(
-        $epr_id,
-        0,
-        $strLangue,
-        'execute',
-        $exec,
-        fxBibTexte('bib_v4_ajax_title_assign'),
-        $info,$status
-    );
+    $html = fxBibBuildBatchApplyHtml($epr_id, $exec, count($participants), $strLangue);
 
     echo json_encode([
         'success' => true,
@@ -563,6 +525,98 @@ if ($action == 'batch_apply') {
 
     exit;
 }
+
+// MSIN-4433 — GO batch par paquets : progression réelle + relecture BD entre paquets.
+if ($action == 'batch_apply_chunk') {
+
+    $epr_id = intval($_POST['epr_id'] ?? 0);
+    $ranges = json_decode($_POST['ranges'] ?? '[]', true);
+    $ba_id  = intval($_POST['ba_id'] ?? 0);
+    $intChunkSize = (int)($_POST['chunk_size'] ?? 50);
+    $intTotalInitial = (int)($_POST['total_initial'] ?? 0);
+    $blnBatchReset = ((int)($_POST['batch_reset'] ?? 0) === 1);
+
+    if ($intChunkSize < 1) {
+        $intChunkSize = 50;
+    }
+    if ($intChunkSize > 100) {
+        $intChunkSize = 100;
+    }
+
+    $lockCheck = fxBibAssertRangesUnlocked($epr_id, is_array($ranges) ? $ranges : []);
+    if (!$lockCheck['success']) {
+        echo json_encode([
+            'success' => false,
+            'message' => $lockCheck['message'] ?? fxBibMsg('bib_v4_ajax_range_locked')
+        ]);
+        exit;
+    }
+
+    $strSessionKey = fxBibBatchExecSessionKey($epr_id);
+
+    if ($blnBatchReset) {
+        $_SESSION[$strSessionKey] = [];
+    } elseif (!isset($_SESSION[$strSessionKey]) || !is_array($_SESSION[$strSessionKey])) {
+        $_SESSION[$strSessionKey] = [];
+    }
+
+    $participants = fxGetParticipantsForBatchAssign($epr_id, $ba_id);
+
+    if ($intTotalInitial <= 0) {
+        $intTotalInitial = count($participants) + count($_SESSION[$strSessionKey]);
+    }
+
+    if (empty($participants)) {
+        $execAll = $_SESSION[$strSessionKey];
+        unset($_SESSION[$strSessionKey]);
+
+        $html = fxBibBuildBatchApplyHtml($epr_id, $execAll, $intTotalInitial, $strLangue);
+
+        echo json_encode([
+            'success' => true,
+            'complete' => true,
+            'total_initial' => $intTotalInitial,
+            'processed' => $intTotalInitial,
+            'assigned_total' => count($execAll),
+            'assigned_chunk' => 0,
+            'html' => $html
+        ]);
+        exit;
+    }
+
+    $tabChunk = array_slice($participants, 0, $intChunkSize);
+    $tabRanges = fxGetRangesForBatchAssign($epr_id, $ranges);
+    $execChunk = fxProcessBatchAssignments($epr_id, $tabChunk, $tabRanges, 'execute');
+
+    $_SESSION[$strSessionKey] = array_merge($_SESSION[$strSessionKey], $execChunk);
+
+    $intRemaining = count(fxGetParticipantsForBatchAssign($epr_id, $ba_id));
+    $intProcessed = max(0, $intTotalInitial - $intRemaining);
+    $blnComplete = ($intRemaining === 0);
+
+    // MSIN-4433 — Dossards épuisés : clôturer si aucune progression sur ce paquet.
+    if (!$blnComplete && empty($execChunk)) {
+        $blnComplete = true;
+    }
+
+    $arrResponse = [
+        'success' => true,
+        'complete' => $blnComplete,
+        'total_initial' => $intTotalInitial,
+        'processed' => $intProcessed,
+        'assigned_total' => count($_SESSION[$strSessionKey]),
+        'assigned_chunk' => count($execChunk),
+    ];
+
+    if ($blnComplete) {
+        $execAll = $_SESSION[$strSessionKey];
+        unset($_SESSION[$strSessionKey]);
+        $arrResponse['html'] = fxBibBuildBatchApplyHtml($epr_id, $execAll, $intTotalInitial, $strLangue);
+    }
+
+    echo json_encode($arrResponse);
+    exit;
+}
 // =====================
 // RESET PREVIEW
 // =====================
diff --git a/css/ms1-loader.css b/css/ms1-loader.css
index e00a612..74557af 100644
--- a/css/ms1-loader.css
+++ b/css/ms1-loader.css
@@ -68,3 +68,33 @@
     font-size: 1.1rem;
     font-weight: 600;
 }
+
+.ms1-loader__progress {
+    width: 100%;
+    min-width: 220px;
+    margin-top: 0.25rem;
+}
+
+.ms1-loader__progress-track {
+    width: 100%;
+    height: 8px;
+    background: #e8e8e8;
+    border-radius: 4px;
+    overflow: hidden;
+}
+
+.ms1-loader__progress-fill {
+    height: 100%;
+    width: 0;
+    background: linear-gradient(90deg, #2e7d32, #43a047);
+    border-radius: 4px;
+    transition: width 0.25s ease;
+}
+
+.ms1-loader__progress-pct {
+    display: block;
+    margin-top: 0.35rem;
+    font-size: 0.85rem;
+    font-weight: 600;
+    color: #555;
+}
diff --git a/inc_footer_scripts.php b/inc_footer_scripts.php
index 4226943..369daa7 100644
--- a/inc_footer_scripts.php
+++ b/inc_footer_scripts.php
@@ -2393,6 +2393,165 @@ if ($strLangue == 'fr') {
                 });
             }
 
+            var BIB_BATCH_CHUNK_SIZE = 50;
+
+            function bibBatchProgressShow(processed, total) {
+                var intTotal = total > 0 ? total : 1;
+                var msg = bibJsFmt('jsBatchProgress', processed, intTotal);
+                if (window.Ms1Loader && Ms1Loader.showProgress) {
+                    Ms1Loader.showProgress(processed, intTotal, msg);
+                } else {
+                    bibLoaderShow();
+                }
+            }
+
+            function bibBatchProgressHide() {
+                if (window.Ms1Loader && Ms1Loader.hide) {
+                    Ms1Loader.hide();
+                } else {
+                    bibLoaderHide();
+                }
+            }
+
+            function bibAfterBatchGoSuccess(row, data, isResetMode) {
+                let existing = document.querySelector('.epr-row-view');
+                if (existing) {
+                    existing.remove();
+                }
+
+                if (data.html) {
+                    row.insertAdjacentHTML('afterend', data.html);
+                }
+
+                if (isResetMode) {
+                    row.classList.remove('reset-mode');
+                    row.dataset.mode = '';
+
+                    let btnReset = row.querySelector('.btn-reset');
+                    if (btnReset) {
+                        btnReset.textContent = row.dataset.resetLabel || btnReset.textContent;
+                    }
+                }
+                row.classList.remove('batch-mode');
+
+                let container = row.querySelector('.bib-container');
+                if (container) {
+                    container.classList.remove('batch-mode');
+                }
+
+                let btnBatch = row.querySelector('.btn-assign-batch');
+                if (btnBatch) {
+                    btnBatch.textContent = row.dataset.batchLabel || btnBatch.textContent;
+                }
+
+                row.querySelectorAll('.bib-start, .bib-qty, .bib-end').forEach(input => {
+                    input.removeAttribute('readonly');
+                });
+
+                row.querySelectorAll('.batch-select-range').forEach(cb => {
+                    cb.checked = false;
+                    cb.disabled = false;
+                });
+
+                syncBibUiState(row);
+
+                bibFetch('/ajax_bib_range.php', {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+                    body:
+                        'action=refresh_ranges'
+                        + '&epr_id=' + encodeURIComponent(row.dataset.eprId)
+                        + '&mode=assign'
+                        + bibAjaxLangSuffix()
+                })
+                    .then(res => res.json())
+                    .then(refresh => {
+
+                        if (!refresh.success) return;
+
+                        let container = setBibContainerHtml(row, refresh.html);
+                        if (!container) return;
+                        bibFetch('/ajax_bib_range.php', {
+                            method: 'POST',
+                            headers: {
+                                'Content-Type': 'application/x-www-form-urlencoded'
+                            },
+                            body:
+                                'action=batch_analysis'
+                                + '&epr_id=' + encodeURIComponent(row.dataset.eprId)
+                                + bibAjaxLangSuffix()
+                        })
+                            .then(res => res.json())
+                            .then(stats => {
+
+                                if (!stats.success) return;
+
+                                bibSyncEprBibStats(row, stats.info);
+                                syncBibUiState(row);
+                            });
+                    });
+            }
+
+            function bibFetchBatchApplyChunk(row, selected, ba_id, opts) {
+                opts = opts || {};
+                var body =
+                    'action=batch_apply_chunk'
+                    + '&epr_id=' + encodeURIComponent(row.dataset.eprId)
+                    + '&ranges=' + encodeURIComponent(JSON.stringify(selected))
+                    + '&ba_id=' + encodeURIComponent(ba_id)
+                    + '&chunk_size=' + BIB_BATCH_CHUNK_SIZE
+                    + '&total_initial=' + (opts.totalInitial || 0)
+                    + '&batch_reset=' + (opts.batchReset ? 1 : 0)
+                    + bibAjaxLangSuffix();
+
+                return fetch('/ajax_bib_range.php', {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+                    body: body
+                }).then(function (res) { return res.json(); });
+            }
+
+            function bibRunBatchApplyChunks(row, selected, ba_id) {
+                var totalInitial = bibRowPendingBibs(row);
+                var batchReset = true;
+
+                bibBatchProgressShow(0, totalInitial > 0 ? totalInitial : 1);
+
+                function runChunk() {
+                    return bibFetchBatchApplyChunk(row, selected, ba_id, {
+                        batchReset: batchReset,
+                        totalInitial: totalInitial
+                    }).then(function (data) {
+                        if (!data.success) {
+                            throw new Error(data.message || bibJs('jsErrGeneric'));
+                        }
+
+                        if (data.total_initial) {
+                            totalInitial = data.total_initial;
+                        }
+                        batchReset = false;
+
+                        var processed = data.processed || 0;
+                        bibBatchProgressShow(processed, totalInitial);
+
+                        if (data.complete) {
+                            bibAfterBatchGoSuccess(row, data, false);
+                            return;
+                        }
+
+                        return runChunk();
+                    });
+                }
+
+                runChunk()
+                    .catch(function (err) {
+                        alert(err.message || bibJs('jsErrGeneric'));
+                    })
+                    .finally(function () {
+                        bibBatchProgressHide();
+                    });
+            }
+
             function bibRowPendingBibs(row) {
                 if (!row) return 0;
                 return parseInt(row.dataset.bibAAssigner || '0', 10) || 0;
@@ -3939,106 +4098,34 @@ if ($strLangue == 'fr') {
                 let isResetMode = row.dataset.mode === 'reset';
                 let ba_id = row.querySelector('.batch-order').value;
 
-                bibFetch('/ajax_bib_range.php', {
-                    method: 'POST',
-                    headers: {
-                        'Content-Type': 'application/x-www-form-urlencoded'
-                    },
-                    body:
-                        (isResetMode ? 'action=reset_apply' : 'action=batch_apply')
-                        + '&epr_id=' + encodeURIComponent(row.dataset.eprId)
-                        + '&ranges=' + encodeURIComponent(JSON.stringify(selected))
-                        + '&ba_id=' + encodeURIComponent(ba_id)
-                        + bibAjaxLangSuffix()
-                })
-                    .then(res => res.json())
-                    .then(data => {
+                if (isResetMode) {
+                    bibFetch('/ajax_bib_range.php', {
+                        method: 'POST',
+                        headers: {
+                            'Content-Type': 'application/x-www-form-urlencoded'
+                        },
+                        body:
+                            'action=reset_apply'
+                            + '&epr_id=' + encodeURIComponent(row.dataset.eprId)
+                            + '&ranges=' + encodeURIComponent(JSON.stringify(selected))
+                            + '&ba_id=' + encodeURIComponent(ba_id)
+                            + bibAjaxLangSuffix()
+                    })
+                        .then(res => res.json())
+                        .then(data => {
 
-                        if (!data.success) {
-                            alert(data.message || bibJs('jsErrGeneric'));
-                            return;
-                        }
-
-                        let existing = document.querySelector('.epr-row-view');
-                        if (existing) {
-                            existing.remove();
-                        }
-
-                        // afficher résultat
-                        row.insertAdjacentHTML('afterend', data.html);
-
-                        // =====================
-                        // RESET UI BATCH
-                        // =====================
-                        if (isResetMode) {
-                            row.classList.remove('reset-mode');
-                            row.dataset.mode = '';
-
-                            let btnReset = row.querySelector('.btn-reset');
-                            if (btnReset) {
-                                btnReset.textContent = row.dataset.resetLabel || btnReset.textContent;
+                            if (!data.success) {
+                                alert(data.message || bibJs('jsErrGeneric'));
+                                return;
                             }
-                        }
-                        row.classList.remove('batch-mode');
 
-                        let container = row.querySelector('.bib-container');
-                        if (container) {
-                            container.classList.remove('batch-mode');
-                        }
-
-                        let btnBatch = row.querySelector('.btn-assign-batch');
-                        if (btnBatch) {
-                            btnBatch.textContent = row.dataset.batchLabel || btnBatch.textContent;
-                        }
-
-                        row.querySelectorAll('.bib-start, .bib-qty, .bib-end').forEach(input => {
-                            input.removeAttribute('readonly');
+                            bibAfterBatchGoSuccess(row, data, true);
                         });
 
-                        row.querySelectorAll('.batch-select-range').forEach(cb => {
-                            cb.checked = false;
-                            cb.disabled = false;
-                        });
+                    return;
+                }
 
-                        syncBibUiState(row);
-
-                        bibFetch('/ajax_bib_range.php', {
-                            method: 'POST',
-                            headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
-                            body:
-                                'action=refresh_ranges'
-                                + '&epr_id=' + encodeURIComponent(row.dataset.eprId)
-                                + '&mode=assign'
-                        + bibAjaxLangSuffix()
-                        })
-                            .then(res => res.json())
-                            .then(refresh => {
-
-                                if (!refresh.success) return;
-
-                                let container = setBibContainerHtml(row, refresh.html);
-                                if (!container) return;
-                                bibFetch('/ajax_bib_range.php', {
-                                    method: 'POST',
-                                    headers: {
-                                        'Content-Type': 'application/x-www-form-urlencoded'
-                                    },
-                                    body:
-                                        'action=batch_analysis'
-                                        + '&epr_id=' + encodeURIComponent(row.dataset.eprId)
-                                        + bibAjaxLangSuffix()
-                                })
-                                    .then(res => res.json())
-                                    .then(stats => {
-
-                                        if (!stats.success) return;
-
-                                        bibSyncEprBibStats(row, stats.info);
-                                        syncBibUiState(row);
-                                    });
-                            });
-
-                    });
+                bibRunBatchApplyChunks(row, selected, ba_id);
 
                 return;
             }
diff --git a/js/ms1-loader.js b/js/ms1-loader.js
index d804c60..f820b62 100644
--- a/js/ms1-loader.js
+++ b/js/ms1-loader.js
@@ -42,6 +42,7 @@
         if (!$preloader.length) {
             return;
         }
+        clearProgress();
         if (message != null && message !== '') {
             var $text = $('#preloader_text');
             if ($text.length) {
@@ -51,7 +52,54 @@
         $preloader.show();
     }
 
+    function clearProgress() {
+        $('#spinner .ms1-loader__progress').remove();
+    }
+
+    /**
+     * MSIN-4433 — Overlay avec coureur + barre de progression (% réel).
+     * @param {number} current
+     * @param {number} total
+     * @param {string} [message]
+     */
+    function showProgress(current, total, message) {
+        var $preloader = $('#preloader');
+        if (!$preloader.length) {
+            return;
+        }
+
+        var intCurrent = Math.max(0, parseInt(current, 10) || 0);
+        var intTotal = Math.max(1, parseInt(total, 10) || 1);
+        var intPct = Math.min(100, Math.round((intCurrent / intTotal) * 100));
+
+        var $spinner = $('#spinner');
+        var $bar = $spinner.find('.ms1-loader__progress');
+        if (!$bar.length) {
+            $bar = $('<div class="ms1-loader__progress" role="progressbar" aria-valuemin="0" aria-valuemax="100">'
+                + '<div class="ms1-loader__progress-track">'
+                + '<div class="ms1-loader__progress-fill"></div>'
+                + '</div>'
+                + '<span class="ms1-loader__progress-pct"></span>'
+                + '</div>');
+            $('#preloader_text').after($bar);
+        }
+
+        $bar.attr('aria-valuenow', intPct);
+        $bar.find('.ms1-loader__progress-fill').css('width', intPct + '%');
+        $bar.find('.ms1-loader__progress-pct').text(intPct + '%');
+
+        if (message != null && message !== '') {
+            var $text = $('#preloader_text');
+            if ($text.length) {
+                $text.html(message);
+            }
+        }
+
+        $preloader.show();
+    }
+
     function hide() {
+        clearProgress();
         $('#preloader').fadeOut('slow');
     }
 
@@ -59,6 +107,7 @@
         init: init,
         inlineHtml: inlineHtml,
         show: show,
+        showProgress: showProgress,
         hide: hide
     };
 }(window, jQuery));
diff --git a/php/inc_fx_promoteur.php b/php/inc_fx_promoteur.php
index aa518b9..78644de 100644
--- a/php/inc_fx_promoteur.php
+++ b/php/inc_fx_promoteur.php
@@ -3106,6 +3106,7 @@ function fxBibModuleJsDataAttrs() {
         'range-invalid'       => 'bib_v4_js_range_invalid',
         'range-invalid-end'   => 'bib_v4_js_range_invalid_end',
         'range-invalid-qty'   => 'bib_v4_js_range_invalid_qty',
+        'batch-progress'      => 'bib_v4_js_batch_progress',
     ];
     $html = '';
     foreach ($map as $attr => $clef) {
@@ -5762,47 +5763,20 @@ function fxLoadUsedBibsForBatch($epr_id) {
  * @param int    $teamMode  epr_bib_team_mode (1 = individuel, 3 = 1 équipe = 1 dossard)
  */
 function fxFindNextBatchBib($epr_id, $tabRanges, $mode, &$usedBib, $teamMode = 1) {
-    global $objDatabase;
-
     $epr_id = intval($epr_id);
     $teamMode = (int)$teamMode;
-    $sqlBibNum = fxBibSqlNoBibUnsigned('no_bib');
 
     foreach ($tabRanges as $range) {
         $start = (int)$range['start'];
         $end   = (int)$range['end'];
 
         for ($i = $start; $i <= $end; $i++) {
-            if ($mode === 'simulation') {
-                // Simulation : cache mémoire (même logique solo/équipe via $teamBibMap en amont)
-                if (!isset($usedBib[$i])) {
+            if (!isset($usedBib[$i])) {
+                // MSIN-4433 — simulation : réserve en mémoire ; execute : réservation après UPDATE réussi.
+                if ($mode === 'simulation') {
                     $usedBib[$i] = true;
-                    return $i;
-                }
-            } elseif ($teamMode === 3) {
-                // GO — mode « 1 équipe = 1 dossard »
-                // Le numéro est libre s'il n'est pas déjà pris par une autre équipe.
-                $sqlCheck = "
-                    SELECT COUNT(DISTINCT pec_id)
-                    FROM resultats_participants
-                    WHERE epr_id = $epr_id
-                      AND $sqlBibNum = $i
-                      AND pec_id > 0
-                ";
-                if ((int)$objDatabase->fxGetVar($sqlCheck) === 0) {
-                    return $i;
-                }
-            } else {
-                // GO — solo ou dossards individuels : un numéro ne peut servir qu'à une personne
-                $sqlCheck = "
-                    SELECT COUNT(*)
-                    FROM resultats_participants
-                    WHERE epr_id = $epr_id
-                      AND $sqlBibNum = $i
-                ";
-                if ((int)$objDatabase->fxGetVar($sqlCheck) === 0) {
-                    return $i;
                 }
+                return $i;
             }
         }
     }
@@ -5810,6 +5784,84 @@ function fxFindNextBatchBib($epr_id, $tabRanges, $mode, &$usedBib, $teamMode = 1
     return null;
 }
 
+/**
+ * MSIN-4433 — Vérifie en BD qu'un numéro est encore libre (assignation manuelle entre-temps).
+ */
+function fxBibIsNumberFreeInDb($epr_id, $intBib, $teamMode = 1) {
+    global $objDatabase;
+
+    $epr_id = (int)$epr_id;
+    $intBib = (int)$intBib;
+    $teamMode = (int)$teamMode;
+    $sqlBibNum = fxBibSqlNoBibUnsigned('no_bib');
+
+    if ($epr_id <= 0 || $intBib <= 0) {
+        return false;
+    }
+
+    if ($teamMode === 3) {
+        $sqlCheck = "
+            SELECT COUNT(DISTINCT pec_id)
+            FROM resultats_participants
+            WHERE epr_id = $epr_id
+              AND $sqlBibNum = $intBib
+              AND pec_id > 0
+        ";
+        return (int)$objDatabase->fxGetVar($sqlCheck) === 0;
+    }
+
+    $sqlCheck = "
+        SELECT COUNT(*)
+        FROM resultats_participants
+        WHERE epr_id = $epr_id
+          AND $sqlBibNum = $intBib
+    ";
+
+    return (int)$objDatabase->fxGetVar($sqlCheck) === 0;
+}
+
+/**
+ * MSIN-4433 — Prochain dossard libre pour un participant (1 UPDATE si execute).
+ * Relecture BD avant écriture : cohérence si changement manuel pendant le batch.
+ *
+ * @return int|null Numéro attribué, ou null si épuisé / participant déjà servi.
+ */
+function fxTryAssignNextBibForParticipant($epr_id, $par_id, $tabRanges, $mode, &$usedBib, $teamMode = 1) {
+    $epr_id = (int)$epr_id;
+    $par_id = (int)$par_id;
+    $teamMode = (int)$teamMode;
+    $intMaxAttempts = 50000;
+
+    for ($intAttempt = 0; $intAttempt < $intMaxAttempts; $intAttempt++) {
+        $candidate = fxFindNextBatchBib($epr_id, $tabRanges, $mode, $usedBib, $teamMode);
+
+        if ($candidate === null) {
+            return null;
+        }
+
+        if ($mode === 'execute') {
+            if (!fxBibIsNumberFreeInDb($epr_id, $candidate, $teamMode)) {
+                $usedBib[$candidate] = true;
+                continue;
+            }
+
+            $intAffected = fxApplyBatchParticipantBib($epr_id, $par_id, $candidate);
+
+            if ($intAffected <= 0) {
+                return null;
+            }
+
+            $usedBib[$candidate] = true;
+
+            return (int)$candidate;
+        }
+
+        return (int)$candidate;
+    }
+
+    return null;
+}
+
 /**
  * Écrit le no_bib d'un participant (batch GO).
  * Note : en mode « 1 équipe = 1 dossard », plusieurs lignes peuvent légitimement
@@ -5828,10 +5880,13 @@ function fxApplyBatchParticipantBib($epr_id, $par_id, $foundBib) {
     ";
 
     $objDatabase->fxQuery($sqlUpdate);
+    $intAffected = (int)$objDatabase->affected_rows;
 
-    if (function_exists('fxEvtErreurResoudre')) {
+    if ($intAffected > 0 && function_exists('fxEvtErreurResoudre')) {
         fxEvtErreurResoudre('bib_auto_miss', (int)$epr_id, (int)$par_id);
     }
+
+    return $intAffected;
 }
 
 function fxApplyBatchTeamNumber($epr_id, $teamKey, $teamNumber, &$updatedTeams) {
@@ -5868,6 +5923,35 @@ function fxGetBatchTeamKey($p) {
     return (int)($p['pec_id_original'] ?? $p['pec_id'] ?? 0);
 }
 
+/**
+ * MSIN-4433 — Mode équipe 3 : dossard déjà posé sur un coéquipier (batch par paquets).
+ */
+function fxGetExistingTeamBibInDb($epr_id, $teamKey) {
+    global $objDatabase;
+
+    $epr_id = (int)$epr_id;
+    $teamKey = (int)$teamKey;
+    $sqlBibNum = fxBibSqlNoBibUnsigned('no_bib');
+
+    if ($epr_id <= 0 || $teamKey <= 0) {
+        return null;
+    }
+
+    $sql = "
+        SELECT $sqlBibNum
+        FROM resultats_participants
+        WHERE epr_id = $epr_id
+          AND pec_id = $teamKey
+          AND is_cancelled = 0
+          AND $sqlBibNum > 0
+        LIMIT 1
+    ";
+
+    $bib = (int)$objDatabase->fxGetVar($sql);
+
+    return $bib > 0 ? $bib : null;
+}
+
 function fxCountBatchAssignUnits($epr_id, $participants = null) {
     global $objDatabase;
 
@@ -5951,19 +6035,23 @@ function fxCountBatchAssignUnits($epr_id, $participants = null) {
 
 function fxProcessBatchAssignmentsSolo($epr_id, $participants, $tabRanges, $mode = 'simulation') {
     $assignments = [];
-    $usedBib = ($mode === 'simulation') ? fxLoadUsedBibsForBatch($epr_id) : [];
+    // MSIN-4433 — état réel rechargé à chaque paquet (execute) ou simulation.
+    $usedBib = fxLoadUsedBibsForBatch($epr_id);
 
     foreach ($participants as $p) {
-        $foundBib = fxFindNextBatchBib($epr_id, $tabRanges, $mode, $usedBib);
+        $foundBib = fxTryAssignNextBibForParticipant(
+            $epr_id,
+            (int)$p['par_id'],
+            $tabRanges,
+            $mode,
+            $usedBib,
+            1
+        );
 
         if ($foundBib === null) {
             break;
         }
 
-        if ($mode === 'execute') {
-            fxApplyBatchParticipantBib($epr_id, (int)$p['par_id'], $foundBib);
-        }
-
         $assignments[] = fxBuildBatchAssignmentRow($p, $foundBib, 0);
     }
 
@@ -5971,16 +6059,12 @@ function fxProcessBatchAssignmentsSolo($epr_id, $participants, $tabRanges, $mode
 }
 
 function fxProcessBatchAssignmentsEquipe($epr_id, $participants, $tabRanges, $mode, $teamMode) {
-    global $objDatabase;
-
     $assignments = [];
     $teamMap = [];
     $updatedTeams = [];
-    // Mode 3 : mémorise le dossard déjà choisi pour chaque équipe (pec_id)
-    // → les coéquipiers réutilisent ce numéro sans repasser par fxFindNextBatchBib
     $teamBibMap = [];
     $nextTeamNumber = 1;
-    $usedBib = ($mode === 'simulation') ? fxLoadUsedBibsForBatch($epr_id) : [];
+    $usedBib = fxLoadUsedBibsForBatch($epr_id);
 
     foreach ($participants as $p) {
         $par_id = (int)$p['par_id'];
@@ -5988,37 +6072,60 @@ function fxProcessBatchAssignmentsEquipe($epr_id, $participants, $tabRanges, $mo
         $teamNumber = 0;
         $foundBib = null;
 
-        if ($teamMode === 3 && $teamKey > 0 && isset($teamBibMap[$teamKey])) {
-            // Coéquipier suivant : même dossard que le premier membre déjà traité
-            $foundBib = $teamBibMap[$teamKey];
+        if ($teamMode === 3 && $teamKey > 0) {
+            if (isset($teamBibMap[$teamKey])) {
+                $foundBib = $teamBibMap[$teamKey];
+            } else {
+                $foundBib = fxGetExistingTeamBibInDb($epr_id, $teamKey);
+                if ($foundBib !== null) {
+                    $teamBibMap[$teamKey] = $foundBib;
+                }
+            }
+        }
+
+        if ($teamMode === 3 && $teamKey > 0 && $foundBib !== null) {
             $teamNumber = $foundBib;
-        } elseif ($teamMode !== 3 && $teamKey > 0) {
-            // Mode dossards individuels : no_equipe séquentiel (1, 2, 3…) partagé par l'équipe
-            if (!isset($teamMap[$teamKey])) {
-                $teamMap[$teamKey] = $nextTeamNumber;
-                $nextTeamNumber++;
+
+            if ($mode === 'execute') {
+                $intAffected = fxApplyBatchParticipantBib($epr_id, $par_id, $foundBib);
+
+                if ($intAffected <= 0) {
+                    continue;
+                }
+
+                fxApplyBatchTeamNumber($epr_id, $teamKey, $teamNumber, $updatedTeams);
+            }
+        } else {
+            if ($teamMode !== 3 && $teamKey > 0) {
+                if (!isset($teamMap[$teamKey])) {
+                    $teamMap[$teamKey] = $nextTeamNumber;
+                    $nextTeamNumber++;
+                }
+
+                $teamNumber = $teamMap[$teamKey];
             }
 
-            $teamNumber = $teamMap[$teamKey];
-        }
+            $foundBib = fxTryAssignNextBibForParticipant(
+                $epr_id,
+                $par_id,
+                $tabRanges,
+                $mode,
+                $usedBib,
+                $teamMode
+            );
 
-        if ($foundBib === null) {
-            // Premier membre d'une équipe (mode 3) ou chaque participant (mode 1)
-            $foundBib = fxFindNextBatchBib($epr_id, $tabRanges, $mode, $usedBib, $teamMode);
-        }
+            if ($foundBib === null) {
+                break;
+            }
 
-        if ($foundBib === null) {
-            break;
-        }
+            if ($teamMode === 3 && $teamKey > 0) {
+                $teamBibMap[$teamKey] = $foundBib;
+                $teamNumber = $foundBib;
+            }
 
-        if ($teamMode === 3 && $teamKey > 0) {
-            $teamBibMap[$teamKey] = $foundBib;
-            $teamNumber = $foundBib;
-        }
-
-        if ($mode === 'execute') {
-            fxApplyBatchParticipantBib($epr_id, $par_id, $foundBib);
-            fxApplyBatchTeamNumber($epr_id, $teamKey, $teamNumber, $updatedTeams);
+            if ($mode === 'execute') {
+                fxApplyBatchTeamNumber($epr_id, $teamKey, $teamNumber, $updatedTeams);
+            }
         }
 
         $assignments[] = fxBuildBatchAssignmentRow($p, $foundBib, $teamNumber);
@@ -6057,6 +6164,46 @@ function fxProcessBatchAssignments($epr_id, $participants, $tabRanges, $mode = '
     return fxProcessBatchAssignmentsEquipe($epr_id, $participants, $tabRanges, $mode, $teamMode);
 }
 
+/** MSIN-4433 — Clé session pour accumuler les lignes assignées entre paquets AJAX. */
+function fxBibBatchExecSessionKey($epr_id) {
+    return 'bib_batch_exec_' . (int)$epr_id;
+}
+
+/**
+ * MSIN-4433 — HTML résultat GO batch (batch_apply et dernier paquet).
+ */
+function fxBibBuildBatchApplyHtml($epr_id, array $exec, $intTotalInitial, $strLangue) {
+    $assigned = count($exec);
+    $total = max($assigned, (int)$intTotalInitial);
+    $remaining = max(0, $total - $assigned);
+    $status = 'success';
+
+    if ($assigned === 0) {
+        $status = 'error';
+    } elseif ($assigned < $total) {
+        $status = 'partial';
+    }
+
+    if ($assigned === 0) {
+        $info = fxBibMsg('bib_v4_ajax_assign_none');
+    } elseif ($assigned >= $total) {
+        $info = fxBibMsg('bib_v4_ajax_assign_full', $assigned);
+    } else {
+        $info = fxBibMsg('bib_v4_ajax_assign_partial', $assigned, $remaining);
+    }
+
+    return renderBibView(
+        $epr_id,
+        0,
+        $strLangue,
+        'execute',
+        $exec,
+        fxBibTexte('bib_v4_ajax_title_assign'),
+        $info,
+        $status
+    );
+}
+
 function fxBuildBatchSummaryFromRanges($tabRangesInfos, $participants, $epr_id = 0) {
 
     $nbParticipants = fxCountBatchAssignUnits($epr_id, $participants);
diff --git a/php/inc_settings.php b/php/inc_settings.php
index 11691de..34350cd 100644
--- a/php/inc_settings.php
+++ b/php/inc_settings.php
@@ -7,7 +7,7 @@
  * Constantes *
  *
  **************/
-define('_VERSION_CODE', '4.72.732');
+define('_VERSION_CODE', '4.72.733');
 define('_DATE_CODE', '2026-07-07');
 //MSIN-4290
 define('QR_SECRET_KEY', 'ms1_qr_2026_cle_secrete_longue_et_fixe');
diff --git a/sql/MSIN-4433-bib-batch-chunk.sql b/sql/MSIN-4433-bib-batch-chunk.sql
new file mode 100644
index 0000000..67a0f4c
--- /dev/null
+++ b/sql/MSIN-4433-bib-batch-chunk.sql
@@ -0,0 +1,10 @@
+-- MSIN-4433 — GO batch par paquets : libellé progression overlay
+-- Idempotent. Exécuter après déploiement PHP/JS (ajax batch_apply_chunk).
+
+INSERT INTO info (info_clef, info_langue, info_texte, info_aide, info_prg, info_description, info_trie, info_actif, info_option1, info_option2, info_option3, info_creation)
+SELECT 'bib_v4_js_batch_progress', 'fr', 'Assignation des dossards… %d / %d', '', 'compte.php', '', 0, 1, '', '', '', NOW()
+FROM DUAL WHERE NOT EXISTS (SELECT 1 FROM info WHERE info_clef = 'bib_v4_js_batch_progress' AND info_langue = 'fr' AND info_prg = 'compte.php');
+
+INSERT INTO info (info_clef, info_langue, info_texte, info_aide, info_prg, info_description, info_trie, info_actif, info_option1, info_option2, info_option3, info_creation)
+SELECT 'bib_v4_js_batch_progress', 'en', 'Assigning bib numbers… %d / %d', '', 'compte.php', '', 0, 1, '', '', '', NOW()
+FROM DUAL WHERE NOT EXISTS (SELECT 1 FROM info WHERE info_clef = 'bib_v4_js_batch_progress' AND info_langue = 'en' AND info_prg = 'compte.php');