diff --git a/README.md b/README.md
index f9dcb47..35b63e0 100644
--- a/README.md
+++ b/README.md
@@ -227,8 +227,8 @@ analysis, optional [`SQANTI3`](https://github.com/conesalab/SQANTI3) QC, and opt
 When aligned BAMs contain modified base tags (`MM` and `ML`), the workflow also
 runs `modkit` on each sample alignment. It first checks which modified base
 codes are present in the BAM, then runs `modkit pileup` to produce a per-sample
-bedMethyl file and one bigWig track per requested or inferred modification
-under `samples/<alias>/mods/`.
+bedMethyl file, a simple per-sample summary table, and one bigWig track per
+requested or inferred modification under `samples/<alias>/mods/`.
 
 If `--mod_codes` is set, those codes are passed directly to `modkit pileup`.
 If it is omitted, the workflow infers the available `primary_base:mod_code`
@@ -378,6 +378,7 @@ Output files may be aggregated including information for all samples or provided
 | Aligned BAM index | samples/{{ alias }}/alignment/reads.bam.bai | Index for the aligned BAM. | per-sample |
 | Alignment summary | samples/{{ alias }}/alignment/bamstats.flagstat.tsv | bamstats flagstat summary for the aligned BAM. | per-sample |
 | Modified base pileup | samples/{{ alias }}/mods/{{ alias }}.mods.bedmethyl.gz | Per-sample modkit bedMethyl pileup generated from the aligned BAM when MM and ML tags are present. | per-sample |
+| Modified base summary | samples/{{ alias }}/mods/{{ alias }}.mods.summary.tsv | Per-sample global modification-percent summary aggregated from the modkit bedMethyl pileup, with one row per modification code. | per-sample |
 | Modified base bigWig | samples/{{ alias }}/mods/{{ alias }}.mods.*.bw | Per-sample modkit bigWig tracks generated from the aligned BAM, with one file per requested or inferred modification code. | per-sample |
 | Reference and annotation preparation summary | cohort/reference/annotation_reference_summary.json | Summary of reference and annotation preparation, including seqname overlap, build/provider hints, and excluded unstranded annotation counts. | aggregated |
 | Excluded unstranded annotation records | cohort/reference/unstranded_annotation.gtf | Full set of annotation records excluded because their strand was not '+' or '-'. Present only when unstranded records are found. | aggregated |
diff --git a/bin/workflow_glue/report.py b/bin/workflow_glue/report.py
index fe245e8..ebc20fb 100644
--- a/bin/workflow_glue/report.py
+++ b/bin/workflow_glue/report.py
@@ -1,5 +1,6 @@
 """Create workflow report for wf-transcriptomes."""
 
+from html import escape
 import json
 import math
 import os
@@ -23,6 +24,8 @@ from .hierarchical_clustering import hierarchical, clustering_info   # noqa: ABS
 from .util import get_named_logger, wf_parser  # noqa: ABS101
 from .volcano import volcano  # noqa: ABS101
 
+logger = get_named_logger("Report")
+
 
 # Suppress asyncio deprecation warning triggered by dominate on Python 3.10+.
 # dominate calls asyncio.get_event_loop() outside a running async context.
@@ -203,6 +206,168 @@ def _sqanti_table(sqanti_dir):
     return sqanti_df.sort_values(["_is_cohort", "Sample"]).drop(columns="_is_cohort")
 
 
+def _sample_mod_summaries(summary_dir):
+    """Return a combined modified base summary table across all samples."""
+    if not summary_dir:
+        return None
+    summaries_path = Path(summary_dir)
+    if not summaries_path.exists() or not summaries_path.is_dir():
+        return None
+    summaries = []
+    for summary_file in sorted(summaries_path.glob("*.mods.summary.tsv")):
+        if not summary_file.is_file():
+            continue
+        summary = _read_table(summary_file)
+        if summary is None or summary.empty:
+            continue
+        if "sample" not in summary.columns:
+            raise ValueError(
+                f"Modified base summary is missing required 'sample' column: "
+                f"{summary_file}"
+            )
+
+        sample_names = summary["sample"].unique()
+        if len(sample_names) != 1:
+            raise ValueError(
+                f"Modified base summary must contain exactly one sample name: "
+                f"{summary_file}"
+            )
+
+        summary["mod"] = summary["mod_label"].where(
+            summary["mod_label"] != "",
+            summary["full_mod_code"],
+        )
+        summary = summary[
+            [
+                "sample",
+                "mod",
+                "full_mod_code",
+                "modification_percent",
+                "modified_calls",
+                "valid_coverage",
+            ]
+        ]
+        summaries.append(summary)
+
+    if not summaries:
+        return None
+
+    summary = pd.concat(summaries, ignore_index=True)
+    return summary.sort_values(["mod", "sample"]).reset_index(drop=True)
+
+
+def _render_mod_summary_matrix(summary):
+    """Render modified base summaries as a cross-sample comparison matrix."""
+    if summary.duplicated(["sample", "mod"]).any():
+        raise ValueError(
+            "Modified base summary contains duplicate sample/mod combinations."
+        )
+
+    samples = sorted(summary["sample"].astype(str).unique())
+    mods = sorted(summary["mod"].astype(str).unique())
+    lookup = {
+        (str(row.sample), str(row.mod)): row
+        for row in summary.itertuples(index=False)
+    }
+
+    header_html = "".join(
+        f"<th>{escape(mod)}</th>" for mod in mods
+    )
+    body_rows = []
+    for sample in samples:
+        cells = []
+        for mod in mods:
+            row = lookup.get((sample, mod))
+            if row is None:
+                cells.append(
+                    "<td class='mod-summary-cell mod-summary-empty'>"
+                    "<div class='mod-summary-empty-mark'>&mdash;</div>"
+                    "</td>"
+                )
+                continue
+            cells.append(
+                "<td class='mod-summary-cell'>"
+                f"<div class='mod-summary-percent'>"
+                f"{_format_mod_summary_percent(row.modification_percent)}%"
+                f"</div>"
+                f"<div class='mod-summary-meta'>"
+                f"{_format_mod_summary_count(row.modified_calls)} modified"
+                f"</div>"
+                f"<div class='mod-summary-meta'>"
+                f"{_format_mod_summary_count(row.valid_coverage)} valid"
+                f"</div>"
+                "</td>"
+            )
+        body_rows.append(
+            "<tr>"
+            f"<th class='mod-summary-sample'>{escape(sample)}</th>"
+            + "".join(cells)
+            + "</tr>"
+        )
+
+    return (
+        "<div class='mod-summary-matrix-wrap'>"
+        "<table class='mod-summary-matrix'>"
+        "<thead><tr><th>Sample</th>"
+        f"{header_html}</tr></thead>"
+        f"<tbody>{''.join(body_rows)}</tbody>"
+        "</table>"
+        "</div>"
+    )
+
+
+def _format_mod_summary_percent(value):
+    """Format a modified base percentage for display."""
+    return f"{float(value):.2f}"
+
+
+def _format_mod_summary_count(value):
+    """Format a modified base count for display."""
+    return format(int(round(float(value))), ",")
+
+
+def _mod_summary_matrix_style():
+    """Return CSS for the modified base summary comparison matrix."""
+    return """
+    .mod-summary-matrix-wrap { overflow-x: auto; margin-bottom: 0.75rem; }
+    .mod-summary-matrix { width: 100%; border-collapse: collapse; }
+    .mod-summary-matrix th,
+    .mod-summary-matrix td {
+        border-bottom: 1px solid #e5e7eb;
+        padding: 0.75rem 0.875rem;
+        vertical-align: top;
+        text-align: left;
+    }
+    .mod-summary-matrix thead th {
+        font-weight: 600;
+        white-space: nowrap;
+    }
+    .mod-summary-sample {
+        white-space: nowrap;
+        font-weight: 600;
+    }
+    .mod-summary-percent {
+        font-size: 1.05rem;
+        font-weight: 700;
+        line-height: 1.2;
+    }
+    .mod-summary-meta {
+        margin-top: 0.15rem;
+        font-size: 0.8rem;
+        color: #6b7280;
+        line-height: 1.25;
+        white-space: nowrap;
+    }
+    .mod-summary-empty {
+        color: #9ca3af;
+    }
+    .mod-summary-empty-mark {
+        font-size: 1rem;
+        line-height: 1.2;
+    }
+    """
+
+
 def _contrast_results(de_dir, filename, n=None):
     """Return a dict of per-contrast result DataFrames read from filename."""
     tables = {}
@@ -490,6 +655,23 @@ def main(args):
                     .rename(columns={"index": "Field"}),
                     use_index=False,
                 )
+    mod_summaries = _sample_mod_summaries(args.mod_summary_dir)
+    if mod_summaries is not None and not mod_summaries.empty:
+        with report.add_section("Modified base summaries", "Modifications"):
+            dom_style(raw(_mod_summary_matrix_style()))
+            raw(_render_mod_summary_matrix(mod_summaries))
+            small(raw(
+                "<b>Valid coverage</b> Sum of the valid residues: all the "
+                "modified, canonical and other mod (where the modification "
+                "is different from the listed base) bedMethyl columns "
+                "counts for this combination of sample and mod. "
+                "<b>Modified calls</b> Number of calls passing filters "
+                "that were classified as a residue with a specified base "
+                "modification. "
+                "<b>Modification percent</b> (Modified calls / Valid "
+                "coverage) * 100"
+            ))
+
     annotation_reference_summary = _load_annotation_reference_summary(args.ref_summary)
 
     if annotation_reference_summary:
@@ -1233,6 +1415,11 @@ def argparser():
         required=True,
         help="Per-sample output directory.",
     )
+    parser.add_argument(
+        "--mod_summary_dir",
+        default=None,
+        help="Modified base summary directory.",
+    )
     parser.add_argument(
         "--sqanti_dir",
         required=True,
diff --git a/bin/workflow_glue/summarise_modkit_bedmethyl.py b/bin/workflow_glue/summarise_modkit_bedmethyl.py
new file mode 100644
index 0000000..e735b74
--- /dev/null
+++ b/bin/workflow_glue/summarise_modkit_bedmethyl.py
@@ -0,0 +1,145 @@
+#!/usr/bin/env python
+"""Summarise per-sample modkit bedMethyl outputs."""
+
+from collections import defaultdict
+import csv
+import gzip
+
+from .util import wf_parser  # noqa: ABS101
+
+
+SUMMARY_FIELDS = (
+    "sample",
+    "full_mod_code",
+    "mod_code",
+    "mod_label",
+    "valid_coverage",
+    "modified_calls",
+    "canonical_calls",
+    "other_calls",
+    "delete_calls",
+    "fail_calls",
+    "diff_calls",
+    "nocall_calls",
+    "modification_percent",
+)
+
+
+def load_mod_code_labels(label_tsv):
+    """Load friendly labels keyed by full mod code."""
+    labels = {}
+    with open(label_tsv, newline="", encoding="utf-8") as handle:
+        reader = csv.DictReader(handle, delimiter="\t")
+        for row in reader:
+            mod_code = row.get("mod_code", "").strip()
+            label = row.get("label", "").strip()
+            if mod_code and label:
+                labels[mod_code] = label
+    return labels
+
+
+def open_text_maybe_gzip(path):
+    """Open plain text or gzipped text files transparently."""
+    if str(path).endswith(".gz"):
+        return gzip.open(path, "rt", encoding="utf-8")
+    return open(path, encoding="utf-8")
+
+
+def build_full_code_lookup(mod_codes):
+    """Map stripped mod codes back to their full primary_base:mod_code form."""
+    lookup = {}
+    for full_code in mod_codes.split(","):
+        full_code = full_code.strip()
+        if not full_code:
+            continue
+        if ":" in full_code:
+            _, mod_code = full_code.split(":", 1)
+        else:
+            mod_code = full_code
+        lookup[mod_code] = full_code
+    return lookup
+
+
+def summarise_bedmethyl(bedmethyl, sample, mod_codes, labels):
+    """Aggregate a bedMethyl file into one row per modification code."""
+    full_code_lookup = build_full_code_lookup(mod_codes)
+    counts = defaultdict(
+        lambda: {
+            "valid_coverage": 0,
+            "modified_calls": 0,
+            "canonical_calls": 0,
+            "other_calls": 0,
+            "delete_calls": 0,
+            "fail_calls": 0,
+            "diff_calls": 0,
+            "nocall_calls": 0,
+        }
+    )
+
+    # TODO would be nice to tidy this up as an ezcharts component
+    with open_text_maybe_gzip(bedmethyl) as handle:
+        for line in handle:
+            if not line.strip() or line.startswith("#"):
+                continue
+            fields = line.rstrip("\n").split("\t")
+            mod_code = fields[3]
+            stats = counts[mod_code]
+            stats["valid_coverage"] += int(fields[9])
+            stats["modified_calls"] += int(fields[11])
+            stats["canonical_calls"] += int(fields[12])
+            stats["other_calls"] += int(fields[13])
+            stats["delete_calls"] += int(fields[14])
+            stats["fail_calls"] += int(fields[15])
+            stats["diff_calls"] += int(fields[16])
+            stats["nocall_calls"] += int(fields[17])
+
+    rows = []
+    for mod_code, stats in sorted(counts.items()):
+        full_mod_code = full_code_lookup.get(mod_code, mod_code)
+        valid_coverage = stats["valid_coverage"]
+        modification_percent = (
+            (stats["modified_calls"] / valid_coverage) * 100
+            if valid_coverage else 0.0
+        )
+        rows.append(
+            {
+                "sample": sample,
+                "full_mod_code": full_mod_code,
+                "mod_code": mod_code,
+                "mod_label": labels.get(full_mod_code, mod_code),
+                **stats,
+                "modification_percent": f"{modification_percent:.2f}",
+            }
+        )
+    return rows
+
+
+def write_summary(rows, output):
+    """Write summary rows to a TSV file."""
+    with open(output, "w", newline="", encoding="utf-8") as handle:
+        writer = csv.DictWriter(handle, fieldnames=SUMMARY_FIELDS, delimiter="\t")
+        writer.writeheader()
+        writer.writerows(rows)
+
+
+def main(args):
+    """Run the entry point."""
+    labels = load_mod_code_labels(args.mod_code_labels)
+    rows = summarise_bedmethyl(
+        args.bedmethyl,
+        args.sample,
+        args.mod_codes,
+        labels,
+    )
+    write_summary(rows, args.output)
+
+
+def argparser():
+    """Argument parser for entrypoint."""
+    parser = wf_parser("summarise_modkit_bedmethyl")
+    parser.add_argument("bedmethyl", help="Input modkit bedMethyl file")
+    parser.add_argument("sample", help="Sample alias")
+    parser.add_argument("mod_codes", help="Comma-separated full modification codes")
+    parser.add_argument("mod_code_labels", help="TSV mapping full mod codes to labels")
+    parser.add_argument("output", help="Output TSV")
+    return parser
diff --git a/bin/workflow_glue/tests/common/test_report.py b/bin/workflow_glue/tests/common/test_report.py
index 77a5e76..9f38742 100644
--- a/bin/workflow_glue/tests/common/test_report.py
+++ b/bin/workflow_glue/tests/common/test_report.py
@@ -106,6 +106,8 @@ def _build_report_args(tmp_path, de_qc=None):
 
     samples = tmp_path / "samples"
     samples.mkdir()
+    mod_summaries = tmp_path / "mod_summaries"
+    mod_summaries.mkdir()
     sqanti = tmp_path / "sqanti"
     sqanti.mkdir()
     alignment_stats = tmp_path / "alignment_stats"
@@ -149,6 +151,8 @@ def _build_report_args(tmp_path, de_qc=None):
         str(reference / "annotation_reference_summary.json"),
         "--samples_dir",
         str(samples),
+        "--mod_summary_dir",
+        str(mod_summaries),
         "--sqanti_dir",
         str(sqanti),
         "--versions",
@@ -213,6 +217,10 @@ def test_report_main_accepts_optional_file_sentinels(monkeypatch, tmp_path):
     samples.mkdir()
     (samples / "OPTIONAL_FILE").touch()
 
+    mod_summaries = tmp_path / "mod_summaries"
+    mod_summaries.mkdir()
+    (mod_summaries / "OPTIONAL_FILE").touch()
+
     sqanti = tmp_path / "sqanti"
     sqanti.mkdir()
     (sqanti / "OPTIONAL_FILE").touch()
@@ -235,6 +243,8 @@ def test_report_main_accepts_optional_file_sentinels(monkeypatch, tmp_path):
             str(cohort / "reference" / "annotation_reference_summary.json"),
             "--samples_dir",
             str(samples),
+            "--mod_summary_dir",
+            str(mod_summaries),
             "--sqanti_dir",
             str(sqanti),
             "--versions",
@@ -254,6 +264,64 @@ def test_report_main_accepts_optional_file_sentinels(monkeypatch, tmp_path):
     assert any("GRCh38" in table.to_string() for table in tables)
 
 
+def test_report_main_renders_modified_base_summary_tables(monkeypatch, tmp_path):
+    """Per-sample modified base summaries should render as report tables."""
+    tables = []
+    raw_calls = []
+
+    monkeypatch.setattr(report.labs, "LabsReport", _FakeReport)
+    monkeypatch.setattr(report, "Tabs", _FakeTabs)
+    monkeypatch.setattr(report, "p", lambda *args, **kwargs: None)
+    monkeypatch.setattr(report, "pre", lambda *args, **kwargs: None)
+    monkeypatch.setattr(report, "raw", lambda value: raw_calls.append(value) or value)
+    monkeypatch.setattr(report, "_create_warning_banner", lambda *args, **kwargs: None)
+    monkeypatch.setattr(report.fastcat, "SeqSummary", lambda *args, **kwargs: None)
+    monkeypatch.setattr(
+        report.DataTable,
+        "from_pandas",
+        staticmethod(lambda table, *args, **kwargs: tables.append(table.copy())),
+    )
+
+    args, out_report = _build_report_args(tmp_path)
+    mod_summaries = tmp_path / "mod_summaries"
+    _write(
+        mod_summaries / "not_the_sample_name.mods.summary.tsv",
+        (
+            "sample\tfull_mod_code\tmod_code\tmod_label\tvalid_coverage\t"
+            "modified_calls\tcanonical_calls\tother_calls\tdelete_calls\t"
+            "fail_calls\tdiff_calls\tnocall_calls\tmodification_percent\n"
+            "sampleA\tA:a\ta\tm6A\t12\t6\t6\t0\t0\t3\t0\t0\t50.00\n"
+        ),
+    )
+    _write(
+        mod_summaries / "sampleB.mods.summary.tsv",
+        (
+            "sample\tfull_mod_code\tmod_code\tmod_label\tvalid_coverage\t"
+            "modified_calls\tcanonical_calls\tother_calls\tdelete_calls\t"
+            "fail_calls\tdiff_calls\tnocall_calls\tmodification_percent\n"
+            "sampleB\tC:m\tm\tm5C\t20\t5\t15\t0\t0\t0\t0\t0\t25.00\n"
+        ),
+    )
+
+    report.main(args)
+
+    assert out_report.exists()
+    matrix_html = next(
+        value for value in raw_calls
+        if "<table class='mod-summary-matrix'>" in value
+    )
+    assert "sampleA" in matrix_html
+    assert "sampleB" in matrix_html
+    assert "m6A" in matrix_html
+    assert "m5C" in matrix_html
+    assert "50.00%" in matrix_html
+    assert "25.00%" in matrix_html
+    assert "6 modified" in matrix_html
+    assert "12 valid" in matrix_html
+    assert "5 modified" in matrix_html
+    assert "20 valid" in matrix_html
+
+
 def test_report_main_handles_degenerate_bambu_qc_and_read_summary(
     monkeypatch,
     tmp_path,
diff --git a/bin/workflow_glue/tests/common/test_summarise_modkit_bedmethyl.py b/bin/workflow_glue/tests/common/test_summarise_modkit_bedmethyl.py
new file mode 100644
index 0000000..6747e14
--- /dev/null
+++ b/bin/workflow_glue/tests/common/test_summarise_modkit_bedmethyl.py
@@ -0,0 +1,102 @@
+"""Tests for modkit bedMethyl summarisation."""
+
+import gzip
+
+from workflow_glue import summarise_modkit_bedmethyl
+
+
+def _write(path, text):
+    path.write_text(text, encoding="utf-8")
+    return path
+
+
+def test_summarise_bedmethyl_aggregates_per_mod_code(tmp_path):
+    """Rows should be summed into one row per modification code."""
+    label_tsv = _write(
+        tmp_path / "mod_code_labels.tsv",
+        "mod_code\tlabel\nA:a\tm6A\nT:17802\tpseU\n",
+    )
+    bedmethyl = _write(
+        tmp_path / "sample.mods.bedmethyl",
+        (
+            "chr1\t10\t11\ta\t1\t+\t10\t11\t255,0,0\t5\t40.00\t2\t3\t0\t0\t1\t0\t0\n"
+            "chr1\t11\t12\ta\t1\t+\t11\t12\t255,0,0\t7\t57.14\t4\t3\t0\t0\t2\t0\t0\n"
+            "chr1\t20\t21\t17802\t1\t+\t20\t21\t255,0,0\t4\t25.00\t1\t3\t0\t0\t0\t0\t"
+            "0\n"
+        ),
+    )
+
+    rows = summarise_modkit_bedmethyl.summarise_bedmethyl(
+        bedmethyl,
+        "sample1",
+        "A:a,T:17802",
+        summarise_modkit_bedmethyl.load_mod_code_labels(label_tsv),
+    )
+
+    assert rows == [
+        {
+            "sample": "sample1",
+            "full_mod_code": "T:17802",
+            "mod_code": "17802",
+            "mod_label": "pseU",
+            "valid_coverage": 4,
+            "modified_calls": 1,
+            "canonical_calls": 3,
+            "other_calls": 0,
+            "delete_calls": 0,
+            "fail_calls": 0,
+            "diff_calls": 0,
+            "nocall_calls": 0,
+            "modification_percent": "25.00",
+        },
+        {
+            "sample": "sample1",
+            "full_mod_code": "A:a",
+            "mod_code": "a",
+            "mod_label": "m6A",
+            "valid_coverage": 12,
+            "modified_calls": 6,
+            "canonical_calls": 6,
+            "other_calls": 0,
+            "delete_calls": 0,
+            "fail_calls": 3,
+            "diff_calls": 0,
+            "nocall_calls": 0,
+            "modification_percent": "50.00",
+        },
+    ]
+
+
+def test_summarise_bedmethyl_reads_gzipped_input(tmp_path):
+    """The helper should aggregate multiple rows from gzipped bedMethyl input."""
+    bedmethyl = tmp_path / "sample.mods.bedmethyl.gz"
+    with gzip.open(bedmethyl, "wt", encoding="utf-8") as handle:
+        handle.write(
+            "chr1\t10\t11\ta\t1\t+\t10\t11\t255,0,0\t5\t40.00\t2\t3\t0\t0\t1\t0\t0\n"
+            "chr1\t11\t12\ta\t1\t+\t11\t12\t255,0,0\t7\t57.14\t4\t3\t0\t0\t2\t0\t0\n"
+        )
+
+    rows = summarise_modkit_bedmethyl.summarise_bedmethyl(
+        bedmethyl,
+        "sample1",
+        "A:a",
+        {"A:a": "m6A"},
+    )
+
+    assert rows == [
+        {
+            "sample": "sample1",
+            "full_mod_code": "A:a",
+            "mod_code": "a",
+            "mod_label": "m6A",
+            "valid_coverage": 12,
+            "modified_calls": 6,
+            "canonical_calls": 6,
+            "other_calls": 0,
+            "delete_calls": 0,
+            "fail_calls": 3,
+            "diff_calls": 0,
+            "nocall_calls": 0,
+            "modification_percent": "50.00",
+        }
+    ]
diff --git a/docs/06_pipeline_overview.md b/docs/06_pipeline_overview.md
index be1b4cb..9803ece 100644
--- a/docs/06_pipeline_overview.md
+++ b/docs/06_pipeline_overview.md
@@ -72,8 +72,8 @@ analysis, optional [`SQANTI3`](https://github.com/conesalab/SQANTI3) QC, and opt
 When aligned BAMs contain modified base tags (`MM` and `ML`), the workflow also
 runs `modkit` on each sample alignment. It first checks which modified base
 codes are present in the BAM, then runs `modkit pileup` to produce a per-sample
-bedMethyl file and one bigWig track per requested or inferred modification
-under `samples/<alias>/mods/`.
+bedMethyl file, a simple per-sample summary table, and one bigWig track per
+requested or inferred modification under `samples/<alias>/mods/`.
 
 If `--mod_codes` is set, those codes are passed directly to `modkit pileup`.
 If it is omitted, the workflow infers the available `primary_base:mod_code`
diff --git a/docs/08_outputs.md b/docs/08_outputs.md
index a0f6e1b..943edff 100644
--- a/docs/08_outputs.md
+++ b/docs/08_outputs.md
@@ -7,6 +7,7 @@ Output files may be aggregated including information for all samples or provided
 | Aligned BAM index | samples/{{ alias }}/alignment/reads.bam.bai | Index for the aligned BAM. | per-sample |
 | Alignment summary | samples/{{ alias }}/alignment/bamstats.flagstat.tsv | bamstats flagstat summary for the aligned BAM. | per-sample |
 | Modified base pileup | samples/{{ alias }}/mods/{{ alias }}.mods.bedmethyl.gz | Per-sample modkit bedMethyl pileup generated from the aligned BAM when MM and ML tags are present. | per-sample |
+| Modified base summary | samples/{{ alias }}/mods/{{ alias }}.mods.summary.tsv | Per-sample global modification-percent summary aggregated from the modkit bedMethyl pileup, with one row per modification code. | per-sample |
 | Modified base bigWig | samples/{{ alias }}/mods/{{ alias }}.mods.*.bw | Per-sample modkit bigWig tracks generated from the aligned BAM, with one file per requested or inferred modification code. | per-sample |
 | Reference and annotation preparation summary | cohort/reference/annotation_reference_summary.json | Summary of reference and annotation preparation, including seqname overlap, build/provider hints, and excluded unstranded annotation counts. | aggregated |
 | Excluded unstranded annotation records | cohort/reference/unstranded_annotation.gtf | Full set of annotation records excluded because their strand was not '+' or '-'. Present only when unstranded records are found. | aggregated |
diff --git a/main.nf b/main.nf
index 91cd914..d808e89 100644
--- a/main.nf
+++ b/main.nf
@@ -43,6 +43,7 @@ process makeReport {
         path "params.json"
         path cohort_dir, stageAs: "cohort"
         path sample_dirs, stageAs: "samples/*"
+        path mod_summary_files, stageAs: "mod_summaries/*"
         path sqanti_dirs, stageAs: "sqanti/*"
         path de_files
         path "annotation_reference_summary.tsv"
@@ -62,6 +63,7 @@ process makeReport {
         ${stats_args} \
         --cohort_dir cohort \
         --samples_dir samples \
+        --mod_summary_dir mod_summaries \
         --sqanti_dir sqanti \
         ${de_args} \
         --versions versions \
@@ -132,6 +134,11 @@ workflow wf {
             .map { meta, sample_dir -> sample_dir }
             .collect()
 
+        mod_summaries_for_report = mod_results.summary
+            .map { alias, summary -> summary }
+            .ifEmpty(OPTIONAL_FILE)
+            .collect()
+
         sqanti_dirs_for_report = transcriptome_results.joint_sqanti_dir
             .concat(transcriptome_results.sample_sqanti_dirs.map { meta, sqanti_dir -> sqanti_dir })
             .ifEmpty(OPTIONAL_FILE)
@@ -155,6 +162,7 @@ workflow wf {
             workflow_params,
             transcriptome_results.joint_dir.ifEmpty(OPTIONAL_FILE),
             sample_dirs_for_report,
+            mod_summaries_for_report,
             sqanti_dirs_for_report,
             de_dir,
             transcriptome_results.annotation_reference_summary,
diff --git a/output_definition.json b/output_definition.json
index 2eeb5c2..147808a 100644
--- a/output_definition.json
+++ b/output_definition.json
@@ -40,6 +40,14 @@
       "optional": true,
       "type": "per-sample"
     },
+    "sample-mod-summary": {
+      "filepath": "samples/{{ alias }}/mods/{{ alias }}.mods.summary.tsv",
+      "title": "Modified base summary",
+      "description": "Per-sample global modification-percent summary aggregated from the modkit bedMethyl pileup, with one row per modification code.",
+      "mime-type": "text/tab-separated-values",
+      "optional": true,
+      "type": "per-sample"
+    },
     "sample-mod-bigwig": {
       "filepath": "samples/{{ alias }}/mods/{{ alias }}.mods.*.bw",
       "title": "Modified base bigWig",
diff --git a/subworkflows/mods.nf b/subworkflows/mods.nf
index d7fbcda..547c276 100644
--- a/subworkflows/mods.nf
+++ b/subworkflows/mods.nf
@@ -99,6 +99,33 @@ process modkit_tobigwig {
     """
 }
 
+process summariseModkitBedmethyl {
+    label "wf_common"
+    cpus 1
+    memory "2 GB"
+    input:
+        tuple val(alias),
+            path(bedmethyl),
+            val(mod_codes)
+        path mod_code_labels
+    output:
+        tuple val(alias),
+            path("${alias}.mods.summary.tsv"),
+            emit: summary
+    publishDir "${params.out_dir}/${output_key}/mods"
+
+    script:
+    output_key = alias == "cohort" ? "cohort" : "samples/${alias}"  // nodef
+    """
+    workflow-glue summarise_modkit_bedmethyl \
+        "${bedmethyl}" \
+        "${alias}" \
+        "${mod_codes}" \
+        "${mod_code_labels}" \
+        "${alias}.mods.summary.tsv"
+    """
+}
+
 process inferModkitBases {
     label "modkit"
     cpus 1
@@ -153,6 +180,10 @@ workflow mods {
         mod_samples = xams_with.mods.join(sample_modcodes)
 
         pileup = runModkitPileup(mod_samples, ref_genome)
+        sample_summaries = summariseModkitBedmethyl(
+            pileup.bedmethyl.join(sample_modcodes),
+            file("$projectDir/data/mod_code_labels.tsv")
+        )
 
         sample_bigwigs = modkit_tobigwig(
             ref_genome,
@@ -162,5 +193,6 @@ workflow mods {
 
     emit:
         bedmethyl = pileup.bedmethyl
+        summary = sample_summaries.summary
         bigwig = sample_bigwigs.bigwig
 }