diff --git a/libs/ardour/disk_writer.cc b/libs/ardour/disk_writer.cc
index 86ee99e79f..befd043c71 100644
--- a/libs/ardour/disk_writer.cc
+++ b/libs/ardour/disk_writer.cc
@@ -1180,6 +1180,9 @@ DiskWriter::transport_stopped_wallclock (struct tm& when, time_t twhen, bool abo
 	uint32_t n = 0;
 	bool mark_write_completed = false;
 
+	/* finishing a capture will potentially create a lot of regions; we want them all assigned to the same region-group */
+	Region::RegionGroupRetainer rgr;
+
 	finish_capture (c);
 
 	/* butler is already stopped, but there may be work to do
diff --git a/libs/ardour/midi_playlist.cc b/libs/ardour/midi_playlist.cc
index f16e357c01..0fd984a9cd 100644
--- a/libs/ardour/midi_playlist.cc
+++ b/libs/ardour/midi_playlist.cc
@@ -233,6 +233,7 @@ MidiPlaylist::_split_region (std::shared_ptr<Region> region, timepos_t const & p
 		plist.add (Properties::length, after);
 		plist.add (Properties::name, after_name);
 		plist.add (Properties::right_of_split, true);
+		plist.add (Properties::reg_group, Region::get_retained_group_id());
 
 		/* same note as above */
 		right = RegionFactory::create (region, before, plist, true, &thawlist);
diff --git a/libs/ardour/playlist.cc b/libs/ardour/playlist.cc
index d29461a657..81a8b6efa3 100644
--- a/libs/ardour/playlist.cc
+++ b/libs/ardour/playlist.cc
@@ -1063,6 +1063,7 @@ Playlist::partition_internal (timepos_t const & start, timepos_t const & end, bo
 					plist.add (Properties::automatic, true);
 					plist.add (Properties::left_of_split, true);
 					plist.add (Properties::right_of_split, true);
+					plist.add (Properties::reg_group, Region::get_retained_group_id(true));
 
 					/* see note in ::_split_region()
 					 */
@@ -1082,6 +1083,7 @@ Playlist::partition_internal (timepos_t const & start, timepos_t const & end, bo
 				plist.add (Properties::name, new_name);
 				plist.add (Properties::automatic, true);
 				plist.add (Properties::right_of_split, true);
+				plist.add (Properties::reg_group, Region::get_retained_group_id());
 
 				region = RegionFactory::create (current, pos1.distance (pos3), plist, true, &thawlist );
 
@@ -1159,6 +1161,7 @@ Playlist::partition_internal (timepos_t const & start, timepos_t const & end, bo
 					plist.add (Properties::name, new_name);
 					plist.add (Properties::automatic, true);
 					plist.add (Properties::right_of_split, true);
+					plist.add (Properties::reg_group, Region::get_retained_group_id());
 
 					region = RegionFactory::create (current, plist, true, &thawlist);
 
@@ -1310,6 +1313,9 @@ Playlist::paste (std::shared_ptr<Playlist> other, timepos_t const & position, fl
 				for (auto const & r : other->regions) {
 					std::shared_ptr<Region> copy_of_region = RegionFactory::create (r, true, false, &rl1.thawlist);
 
+					/* we want newly-pasted regions to share one (implicit) group-id */
+					copy_of_region->set_region_group(false);
+
 					/* put these new regions on top of all existing ones, but preserve
 					   the ordering they had in the original playlist.
 					*/
@@ -1533,6 +1539,7 @@ Playlist::_split_region (std::shared_ptr<Region> region, timepos_t const &  play
 		plist.add (Properties::length, after);
 		plist.add (Properties::name, after_name);
 		plist.add (Properties::right_of_split, true);
+		plist.add (Properties::reg_group, Region::get_retained_group_id());
 
 		/* same note as above */
 		right = RegionFactory::create (region, before, plist, true, &thawlist);
diff --git a/libs/ardour/session_transport.cc b/libs/ardour/session_transport.cc
index 2a2c6408a5..580bfccaa4 100644
--- a/libs/ardour/session_transport.cc
+++ b/libs/ardour/session_transport.cc
@@ -1395,6 +1395,9 @@ Session::non_realtime_stop (bool abort, int on_entry, bool& finished, bool will_
 		_state_of_the_state = StateOfTheState (_state_of_the_state | InCleanup);
 	}
 
+	/* finishing a capture will potentially create a lot of regions; we want them all assigned to the same region-group */
+	Region::RegionGroupRetainer rgr;
+
 	for (auto const& i : *rl) {
 		std::shared_ptr<Track> tr = std::dynamic_pointer_cast<Track> (i);
 		if (tr) {
diff --git a/libs/ardour/track.cc b/libs/ardour/track.cc
index 06b9e58a3d..fcf7a2221b 100644
--- a/libs/ardour/track.cc
+++ b/libs/ardour/track.cc
@@ -962,6 +962,9 @@ Track::use_captured_midi_sources (SourceList& srcs, CaptureInfos const & capture
 		return;
 	}
 
+	/* all regions created from a recording pass should share the same group-id */
+	Region::RegionGroupRetainer rgr;
+
 	RecordMode rmode = _session.config.get_record_mode ();
 
 	samplecnt_t total_capture = 0;
@@ -1059,6 +1062,7 @@ Track::use_captured_midi_sources (SourceList& srcs, CaptureInfos const & capture
 			plist.add (Properties::length, l);
 			plist.add (Properties::opaque, rmode != RecSoundOnSound);
 			plist.add (Properties::name, region_name);
+			plist.add (Properties::reg_group, Region::get_retained_group_id());
 
 			std::shared_ptr<Region> rx (RegionFactory::create (srcs, plist));
 			midi_region = std::dynamic_pointer_cast<MidiRegion> (rx);
@@ -1163,6 +1167,7 @@ Track::use_captured_audio_sources (SourceList& srcs, CaptureInfos const & captur
 			plist.add (Properties::length, timecnt_t ((*ci)->samples, timepos_t::zero (false)));
 			plist.add (Properties::name, region_name);
 			plist.add (Properties::opaque, rmode != RecSoundOnSound);
+			plist.add (Properties::reg_group, Region::get_retained_group_id());
 
 			std::shared_ptr<Region> rx (RegionFactory::create (srcs, plist));
 			region = std::dynamic_pointer_cast<AudioRegion> (rx);