diff --git a/daml/dars.lock b/daml/dars.lock
index a639c0ca9a..611b4aef7e 100644
--- a/daml/dars.lock
+++ b/daml/dars.lock
@@ -71,6 +71,7 @@ splice-dso-governance 0.1.24 4974c654485d4ecaa6b5caf8ef3c2679efa8195c4b50d4965a8
 splice-dso-governance 0.1.25 b41ffa8aadafc8ae78eeb39b201eca9bc96470267d36553badd5df2a0587b16f
 splice-dso-governance 0.1.26 d65173dabe1b5e7278ffb66c55defb123f72df18218c7e317bcc4f703f08a84e
 splice-dso-governance 0.1.27 ab73d34dddab433044f560603f2822e5b26d9af98bd6ea8a0e9a25c5f717ab9a
+splice-dso-governance 0.1.28 f70766cc94255f385f0c6e12c7635ef1adfeecde30de873db646db5a2cf8e94b
 splice-dso-governance 0.1.3 b0ae3cc03e418790305a3c15f761fe495572de5827f8d322fb8b96996b783c13
 splice-dso-governance 0.1.4 dc24fd18b4d151cd1e0ff6bfb7438bafb2f50fe076d0f16f50565e60b153a0be
 splice-dso-governance 0.1.5 9e3ca1d22ad495dfabf3d61acae3dc1a7718f527f02092280b58cf69edfdc84c
@@ -78,7 +79,7 @@ splice-dso-governance 0.1.6 4e7653cfbf7ca249de4507aca9cd3b91060e5489042a522c589d
 splice-dso-governance 0.1.7 d406eba1132d464605f4dae3edf8cf5ecbbb34bd8edef0e047e7e526d328718c
 splice-dso-governance 0.1.8 1790a114f83d5f290261fae1e7e46fba75a861a3dd603c6b4ef6b67b49053948
 splice-dso-governance 0.1.9 9ee83bfd872f91e659b8a8439c5b4eaf240bcf6f19698f884d7d7993ab48c401
-splice-dso-governance-test 0.1.33 bb97b29d63309dad1c7d9af45a5f425e4fae18ddc83f5c20755e21f4d21bcd26
+splice-dso-governance-test 0.1.34 0ba60677a1ce30ffb2ff86e89485bad6925c0541d5e6977f791bff403464b2da
 splice-token-standard-test 1.0.13 a556574314ab5ecbfa04b04a6b6c9259cf90388461fe307ba712257ad5993a6b
 splice-token-test-dummy-holding 0.0.1 1cd171c6c42ab46dc9cf12d80c6111369e00cea5cdf054924b4f26ce94b1ef5b
 splice-token-test-dummy-holding 0.0.2 4f40fb033ef3db89623642c1b494e846097fa32af138b3864a63aa15937a323d
diff --git a/daml/dars/splice-dso-governance-0.1.28.dar b/daml/dars/splice-dso-governance-0.1.28.dar
new file mode 100644
index 0000000000..6420f8ab53
Binary files /dev/null and b/daml/dars/splice-dso-governance-0.1.28.dar differ
diff --git a/daml/splice-dso-governance-test/daml.yaml b/daml/splice-dso-governance-test/daml.yaml
index 2babc8a99a..7b40dabed3 100644
--- a/daml/splice-dso-governance-test/daml.yaml
+++ b/daml/splice-dso-governance-test/daml.yaml
@@ -1,7 +1,7 @@
 sdk-version: 3.4.11
 name: splice-dso-governance-test
 source: daml
-version: 0.1.33
+version: 0.1.34
 dependencies:
   - daml-prim
   - daml-stdlib
diff --git a/daml/splice-dso-governance-test/daml/Splice/Scripts/TestGovernance.daml b/daml/splice-dso-governance-test/daml/Splice/Scripts/TestGovernance.daml
index cabb7c45c3..a43520b682 100644
--- a/daml/splice-dso-governance-test/daml/Splice/Scripts/TestGovernance.daml
+++ b/daml/splice-dso-governance-test/daml/Splice/Scripts/TestGovernance.daml
@@ -85,6 +85,128 @@ testSvGovernanceVoterBindingLifecycle = do
   None <- queryContractId dso rotateResult.bindingCid
   pure ()
 
+-- | Tests governance-voter casting while preserving represented-SV vote slots.
+testGovernanceVoterCastPath : Script ()
+testGovernanceVoterCastPath = do
+  (_app, dso, (sv1, sv2, _sv3, _sv4)) <- initMainNet
+  governanceVoter1 <- allocateParty "cast-governance-voter-1"
+  governanceVoter2 <- allocateParty "cast-governance-voter-2"
+  wrongVoter <- allocateParty "wrong-cast-governance-voter"
+  newSv <- allocateParty "cast-new-sv"
+
+  [(dsoRulesCid, _)] <- query @DsoRules dso
+  [(_, openRound), _, _] <- sortOn (._2.round) <$> query @OpenMiningRound dso
+  bindingCid <- submit sv1 $ createCmd SvGovernanceVoter with
+    dso
+    sv = sv1
+    governanceVoter = governanceVoter1
+
+  let governanceVote signer accept body = Vote with
+        sv = sv1
+        castBy = signer
+        castByRole = VCR_GovernanceVoter
+        accept
+        reason = Reason with url = ""; body
+        optCastAt = None
+  let operatorVote accept body = Vote with
+        sv = sv1
+        castBy = sv1
+        castByRole = VCR_Operator
+        accept
+        reason = Reason with url = ""; body
+        optCastAt = None
+  let requestOffboardSv = submit (actAs sv1 <> readAs dso) $ exerciseCmd dsoRulesCid DsoRules_RequestVote with
+        requester = sv1
+        action = ARC_DsoRules with
+          dsoAction = SRARC_OffboardSv DsoRules_OffboardSv with sv = sv2
+        reason = Reason with url = ""; body = "cast path"
+        targetEffectiveAt = None
+        voteRequestTimeout = Some (days 7)
+
+  requestResult <- requestOffboardSv
+  passTime (minutes 1)
+  castResult <- submit (actAs governanceVoter1 <> readAs dso) $ exerciseCmd dsoRulesCid DsoRules_CastGovernanceVote with
+    requestCid = requestResult.voteRequest
+    bindingCid
+    vote = governanceVote governanceVoter1 False "governance voter update"
+  Some request <- queryContractId dso castResult.voteRequest
+  Map.size request.votes === 1
+  case Map.lookup request.requester request.votes of
+    None -> fail "represented SV vote missing"
+    Some vote -> do
+      vote.sv === sv1
+      vote.castBy === governanceVoter1
+      vote.castByRole === VCR_GovernanceVoter
+      vote.accept === False
+
+  passTime (minutes 1)
+  operatorResult <- submit (actAs sv1 <> readAs dso) $ exerciseCmd dsoRulesCid DsoRules_CastVote with
+    requestCid = castResult.voteRequest
+    vote = operatorVote True "operator overwrite"
+  Some request <- queryContractId dso operatorResult.voteRequest
+  case Map.lookup request.requester request.votes of
+    None -> fail "operator vote missing"
+    Some vote -> do
+      vote.castBy === sv1
+      vote.castByRole === VCR_Operator
+      vote.accept === True
+
+  passTime (minutes 1)
+  castResult <- submit (actAs governanceVoter1 <> readAs dso) $ exerciseCmd dsoRulesCid DsoRules_CastGovernanceVote with
+    requestCid = operatorResult.voteRequest
+    bindingCid
+    vote = governanceVote governanceVoter1 False "governance voter overwrite"
+  Some request <- queryContractId dso castResult.voteRequest
+  case Map.lookup request.requester request.votes of
+    None -> fail "governance-voter vote missing"
+    Some vote -> do
+      vote.castBy === governanceVoter1
+      vote.castByRole === VCR_GovernanceVoter
+      vote.accept === False
+
+  unsupportedRequest <- submit (actAs sv1 <> readAs dso) $ exerciseCmd dsoRulesCid DsoRules_RequestVote with
+    requester = sv1
+    action = ARC_DsoRules with
+      dsoAction = SRARC_AddSv DsoRules_AddSv with
+        newSvParty = newSv
+        newSvName = "cast-new-sv"
+        newSvRewardWeight = 1
+        newSvParticipantId = "cast-new-sv-participant"
+        joinedAsOfRound = openRound.round
+    reason = Reason with url = ""; body = "unsupported action"
+    targetEffectiveAt = None
+    voteRequestTimeout = Some (days 7)
+  submitMustFail (actAs governanceVoter1 <> readAs dso) $ exerciseCmd dsoRulesCid DsoRules_CastGovernanceVote with
+    requestCid = unsupportedRequest.voteRequest
+    bindingCid
+    vote = governanceVote governanceVoter1 False "unsupported"
+
+  wrongVoterRequest <- requestOffboardSv
+  submitMustFail (actAs wrongVoter <> readAs dso) $ exerciseCmd dsoRulesCid DsoRules_CastGovernanceVote with
+    requestCid = wrongVoterRequest.voteRequest
+    bindingCid
+    vote = governanceVote wrongVoter False "wrong voter"
+
+  rotateResult <- submit sv1 $ exerciseCmd bindingCid RotateGovernanceVoter with
+    newGovernanceVoter = governanceVoter2
+  rotatedRequest <- requestOffboardSv
+  submitMustFail (actAs governanceVoter1 <> readAs dso) $ exerciseCmd dsoRulesCid DsoRules_CastGovernanceVote with
+    requestCid = rotatedRequest.voteRequest
+    bindingCid = rotateResult.bindingCid
+    vote = governanceVote governanceVoter1 False "rotated old voter"
+  passTime (minutes 1)
+  _ <- submit (actAs governanceVoter2 <> readAs dso) $ exerciseCmd dsoRulesCid DsoRules_CastGovernanceVote with
+    requestCid = rotatedRequest.voteRequest
+    bindingCid = rotateResult.bindingCid
+    vote = governanceVote governanceVoter2 False "rotated new voter"
+
+  _ <- submit sv1 $ exerciseCmd rotateResult.bindingCid ClearGovernanceVoter
+  clearedRequest <- requestOffboardSv
+  submitMustFail (actAs governanceVoter2 <> readAs dso) $ exerciseCmd dsoRulesCid DsoRules_CastGovernanceVote with
+    requestCid = clearedRequest.voteRequest
+    bindingCid = rotateResult.bindingCid
+    vote = governanceVote governanceVoter2 False "cleared binding"
+
 -- | Tests the Phase 1 governance-voter action taxonomy.
 testGovernanceVoterActionTaxonomy : Script ()
 testGovernanceVoterActionTaxonomy = do
diff --git a/daml/splice-dso-governance/daml.yaml b/daml/splice-dso-governance/daml.yaml
index cf92914f32..02f6682cb8 100644
--- a/daml/splice-dso-governance/daml.yaml
+++ b/daml/splice-dso-governance/daml.yaml
@@ -1,7 +1,7 @@
 sdk-version: 3.4.11
 name: splice-dso-governance
 source: daml
-version: 0.1.27
+version: 0.1.28
 dependencies:
   - daml-prim
   - daml-stdlib
diff --git a/daml/splice-dso-governance/daml/Splice/DsoRules.daml b/daml/splice-dso-governance/daml/Splice/DsoRules.daml
index 4cedc722c9..8335d8a5f6 100644
--- a/daml/splice-dso-governance/daml/Splice/DsoRules.daml
+++ b/daml/splice-dso-governance/daml/Splice/DsoRules.daml
@@ -32,6 +32,7 @@ import Splice.Ans
 import Splice.SvOnboarding
 import Splice.DSO.AmuletPrice
 import Splice.DSO.DecentralizedSynchronizer
+import Splice.DSO.GovernanceVoter
 import Splice.DSO.SvState
 import Splice.Schedule
 import Splice.Util
@@ -209,6 +210,9 @@ data DsoRules_RequestVoteResult = DsoRules_RequestVoteResult with
 data DsoRules_CastVoteResult = DsoRules_CastVoteResult with
     voteRequest : ContractId VoteRequest
 
+data DsoRules_CastGovernanceVoteResult = DsoRules_CastGovernanceVoteResult with
+    voteRequest : ContractId VoteRequest
+
 data DsoRules_UpdateAmuletPriceVoteResult = DsoRules_UpdateAmuletPriceVoteResult with
     amuletPriceVote : ContractId AmuletPriceVote
 
@@ -820,6 +824,44 @@ template DsoRules with
           trackingCid = Some (fromOptional requestCid request.trackingCid)
         return DsoRules_CastVoteResult with ..
 
+    -- Note that this choice can be used to both cast the initial governance-voter
+    -- vote, and update a vote for the represented SV.
+    nonconsuming choice DsoRules_CastGovernanceVote : DsoRules_CastGovernanceVoteResult
+      with
+        requestCid : ContractId VoteRequest
+        bindingCid : ContractId SvGovernanceVoter
+        vote : Vote
+      controller vote.castBy
+      do
+        -- validate vote parameters
+        requireWellformedVote config vote
+        binding <- fetch bindingCid
+        require "Binding dso must match rules dso" (binding.dso == dso)
+        require "Vote SV must match binding SV" (vote.sv == binding.sv)
+        require "Vote signer must match binding governance voter" (vote.castBy == binding.governanceVoter)
+        require "Vote signer role must be governance voter" (vote.castByRole == VCR_GovernanceVoter)
+        voterName <- case Map.lookup binding.sv svs of
+          None -> fail "Voter is not an SV"
+          Some info -> pure info.name
+        -- validate and archive request
+        request <- fetchAndArchive (ForDso with dso) requestCid
+        require "Action is not governance-voter eligible" (isGovernanceVoterAction request.action)
+        -- rate limit casting of votes by the same represented SV to avoid blocking progress
+        enforceCooldown ("voteCooldownTime for " <> partyToText binding.sv) (getVoteCooldownTime config) $ do
+          pastVote <- Map.lookup voterName request.votes
+          pastVote.optCastAt
+        -- store vote in the represented SV's vote slot
+        now <- getTime
+        let recordedVote = vote with
+              sv = binding.sv
+              castBy = binding.governanceVoter
+              castByRole = VCR_GovernanceVoter
+              optCastAt = Some now
+        voteRequest <- create request with
+          votes = Map.insert voterName recordedVote request.votes
+          trackingCid = Some (fromOptional requestCid request.trackingCid)
+        return DsoRules_CastGovernanceVoteResult with ..
+
     -- We expect the TxHistory log of the SV app to store the choice argument together
     -- with its result for historical reference.
     --
diff --git a/docs/src/sv_operator/sv_governance_voter.rst b/docs/src/sv_operator/sv_governance_voter.rst
index c6c1f88604..66f53fd979 100644
--- a/docs/src/sv_operator/sv_governance_voter.rst
+++ b/docs/src/sv_operator/sv_governance_voter.rst
@@ -25,6 +25,10 @@ keeps that invariant outside the template key space so reviewers can decide
 whether workflow validation is sufficient or whether a separate registry pattern
 is needed before an upstream design is finalized.
 
+Governance-voter vote submission fetches the binding by contract ID, validates
+the signer against the binding, checks the action allowlist, and writes the vote
+into the represented SV's vote slot.
+
 The first contract slice uses a hardcoded Daml allowlist for governance-voter
 eligible actions. New ``ActionRequiringConfirmation`` constructors are rejected
 by default until reviewed and added deliberately. The proposed allowlist is