diff --git a/packages/core/src/config.ts b/packages/core/src/config.ts
index fcfc34fb..94b6e14d 100644
--- a/packages/core/src/config.ts
+++ b/packages/core/src/config.ts
@@ -20,7 +20,7 @@ import fs, { existsSync, readFileSync } from 'fs';
 import { getSsmParameter, SsmParameterReadError } from './ssm';
 import { hexToBase58 } from './solana';
 import { isTvmChain } from './tron';
-import { getRebalanceConfigFromS3 } from './s3';
+import { getRebalanceConfigFromS3, getThresholdRebalanceConfigFromS3 } from './s3';
 import { stitchConfig, loadManifest, setValueByPath } from './shard';
 
 config();
@@ -205,75 +205,110 @@ interface TokenRebalanceDefaults {
   maxAmount?: string;
 }
 
+/**
+ * Convert empty strings to undefined so they don't short-circuit ?? fallback chains.
+ * Fee-admin S3 export should already convert empty strings to null, but this
+ * provides a defensive layer in mark to prevent empty string overrides.
+ */
+const nonEmpty = (value: string | undefined | null): string | undefined =>
+  value === '' || value === null ? undefined : value;
+
 async function loadTokenRebalanceConfig(
+  s3Config: TokenRebalanceConfig | undefined,
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   configJson: Record<string, any>,
   configKey: string,
   envPrefix: string,
   defaults?: TokenRebalanceDefaults,
 ): Promise<TokenRebalanceConfig> {
+  // Priority: S3 (fee-admin) > configJson (SSM) > env vars > defaults
+  const s3 = s3Config;
   const cfg = configJson[configKey];
   return {
-    enabled: parseBooleanValue(cfg?.enabled) ?? parseBooleanValue(await fromEnv(`${envPrefix}_ENABLED`, true)) ?? false,
+    enabled:
+      s3?.enabled ??
+      parseBooleanValue(cfg?.enabled) ??
+      parseBooleanValue(await fromEnv(`${envPrefix}_ENABLED`, true)) ??
+      false,
     marketMaker: {
-      address: cfg?.marketMaker?.address ?? (await fromEnv(`${envPrefix}_MARKET_MAKER_ADDRESS`, true)) ?? undefined,
+      address:
+        nonEmpty(s3?.marketMaker?.address) ??
+        cfg?.marketMaker?.address ??
+        (await fromEnv(`${envPrefix}_MARKET_MAKER_ADDRESS`, true)) ??
+        undefined,
       onDemandEnabled:
+        s3?.marketMaker?.onDemandEnabled ??
         parseBooleanValue(cfg?.marketMaker?.onDemandEnabled) ??
         parseBooleanValue(await fromEnv(`${envPrefix}_MARKET_MAKER_ON_DEMAND_ENABLED`, true)) ??
         false,
       thresholdEnabled:
+        s3?.marketMaker?.thresholdEnabled ??
         parseBooleanValue(cfg?.marketMaker?.thresholdEnabled) ??
         parseBooleanValue(await fromEnv(`${envPrefix}_MARKET_MAKER_THRESHOLD_ENABLED`, true)) ??
         false,
       threshold:
+        nonEmpty(s3?.marketMaker?.threshold) ??
         cfg?.marketMaker?.threshold ??
         (await fromEnv(`${envPrefix}_MARKET_MAKER_THRESHOLD`, true)) ??
         defaults?.mmThreshold ??
         undefined,
       targetBalance:
+        nonEmpty(s3?.marketMaker?.targetBalance) ??
         cfg?.marketMaker?.targetBalance ??
         (await fromEnv(`${envPrefix}_MARKET_MAKER_TARGET_BALANCE`, true)) ??
         defaults?.mmTarget ??
         undefined,
     },
     fillService: {
-      address: cfg?.fillService?.address ?? (await fromEnv(`${envPrefix}_FILL_SERVICE_ADDRESS`, true)) ?? undefined,
+      address:
+        nonEmpty(s3?.fillService?.address) ??
+        cfg?.fillService?.address ??
+        (await fromEnv(`${envPrefix}_FILL_SERVICE_ADDRESS`, true)) ??
+        undefined,
       senderAddress:
+        nonEmpty(s3?.fillService?.senderAddress) ??
         cfg?.fillService?.senderAddress ??
         (await fromEnv(`${envPrefix}_FILL_SERVICE_SENDER_ADDRESS`, true)) ??
         undefined,
       thresholdEnabled:
+        s3?.fillService?.thresholdEnabled ??
         parseBooleanValue(cfg?.fillService?.thresholdEnabled) ??
         parseBooleanValue(await fromEnv(`${envPrefix}_FILL_SERVICE_THRESHOLD_ENABLED`, true)) ??
         false,
       threshold:
+        nonEmpty(s3?.fillService?.threshold) ??
         cfg?.fillService?.threshold ??
         (await fromEnv(`${envPrefix}_FILL_SERVICE_THRESHOLD`, true)) ??
         defaults?.fsThreshold ??
         undefined,
       targetBalance:
+        nonEmpty(s3?.fillService?.targetBalance) ??
         cfg?.fillService?.targetBalance ??
         (await fromEnv(`${envPrefix}_FILL_SERVICE_TARGET_BALANCE`, true)) ??
         defaults?.fsTarget ??
         undefined,
       allowCrossWalletRebalancing:
+        s3?.fillService?.allowCrossWalletRebalancing ??
         parseBooleanValue(cfg?.fillService?.allowCrossWalletRebalancing) ??
         parseBooleanValue(await fromEnv(`${envPrefix}_FILL_SERVICE_ALLOW_CROSS_WALLET`, true)) ??
         false,
     },
     bridge: {
       slippageDbps:
+        s3?.bridge?.slippageDbps ??
         cfg?.bridge?.slippageDbps ??
         parseInt(
           (await fromEnv(`${envPrefix}_BRIDGE_SLIPPAGE_DBPS`, true)) ?? String(defaults?.slippageDbps ?? 500),
           10,
         ),
       minRebalanceAmount:
+        nonEmpty(s3?.bridge?.minRebalanceAmount) ??
         cfg?.bridge?.minRebalanceAmount ??
         (await fromEnv(`${envPrefix}_BRIDGE_MIN_REBALANCE_AMOUNT`, true)) ??
         defaults?.minAmount ??
         '100000000', // Safe default: 100 units (6-decimal tokens like USDC/USDT)
       maxRebalanceAmount:
+        nonEmpty(s3?.bridge?.maxRebalanceAmount) ??
         cfg?.bridge?.maxRebalanceAmount ??
         (await fromEnv(`${envPrefix}_BRIDGE_MAX_REBALANCE_AMOUNT`, true)) ??
         defaults?.maxAmount ??
@@ -474,41 +509,71 @@ export async function loadConfiguration(): Promise<MarkConfiguration> {
         privateKey: configJson.solana?.privateKey ?? (await fromEnv('SOLANA_PRIVATE_KEY', true)) ?? undefined,
         rpcUrl: configJson.solana?.rpcUrl ?? (await fromEnv('SOLANA_RPC_URL', true)) ?? undefined,
       },
-      tacRebalance: await loadTokenRebalanceConfig(configJson, 'tacRebalance', 'TAC_REBALANCE'),
-      methRebalance: await loadTokenRebalanceConfig(configJson, 'methRebalance', 'METH_REBALANCE'),
-      aManUsdeRebalance: await loadTokenRebalanceConfig(configJson, 'aManUsdeRebalance', 'AMANUSDE_REBALANCE'),
-      aMansyrupUsdtRebalance: await loadTokenRebalanceConfig(
-        configJson,
-        'aMansyrupUsdtRebalance',
-        'AMANSYRUPUSDT_REBALANCE',
-      ),
-      solanaPtusdeRebalance: {
-        enabled:
-          parseBooleanValue(configJson.solanaPtusdeRebalance?.enabled) ??
-          parseBooleanValue(await fromEnv('SOLANA_PTUSDE_REBALANCE_ENABLED', true)) ??
-          false,
-        ptUsdeThreshold:
-          configJson.solanaPtusdeRebalance?.ptUsdeThreshold ??
-          (await fromEnv('SOLANA_PTUSDE_REBALANCE_THRESHOLD', true)) ??
-          '100000000000', // 100 ptUSDe (9 decimals on Solana)
-        ptUsdeTarget:
-          configJson.solanaPtusdeRebalance?.ptUsdeTarget ??
-          (await fromEnv('SOLANA_PTUSDE_REBALANCE_TARGET', true)) ??
-          '500000000000', // 500 ptUSDe (9 decimals on Solana)
-        bridge: {
-          slippageDbps:
-            configJson.solanaPtusdeRebalance?.bridge?.slippageDbps ??
-            parseInt((await fromEnv('SOLANA_PTUSDE_REBALANCE_BRIDGE_SLIPPAGE_DBPS', true)) ?? '50', 10), // 0.5% default
-          minRebalanceAmount:
-            configJson.solanaPtusdeRebalance?.bridge?.minRebalanceAmount ??
-            (await fromEnv('SOLANA_PTUSDE_REBALANCE_BRIDGE_MIN_REBALANCE_AMOUNT', true)) ??
-            '1000000', // 1 USDC minimum (6 decimals)
-          maxRebalanceAmount:
-            configJson.solanaPtusdeRebalance?.bridge?.maxRebalanceAmount ??
-            (await fromEnv('SOLANA_PTUSDE_REBALANCE_BRIDGE_MAX_REBALANCE_AMOUNT', true)) ??
-            '100000000', // 100 USDC max (6 decimals)
-        },
-      },
+      // Fetch threshold configs from S3 (fee-admin) - highest priority source
+      // Falls back gracefully to SSM/env if S3 is unavailable or empty
+      ...(await (async () => {
+        const thresholdS3 = await getThresholdRebalanceConfigFromS3();
+        const solanaS3 = thresholdS3?.solanaPtusdeRebalance;
+        return {
+          tacRebalance: await loadTokenRebalanceConfig(
+            thresholdS3?.tacRebalance,
+            configJson,
+            'tacRebalance',
+            'TAC_REBALANCE',
+          ),
+          methRebalance: await loadTokenRebalanceConfig(
+            thresholdS3?.methRebalance,
+            configJson,
+            'methRebalance',
+            'METH_REBALANCE',
+          ),
+          aManUsdeRebalance: await loadTokenRebalanceConfig(
+            thresholdS3?.aManUsdeRebalance,
+            configJson,
+            'aManUsdeRebalance',
+            'AMANUSDE_REBALANCE',
+          ),
+          aMansyrupUsdtRebalance: await loadTokenRebalanceConfig(
+            thresholdS3?.aMansyrupUsdtRebalance,
+            configJson,
+            'aMansyrupUsdtRebalance',
+            'AMANSYRUPUSDT_REBALANCE',
+          ),
+          solanaPtusdeRebalance: {
+            enabled:
+              solanaS3?.enabled ??
+              parseBooleanValue(configJson.solanaPtusdeRebalance?.enabled) ??
+              parseBooleanValue(await fromEnv('SOLANA_PTUSDE_REBALANCE_ENABLED', true)) ??
+              false,
+            ptUsdeThreshold:
+              nonEmpty(solanaS3?.ptUsdeThreshold) ??
+              configJson.solanaPtusdeRebalance?.ptUsdeThreshold ??
+              (await fromEnv('SOLANA_PTUSDE_REBALANCE_THRESHOLD', true)) ??
+              '100000000000', // 100 ptUSDe (9 decimals on Solana)
+            ptUsdeTarget:
+              nonEmpty(solanaS3?.ptUsdeTarget) ??
+              configJson.solanaPtusdeRebalance?.ptUsdeTarget ??
+              (await fromEnv('SOLANA_PTUSDE_REBALANCE_TARGET', true)) ??
+              '500000000000', // 500 ptUSDe (9 decimals on Solana)
+            bridge: {
+              slippageDbps:
+                solanaS3?.bridge?.slippageDbps ??
+                configJson.solanaPtusdeRebalance?.bridge?.slippageDbps ??
+                parseInt((await fromEnv('SOLANA_PTUSDE_REBALANCE_BRIDGE_SLIPPAGE_DBPS', true)) ?? '50', 10), // 0.5% default
+              minRebalanceAmount:
+                nonEmpty(solanaS3?.bridge?.minRebalanceAmount) ??
+                configJson.solanaPtusdeRebalance?.bridge?.minRebalanceAmount ??
+                (await fromEnv('SOLANA_PTUSDE_REBALANCE_BRIDGE_MIN_REBALANCE_AMOUNT', true)) ??
+                '1000000', // 1 USDC minimum (6 decimals)
+              maxRebalanceAmount:
+                nonEmpty(solanaS3?.bridge?.maxRebalanceAmount) ??
+                configJson.solanaPtusdeRebalance?.bridge?.maxRebalanceAmount ??
+                (await fromEnv('SOLANA_PTUSDE_REBALANCE_BRIDGE_MAX_REBALANCE_AMOUNT', true)) ??
+                '100000000', // 100 USDC max (6 decimals)
+            },
+          },
+        };
+      })()),
       redis: configJson.redis ?? {
         host: await requireEnv('REDIS_HOST'),
         port: parseInt(await requireEnv('REDIS_PORT')),
@@ -543,6 +608,7 @@ export async function loadConfiguration(): Promise<MarkConfiguration> {
     };
 
     validateConfiguration(config);
+    logThresholdRebalancerConfigs(config);
     return config;
   } catch (_error: unknown) {
     const error = _error as Error;
@@ -550,6 +616,57 @@ export async function loadConfiguration(): Promise<MarkConfiguration> {
   }
 }
 
+/**
+ * Log loaded threshold rebalancer configs at startup.
+ * Only logs non-secret operational parameters: addresses, thresholds,
+ * targets, slippage, and amounts. No private keys, mnemonics, or API keys.
+ */
+function logThresholdRebalancerConfigs(config: MarkConfiguration): void {
+  const logTokenRebalancer = (name: string, cfg: TokenRebalanceConfig) => {
+    console.log(`[ThresholdConfig] ${name}:`, {
+      enabled: cfg.enabled,
+      marketMaker: {
+        address: cfg.marketMaker.address,
+        onDemandEnabled: cfg.marketMaker.onDemandEnabled,
+        thresholdEnabled: cfg.marketMaker.thresholdEnabled,
+        threshold: cfg.marketMaker.threshold,
+        targetBalance: cfg.marketMaker.targetBalance,
+      },
+      fillService: {
+        address: cfg.fillService.address,
+        senderAddress: cfg.fillService.senderAddress,
+        thresholdEnabled: cfg.fillService.thresholdEnabled,
+        threshold: cfg.fillService.threshold,
+        targetBalance: cfg.fillService.targetBalance,
+        allowCrossWalletRebalancing: cfg.fillService.allowCrossWalletRebalancing,
+      },
+      bridge: {
+        slippageDbps: cfg.bridge.slippageDbps,
+        minRebalanceAmount: cfg.bridge.minRebalanceAmount,
+        maxRebalanceAmount: cfg.bridge.maxRebalanceAmount,
+      },
+    });
+  };
+
+  if (config.tacRebalance) logTokenRebalancer('tacRebalance', config.tacRebalance);
+  if (config.methRebalance) logTokenRebalancer('methRebalance', config.methRebalance);
+  if (config.aManUsdeRebalance) logTokenRebalancer('aManUsdeRebalance', config.aManUsdeRebalance);
+  if (config.aMansyrupUsdtRebalance) logTokenRebalancer('aMansyrupUsdtRebalance', config.aMansyrupUsdtRebalance);
+
+  if (config.solanaPtusdeRebalance) {
+    console.log('[ThresholdConfig] solanaPtusdeRebalance:', {
+      enabled: config.solanaPtusdeRebalance.enabled,
+      ptUsdeThreshold: config.solanaPtusdeRebalance.ptUsdeThreshold,
+      ptUsdeTarget: config.solanaPtusdeRebalance.ptUsdeTarget,
+      bridge: {
+        slippageDbps: config.solanaPtusdeRebalance.bridge.slippageDbps,
+        minRebalanceAmount: config.solanaPtusdeRebalance.bridge.minRebalanceAmount,
+        maxRebalanceAmount: config.solanaPtusdeRebalance.bridge.maxRebalanceAmount,
+      },
+    });
+  }
+}
+
 function validateConfiguration(config: MarkConfiguration): void {
   if (!config.web3SignerUrl) {
     throw new ConfigurationError('Signer address is required');
diff --git a/packages/core/src/s3.ts b/packages/core/src/s3.ts
index 8672a3a3..1eeac0bf 100644
--- a/packages/core/src/s3.ts
+++ b/packages/core/src/s3.ts
@@ -1,5 +1,5 @@
 import { S3Client, GetObjectCommand } from '@aws-sdk/client-s3';
-import { RebalanceConfig } from './types/config';
+import { RebalanceConfig, ThresholdRebalanceS3Config } from './types/config';
 
 // Singleton client to prevent race conditions
 let s3Client: S3Client | null = null;
@@ -80,3 +80,54 @@ export const getRebalanceConfigFromS3 = async (): Promise<RebalanceConfig | null
     return null;
   }
 };
+
+/**
+ * Fetch threshold-based rebalancer configs from S3.
+ * These are exported by fee-admin as threshold-rebalance-config.json.
+ * Uses the same S3 bucket as regular rebalance config.
+ *
+ * Priority chain: S3 (fee-admin) > SSM/configJson > env vars
+ */
+export const getThresholdRebalanceConfigFromS3 = async (): Promise<ThresholdRebalanceS3Config | null> => {
+  try {
+    const bucket = process.env.REBALANCE_CONFIG_S3_BUCKET;
+    const key = process.env.THRESHOLD_REBALANCE_CONFIG_S3_KEY || 'threshold-rebalance-config.json';
+    const region = process.env.REBALANCE_CONFIG_S3_REGION;
+
+    if (!bucket) {
+      return null;
+    }
+
+    const client = getS3Client(region);
+    if (!client) {
+      return null;
+    }
+
+    const command = new GetObjectCommand({
+      Bucket: bucket,
+      Key: key,
+    });
+
+    const response = await client.send(command);
+
+    if (!response.Body) {
+      return null;
+    }
+
+    const bodyString = await response.Body.transformToString();
+    const config = JSON.parse(bodyString) as ThresholdRebalanceS3Config;
+
+    const configKeys = Object.keys(config);
+    console.log('Successfully loaded threshold rebalance config from S3', {
+      bucket,
+      key,
+      configKeys,
+      configCount: configKeys.length,
+    });
+
+    return config;
+  } catch (error) {
+    console.warn('Failed to fetch threshold rebalance config from S3:', error instanceof Error ? error.message : error);
+    return null;
+  }
+};
diff --git a/packages/core/src/types/config.ts b/packages/core/src/types/config.ts
index 7f56c46a..f171db9f 100644
--- a/packages/core/src/types/config.ts
+++ b/packages/core/src/types/config.ts
@@ -197,6 +197,19 @@ export const TOKEN_REBALANCER_KEYS: TokenRebalancerKey[] = [
   'aMansyrupUsdtRebalance',
 ];
 
+/**
+ * S3 threshold rebalance config shape exported by fee-admin.
+ * Each key maps to its corresponding TokenRebalanceConfig or SolanaRebalanceConfig.
+ * Loaded from threshold-rebalance-config.json in the solver's S3 bucket.
+ */
+export interface ThresholdRebalanceS3Config {
+  tacRebalance?: TokenRebalanceConfig;
+  methRebalance?: TokenRebalanceConfig;
+  aManUsdeRebalance?: TokenRebalanceConfig;
+  aMansyrupUsdtRebalance?: TokenRebalanceConfig;
+  solanaPtusdeRebalance?: SolanaRebalanceConfig;
+}
+
 export interface RedisConfig {
   host: string;
   port: number;