diff --git a/src/components/menus/Modal.tsx b/src/components/menus/Modal.tsx
index bc7b225..746ab5e 100644
--- a/src/components/menus/Modal.tsx
+++ b/src/components/menus/Modal.tsx
@@ -56,7 +56,7 @@ export function Modal({
               <Dialog.Panel
                 className={`w-full ${
                   width || 'max-w-xs'
-                } max-h-[90vh] transform overflow-auto rounded-2xl bg-white ${
+                } max-h-[90vh] transform overflow-auto bg-white ${
                   padding || 'px-4 py-4'
                 } text-left shadow-lg transition-all`}
               >
@@ -73,6 +73,8 @@ export function Modal({
                       onClick={close}
                       title="Close"
                       className="hover:rotate-90"
+                      width={20}
+                      height={20}
                     />
                   </div>
                 )}
diff --git a/src/features/account/hooks.ts b/src/features/account/hooks.ts
index 13bc133..6791eac 100644
--- a/src/features/account/hooks.ts
+++ b/src/features/account/hooks.ts
@@ -32,7 +32,7 @@ export function useLockedBalance(address?: Address) {
         decimals: CELO.decimals,
         formatted: formatUnits(data, CELO.decimals),
         symbol: CELO.symbol,
-        value: data,
+        value: BigInt(data),
       }
     : undefined;
 
diff --git a/src/features/staking/StakeForm.tsx b/src/features/staking/StakeForm.tsx
index 5a0a542..1fad032 100644
--- a/src/features/staking/StakeForm.tsx
+++ b/src/features/staking/StakeForm.tsx
@@ -1,12 +1,17 @@
-import { Form, Formik } from 'formik';
+import { Form, Formik, useField, useFormikContext } from 'formik';
+import { useEffect, useMemo } from 'react';
 import { OutlineButton } from 'src/components/buttons/OutlineButton';
+import { SolidButton } from 'src/components/buttons/SolidButton';
 import { NumberField } from 'src/components/input/NumberField';
 import { formatNumberString } from 'src/components/numbers/Amount';
 import { ZERO_ADDRESS } from 'src/config/consts';
 import { useLockedBalance } from 'src/features/account/hooks';
 import { useStakingBalances } from 'src/features/staking/useStakingBalances';
+import { ValidatorGroup } from 'src/features/validators/types';
 import { useValidatorGroups } from 'src/features/validators/useValidatorGroups';
+import { fromWeiRounded } from 'src/utils/amount';
 import { logger } from 'src/utils/logger';
+import { bigIntMax } from 'src/utils/math';
 import { useAccount } from 'wagmi';
 
 interface StakeFormValues {
@@ -19,51 +24,104 @@ const initialValues: StakeFormValues = {
   group: ZERO_ADDRESS,
 };
 
-export function StakeForm() {
+export function StakeForm({ defaultGroup }: { defaultGroup?: Address }) {
   const { address } = useAccount();
   const { groups } = useValidatorGroups();
   const { lockedBalance } = useLockedBalance(address);
-  const { stakes } = useStakingBalances(address);
+  const { stakeBalances } = useStakingBalances(address);
+
+  const availableLockedWei = bigIntMax(
+    (lockedBalance?.value || 0n) - (stakeBalances?.total || 0n),
+    0n,
+  );
 
   const onSubmit = (values: StakeFormValues) => {
     alert(values);
-    logger.debug(groups);
-    logger.debug(stakes);
   };
 
   const validate = (values: StakeFormValues) => {
     alert(values);
   };
 
+  return (
+    <Formik<StakeFormValues>
+      initialValues={{
+        ...initialValues,
+        group: defaultGroup || initialValues.group,
+      }}
+      onSubmit={onSubmit}
+      validate={validate}
+      validateOnChange={false}
+      validateOnBlur={false}
+    >
+      <Form className="mt-2 flex w-full flex-col items-stretch space-y-4">
+        <h2 className="font-serif text-2xl">Stake with a validator</h2>
+        <AmountField availableLockedWei={availableLockedWei} />
+        <GroupField groups={groups} defaultGroup={defaultGroup} />
+        <SolidButton type="submit">Stake</SolidButton>
+      </Form>
+    </Formik>
+  );
+}
+
+function AmountField({ availableLockedWei }: { availableLockedWei: bigint }) {
+  const { setFieldValue } = useFormikContext();
+
+  const availableLocked = useMemo(() => fromWeiRounded(availableLockedWei), [availableLockedWei]);
+
+  const onClickMax = async () => {
+    await setFieldValue('amount', availableLocked);
+  };
+
+  return (
+    <div>
+      <div className="flex items-center justify-between">
+        <label htmlFor="amount" className="pl-0.5 text-sm">
+          Amount
+        </label>
+        <span className="text-xs">
+          {`${formatNumberString(availableLocked, 2)} Locked CELO available`}
+        </span>
+      </div>
+      <div className="relative mt-2">
+        <NumberField name="amount" className="w-full all:py-3" />
+        <div className="absolute right-1 top-2 z-10">
+          <OutlineButton onClick={onClickMax} type="button">
+            Max
+          </OutlineButton>
+        </div>
+      </div>
+    </div>
+  );
+}
+
+function GroupField({
+  groups,
+  defaultGroup,
+}: {
+  groups?: ValidatorGroup[];
+  defaultGroup?: Address;
+}) {
+  const [field, , helpers] = useField<Address>('group');
+
+  useEffect(() => {
+    helpers.setValue(defaultGroup || ZERO_ADDRESS).catch((e) => logger.error(e));
+  }, [defaultGroup, helpers]);
+
   return (
     <div>
-      <h2>Stake with a validator</h2>
-      <Formik<StakeFormValues>
-        initialValues={initialValues}
-        onSubmit={onSubmit}
-        validate={validate}
-        validateOnChange={false}
-        validateOnBlur={false}
-      >
-        <Form className="mt-2 flex w-full flex-col items-stretch">
-          <div>
-            <div className="flex justify-between pr-1">
-              <label htmlFor="amount" className="pl-0.5 text-sm">
-                Amount
-              </label>
-              <span className="text-xs">
-                {`${formatNumberString(lockedBalance?.value, 2)} Locked CELO available`}
-              </span>
-            </div>
-            <div className="relative">
-              <NumberField name="amount" />
-              <div className="absolute right-0 top-1/3 z-10">
-                <OutlineButton onClick={() => alert('TODO')}>Max</OutlineButton>
-              </div>
-            </div>
-          </div>
-        </Form>
-      </Formik>
+      <label htmlFor="group" className="pl-0.5 text-sm">
+        Group
+      </label>
+      <div>
+        <select name="group" className="w-full" value={field.value}>
+          {(groups || []).map((group) => (
+            <option key={group.address} value={group.address}>
+              {group.name}
+            </option>
+          ))}
+        </select>
+      </div>
     </div>
   );
 }
diff --git a/src/features/staking/rewards/computeRewards.test.ts b/src/features/staking/rewards/computeRewards.test.ts
index c96aa04..5018699 100644
--- a/src/features/staking/rewards/computeRewards.test.ts
+++ b/src/features/staking/rewards/computeRewards.test.ts
@@ -2,11 +2,11 @@ import {
   computeStakingRewards,
   getTimeWeightedAverageActive,
 } from 'src/features/staking/rewards/computeRewards';
-import { StakeEvent, StakeEventType, StakingBalances } from 'src/features/staking/types';
+import { GroupToStake, StakeEvent, StakeEventType } from 'src/features/staking/types';
 import { nowMinusDays } from 'src/test/time';
 import { toWei } from 'src/utils/amount';
 
-function stakes(activeAmount: number, group = '0x1'): StakingBalances {
+function stakes(activeAmount: number, group = '0x1'): GroupToStake {
   return {
     [group]: { active: toWei(activeAmount), pending: 0n },
   };
diff --git a/src/features/staking/rewards/computeRewards.ts b/src/features/staking/rewards/computeRewards.ts
index 3af63f4..96f9a9f 100644
--- a/src/features/staking/rewards/computeRewards.ts
+++ b/src/features/staking/rewards/computeRewards.ts
@@ -1,4 +1,4 @@
-import { StakeEvent, StakeEventType, StakingBalances } from 'src/features/staking/types';
+import { GroupToStake, StakeEvent, StakeEventType } from 'src/features/staking/types';
 import { fromWei } from 'src/utils/amount';
 import { logger } from 'src/utils/logger';
 import { objKeys } from 'src/utils/objects';
@@ -6,7 +6,7 @@ import { getDaysBetween } from 'src/utils/time';
 
 export function computeStakingRewards(
   stakeEvents: StakeEvent[],
-  stakes: StakingBalances,
+  stakes: GroupToStake,
   mode: 'amount' | 'apy' = 'amount',
 ): Record<Address, number> {
   return mode === 'amount'
@@ -14,7 +14,7 @@ export function computeStakingRewards(
     : computeRewardApy(stakeEvents, stakes);
 }
 
-function computeRewardAmount(stakeEvents: StakeEvent[], stakes: StakingBalances) {
+function computeRewardAmount(stakeEvents: StakeEvent[], stakes: GroupToStake) {
   const groupTotals: Record<Address, bigint> = {}; // group addr to sum votes
   for (const event of stakeEvents) {
     const { group, type, value } = event;
@@ -41,7 +41,7 @@ function computeRewardAmount(stakeEvents: StakeEvent[], stakes: StakingBalances)
   return groupRewards;
 }
 
-function computeRewardApy(stakeEvents: StakeEvent[], stakes: StakingBalances) {
+function computeRewardApy(stakeEvents: StakeEvent[], stakes: GroupToStake) {
   // First get total reward amounts per group
   const groupRewardAmounts = computeRewardAmount(stakeEvents, stakes);
 
diff --git a/src/features/staking/rewards/useStakingRewards.ts b/src/features/staking/rewards/useStakingRewards.ts
index d328e48..d94239f 100644
--- a/src/features/staking/rewards/useStakingRewards.ts
+++ b/src/features/staking/rewards/useStakingRewards.ts
@@ -2,10 +2,10 @@ import { useQuery } from '@tanstack/react-query';
 import { useToastError } from 'src/components/notifications/useToastError';
 import { computeStakingRewards } from 'src/features/staking/rewards/computeRewards';
 import { fetchStakeEvents } from 'src/features/staking/rewards/fetchStakeHistory';
-import { StakingBalances } from 'src/features/staking/types';
+import { GroupToStake } from 'src/features/staking/types';
 import { logger } from 'src/utils/logger';
 
-export function useStakingRewards(address?: Address, stakes?: StakingBalances) {
+export function useStakingRewards(address?: Address, stakes?: GroupToStake) {
   const { isLoading, isError, error, data } = useQuery({
     queryKey: ['useStakingRewards', address, stakes],
     queryFn: async () => {
diff --git a/src/features/staking/types.ts b/src/features/staking/types.ts
index 01a557a..a15f596 100644
--- a/src/features/staking/types.ts
+++ b/src/features/staking/types.ts
@@ -1,3 +1,6 @@
+export type GroupToStake = Record<Address, { active: bigint; pending: bigint }>;
+export type StakingBalances = { active: bigint; pending: bigint; total: bigint };
+
 export enum StakeActionType {
   Vote = 'vote',
   Activate = 'activate',
@@ -16,8 +19,6 @@ export function stakeActionLabel(type: StakeActionType, activeTense = false) {
   }
 }
 
-export type StakingBalances = Record<Address, { active: bigint; pending: bigint }>;
-
 export enum StakeEventType {
   Activate = 'activate',
   Revoke = 'revoke', // Revoke of active votes (i.e. not pending)
diff --git a/src/features/staking/useStakingBalances.ts b/src/features/staking/useStakingBalances.ts
index bfbd17c..22be80a 100644
--- a/src/features/staking/useStakingBalances.ts
+++ b/src/features/staking/useStakingBalances.ts
@@ -2,7 +2,7 @@ import { electionABI } from '@celo/abis';
 import { useQuery } from '@tanstack/react-query';
 import { useToastError } from 'src/components/notifications/useToastError';
 import { Addresses } from 'src/config/contracts';
-import { StakingBalances } from 'src/features/staking/types';
+import { GroupToStake } from 'src/features/staking/types';
 import { logger } from 'src/utils/logger';
 import { objKeys } from 'src/utils/objects';
 import { PublicClient, usePublicClient } from 'wagmi';
@@ -12,10 +12,16 @@ export function useStakingBalances(address?: Address) {
 
   const { isLoading, isError, error, data } = useQuery({
     queryKey: ['useStakingBalances', publicClient, address],
-    queryFn: () => {
+    queryFn: async () => {
       if (!address) return null;
       logger.debug('Fetching staking balances');
-      return fetchStakingBalances(publicClient, address);
+      const groupToStake = await fetchStakingBalances(publicClient, address);
+      const stakes = Object.values(groupToStake);
+      const active = stakes.reduce((acc, stake) => acc + stake.active, 0n);
+      const pending = stakes.reduce((acc, stake) => acc + stake.pending, 0n);
+      const total = active + pending;
+      const stakeBalances = { active, pending, total };
+      return { groupToStake, stakeBalances };
     },
     gcTime: 10 * 60 * 1000, // 10 minutes
     staleTime: 1 * 60 * 1000, // 1 minute
@@ -26,7 +32,8 @@ export function useStakingBalances(address?: Address) {
   return {
     isLoading,
     isError,
-    stakes: data || undefined,
+    groupToStake: data?.groupToStake,
+    stakeBalances: data?.stakeBalances,
   };
 }
 
@@ -60,7 +67,7 @@ export async function fetchStakingBalances(publicClient: PublicClient, address:
     })),
   });
 
-  const votes: StakingBalances = {};
+  const votes: GroupToStake = {};
   for (let i = 0; i < groupAddrs.length; i++) {
     const groupAddr = groupAddrs[i];
     const pending = pendingVotes[i];
@@ -75,7 +82,7 @@ export async function fetchStakingBalances(publicClient: PublicClient, address:
 
 export async function checkHasActivatable(
   publicClient: PublicClient,
-  stakes: StakingBalances,
+  stakes: GroupToStake,
   address: Address,
 ) {
   const groupsWithPending = objKeys(stakes).filter((groupAddr) => stakes[groupAddr].pending > 0);
diff --git a/src/features/validators/ValidatorGroupTable.tsx b/src/features/validators/ValidatorGroupTable.tsx
index 60925ae..6dedc6c 100644
--- a/src/features/validators/ValidatorGroupTable.tsx
+++ b/src/features/validators/ValidatorGroupTable.tsx
@@ -18,6 +18,8 @@ import { config } from 'src/config/config';
 
 import Link from 'next/link';
 import { TabHeaderButton } from 'src/components/buttons/TabHeaderButton';
+import { useStore } from 'src/features/store';
+import { TxModalType } from 'src/features/transactions/types';
 import { ValidatorGroupLogo } from 'src/features/validators/ValidatorGroupLogo';
 import { cleanGroupName, isElected } from 'src/features/validators/utils';
 import { useIsMobile } from 'src/styles/mediaQueries';
@@ -147,6 +149,8 @@ export function ValidatorGroupTable({
 }
 
 function useTableColumns(totalVotes: bigint) {
+  const setTxModal = useStore((state) => state.setTransactionModal);
+
   return useMemo(() => {
     const columnHelper = createColumnHelper<ValidatorGroupRow>();
     return [
@@ -195,7 +199,7 @@ function useTableColumns(totalVotes: bigint) {
           <OutlineButton
             onClick={(e) => {
               e.preventDefault();
-              alert(props.row.original.address);
+              setTxModal({ type: TxModalType.Stake, props: { defaultGroup: props.row.original } });
             }}
           >
             <div className="flex items-center space-x-1.5">
@@ -206,7 +210,7 @@ function useTableColumns(totalVotes: bigint) {
         ),
       }),
     ];
-  }, [totalVotes]);
+  }, [totalVotes, setTxModal]);
 }
 
 function useTableRows({
diff --git a/src/features/wallet/WalletDropdown.tsx b/src/features/wallet/WalletDropdown.tsx
index a421239..8a64296 100644
--- a/src/features/wallet/WalletDropdown.tsx
+++ b/src/features/wallet/WalletDropdown.tsx
@@ -53,8 +53,8 @@ function DropdownContent({
   // TODO update these hooks with a refetch interval after upgrading to wagmi v2
   const { balance: walletBalance } = useBalance(address);
   const { lockedBalance } = useLockedBalance(address);
-  const { stakes } = useStakingBalances(address);
-  const { totalRewards } = useStakingRewards(address, stakes);
+  const { groupToStake } = useStakingBalances(address);
+  const { totalRewards } = useStakingRewards(address, groupToStake);
 
   const totalBalance = (walletBalance?.value || 0n) + (lockedBalance?.value || 0n);