diff --git a/pyserum/_layouts/instructions.py b/pyserum/_layouts/instructions.py
index c615f09..a0b92a0 100644
--- a/pyserum/_layouts/instructions.py
+++ b/pyserum/_layouts/instructions.py
@@ -1,9 +1,9 @@
 """Layouts for dex instructions data."""
 from enum import IntEnum
 
-from construct import Switch
 from construct import Bytes, Const, Int8ul, Int16ul, Int32ul, Int64ul, Pass
 from construct import Struct as cStruct
+from construct import Switch
 
 from .slab import KEY
 
@@ -19,6 +19,8 @@ class InstructionType(IntEnum):
     NEW_ORDER_V3 = 10
     CANCEL_ORDER_V2 = 11
     CANCEL_ORDER_BY_CLIENT_ID_V2 = 12
+    CLOSE_OPEN_ORDERS = 14
+    INIT_OPEN_ORDERS = 15
 
 
 _VERSION = 0
@@ -70,6 +72,9 @@ _CANCEL_ORDER_V2 = cStruct(
 
 _CANCEL_ORDER_BY_CLIENTID_V2 = cStruct("client_id" / Int64ul)
 
+_CLOSE_OPEN_ORDERS = cStruct()
+_INIT_OPEN_ORDERS = cStruct()
+
 INSTRUCTIONS_LAYOUT = cStruct(
     "version" / Const(_VERSION, Int8ul),
     "instruction_type" / Int32ul,
@@ -87,6 +92,8 @@ INSTRUCTIONS_LAYOUT = cStruct(
             InstructionType.NEW_ORDER_V3: _NEW_ORDER_V3,
             InstructionType.CANCEL_ORDER_V2: _CANCEL_ORDER_V2,
             InstructionType.CANCEL_ORDER_BY_CLIENT_ID_V2: _CANCEL_ORDER_BY_CLIENTID_V2,
+            InstructionType.CLOSE_OPEN_ORDERS: _CLOSE_OPEN_ORDERS,
+            InstructionType.INIT_OPEN_ORDERS: _INIT_OPEN_ORDERS,
         },
     ),
 )
diff --git a/pyserum/_layouts/open_orders.py b/pyserum/_layouts/open_orders.py
index dd9c84d..f49a499 100644
--- a/pyserum/_layouts/open_orders.py
+++ b/pyserum/_layouts/open_orders.py
@@ -1,4 +1,5 @@
-from construct import Bytes, Int64ul, Padding, Struct as cStruct
+from construct import Bytes, Int64ul, Padding
+from construct import Struct as cStruct
 
 from .account_flags import ACCOUNT_FLAGS_LAYOUT
 
diff --git a/pyserum/_layouts/queue.py b/pyserum/_layouts/queue.py
index 4ff4684..8b1e7de 100644
--- a/pyserum/_layouts/queue.py
+++ b/pyserum/_layouts/queue.py
@@ -1,4 +1,4 @@
-from construct import BitStruct, BitsInteger, BitsSwapped, Bytes, Const, Flag, Int8ul, Int32ul, Int64ul, Padding
+from construct import BitsInteger, BitsSwapped, BitStruct, Bytes, Const, Flag, Int8ul, Int32ul, Int64ul, Padding
 from construct import Struct as cStruct
 
 from .account_flags import ACCOUNT_FLAGS_LAYOUT
diff --git a/pyserum/_layouts/slab.py b/pyserum/_layouts/slab.py
index 9541f4c..f3359ee 100644
--- a/pyserum/_layouts/slab.py
+++ b/pyserum/_layouts/slab.py
@@ -3,8 +3,9 @@ from __future__ import annotations
 
 from enum import IntEnum
 
-from construct import Switch, Bytes, Int8ul, Int32ul, Int64ul, Padding
+from construct import Bytes, Int8ul, Int32ul, Int64ul, Padding
 from construct import Struct as cStruct
+from construct import Switch
 
 from .account_flags import ACCOUNT_FLAGS_LAYOUT
 
diff --git a/pyserum/async_connection.py b/pyserum/async_connection.py
index 7311e31..119bb7c 100644
--- a/pyserum/async_connection.py
+++ b/pyserum/async_connection.py
@@ -1,9 +1,10 @@
 from typing import List
+
 import httpx
 from solana.rpc.async_api import AsyncClient as async_conn  # pylint: disable=unused-import # noqa:F401
 
-from .market.types import MarketInfo, TokenInfo
 from .connection import LIVE_MARKETS_URL, TOKEN_MINTS_URL, parse_live_markets, parse_token_mints
+from .market.types import MarketInfo, TokenInfo
 
 
 async def get_live_markets(httpx_client: httpx.AsyncClient) -> List[MarketInfo]:
diff --git a/pyserum/async_open_orders_account.py b/pyserum/async_open_orders_account.py
index 0b6917c..838bb32 100644
--- a/pyserum/async_open_orders_account.py
+++ b/pyserum/async_open_orders_account.py
@@ -1,10 +1,11 @@
 from __future__ import annotations
 
 from typing import List
-from solana.rpc.async_api import AsyncClient
+
 from solana.publickey import PublicKey
-from solana.rpc.types import Commitment
+from solana.rpc.async_api import AsyncClient
 from solana.rpc.commitment import Recent
+from solana.rpc.types import Commitment
 
 from .async_utils import load_bytes_data
 from .open_orders_account import _OpenOrdersAccountCore
diff --git a/pyserum/connection.py b/pyserum/connection.py
index 5e99c3d..77f0adc 100644
--- a/pyserum/connection.py
+++ b/pyserum/connection.py
@@ -1,9 +1,9 @@
-from typing import List, Dict, Any
+from typing import Any, Dict, List
 
 import requests
-
-from solana.rpc.api import Client as conn  # pylint: disable=unused-import # noqa:F401
 from solana.publickey import PublicKey
+from solana.rpc.api import Client as conn  # pylint: disable=unused-import # noqa:F401
+
 from .market.types import MarketInfo, TokenInfo
 
 LIVE_MARKETS_URL = "https://raw.githubusercontent.com/project-serum/serum-ts/master/packages/serum/src/markets.json"
diff --git a/pyserum/instructions.py b/pyserum/instructions.py
index f69f806..6c61d1a 100644
--- a/pyserum/instructions.py
+++ b/pyserum/instructions.py
@@ -1,12 +1,12 @@
 """Serum Dex Instructions."""
 from typing import Dict, List, NamedTuple, Optional
 
+from construct import Container
 from solana.publickey import PublicKey
 from solana.sysvar import SYSVAR_RENT_PUBKEY
 from solana.transaction import AccountMeta, TransactionInstruction
 from solana.utils.validate import validate_instruction_keys, validate_instruction_type
 from spl.token.constants import TOKEN_PROGRAM_ID
-from construct import Container
 
 from ._layouts.instructions import INSTRUCTIONS_LAYOUT, InstructionType
 from .enums import OrderType, SelfTradeBehavior, Side
@@ -268,6 +268,36 @@ class CancelOrderByClientIDV2Params(NamedTuple):
     """"""
 
 
+class CloseOpenOrdersParams(NamedTuple):
+    """Cancel order by client ID params."""
+
+    open_orders: PublicKey
+    """"""
+    owner: PublicKey
+    """"""
+    sol_wallet: PublicKey
+    """"""
+    market: PublicKey
+    """"""
+    program_id: PublicKey = DEFAULT_DEX_PROGRAM_ID
+    """"""
+
+
+class InitOpenOrdersParams(NamedTuple):
+    """Cancel order by client ID params."""
+
+    open_orders: PublicKey
+    """"""
+    owner: PublicKey
+    """"""
+    market: PublicKey
+    """"""
+    market_authority: Optional[PublicKey] = None
+    """"""
+    program_id: PublicKey = DEFAULT_DEX_PROGRAM_ID
+    """"""
+
+
 def __parse_and_validate_instruction(
     instruction: TransactionInstruction, instruction_type: InstructionType
 ) -> Container:
@@ -282,6 +312,8 @@ def __parse_and_validate_instruction(
         InstructionType.NEW_ORDER_V3: 12,
         InstructionType.CANCEL_ORDER_V2: 6,
         InstructionType.CANCEL_ORDER_BY_CLIENT_ID_V2: 6,
+        InstructionType.CLOSE_OPEN_ORDERS: 4,
+        InstructionType.INIT_OPEN_ORDERS: 3,
     }
     validate_instruction_keys(instruction, instruction_type_to_length_map[instruction_type])
     data = INSTRUCTIONS_LAYOUT.parse(instruction.data)
@@ -289,7 +321,9 @@ def __parse_and_validate_instruction(
     return data
 
 
-def decode_initialize_market(instruction: TransactionInstruction) -> InitializeMarketParams:
+def decode_initialize_market(
+    instruction: TransactionInstruction,
+) -> InitializeMarketParams:
     """Decode an instialize market instruction and retrieve the instruction params."""
     data = __parse_and_validate_instruction(instruction, InstructionType.INITIALIZE_MARKET)
     return InitializeMarketParams(
@@ -382,7 +416,9 @@ def decode_settle_funds(instruction: TransactionInstruction) -> SettleFundsParam
     )
 
 
-def decode_cancel_order_by_client_id(instruction: TransactionInstruction) -> CancelOrderByClientIDParams:
+def decode_cancel_order_by_client_id(
+    instruction: TransactionInstruction,
+) -> CancelOrderByClientIDParams:
     data = __parse_and_validate_instruction(instruction, InstructionType.CANCEL_ORDER_BY_CLIENT_ID)
     return CancelOrderByClientIDParams(
         market=instruction.keys[0].pubkey,
@@ -445,6 +481,29 @@ def decode_cancel_order_by_client_id_v2(instruction: TransactionInstruction) ->
     )
 
 
+def decode_close_open_orders(
+    instruction: TransactionInstruction,
+) -> CloseOpenOrdersParams:
+    return CloseOpenOrdersParams(
+        open_orders=instruction.keys[0].pubkey,
+        owner=instruction.keys[1].pubkey,
+        sol_wallet=instruction.keys[2].pubkey,
+        market=instruction.keys[3].pubkey,
+    )
+
+
+def decode_init_open_orders(
+    instruction: TransactionInstruction,
+) -> InitOpenOrdersParams:
+    market_authority = instruction.keys[3].pubkey if len(instruction.keys) == 4 else None
+    return InitOpenOrdersParams(
+        open_orders=instruction.keys[0].pubkey,
+        owner=instruction.keys[1].pubkey,
+        market=instruction.keys[2].pubkey,
+        market_authority=market_authority,
+    )
+
+
 def initialize_market(params: InitializeMarketParams) -> TransactionInstruction:
     """Generate a transaction instruction to initialize a Serum market."""
     return TransactionInstruction(
@@ -519,7 +578,10 @@ def match_orders(params: MatchOrdersParams) -> TransactionInstruction:
         ],
         program_id=params.program_id,
         data=INSTRUCTIONS_LAYOUT.build(
-            dict(instruction_type=InstructionType.MATCH_ORDER, args=dict(limit=params.limit))
+            dict(
+                instruction_type=InstructionType.MATCH_ORDER,
+                args=dict(limit=params.limit),
+            )
         ),
     )
 
@@ -534,7 +596,10 @@ def consume_events(params: ConsumeEventsParams) -> TransactionInstruction:
         keys=keys,
         program_id=params.program_id,
         data=INSTRUCTIONS_LAYOUT.build(
-            dict(instruction_type=InstructionType.CONSUME_EVENTS, args=dict(limit=params.limit))
+            dict(
+                instruction_type=InstructionType.CONSUME_EVENTS,
+                args=dict(limit=params.limit),
+            )
         ),
     )
 
@@ -582,7 +647,9 @@ def settle_funds(params: SettleFundsParams) -> TransactionInstruction:
     )
 
 
-def cancel_order_by_client_id(params: CancelOrderByClientIDParams) -> TransactionInstruction:
+def cancel_order_by_client_id(
+    params: CancelOrderByClientIDParams,
+) -> TransactionInstruction:
     """Generate a transaction instruction to cancel order by client id."""
     return TransactionInstruction(
         keys=[
@@ -668,7 +735,9 @@ def cancel_order_v2(params: CancelOrderV2Params) -> TransactionInstruction:
     )
 
 
-def cancel_order_by_client_id_v2(params: CancelOrderByClientIDV2Params) -> TransactionInstruction:
+def cancel_order_by_client_id_v2(
+    params: CancelOrderByClientIDV2Params,
+) -> TransactionInstruction:
     """Generate a transaction instruction to cancel order by client id."""
     return TransactionInstruction(
         keys=[
@@ -689,3 +758,35 @@ def cancel_order_by_client_id_v2(params: CancelOrderByClientIDV2Params) -> Trans
             )
         ),
     )
+
+
+def close_open_orders(params: CloseOpenOrdersParams) -> TransactionInstruction:
+    """Generate a transaction instruction to close open orders account."""
+    return TransactionInstruction(
+        keys=[
+            AccountMeta(pubkey=params.open_orders, is_signer=False, is_writable=True),
+            AccountMeta(pubkey=params.owner, is_signer=True, is_writable=False),
+            AccountMeta(pubkey=params.sol_wallet, is_signer=False, is_writable=True),
+            AccountMeta(pubkey=params.market, is_signer=False, is_writable=False),
+        ],
+        program_id=params.program_id,
+        data=INSTRUCTIONS_LAYOUT.build(dict(instruction_type=InstructionType.CLOSE_OPEN_ORDERS, args=dict())),
+    )
+
+
+def init_open_orders(params: InitOpenOrdersParams) -> TransactionInstruction:
+    """Generate a transaction instruction to initialize open orders account."""
+    touched_keys = [
+        AccountMeta(pubkey=params.open_orders, is_signer=False, is_writable=True),
+        AccountMeta(pubkey=params.owner, is_signer=True, is_writable=False),
+        AccountMeta(pubkey=params.market, is_signer=False, is_writable=False),
+    ]
+    if params.market_authority:
+        touched_keys.append(
+            AccountMeta(pubkey=params.market_authority, is_signer=False, is_writable=False),
+        )
+    return TransactionInstruction(
+        keys=touched_keys,
+        program_id=params.program_id,
+        data=INSTRUCTIONS_LAYOUT.build(dict(instruction_type=InstructionType.INIT_OPEN_ORDERS, args=dict())),
+    )
diff --git a/pyserum/market/__init__.py b/pyserum/market/__init__.py
index 9a2aadd..2f53a13 100644
--- a/pyserum/market/__init__.py
+++ b/pyserum/market/__init__.py
@@ -1,4 +1,4 @@
-from .market import Market  # noqa: F401
 from .async_market import AsyncMarket  # noqa: F401
+from .market import Market  # noqa: F401
 from .orderbook import OrderBook  # noqa: F401
 from .state import MarketState as State  # noqa: F401
diff --git a/pyserum/market/async_market.py b/pyserum/market/async_market.py
index c0d11f5..df92520 100644
--- a/pyserum/market/async_market.py
+++ b/pyserum/market/async_market.py
@@ -9,17 +9,17 @@ from solana.rpc.async_api import AsyncClient
 from solana.rpc.types import RPCResponse, TxOpts
 from solana.transaction import Transaction
 
-from pyserum import instructions
 import pyserum.market.types as t
+from pyserum import instructions
 
 from .._layouts.open_orders import OPEN_ORDERS_LAYOUT
-from ..enums import OrderType, Side
 from ..async_open_orders_account import AsyncOpenOrdersAccount
 from ..async_utils import load_bytes_data
+from ..enums import OrderType, Side
 from ._internal.queue import decode_event_queue, decode_request_queue
+from .core import MarketCore
 from .orderbook import OrderBook
 from .state import MarketState
-from .core import MarketCore
 
 LAMPORTS_PER_SOL = 1000000000
 
diff --git a/pyserum/market/core.py b/pyserum/market/core.py
index d85efe0..45ffbcd 100644
--- a/pyserum/market/core.py
+++ b/pyserum/market/core.py
@@ -11,15 +11,14 @@ from solana.rpc.types import RPCResponse
 from solana.system_program import CreateAccountParams, create_account
 from solana.transaction import Transaction, TransactionInstruction
 from spl.token.constants import ACCOUNT_LEN, TOKEN_PROGRAM_ID, WRAPPED_SOL_MINT
-from spl.token.instructions import CloseAccountParams
-from spl.token.instructions import InitializeAccountParams, close_account, initialize_account
+from spl.token.instructions import CloseAccountParams, InitializeAccountParams, close_account, initialize_account
 
-from pyserum import instructions
 import pyserum.market.types as t
+from pyserum import instructions
 
+from ..async_open_orders_account import AsyncOpenOrdersAccount
 from ..enums import OrderType, SelfTradeBehavior, Side
 from ..open_orders_account import OpenOrdersAccount, make_create_account_instruction
-from ..async_open_orders_account import AsyncOpenOrdersAccount
 from ._internal.queue import decode_event_queue
 from .orderbook import OrderBook
 from .state import MarketState
diff --git a/pyserum/market/market.py b/pyserum/market/market.py
index cba0048..ecd91e4 100644
--- a/pyserum/market/market.py
+++ b/pyserum/market/market.py
@@ -9,17 +9,17 @@ from solana.rpc.api import Client
 from solana.rpc.types import RPCResponse, TxOpts
 from solana.transaction import Transaction
 
-from pyserum import instructions
 import pyserum.market.types as t
+from pyserum import instructions
 
 from .._layouts.open_orders import OPEN_ORDERS_LAYOUT
 from ..enums import OrderType, Side
 from ..open_orders_account import OpenOrdersAccount
 from ..utils import load_bytes_data
 from ._internal.queue import decode_event_queue, decode_request_queue
+from .core import MarketCore
 from .orderbook import OrderBook
 from .state import MarketState
-from .core import MarketCore
 
 LAMPORTS_PER_SOL = 1000000000
 
diff --git a/pyserum/market/state.py b/pyserum/market/state.py
index 4e3861e..5b1a153 100644
--- a/pyserum/market/state.py
+++ b/pyserum/market/state.py
@@ -7,7 +7,7 @@ from solana.publickey import PublicKey
 from solana.rpc.api import Client
 from solana.rpc.async_api import AsyncClient
 
-from pyserum import utils, async_utils
+from pyserum import async_utils, utils
 
 from .._layouts.market import MARKET_LAYOUT
 from .types import AccountFlags
diff --git a/pyserum/open_orders_account.py b/pyserum/open_orders_account.py
index c973a56..a9cc4c3 100644
--- a/pyserum/open_orders_account.py
+++ b/pyserum/open_orders_account.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 import base64
-from typing import List, NamedTuple, TypeVar, Type, Tuple
+from typing import List, NamedTuple, Tuple, Type, TypeVar
 
 from solana.publickey import PublicKey
 from solana.rpc.api import Client
diff --git a/tests/conftest.py b/tests/conftest.py
index f532d4d..2f32025 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,5 +1,5 @@
-from typing import Dict
 import asyncio
+from typing import Dict
 
 import pytest
 from solana.keypair import Keypair
@@ -7,8 +7,8 @@ from solana.publickey import PublicKey
 from solana.rpc.api import Client
 from solana.rpc.async_api import AsyncClient
 
-from pyserum.connection import conn
 from pyserum.async_connection import async_conn
+from pyserum.connection import conn
 
 
 @pytest.mark.integration
diff --git a/tests/integration/test_async_connection.py b/tests/integration/test_async_connection.py
index 699170f..85c7821 100644
--- a/tests/integration/test_async_connection.py
+++ b/tests/integration/test_async_connection.py
@@ -1,6 +1,6 @@
 # pylint: disable=R0801
-import pytest
 import httpx
+import pytest
 
 from pyserum.async_connection import get_live_markets, get_token_mints
 from pyserum.market.types import MarketInfo, TokenInfo
diff --git a/tests/test_instructions.py b/tests/test_instructions.py
index 2983a01..8d6b776 100644
--- a/tests/test_instructions.py
+++ b/tests/test_instructions.py
@@ -113,3 +113,36 @@ def test_settle_funds():
     )
     instruction = inlib.settle_funds(params)
     assert inlib.decode_settle_funds(instruction) == params
+
+
+def test_close_open_orders():
+    """Test settle funds."""
+    params = inlib.CloseOpenOrdersParams(
+        open_orders=PublicKey(0),
+        owner=PublicKey(1),
+        sol_wallet=PublicKey(2),
+        market=PublicKey(3),
+    )
+    instruction = inlib.close_open_orders(params)
+    assert inlib.decode_close_open_orders(instruction) == params
+
+
+def test_init_open_orders():
+    """Test settle funds."""
+    params = inlib.InitOpenOrdersParams(
+        open_orders=PublicKey(0), owner=PublicKey(1), market=PublicKey(2), market_authority=None
+    )
+    instruction = inlib.init_open_orders(params)
+    assert inlib.decode_init_open_orders(instruction) == params
+
+
+def test_init_open_orders_with_authority():
+    """Test settle funds."""
+    params = inlib.InitOpenOrdersParams(
+        open_orders=PublicKey(0),
+        owner=PublicKey(1),
+        market=PublicKey(2),
+        market_authority=PublicKey(3),
+    )
+    instruction = inlib.init_open_orders(params)
+    assert inlib.decode_init_open_orders(instruction) == params