diff --git a/negodata/backend/crud/quotation_crud.py b/negodata/backend/crud/quotation_crud.py
index 4a9a011..aa1f6ec 100644
--- a/negodata/backend/crud/quotation_crud.py
+++ b/negodata/backend/crud/quotation_crud.py
@@ -8,7 +8,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from common.database.db_session_manager import DB_SESSION_MNG
 from common.database.model.models import (
     quotations, sessions, chats, nego_cards, wild_cards, items, suppliers, quotation_settings,
-    version_nego_cards, version_wild_cards, users, supplier_items,
+    version_nego_cards, version_wild_cards, users, supplier_items, companies,
 )
 from common.enums import CloseReason, ErrorType, QuotationStatus, SessionStatus
 from common.logger import LOG
@@ -384,6 +384,25 @@ class QuotationCRUD(IQuotationCRUD):
             LOG.e_no_callstack(ex)
             return ErrorType.DB_RUN_FAILED, {}
 
+    async def get_email_header(self, cdb: AsyncSession, user_id):
+        # 견적 소유 유저 → 회사 → companies.settings.branding.email_header. 초청 메일 헤더 브랜딩용. 없으면 None.
+        try:
+            query = (
+                select(companies.settings)
+                .select_from(users)
+                .join(companies, companies.company_id == users.company_id)
+                .where(users.user_id == user_id, companies.deleted == False)  # noqa: E712
+                .limit(1)
+            )
+            err, rows = await DB_SESSION_MNG.execute(cdb, query)
+            if err != ErrorType.SUCCESS or not rows:
+                return None
+            settings = rows[0] or {}
+            return (settings.get("branding") or {}).get("email_header")
+        except Exception as ex:
+            LOG.e_no_callstack(ex)
+            return None
+
     async def get_item_companies(self, cdb: AsyncSession, item_ids) -> Tuple[ErrorType, dict]:
         """item_id -> company_id(소유 회사) 매핑. 앵커링 칸(회사×유형×가격구간) 해석 입력."""
         try:
diff --git a/negodata/backend/services/email.py b/negodata/backend/services/email.py
index eaea9ed..9f2db41 100644
--- a/negodata/backend/services/email.py
+++ b/negodata/backend/services/email.py
@@ -96,6 +96,7 @@ def build_invite_email(
     qt_number: str,
     end_time: datetime | None,
     chat_url: str,
+    email_header: str | None = None,
 ) -> tuple[str, str, str]:
     """협상 초청 메일 (제목/HTML/텍스트) 생성.
 
@@ -113,6 +114,7 @@ def build_invite_email(
         qt_number=escape(qt_number),
         deadline=escape(deadline),
         chat_url=escape(chat_url),
+        email_header=escape(email_header or "NEGODATA"),
     )
 
     text = (
diff --git a/negodata/backend/services/email_templates/invite_email.html b/negodata/backend/services/email_templates/invite_email.html
index aa79386..7aa45dd 100644
--- a/negodata/backend/services/email_templates/invite_email.html
+++ b/negodata/backend/services/email_templates/invite_email.html
@@ -6,7 +6,7 @@
         <!-- 헤더 바 -->
         <tr>
           <td style="background-color:#2563eb;padding:18px 28px;">
-            <span style="color:#ffffff;font-size:16px;font-weight:700;letter-spacing:1px;">NEGODATA</span>
+            <span style="color:#ffffff;font-size:16px;font-weight:700;letter-spacing:1px;">$email_header</span>
           </td>
         </tr>
 
diff --git a/negodata/backend/services/quotation_service.py b/negodata/backend/services/quotation_service.py
index 7ea2b7c..a921b3f 100644
--- a/negodata/backend/services/quotation_service.py
+++ b/negodata/backend/services/quotation_service.py
@@ -962,6 +962,11 @@ class QuotationService:
     async def _send_invites(self, quotation, targets: list, res: Res_NotifySessions) -> list:
         """targets [(session, supplier_name, email)] 에 초청 메일 발송. res.sent/failed 를 채우고
         성공한 session_id 목록을 반환. ACS/SMTP 미설정이면 첫 발송에서 중단(EMAIL_NOT_CONFIGURED)."""
+        # 회사 브랜딩(초청 메일 헤더) 한 번 조회 — 견적당 동일.
+        email_header = await DB_SESSION_MNG.execute_lambda(
+            quotations.DBType(), DBWRType.DB_READ.value,
+            lambda s: self.quotation_crud.get_email_header(s, quotation.user_id),
+        )
         sent_ids = []
         for sess, sp_name, email in targets:
             subject, html, text = build_invite_email(
@@ -970,6 +975,7 @@ class QuotationService:
                 qt_number=quotation.number,
                 end_time=quotation.end_time,
                 chat_url=self._session_chat_url(sess.session_id),
+                email_header=email_header,
             )
             try:
                 await send_email(email, subject, html, text)