diff --git a/src/custom-functions/bcode.test.ts b/src/custom-functions/bcode.test.ts
index 219423c..ef0820c 100644
--- a/src/custom-functions/bcode.test.ts
+++ b/src/custom-functions/bcode.test.ts
@@ -29,4 +29,5 @@ test('isV3Call', () => {
   expect(isV3Call('2020Q1', 'net_sales')).toBeTruthy()
   expect(isV3Call('LYLQ', 'net_sales')).toBeTruthy()
   expect(isV3Call('2020-09-06', 'market_capital')).toBeTruthy()
+  expect(isV3Call('latest', 'market_capital')).toBeTruthy()
 })
diff --git a/src/fiscal-periods/period-parser.test.ts b/src/fiscal-periods/period-parser.test.ts
index b784018..e79bf6c 100644
--- a/src/fiscal-periods/period-parser.test.ts
+++ b/src/fiscal-periods/period-parser.test.ts
@@ -13,12 +13,15 @@ test('parse', () => {
   expect(PeriodParser.parse('2020LQ')).toEqual(new YearQuarterParam(2020, LQ))
   expect(PeriodParser.parse('LYQ3')).toEqual(new YearQuarterParam(LY, 3))
   expect(PeriodParser.parse('LYLQ')).toEqual(new YearQuarterParam(LY, LQ))
+  expect(PeriodParser.parse('lylq')).toEqual(new YearQuarterParam(LY, LQ))
   expect(PeriodParser.parse('LY-1Q4')).toEqual(new YearQuarterParam(new LyWithOffset(-1), 4))
   expect(PeriodParser.parse('2020LQ-1')).toEqual(new YearQuarterParam(2020, new LqWithOffset(-1)))
   expect(PeriodParser.parse('LY-1LQ-1')).toEqual(new YearQuarterParam(new LyWithOffset(-1), new LqWithOffset(-1)))
+  expect(PeriodParser.parse('ly-1lq-1')).toEqual(new YearQuarterParam(new LyWithOffset(-1), new LqWithOffset(-1)))
   expect(PeriodParser.parse('2020-09-06')).toEqual(new DateParam(new Date('2020-09-06')))
+  expect(PeriodParser.parse('latest')).toEqual(new DateParam('latest'))
+  expect(PeriodParser.parse('Latest')).toEqual(new DateParam('latest'))
   expect(() => PeriodParser.parse('foo')).toThrow(ParseError)
   expect(() => PeriodParser.parse('2020/09/06')).toThrow(ParseError)
-  expect(() => PeriodParser.parse('latest')).toThrow(ParseError)
   expect(() => PeriodParser.parse('0Q1')).toThrow(ParseError)
 })
diff --git a/src/fiscal-periods/period-parser.ts b/src/fiscal-periods/period-parser.ts
index b1a9e7f..6c2553d 100644
--- a/src/fiscal-periods/period-parser.ts
+++ b/src/fiscal-periods/period-parser.ts
@@ -8,8 +8,6 @@ export class PeriodParser {
   }
 
   static parse(str: string): DateParam | YearQuarterParam {
-    str = str.toUpperCase()
-
     try {
       return YearQuarterParam.parse(str)
     } catch {
@@ -17,10 +15,7 @@ export class PeriodParser {
     }
 
     try {
-      const date = DateParam.parse(str)
-      if (!date.isLatest()) {
-        return date
-      }
+      return DateParam.parse(str)
     } catch {
       // noop
     }