Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

Duolingo, Inc.

DUOL · Nasdaq · CIK 0001562088 · Technology · Software—Application

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

64 Form 4 transaction lines observed in the same window
33 sales · 31 option, withholding, award, gift or other lines

Last qualifying purchase2026-03-03 · Shelton James H · $498.8K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesHigh
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
von Ahn LuisPresident & CEO, Co-Founder
○▼○▼○▼○▼○▼
Chen Stephen C.General Counsel
▼▼○▼▼
Glance NatalieChief Engineering Officer
○▼▼▼▼
Meese RobertChief Business Officer
○▼▼
Shelton James HDirector
○○○
Schlosser MarioDirector
○○○
● Purchase▼ Sale○ Other

Showing the six most active owners; 6 additional owner(s) remain in Form 4 evidence.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2026-03-03 · Shelton James H.

Recent Form 4 activity

1Purchases
100Sales
44Other Form 4 lines
49SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING33 sale line(s) · context only
OTHER31 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
7,152,857
Previous report
6,573,989
Avg daily volume
1,064,073
Days to cover
6.7

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2026-03-03Shelton James HPurchase (P)Class A Common Stock5,000USD 99.76USD 498,800SEC filing ↗
2022-12-28Durable Capital Partners LPPurchase (P)Class A Common Stock5,000USD 67.12USD 335,600SEC filing ↗
2022-12-27Durable Capital Partners LPPurchase (P)Class A Common Stock14,611USD 69.06USD 1,009,020SEC filing ↗
2022-12-23Durable Capital Partners LPPurchase (P)Class A Common Stock20,000USD 70.29USD 1,405,800SEC filing ↗
2022-12-22Durable Capital Partners LPPurchase (P)Class A Common Stock71,288USD 70.74USD 5,043,212SEC filing ↗
2022-12-21Durable Capital Partners LPPurchase (P)Class A Common Stock7,100USD 72.93USD 517,803SEC filing ↗
2022-12-20Durable Capital Partners LPPurchase (P)Class A Common Stock54,155USD 72.70USD 3,937,118SEC filing ↗
2022-12-19Durable Capital Partners LPPurchase (P)Class A Common Stock67,052USD 72.22USD 4,842,457SEC filing ↗
2022-12-16Durable Capital Partners LPPurchase (P)Class A Common Stock37,398USD 72.93USD 2,727,602SEC filing ↗
2022-12-15Durable Capital Partners LPPurchase (P)Class A Common Stock67,789USD 72.82USD 4,936,494SEC filing ↗
2022-12-14Durable Capital Partners LPPurchase (P)Class A Common Stock3,921USD 72.98USD 286,165SEC filing ↗
2022-12-13Durable Capital Partners LPPurchase (P)Class A Common Stock31,530USD 72.75USD 2,293,724SEC filing ↗
2022-05-09Durable Capital Partners LPPurchase (P)Class A Common Stock136,968USD 75.29USD 10,311,726SEC filing ↗
2022-04-20Durable Capital Partners LPPurchase (P)Class A Common Stock17,400USD 88.93USD 1,547,382SEC filing ↗
2022-04-19Durable Capital Partners LPPurchase (P)Class A Common Stock23,335USD 88.97USD 2,076,069SEC filing ↗

Form 4 evidence

145 transaction lines in the latest 365-day window; 1,932 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-10Shelton James HAward / grant (A)Class A Common Stock100USD 149.92USD 14,992SEC filing ↗
2026-10-10Schlosser MarioAward / grant (A)Class A Common Stock116USD 149.92USD 17,391SEC filing ↗
2026-10-10Lilly III John OsborneAward / grant (A)Class A Common Stock98USD 149.92USD 14,692SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-10Shelton James HAward / grant (A)Class A Common Stock100USD 149.92USD 14,992SEC filing ↗
2026-10-10Schlosser MarioAward / grant (A)Class A Common Stock116USD 149.92USD 17,391SEC filing ↗
2026-10-10Lilly III John OsborneAward / grant (A)Class A Common Stock98USD 149.92USD 14,692SEC filing ↗
2026-10-10Bohutinsky AmyAward / grant (A)Class A Common Stock108USD 149.92USD 16,191SEC filing ↗
2026-10-07von Ahn LuisSale (S)Class A Common Stock110,046USD 151.70USD 16,694,000SEC filing ↗
2026-10-07von Ahn LuisC (C)Class A Common Stock110,046USD 38.08USD 4,190,552SEC filing ↗
2026-09-24von Ahn LuisSale (S)Class A Common Stock46,682USD 150.63USD 7,031,776SEC filing ↗
2026-09-24von Ahn LuisC (C)Class A Common Stock46,682USD 38.08USD 1,777,651SEC filing ↗
2026-09-22von Ahn LuisSale (S)Class A Common Stock3,614USD 151.91USD 548,996SEC filing ↗
2026-09-22von Ahn LuisC (C)Class A Common Stock3,614USD 38.08USD 137,621SEC filing ↗
2026-09-21von Ahn LuisSale (S)Class A Common Stock37,366USD 150.53USD 5,624,595SEC filing ↗
2026-09-21von Ahn LuisC (C)Class A Common Stock37,366USD 20.38USD 761,364SEC filing ↗
2026-09-16von Ahn LuisSale (S)Class A Common Stock28,292USD 150.22USD 4,250,007SEC filing ↗
2026-09-16von Ahn LuisC (C)Class A Common Stock28,292USD 18.81USD 532,233SEC filing ↗
2026-09-14Chen Stephen C.Sale (S)Class A Common Stock8,072USD 149.33USD 1,205,385SEC filing ↗
2026-09-08GORDON WILLIAM BSale (S)Class A Common Stock10,000USD 145.67USD 1,456,736SEC filing ↗
2026-08-18Glance NatalieSale (S)Class A Common Stock1,539USD 137.81USD 212,082SEC filing ↗
2026-08-17Meese RobertSale (S)Class A Common Stock1,354USD 129.13USD 174,842SEC filing ↗
2026-08-17Glance NatalieSale (S)Class A Common Stock2,751USD 129.13USD 355,237SEC filing ↗
2026-08-17Chen Stephen C.Sale (S)Class A Common Stock1,024USD 129.13USD 132,229SEC filing ↗
2026-08-10KRAWCHECK SALLIEAward / grant (A)Class A Common Stock4,592USD 0.00USD 0SEC filing ↗
2026-07-10Shelton James HAward / grant (A)Class A Common Stock120USD 124.76USD 14,971SEC filing ↗
2026-07-10Schlosser MarioAward / grant (A)Class A Common Stock140USD 124.76USD 17,466SEC filing ↗
2026-07-10Lilly III John OsborneAward / grant (A)Class A Common Stock118USD 124.76USD 14,722SEC filing ↗
2026-07-10Bohutinsky AmyAward / grant (A)Class A Common Stock130USD 124.76USD 16,219SEC filing ↗
2026-06-17Chen Stephen C.Option exercise / conversion (M)Class A Common Stock58USD 14.42USD 836SEC filing ↗
2026-06-03Shelton James HAward / grant (A)Class A Common Stock2,001USD 0.00USD 0SEC filing ↗
2026-06-03Schlosser MarioAward / grant (A)Class A Common Stock2,001USD 0.00USD 0SEC filing ↗
2026-06-03Ross BonnieAward / grant (A)Class A Common Stock2,001USD 0.00USD 0SEC filing ↗
2026-06-03Lilly III John OsborneAward / grant (A)Class A Common Stock2,001USD 0.00USD 0SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerDUOL
CIK0001562088
SectorTechnology
IndustrySoftware—Application Yahoo Finance
SEC SIC7372 Services-Prepackaged Software
ExchangeNasdaq

Data coverage

Local Form 4 history1,932 transaction lines from 2021-07-30 to 2026-10-10
101 P purchase lines · 1,505 S sale lines · 326 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.