Skip to content
SEC EDGAR · Forms 3/4/5Updated through Oct 30, 2026•78 filings

DUOL

Duolingo, Inc.

Net sales of $37M over the last 3 months

4 sellers account for the net balance. There is no cluster of three distinct buyers within 30 days. We found no CEO/CFO purchases over 12 months.

How to read this signal

Only open-market P purchases and S sales count toward the signal. Vesting, options, taxes and gifts remain in the source data but do not trigger alerts. Rule 10b5-1 trades are shown as informational.

JSON example

3-month balance

−$37,023,861

0 buyers · 4 sellers

12-month purchases

$498,792

1 distinct insiders

12-month sales

$44,297,342

6 distinct insiders

Highlighted alerts

1

99 Rule 10b5-1 trades treated as informational

Buying cluster · 30 days

Fewer than three distinct buyers

CEO/CFO purchases · 12 months

No executive purchases found

Get DUOL insider trades by API

The same filtered trades as JSON for your scripts, alerts or AI agent, for 5,500+ US companies — plus sentiment, news, financials and breakout setups. Free · every API · 1,000 requests a month · no card required.

Get your free API key

DUOL overview: breakout setup, X sentiment and insiders in one page →

Form 4 raw → Raspberry

The value is in what we do not call a signal.

The SEC XML stores every transaction. Raspberry keeps that evidence, reads the footnotes and separates voluntary open-market activity from vesting, option exercises, gifts, tax withholding, stock purchase and dividend reinvestment plans and pre-programmed 10b5-1 trades.

100
Raw transactions
Everything returned by the filing
100
Voluntary view
P/S trades after deterministic checks
50
Administrative noise
Stored, never alerted
60
10b5-1
Shown as informational
SEC ownership XML facts
Code
S
Shares
2,751
Price
$129.13
Footnotes
4

Represents shares automatically sold to satisfy tax withholding obligations in connection with the vesting of restricted stock units and delivery of shares. The sale was effected pursuant to the Reporting Person's Rule 10b5-1 trading plan adopted on September 15, 2025. The price reported in Column 4 is a weighted average sale price calculated by the broker executing the sales. These shares were sold in multiple transactions at prices ranging from $136.68 to $137.61, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote. The price reported in Column 4 is a weighted average sale price calculated by the broker executing the sales. These shares were sold in multiple transactions at prices ranging from $137.72 to $138.59, inclusive. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares sold at each respective price within the range set forth in this footnote.

Raspberry interpretation
Informational — no alert

Reason: tax_withholding. The filing footnotes identify tax withholding. The trade is reported under a Rule 10b5-1 plan.

Verify in SEC EDGAR

Recent transactions

Voluntary purchases and sales; administrative noise stays hidden.

100 transactions

von Ahn Luis

President & CEO, Co-Founder

Sale 10b5-1
Shares
5,114
Price
$153.26
Value
$783,777
Open SEC filing

von Ahn Luis

President & CEO, Co-Founder

Sale 10b5-1
Shares
29,871
Price
$152.47
Value
$4,554,533
Open SEC filing

von Ahn Luis

President & CEO, Co-Founder

Sale 10b5-1
Shares
55,036
Price
$151.52
Value
$8,339,286
Open SEC filing

von Ahn Luis

President & CEO, Co-Founder

Sale 10b5-1
Shares
20,025
Price
$150.63
Value
$3,016,404
Open SEC filing

von Ahn Luis

President & CEO, Co-Founder

Sale 10b5-1
Shares
900
Price
$152.29
Value
$137,061
Open SEC filing

von Ahn Luis

President & CEO, Co-Founder

Sale 10b5-1
Shares
7,024
Price
$151.42
Value
$1,063,588
Open SEC filing

von Ahn Luis

President & CEO, Co-Founder

Sale 10b5-1
Shares
38,758
Price
$150.45
Value
$5,831,145
Open SEC filing

von Ahn Luis

President & CEO, Co-Founder

Sale 10b5-1
Shares
3,414
Price
$152.02
Value
$518,996
Open SEC filing

von Ahn Luis

President & CEO, Co-Founder

Sale 10b5-1
Shares
200
Price
$150.00
Value
$30,000
Open SEC filing

von Ahn Luis

President & CEO, Co-Founder

Sale 10b5-1
Shares
4,109
Price
$151.07
Value
$620,746
Open SEC filing

von Ahn Luis

President & CEO, Co-Founder

Sale 10b5-1
Shares
33,257
Price
$150.46
Value
$5,003,985
Open SEC filing

von Ahn Luis

President & CEO, Co-Founder

Sale 10b5-1
Shares
1,020
Price
$151.54
Value
$154,571
Open SEC filing

von Ahn Luis

President & CEO, Co-Founder

Sale 10b5-1
Shares
27,272
Price
$150.17
Value
$4,095,570
Open SEC filing

Chen Stephen C.

General Counsel

Sale 10b5-1
Shares
5,965
Price
$150.00
Value
$894,750
Open SEC filing

Chen Stephen C.

General Counsel

Sale 10b5-1
Shares
2,107
Price
$147.43
Value
$310,635
Open SEC filing

GORDON WILLIAM B

Director

Sale 10b5-1
Shares
100
Price
$151.64
Value
$15,164
Open SEC filing

GORDON WILLIAM B

Director

Sale 10b5-1
Shares
200
Price
$148.68
Value
$29,735
Open SEC filing

GORDON WILLIAM B

Director

Sale 10b5-1
Shares
2,675
Price
$146.58
Value
$392,114
Open SEC filing

GORDON WILLIAM B

Director

Sale 10b5-1
Shares
3,483
Price
$145.91
Value
$508,198
Open SEC filing

GORDON WILLIAM B

Director

Sale 10b5-1
Shares
2,742
Price
$144.59
Value
$396,458
Open SEC filing

GORDON WILLIAM B

Director

Sale 10b5-1
Shares
800
Price
$143.83
Value
$115,068
Open SEC filing

Glance Natalie

Chief Engineering Officer

Sale 10b5-1
Shares
1,037
Price
$138.19
Value
$143,300
Open SEC filing

Glance Natalie

Chief Engineering Officer

Sale 10b5-1
Shares
502
Price
$137.01
Value
$68,779
Open SEC filing

Chen Stephen C.

General Counsel

Sale 10b5-1
Shares
700
Price
$114.22
Value
$79,955
Open SEC filing

Chen Stephen C.

General Counsel

Sale 10b5-1
Shares
1,277
Price
$113.27
Value
$144,648
Open SEC filing

Glance Natalie

Chief Engineering Officer

Sale 10b5-1
Shares
1,300
Price
$114.19
Value
$148,441
Open SEC filing

Glance Natalie

Chief Engineering Officer

Sale 10b5-1
Shares
2,060
Price
$113.21
Value
$233,215
Open SEC filing

Shelton James H

Director

PurchaseAlert
Shares
5,000
Price
$99.76
Value
$498,792
Open SEC filing

Skaruppa Matthew

Chief Financial Officer

Sale 10b5-1
Shares
360
Price
$115.29
Value
$41,503
Open SEC filing

Skaruppa Matthew

Chief Financial Officer

Sale 10b5-1
Shares
1,764
Price
$114.35
Value
$201,705
Open SEC filing

Skaruppa Matthew

Chief Financial Officer

Sale 10b5-1
Shares
236
Price
$113.37
Value
$26,755
Open SEC filing

Skaruppa Matthew

Chief Financial Officer

Sale 10b5-1
Shares
1,626
Price
$112.26
Value
$182,529
Open SEC filing

Chen Stephen C.

General Counsel

Sale 10b5-1
Shares
80
Price
$115.47
Value
$9,238
Open SEC filing

Chen Stephen C.

General Counsel

Sale 10b5-1
Shares
520
Price
$114.55
Value
$59,567
Open SEC filing

Chen Stephen C.

General Counsel

Sale 10b5-1
Shares
480
Price
$113.95
Value
$54,696
Open SEC filing

Chen Stephen C.

General Counsel

Sale 10b5-1
Shares
821
Price
$111.83
Value
$91,812
Open SEC filing

Glance Natalie

Chief Engineering Officer

Sale 10b5-1
Shares
360
Price
$115.29
Value
$41,504
Open SEC filing

Glance Natalie

Chief Engineering Officer

Sale 10b5-1
Shares
1,520
Price
$114.29
Value
$173,719
Open SEC filing

Glance Natalie

Chief Engineering Officer

Sale 10b5-1
Shares
166
Price
$113.55
Value
$18,849
Open SEC filing

Glance Natalie

Chief Engineering Officer

Sale 10b5-1
Shares
1,499
Price
$112.30
Value
$168,332
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
280
Price
$176.68
Value
$49,471
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
435
Price
$175.46
Value
$76,324
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
3,089
Price
$174.61
Value
$539,362
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
760
Price
$173.74
Value
$132,046
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,281
Price
$172.39
Value
$220,831
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
2,009
Price
$171.50
Value
$344,534
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,000
Price
$170.55
Value
$170,549
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,146
Price
$169.57
Value
$194,324
Open SEC filing

Chen Stephen C.

General Counsel

Sale 10b5-1
Shares
480
Price
$177.19
Value
$85,049
Open SEC filing

Chen Stephen C.

General Counsel

Sale 10b5-1
Shares
320
Price
$175.94
Value
$56,300
Open SEC filing

Chen Stephen C.

General Counsel

Sale 10b5-1
Shares
594
Price
$175.15
Value
$104,040
Open SEC filing

Chen Stephen C.

General Counsel

Sale 10b5-1
Shares
120
Price
$173.97
Value
$20,876
Open SEC filing

Skaruppa Matthew

Chief Financial Officer

Sale 10b5-1
Shares
200
Price
$177.65
Value
$35,530
Open SEC filing

Skaruppa Matthew

Chief Financial Officer

Sale 10b5-1
Shares
796
Price
$176.91
Value
$140,819
Open SEC filing

Skaruppa Matthew

Chief Financial Officer

Sale 10b5-1
Shares
880
Price
$175.73
Value
$154,643
Open SEC filing

Skaruppa Matthew

Chief Financial Officer

Sale 10b5-1
Shares
793
Price
$175.00
Value
$138,776
Open SEC filing

Skaruppa Matthew

Chief Financial Officer

Sale 10b5-1
Shares
390
Price
$174.04
Value
$67,874
Open SEC filing

Glance Natalie

Chief Engineering Officer

Sale 10b5-1
Shares
160
Price
$177.60
Value
$28,416
Open SEC filing

Glance Natalie

Chief Engineering Officer

Sale 10b5-1
Shares
560
Price
$177.00
Value
$99,118
Open SEC filing

Glance Natalie

Chief Engineering Officer

Sale 10b5-1
Shares
850
Price
$175.73
Value
$149,372
Open SEC filing

Glance Natalie

Chief Engineering Officer

Sale 10b5-1
Shares
741
Price
$174.97
Value
$129,652
Open SEC filing

Glance Natalie

Chief Engineering Officer

Sale 10b5-1
Shares
160
Price
$173.80
Value
$27,808
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,727
Price
$266.12
Value
$459,594
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
760
Price
$265.02
Value
$201,412
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,625
Price
$264.06
Value
$429,098
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
560
Price
$262.97
Value
$147,265
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,778
Price
$261.94
Value
$465,736
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
165
Price
$261.14
Value
$43,088
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
560
Price
$259.71
Value
$145,436
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
936
Price
$258.77
Value
$242,213
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,145
Price
$266.87
Value
$305,564
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
744
Price
$257.92
Value
$191,892
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,600
Price
$316.64
Value
$506,617
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,100
Price
$315.79
Value
$347,365
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
500
Price
$313.93
Value
$156,967
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,281
Price
$312.37
Value
$400,152
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,000
Price
$311.43
Value
$311,428
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
632
Price
$309.94
Value
$195,882
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
500
Price
$309.06
Value
$154,532
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
600
Price
$307.55
Value
$184,532
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
100
Price
$324.10
Value
$32,410
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
300
Price
$323.09
Value
$96,927
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
400
Price
$321.75
Value
$128,699
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
300
Price
$319.97
Value
$95,991
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
907
Price
$318.73
Value
$289,085
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
680
Price
$317.68
Value
$216,025
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
100
Price
$305.86
Value
$30,586
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
600
Price
$326.50
Value
$195,897
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
500
Price
$325.22
Value
$162,612
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
300
Price
$324.10
Value
$97,231
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
109
Price
$322.62
Value
$35,166
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,173
Price
$321.39
Value
$376,991
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,803
Price
$320.33
Value
$577,560
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,599
Price
$319.56
Value
$510,972
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,916
Price
$318.26
Value
$609,794
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
200
Price
$328.76
Value
$65,751
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
1,300
Price
$327.44
Value
$425,675
Open SEC filing

Hacker Severin

Chief Tech Officer, Co-Founder

Sale 10b5-1
Shares
500
Price
$317.31
Value
$158,653
Open SEC filing

Glance Natalie

Chief Engineering Officer

Sale 10b5-1
Shares
600
Price
$319.76
Value
$191,854
Open SEC filing

Glance Natalie

Chief Engineering Officer

Sale 10b5-1
Shares
600
Price
$317.96
Value
$190,773
Open SEC filing

“Alert” means a voluntary, unscheduled transaction according to the filing; it is not an investment recommendation. Official source: SEC EDGAR.