| James H. Shelton |
DUOL |
Class A Common Stock |
Purchase |
107.9% |
$498,792 |
$99.76 |
5,000 |
9,632 |
03 Mar 2026 |
Direct |
| Natalie Glance |
DUOL |
Class A Common Stock |
Options Exercise |
21% |
|
|
24,252 |
139,632 |
27 Feb 2026 |
Direct |
| Natalie Glance |
DUOL |
Stock Option (Right to Buy) |
Options Exercise |
-100% |
|
|
-24,252 |
0 |
27 Feb 2026 |
Direct |
| Matthew Skaruppa |
DUOL |
Class A Common Stock |
Sale |
-11.2% |
$452,492 |
$113.52 |
-3,986 |
31,631 |
18 Feb 2026 |
Direct |
| Stephen C. Chen |
DUOL |
Class A Common Stock |
Sale |
-5.86% |
$215,313 |
$113.26 |
-1,901 |
30,545 |
18 Feb 2026 |
Direct |
| Natalie Glance |
DUOL |
Class A Common Stock |
Sale |
-2.98% |
$402,403 |
$113.51 |
-3,545 |
115,380 |
18 Feb 2026 |
Direct |
| Robert Meese |
DUOL |
Class A Common Stock |
Sale |
-0.81% |
$110,060 |
$110.06 |
-1,000 |
122,636 |
17 Feb 2026 |
Direct |
| Matthew Skaruppa |
DUOL |
Class A Common Stock |
Sale |
-4.99% |
$205,812 |
$110.06 |
-1,870 |
35,617 |
17 Feb 2026 |
Direct |
| Stephen C. Chen |
DUOL |
Class A Common Stock |
Sale |
-2.69% |
$98,614 |
$110.06 |
-896 |
32,446 |
17 Feb 2026 |
Direct |
| Natalie Glance |
DUOL |
Class A Common Stock |
Sale |
-1.44% |
$191,614 |
$110.06 |
-1,741 |
118,925 |
17 Feb 2026 |
Direct |
| Severin Hacker |
DUOL |
Class B Common Stock |
Tax liability |
-14.7% |
|
|
-30,594 |
177,193 |
17 Feb 2026 |
Direct |
| Severin Hacker |
DUOL |
Class B Common Stock |
Options Exercise |
40.6% |
|
|
60,000 |
207,787 |
17 Feb 2026 |
Direct |
| Severin Hacker |
DUOL |
Performance-Based Restricted Stock Units |
Options Exercise |
-18.2% |
|
|
-60,000 |
270,000 |
17 Feb 2026 |
Direct |
| Luis von Ahn |
DUOL |
Class B Common Stock |
Tax liability |
-1.57% |
|
|
-53,640 |
3,352,995 |
17 Feb 2026 |
Direct |
| Luis von Ahn |
DUOL |
Class B Common Stock |
Options Exercise |
3.65% |
|
|
120,000 |
3,406,635 |
17 Feb 2026 |
Direct |
| Luis von Ahn |
DUOL |
Performance-Based Restricted Stock Units |
Options Exercise |
-18.2% |
|
|
-120,000 |
540,000 |
17 Feb 2026 |
Direct |
| Stephen C. Chen |
DUOL |
Class A Common Stock |
Options Exercise |
5.71% |
|
|
1,800 |
33,342 |
29 Dec 2025 |
Direct |
| Stephen C. Chen |
DUOL |
Stock Option (Right to Buy) |
Options Exercise |
-71.8% |
|
|
-1,800 |
706 |
29 Dec 2025 |
Direct |
| Severin Hacker |
DUOL |
Class A Common Stock |
Gift |
-99.9% |
|
|
-50,000 |
72 |
08 Dec 2025 |
Direct |
| Severin Hacker |
DUOL |
Class A Common Stock |
Conversion of derivative security |
69444.4% |
|
|
50,000 |
50,072 |
08 Dec 2025 |
Direct |
| Severin Hacker |
DUOL |
Class B Common Stock |
Conversion of derivative security |
-1.73% |
|
|
-50,000 |
2,836,917 |
08 Dec 2025 |
See footnote |
| Natalie Glance |
DUOL |
Class A Common Stock |
Options Exercise |
8.55% |
|
|
9,500 |
120,666 |
05 Dec 2025 |
Direct |
| Natalie Glance |
DUOL |
Stock Option (Right to Buy) |
Options Exercise |
-44.5% |
|
|
-9,500 |
11,834 |
05 Dec 2025 |
Direct |
| Severin Hacker |
DUOL |
Class B Common Stock |
Options Exercise |
3.68% |
|
|
5,252 |
147,787 |
03 Dec 2025 |
Direct |
| Severin Hacker |
DUOL |
Stock Option (Right to Buy) |
Options Exercise |
-100% |
|
|
-5,252 |
0 |
03 Dec 2025 |
Direct |
| Severin Hacker |
DUOL |
Class B Common Stock |
Tax liability |
-18.2% |
|
|
-31,770 |
142,535 |
01 Dec 2025 |
Direct |
| Severin Hacker |
DUOL |
Class B Common Stock |
Options Exercise |
52.5% |
|
|
60,000 |
174,305 |
01 Dec 2025 |
Direct |
| Severin Hacker |
DUOL |
Performance-Based Restricted Stock Units |
Options Exercise |
-15.4% |
|
|
-60,000 |
330,000 |
01 Dec 2025 |
Direct |
| Luis von Ahn |
DUOL |
Class B Common Stock |
Tax liability |
-1.55% |
|
|
-51,768 |
3,286,635 |
01 Dec 2025 |
Direct |
| Luis von Ahn |
DUOL |
Class B Common Stock |
Options Exercise |
3.73% |
|
|
120,000 |
3,338,403 |
01 Dec 2025 |
Direct |
| Luis von Ahn |
DUOL |
Performance-Based Restricted Stock Units |
Options Exercise |
-15.4% |
|
|
-120,000 |
660,000 |
01 Dec 2025 |
Direct |
| Severin Hacker |
DUOL |
Class A Common Stock |
Sale |
-99.3% |
$1,727,441 |
$172.74 |
-10,000 |
72 |
19 Nov 2025 |
Direct |
| Severin Hacker |
DUOL |
Class A Common Stock |
Conversion of derivative security |
13888.9% |
|
|
10,000 |
10,072 |
19 Nov 2025 |
Direct |
| Severin Hacker |
DUOL |
Class B Common Stock |
Conversion of derivative security |
-8.04% |
|
|
-10,000 |
114,305 |
19 Nov 2025 |
Direct |
| Severin Hacker |
DUOL |
Class B Common Stock |
Conversion of derivative security |
8.75% |
|
|
10,000 |
124,305 |
19 Nov 2025 |
Direct |
| Severin Hacker |
DUOL |
Stock Option (Right to Buy) |
Options Exercise |
-65.6% |
|
|
-10,000 |
5,252 |
19 Nov 2025 |
Direct |
| Stephen C. Chen |
DUOL |
Class A Common Stock |
Sale |
-4.58% |
$266,265 |
$175.87 |
-1,514 |
31,542 |
18 Nov 2025 |
Direct |
| Matthew Skaruppa |
DUOL |
Class A Common Stock |
Sale |
-7.54% |
$537,643 |
$175.76 |
-3,059 |
37,487 |
18 Nov 2025 |
Direct |
| Natalie Glance |
DUOL |
Class A Common Stock |
Sale |
-2.17% |
$434,366 |
$175.79 |
-2,471 |
111,166 |
18 Nov 2025 |
Direct |
| Stephen C. Chen |
DUOL |
Class A Common Stock |
Sale |
-3.73% |
$228,132 |
$177.95 |
-1,282 |
33,056 |
17 Nov 2025 |
Direct |
| Matthew Skaruppa |
DUOL |
Class A Common Stock |
Sale |
-6.46% |
$498,082 |
$177.95 |
-2,799 |
40,546 |
17 Nov 2025 |
Direct |
| Natalie Glance |
DUOL |
Class A Common Stock |
Sale |
-2.18% |
$450,925 |
$177.95 |
-2,534 |
113,637 |
17 Nov 2025 |
Direct |
| Robert Meese |
DUOL |
Class A Common Stock |
Sale |
-1.15% |
$256,960 |
$177.95 |
-1,444 |
123,636 |
17 Nov 2025 |
Direct |
| Severin Hacker |
DUOL |
Class A Common Stock |
Sale |
-99.3% |
$2,631,299 |
$263.13 |
-10,000 |
72 |
04 Nov 2025 |
Direct |
| Severin Hacker |
DUOL |
Class A Common Stock |
Conversion of derivative security |
13888.9% |
|
|
10,000 |
10,072 |
04 Nov 2025 |
Direct |
| Severin Hacker |
DUOL |
Class B Common Stock |
Conversion of derivative security |
-8.04% |
|
|
-10,000 |
114,305 |
04 Nov 2025 |
Direct |
| Severin Hacker |
DUOL |
Class B Common Stock |
Conversion of derivative security |
8.75% |
|
|
10,000 |
124,305 |
04 Nov 2025 |
Direct |
| Severin Hacker |
DUOL |
Stock Option (Right to Buy) |
Options Exercise |
-39.6% |
|
|
-10,000 |
15,252 |
04 Nov 2025 |
Direct |
| Severin Hacker |
DUOL |
Class A Common Stock |
Sale |
-99.3% |
$3,147,198 |
$314.72 |
-10,000 |
72 |
20 Oct 2025 |
Direct |
| Severin Hacker |
DUOL |
Class A Common Stock |
Conversion of derivative security |
13888.9% |
|
|
10,000 |
10,072 |
20 Oct 2025 |
Direct |