DUOL SEC Filing News — Duolingo, Inc.

Latest SEC filings for Duolingo, Inc. (DUOL) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-10-13.

Duolingo, Inc. operates as a mobile learning platform in the United States, the United Kingdom, and internationally. The company offers 250 language courses, including Spanish, English, French, German, Italian, Portuguese, Japanese, and Chinese through its Duolingo app. It also provides a digital English language proficiency assessment exam. The company was incorporated in 2011 and is headquartered in Pittsburgh, Pennsylvania.
Sector: Technology Industry: Software - Application Market Cap: $6.6B CIK: 1562088
20
Total Filings
0
Bullish Classifications
10
Bearish Classifications
11
Insider Transactions
0
Material Events (8-K)
0
Periodic Reports
Rule-based classifications for DUOL currently lean bearish. Of the 20 filing records displayed, 10 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.
DUOL Filing Activity Snapshot 2026-08-19 — 2026-10-13
Insider Transactions (Form 4)
0 buys vs 7 sells
Net insider selling in this period — insiders sell for many reasons beyond conviction.
Largest Form 144 Filing
$16.69M
von Ahn Luis (Director, President & CEO, Co-Founder, 10% Owner) · 2026-10-09
110,046 shares · Form 4
Form 144 Notices
9
Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.
Insider Transactions 11 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 11 filings in this group are Form 4s for Duolingo, Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 11 insider filings shown, the breakdown is 7 open-market sale and 4 compensation award. 7 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Open-market sale ×7
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Compensation award ×4
Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.
Form 4 Compensation award Tax / Compensation Filing 2026-10-13

DUOL insider Form 4 filed for equity award, exercise, or tax withholding

Shelton James H (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award 100 $149.92 $15.0K
Filing: Form 4 (Insider Transaction) Insider: Shelton James H (Director) Shares: 100
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-10-13

DUOL insider Form 4 filed for equity award, exercise, or tax withholding

Schlosser Mario (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award 116 $149.92 $17.4K
Filing: Form 4 (Insider Transaction) Insider: Schlosser Mario (Director) Shares: 116
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-10-13

DUOL insider Form 4 filed for equity award, exercise, or tax withholding

Lilly III John Osborne (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award 98 $149.92 $14.7K
Filing: Form 4 (Insider Transaction) Insider: Lilly III John Osborne (Director) Shares: 98
View on SEC EDGAR → Open Filing Document →
Form 4 Compensation award Tax / Compensation Filing 2026-10-13

DUOL insider Form 4 filed for equity award, exercise, or tax withholding

Bohutinsky Amy (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code Nature Shares Price Value
A Compensation award 108 $149.92 $16.2K
Filing: Form 4 (Insider Transaction) Insider: Bohutinsky Amy (Director) Shares: 108
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-10-09

DUOL insider von Ahn Luis (Director, President & CEO, Co-Founder, 10% Owner) sold 110,046 shares (~$16.69M)

von Ahn Luis, listed as Director, President & CEO, Co-Founder, 10% Owner at Duolingo, Inc., reported an open-market sale of 110,046 DUOL shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
C Derivative conversion 110,046 $38.08 $4.19M
S Open-market sale 20,025 $150.63 $3.02M
S Open-market sale 55,036 $151.52 $8.34M
S Open-market sale 29,871 $152.47 $4.55M
S Open-market sale 5,114 $153.26 $783.8K
M Option exercise derivative · Stock Option (Right to Buy) 110,046 — —
C Derivative conversion derivative · Class B Common Stock 110,046 — —
C Derivative conversion derivative · Class B Common Stock 110,046 — —
Filing: Form 4 (Insider Transaction) Insider: von Ahn Luis (Director, President & CEO, Co-Founder, 10% Owner) Shares: 110,046 Est. Value: $16.69M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-28

DUOL insider von Ahn Luis (Director, President & CEO, Co-Founder, 10% Owner) sold 46,682 shares (~$7.03M)

von Ahn Luis, listed as Director, President & CEO, Co-Founder, 10% Owner at Duolingo, Inc., reported an open-market sale of 46,682 DUOL shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
C Derivative conversion 46,682 $38.08 $1.78M
S Open-market sale 38,758 $150.45 $5.83M
S Open-market sale 7,024 $151.42 $1.06M
S Open-market sale 900 $152.29 $137.1K
M Option exercise derivative · Stock Option (Right to Buy) 46,682 — —
C Derivative conversion derivative · Class B Common Stock 46,682 — —
C Derivative conversion derivative · Class B Common Stock 46,682 — —
Filing: Form 4 (Insider Transaction) Insider: von Ahn Luis (Director, President & CEO, Co-Founder, 10% Owner) Shares: 46,682 Est. Value: $7.03M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-23

DUOL insider von Ahn Luis (Director, President & CEO, Co-Founder, 10% Owner) sold 40,980 shares (~$6.17M)

von Ahn Luis, listed as Director, President & CEO, Co-Founder, 10% Owner at Duolingo, Inc., reported an open-market sale of 40,980 DUOL shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
C Derivative conversion 27,960 $14.42 $403.2K
C Derivative conversion 9,406 $38.08 $358.2K
S Open-market sale 33,257 $150.46 $5.00M
S Open-market sale 4,109 $151.07 $620.7K
C Derivative conversion 3,614 $38.08 $137.6K
S Open-market sale 200 $150.00 $30.0K
S Open-market sale 3,414 $152.02 $519.0K
M Option exercise derivative · Stock Option (Right to Buy) 27,960 — —
C Derivative conversion derivative · Class B Common Stock 27,960 — —
C Derivative conversion derivative · Class B Common Stock 27,960 — —
M Option exercise derivative · Stock Option (Right to Buy) 9,406 — —
C Derivative conversion derivative · Class B Common Stock 9,406 — —
C Derivative conversion derivative · Class B Common Stock 9,406 — —
M Option exercise derivative · Stock Option (Right to Buy) 3,614 — —
C Derivative conversion derivative · Class B Common Stock 3,614 — —
C Derivative conversion derivative · Class B Common Stock 3,614 — —
Filing: Form 4 (Insider Transaction) Insider: von Ahn Luis (Director, President & CEO, Co-Founder, 10% Owner) Shares: 40,980 Est. Value: $6.17M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-18

DUOL insider von Ahn Luis (Director, President & CEO, Co-Founder, 10% Owner) sold 28,292 shares (~$4.25M)

von Ahn Luis, listed as Director, President & CEO, Co-Founder, 10% Owner at Duolingo, Inc., reported an open-market sale of 28,292 DUOL shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
C Derivative conversion 23,040 $14.42 $332.2K
C Derivative conversion 5,252 $38.08 $200.0K
S Open-market sale 27,272 $150.17 $4.10M
S Open-market sale 1,020 $151.54 $154.6K
M Option exercise derivative · Stock Option (Right to Buy) 23,040 — —
C Derivative conversion derivative · Class B Common Stock 23,040 — —
C Derivative conversion derivative · Class B Common Stock 23,040 — —
M Option exercise derivative · Stock Option (Right to Buy) 5,252 — —
C Derivative conversion derivative · Class B Common Stock 5,252 — —
C Derivative conversion derivative · Class B Common Stock 5,252 — —
Filing: Form 4 (Insider Transaction) Insider: von Ahn Luis (Director, President & CEO, Co-Founder, 10% Owner) Shares: 28,292 Est. Value: $4.25M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-15

DUOL insider Chen Stephen C. (General Counsel) sold 8,072 shares (~$1.21M)

Chen Stephen C., listed as General Counsel at Duolingo, Inc., reported an open-market sale of 8,072 DUOL shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 2,107 $147.43 $310.6K
S Open-market sale 5,965 $150.00 $894.8K
Filing: Form 4 (Insider Transaction) Insider: Chen Stephen C. (General Counsel) Shares: 8,072 Est. Value: $1.21M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-09-10

DUOL insider GORDON WILLIAM B (Director) sold 10,000 shares (~$1.46M)

GORDON WILLIAM B, listed as Director at Duolingo, Inc., reported an open-market sale of 10,000 DUOL shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 800 $143.83 $115.1K
S Open-market sale 2,742 $144.59 $396.5K
S Open-market sale 3,483 $145.91 $508.2K
S Open-market sale 2,675 $146.58 $392.1K
S Open-market sale 200 $148.68 $29.7K
S Open-market sale 100 $151.64 $15.2K
Filing: Form 4 (Insider Transaction) Insider: GORDON WILLIAM B (Director) Shares: 10,000 Est. Value: $1.46M
View on SEC EDGAR → Open Filing Document →
Form 4 Open-market sale Insider Selling 2026-08-19

DUOL insider Glance Natalie (Chief Engineering Officer) sold 4,290 shares (~$567.3K)

Glance Natalie, listed as Chief Engineering Officer at Duolingo, Inc., reported an open-market sale of 4,290 DUOL shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 2,751 $129.13 $355.2K
S Open-market sale 502 $137.01 $68.8K
S Open-market sale 1,037 $138.19 $143.3K
Filing: Form 4 (Insider Transaction) Insider: Glance Natalie (Chief Engineering Officer) Shares: 4,290 Est. Value: $567.3K
View on SEC EDGAR → Open Filing Document →
Proposed Insider Sales 9 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. Duolingo, Inc. has 9 such notices in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Large Proposed Insider Sale 2026-10-07

DUOL Form 144 filed for proposed insider sale by LUIS VON AHN ARELLANO (110,046 shares) ~$16.30M

LUIS VON AHN ARELLANO filed a Form 144 with the SEC indicating intent to sell DUOL (Duolingo, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4. The proposed dollar value is large enough to merit attention.

Filing: Form 144 (Proposed Sale Notice) Insider: LUIS VON AHN ARELLANO Shares: 110,046 Est. Value: $16.30M
View on SEC EDGAR → Open Filing Document →
Form 144 Large Proposed Insider Sale 2026-09-24

DUOL Form 144 filed for proposed insider sale by LUIS VON AHN ARELLANO (46,682 shares) ~$6.81M

LUIS VON AHN ARELLANO filed a Form 144 with the SEC indicating intent to sell DUOL (Duolingo, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4. The proposed dollar value is large enough to merit attention.

Filing: Form 144 (Proposed Sale Notice) Insider: LUIS VON AHN ARELLANO Shares: 46,682 Est. Value: $6.81M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-22

DUOL Form 144 filed for proposed insider sale by LUIS VON AHN ARELLANO (3,614 shares) ~$540.0K

LUIS VON AHN ARELLANO filed a Form 144 with the SEC indicating intent to sell DUOL (Duolingo, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: LUIS VON AHN ARELLANO Shares: 3,614 Est. Value: $540.0K
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-21

DUOL Form 144 filed for proposed insider sale by LUIS VON AHN FOUNDATION (34,992 shares) ~$4.97M

LUIS VON AHN FOUNDATION filed a Form 144 with the SEC indicating intent to sell DUOL (Duolingo, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: LUIS VON AHN FOUNDATION Shares: 34,992 Est. Value: $4.97M
View on SEC EDGAR → Open Filing Document →
Form 144 Large Proposed Insider Sale 2026-09-21

DUOL Form 144 filed for proposed insider sale by LUIS VON AHN ARELLANO (37,366 shares) ~$5.30M

LUIS VON AHN ARELLANO filed a Form 144 with the SEC indicating intent to sell DUOL (Duolingo, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4. The proposed dollar value is large enough to merit attention.

Filing: Form 144 (Proposed Sale Notice) Insider: LUIS VON AHN ARELLANO Shares: 37,366 Est. Value: $5.30M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-16

DUOL Form 144 filed for proposed insider sale by LUIS VON AHN ARELLANO (28,292 shares) ~$4.35M

LUIS VON AHN ARELLANO filed a Form 144 with the SEC indicating intent to sell DUOL (Duolingo, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: LUIS VON AHN ARELLANO Shares: 28,292 Est. Value: $4.35M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-16

DUOL Form 144 filed for proposed insider sale by LUIS VON AHN FOUNDATION (19,008 shares) ~$2.93M

LUIS VON AHN FOUNDATION filed a Form 144 with the SEC indicating intent to sell DUOL (Duolingo, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: LUIS VON AHN FOUNDATION Shares: 19,008 Est. Value: $2.93M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-14

DUOL Form 144 filed for proposed insider sale by STEPHEN CHEN (8,072 shares) ~$1.16M

STEPHEN CHEN filed a Form 144 with the SEC indicating intent to sell DUOL (Duolingo, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: STEPHEN CHEN Shares: 8,072 Est. Value: $1.16M
View on SEC EDGAR → Open Filing Document →
Form 144 Proposed Insider Sale 2026-09-08

DUOL Form 144 filed for proposed insider sale by WILLIAM B. GORDON (20,000 shares) ~$3.09M

WILLIAM B. GORDON filed a Form 144 with the SEC indicating intent to sell DUOL (Duolingo, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: WILLIAM B. GORDON Shares: 20,000 Est. Value: $3.09M
View on SEC EDGAR → Open Filing Document →

How we classify Duolingo, Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on DUOL. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — DUOL SEC Filings

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Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.
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