№ lp_2_3_12446
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Regulatory disclosure filing submitted to the United States Securities and Exchange Commission reporting changes in beneficial ownership of equity and derivative securities of Duolingo, Inc. by its Chief Technology Officer between December 1 and December 3, 2025.
Year:
2025
Country:
United States
City:
Washington, D.C.; Pittsburgh, PA
Type of Document:
Regulatory filing
Form:
SEC Form 4
Regulatory Authority:
United States Securities and Exchange Commission
Legal Basis:
Section 16(a) of the Securities Exchange Act of 1934; Section 30(h) of the Investment Company Act of 1940
OMB Number:
3235-0287
Reporting Person:
Severin Hacker
Title of Reporting Person:
Chief Tech Officer, Co-Founder
Issuer:
Duolingo, Inc.
Ticker Symbol:
DUOL
Date of Earliest Transaction:
12/01/2025
Filing Date:
12/03/2025
Securities Reported:
Class A Common Stock; Class B Common Stock; Performance-Based Restricted Stock Units; Stock Options
Place of Filing:
Washington, D.C.
Price: 8 / 10 USD
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Institution:
Montana State University
Project Duration:
Three years
Document Type:
Budget justification
Funding Context:
Federal research grant
Principal Investigator:
Dr. John Smith
Personnel:
Principal Investigator; Postdoctoral Associate; Graduate Student Research Assistant
Fringe Benefit Rates:
37% faculty and professional staff; 1% academic months students; 9% summer months students
Equipment:
Two slow-frame-rate infrared cameras with wide-angle lenses
Domestic Travel Locations:
San Francisco; Barrow
International Travel Locations:
Greenland; Yokohama
Conference:
AGU Conference; IGARSS Conference
Total Direct Costs:
$523,908
Total Indirect Costs:
$205,445
Total Project Costs:
$729,353.00
Document Type:
Weekly Teaching Plan
Subject:
Mathematics
Grade Level:
Primary School
Weeks Covered:
1–3
Content Areas:
Counting; Number Names and Symbols; Place Value; Problem Solving; Mental Maths; Numbers, Operations and Relationships; Pattern, Functions and Algebra
Number Range:
0–160
Frequency:
Oral Daily; Written Daily; Written 1 per week
Instructional Format:
Whole Class Teaching; Small Group Teaching
Assessment Components:
Reflection; Support/Intervention
Activities Included:
Counting Objects; Addition and Subtraction; Multiplication; Division with Remainders; Money Problems; Geometric Patterns; Sudoku; Mental Maths
Referenced Material:
DBE textbook pages 28–31, 48–49, 68–69, 94–97
Responsible Staff:
Educator; HOD
Document Type:
Procurement self-declaration form
Subject:
Supplier selection and exclusion grounds
Legal Framework:
Public Contracts Regulations 2015
Applicable To:
Economic operators participating in public procurement procedures
Sections:
Part 1 (Potential Supplier Information); Part 2 (Exclusion Grounds); Part 3 (Supplier Selection Questions)
Related Instrument:
EU ESPD (Part III)
Issuing Body:
Contracting authority
Confidentiality Provision:
Disclosure limited to Cabinet Office and contracting authorities or as required by law
Sanctions for Misrepresentation:
Exclusion up to five years; contract rescission; damages; prosecution for fraud by false representation
Submission Requirement:
Completion of Parts 1 and 2 by all relied-upon organisations, including consortium members and relevant sub-contractors
Program:
Industrial Waste Program
Jurisdiction:
King County
Address:
201 S. Jackson Street, Suite 513, Seattle, WA 98104-3855
Contact:
Phone 206-477-5300; Fax 206-263-3001; Email [email protected]
Website:
www.kingcounty.gov/industrialwaste
Document Type:
Quarterly compliance monitoring report form
Reporting Period:
Quarter 1 (January–March); Quarter 2 (April–June); Quarter 3 (July–September)
Report Due Dates:
April 15; July 15; October 15 of each year
Measured Parameters:
pH (minimum and maximum); Settleable Solids (mL/L); Daily Flow (gallons per day)
Regulatory Reference:
Washington State Department of Ecology accredited laboratory requirement
Certification Requirement:
Signature of Principal Executive or Authorized Agent with date
Geographic Scope:
King County, Washington
Intended Submitters:
Permitted industrial facilities
Year:
2017
Season:
Growing Season
Program:
Corn Hybrid Testing Program
Zone Coverage:
Northern Counties (Zone 1); Central Counties (Zone 2); Southern Counties (Zone 3)
Counties:
Grand Forks County; Nelson County; Ramsey County; Marshall County, MN; Cass County; Traill County; Steele County; Ransom County; Richland County; Sargent County
Organization:
NDSU Extension Service Main Station
Crop:
Corn
Type of Document:
Agricultural field trial report
Data Included:
Planting and harvest dates; soil temperature at planting; seeding rate and final stand count; herbicide and fertilizer treatments; soil units; geographic coordinates; cooperator names; number of entries; trial average yield; agronomic observations
Yield Units:
bushels per acre (bu/ac)
Geographic Region:
North Dakota and Minnesota
Collaborators:
County cooperators and research stations
Year:
2014
Date of event:
1–3 December 2014
Date of report:
5 February 2015
Location:
Geneva
Document symbol:
A/HRC/FBHR/2014/3
Document type:
Summary report
Issuing body:
Human Rights Council
Related resolutions:
Human Rights Council resolutions 17/4 and 26/22
Prepared by:
Mo Ibrahim
Institutional framework:
Forum on Business and Human Rights guided by the Working Group on the issue of human rights and transnational corporations and other business enterprises
Theme:
Advancing business and human rights globally: alignment, adherence and accountability
Participation:
Approximately 2,000 participants from around 130 countries
Stakeholders:
States, United Nations entities, intergovernmental and regional organizations, national human rights institutions, business enterprises and associations, trade unions, academics, indigenous representatives, non-governmental organizations and affected stakeholders
Grade:
5th Grade
Subject:
English Language
Units:
Unit 1 Feelings; Unit 2 Things We Wear; Unit 3 Things We Do
Topics:
Personal questions; Ordinal numbers; Clothes vocabulary; Present continuous tense; Descriptive adjectives
Type of document:
Educational worksheet
Skills assessed:
Speaking; Writing; Reading comprehension; Vocabulary; Grammar
Activities included:
Answering questions; Multiple choice; Fill in the blanks; Matching; Rearranging sentences; True or False
Target learners:
Primary school students
Type:
Supplemental statistical tables
Methodology:
Hierarchical Linear Modeling (HLM)
Statistical Models:
Linear and quadratic growth models
Level 1 Variables:
Intercept, Time, Time × Time
Level 2 Variables:
Mothers’ BDI, Sex, Acceptance, Psychological Control, Firm Control
Outcome Variables:
Sad Mood, Anhedonia, Irritability, Sleep Problems, Fatigue, Appetite/Weight Changes, Psychomotor Disturbance, Concentration/Indecision, Low Self-Esteem/Guilt, Suicidal Ideation
Population:
Youth beginning in grade 6
Maternal Measure:
Beck Depression Inventory (BDI)
Sex Coding:
−.5 = boys, .5 = girls
Multiple Testing Correction:
Benjamini–Hochberg procedure
Reported Statistics:
Parameter estimates, standard errors, p-values, variance estimates, deviance statistics
Time Coding:
Intercept represents symptom level in grade 6
Year:
2022
Region:
Northern Ireland
Document Type:
Annual appraisal documentation pack
Subject:
General practitioner appraisal and revalidation
Target Audience:
General practitioners
Issuing Body:
Health and Social Care system in Northern Ireland
Related Regulation:
GMC Registration and Revalidation
Forms Included:
Form 1 Basic Details; Form 2 Current Medical Activities; Form 3 Material
Domains Covered:
Knowledge, Skills and Performance; Safety and Quality; Communication, Partnership and Teamwork; Maintaining Trust
Frequency:
Annual appraisal cycle
Supporting Evidence:
Personal Development Plan; Quality Improvement Activity; Significant Event Audit; Multi-source Feedback; Patient Survey; Health and Probity Declarations
Title:
Understanding Revelation: Chapters 1–3
Subject:
Biblical interpretation and eschatology
Biblical Focus:
Revelation 1–3
Related Scriptures:
Book of Revelation; New Testament; Micah; Isaiah
Doctrinal Themes:
Second Coming; Millennium; persecution; apostasy; redemption of Zion; New Jerusalem
Historical Context Discussed:
Reign of Domitian (A.D. 81–96); early Christian persecution in Asia Minor
Intended Audience:
Members of the Church; faithful Saints facing tribulation
Author:
Not specified
Referenced Figures:
John the Apostle; Jesus Christ
Geographical References:
Asia Minor
Religious Tradition:
Latter-day Saint (LDS) perspective
Type of Document:
Religious commentary and doctrinal exposition
Genre:
Fantasy
Form:
Film script
Structure:
Three-act structure
Primary Setting:
The White Throne and surrounding battlefield
Main Characters:
White Pawn; Black Queen; White King
Subject:
War between the White Kingdom and the Black Kingdom
Themes:
War; Destiny; Identity; Tragedy; Family revelation
Narrative Perspective:
Third-person stage directions with character dialogue
Language:
English with passages in Russian and Hindi
Estimated Period:
Fictional mythic setting
Year:
2026
Region / City:
United States
Topic:
Postdoctoral Residency Competencies in Health Service Psychology
Document Type:
Training and Evaluation Table
Organization:
Commission on Accreditation (CoA) / APA
Author:
Not specified
Target Audience:
Postdoctoral residency program directors and coordinators
Effective Period:
Ongoing for all residents enrolled
Approval Date:
Not specified
Reference Regulations:
Implementing Regulation C-9 P and C-16 P
Required Competencies:
Ethical and legal standards, Individual and cultural diversity, Integration of science and practice
Levels Covered:
Level 1 (Required), Level 2 (Program-Specific), Level 3 (Specialty Competencies)
Evaluation Methods:
Evaluation tools, minimum levels of achievement (MLAs), outcome measurements
Document type:
Supplementary statistical tables
Academic field:
Public Health / Pharmacy Practice
Research topic:
Responsible self-medication among pharmacy students
Statistical methods:
Bivariate and multivariate logistic regression analysis
Sample size:
428 students (Tables 1–2); 415 students (Table 3)
Population studied:
Pharmacy students
Variables analyzed:
Age, gender, pharmacy division, university/institute, location, marital status, accommodation, parents profession, medical illness
Outcome variables:
Good knowledge; positive attitudes; rational practices toward responsible self-medication
Institutions referenced:
Kampala International University; Mbarara University of Science and Technology; Makerere University
Statistical indicators:
COR (Crude Odds Ratio), AOR (Adjusted Odds Ratio), CI (Confidence Interval), P-value
Geographic context:
Uganda
Data presentation format:
Frequency distributions and regression coefficients
Purpose:
Examination of demographic and educational predictors associated with knowledge, attitudes, and practices related to responsible self-medication
Year:
Early Years Foundation Stage
Subjects:
Art, Design
Themes:
Drawing, Painting, Sculpture, 3D Art
Term 1 Focus:
Drawing Marvellous Marks
Term 2 Focus:
Paint my World
Term 3 Focus:
Sculpture and 3D: Creation Station
Learning Objectives:
Explore mark making, painting techniques, 3D modelling, textures, and patterns
Skills Developed:
Observation, creativity, fine motor control, colour recognition, material manipulation
Target Audience:
EYFS pupils
Educational Approach:
Experiential, hands-on exploration
Materials Used:
Pencils, chalk, paint, clay, natural objects, mixed media
Assessment Criteria:
Ability to create drawings, paintings, and 3D models using various techniques and materials
Year:
2026
Week of listing:
01/12/2026
Region / City:
Milwaukee, Wisconsin, USA
Country:
United States
Theme:
Residential rental housing listings
Document type:
Weekly rental availability list
Property types:
Studio apartments, 1-bedroom units, 2-bedroom units, 3-bedroom units
Rent range:
$600–$1450 per month
Organizations / Agencies:
Bieck Management LLC; Affordable Rentals; SUV Properties
Additional rental resources:
VineBrook Homes; Bieck Property Management; Bartsch Management LLC
Contact phone numbers:
414-961-7411; 414-643-5635; 414-431-3195; 855-513-5678; 414-961-7400; 414-763-7160
Addresses included:
Multiple residential addresses in Milwaukee, Wisconsin
Author / Compiler:
M.J.
Update status:
Created and updated by M.J.
Agency:
United States Securities and Exchange Commission
Form number:
Form 25
Document type:
Regulatory filing form
Jurisdiction:
United States
Legal basis:
Securities Exchange Act of 1934
Applicable rules:
Rule 12d2-2 (17 CFR 240.12d2-2); Rule 19d-1 (17 CFR 240.19d-1)
OMB control number:
3235-0080
OMB expiration date:
March 31, 2021
Filing system:
EDGAR
Effective delisting period:
10 days after filing
Effective withdrawal of registration period:
90 days after filing
Revision identifier:
SEC 1654 (03-06)
Year:
20__
Jurisdiction:
State of New York, USA
Document Type:
Bid Bond / Legal Agreement
Issuing Authority:
Office of General Services - Design & Construction
Parties Involved:
Principal (Contractor), Surety Company
Purpose:
Guarantee of contract execution and performance bonds
Notary Public Involvement:
Required for acknowledgment
Legal Reference:
Public Buildings Law, Sub. 3, Sec. 8
Note:
Date issued
Year:
2020
Region / city:
Great Britain
Topic:
Smart Metering, SEC Modifications, Technical Specifications
Document type:
Consultation paper
Organ / institution:
Data and Communications Company (DCC)
Author:
DCC
Target audience:
Industry professionals, technical users of the DUIS and MMC
Period of validity:
Until November 2020
Approval date:
28 April 2020
Amendment date:
Not specified
Date:
1 October 2020
Author:
[email protected]
Classification:
DCC Public
Note:
Region / City
Theme:
DCC User Interface, Smart Metering, SEC Release
Document Type:
Conclusions Document