Muji Pen Market Report: Sales Volume, Market Share, Leading Brands & Market Trends
Muji Pen sales on Amazon US totaled 179,000 units in July 2026 (▲ 14.7% vs. the prior month), generating an estimated $1,834,436 in revenue across the 50 top-ranked ASINs for this search term. Demand is heavily concentrated at the top of the ranking — the ten best performers capture 70.9% of unit volume and 69.2% of revenue, while a typical listing is priced at $10.47. The keyword itself pulled 49,436 Amazon queries over the same period (▲ 29.2% MoM).
Zooming out to the 12-month window ending July 2026, the muji pen Top 50 moved 2,004,300 units and $19,924,079 in cumulative sales — an average of 167,025 units and $1,660,340 per month. Monthly throughput topped out at 266,550 units in August 2025 and dipped to 104,050 in May 2026, leaving the latest reading 32.8% lower than August 2025.
Muji Pen Sales Trend (Trailing 12 Months)
Based on the top 50 ASINs by monthly sales for this keyword
2025/08
2025/09
2025/10
2025/11
2025/12
2026/01
2026/02
2026/03
2026/04
2026/05
2026/06
2026/07
Monthly Sales 2026/07
179K
▲ 14.7% MoM
Monthly Revenue 2026/07
$1.8M
▲ 21.2% MoM
Top 10 Market Share 2026/07
70.9%
Muji Pen Market Share & Sales Concentration on Amazon US — July 2026
The most-sold muji pen listing on Amazon US in July 2026 is ASIN B082PN4X5J (Brand: Sharpie), which sold 50,000 units at $11.99 apiece — equal to 27.9% of every unit tracked in this report and 2.5× the volume of the No. 2 listing.
The Top 10 ASINs account for 127,000 units and $1,270,150 in July 2026 — 70.9% of unit volume and 69.2% of revenue among all 50 ranked ASINs in this report.
Sales Volume of Top ASINs for 'Muji Pen' on Amazon
July 2026
Is 70.9% Top 10 share highly concentrated?
Ask AI to evaluate competition, market structure, and entry opportunities using ’s tracked Amazon sales, ranking, and keyword data.
Powered by ASINSIGHT MCP · Grounded in ASINSIGHT Amazon data
Top 5 Volume Share breakdown
B082PN4X5J
Sharpie Gel Gel Pens, Black Barrel, Medium Point (0.7mm), Black Gel Ink, 12 Count - Home, Office, School, Journaling, Writing, Note-Taking, Teacher Supplies
50K
▲ 25.0%vs. prior month
$599.5K
latest month
12-month trend
B0C9W8DD9S
Ddaowanx Gel Pens,6 Pcs 0.5mm Retractable Quick Dry Black Ink Pens | Fine Point Smooth Writing Pens for Nurses,Teachers,Cute Stationery Office&School Supplies,Gifts for Women
20K
▲ 0.0%vs. prior month
$170.8K
latest month
12-month trend
B019QBOFZO
Paper Mate InkJoy Gel Pens, Medium Point, 10 Count - Teacher Supplies, Writing, Journaling, Back to School
10K
▲ 0.0%vs. prior month
$99.7K
latest month
12-month trend
B0C23GQ4XT
SUNEE Cute Pencil Case, Aesthetic Pen Pouch, Colored Large Pencil Bag with Zipper, Kawaii Stationery Storage and Organizer, School Supplies for Teen and Adult Girls, Blue
10K
▲ 233.3%vs. prior month
$71.8K
latest month
12-month trend
B0008G8G8Y
Sakura Pigma Micron Fineliner Pens - Archival Black Ink Pens - Pens for Writing, Drawing, or Journaling - Assorted Point Sizes - 6 Pack
10K
▲ 0.0%vs. prior month
$123.6K
latest month
12-month trend
B0B45RTFQH
UIXJODO Gel Pens, 5 Pcs 0.5mm Black Ink Pens Fine Point Smooth Writing Pens, High-End Series Pens for Journaling Note Taking, Cute Office School Supplies Gifts for Women Men (Morandi)
8K
▲ 0.0%vs. prior month
$59.3K
latest month
12-month trend
Unlock to view all Top 50 ASIN competitors and their sales contributions
Best Muji Pen Brands on Amazon US — Top 3 Brand Sales Concentration (July 2026)
Sharpie is the best-performing muji pen brand in July 2026, moving 50,000 units across 1 ASIN for 39.4% of Top 10 volume. Ddaowanx follows with 20,000 units (15.7%), ahead of Uni-Ball on 11,000 units (8.7%).
With 9 brands splitting the Top 10 and 63.8% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $7.18 to $11.99, which frames the price band a competing listing has to justify.
Brand share of Top 10 volume
Sharpie
1 ASIN in Top 10
39.4%
Units
50K
Revenue
$599.5K
Avg. price
$11.99
B082PN4X5J
$11.99·★4.7·84.3K revsSharpie Gel Gel Pens, Black Barrel, Medium Point (0.7mm), Black Gel Ink, 12 Count - Home, Office, School, Journaling, Writing, Note-Taking, Teacher Supplies
Units sold50K
Ddaowanx
1 ASIN in Top 10
15.7%
Units
20K
Revenue
$170.8K
Avg. price
$7.99
B0C9W8DD9S
$7.99·★4.6·9.2K revsDdaowanx Gel Pens,6 Pcs 0.5mm Retractable Quick Dry Black Ink Pens | Fine Point Smooth Writing Pens for Nurses,Teachers,Cute Stationery Office&School Supplies,Gifts for Women
Units sold20K
Uni-Ball
2 ASINs in Top 10
8.7%
Units
11K
Revenue
$75.3K
Avg. price
$7.18
B0DLX3SYLP
$6.89·★4.7·3.4K revsuniball™ Zento Gel Pens, Black Ink, 0.7mm Medium Point, 4 Count | Retractable, Smooth Writing, Quick-Drying, No Smear, No Bleed, Muted Barrel Colors
Units sold7KB0012YVR1O
$7.47·★4.7·15K revsUni-Ball Vision Stick Roller Ball Pens, Fine Point, Black Ink, Pack of 4
Units sold4K
Trending Muji Pen Products — Growth Leaders & New Top 10 Entrants
Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, 2 ASINs forced its way in: B0C23GQ4XT booked 10K units at $11.99, with ▲ 233.3% MoM change. On the growth side, B0DPN3WQCR leads positive momentum with ▲ 500.0% MoM growth on 300 units.
The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.
B0C23GQ4XT
SUNEE Cute Pencil Case, Aesthetic Pen Pouch, Colored Large Pencil Bag with Zipper, Kawaii Stationery Storage and Organizer, School Supplies for Teen and Adult Girls, Blue
Price
$11.99
Rating
4.5
Reviews
2.7K
Latest month sales
B0F4X8NR2M
Hiacry 8 Pack Gel Pens, Quick-Drying Black Ink, 0.7mm Fine Point Fidget Pen | Smooth Long-Lasting Ink Pens, Stress Relief , No Smear, No Bleed, Journaling, Note Taking ,School Office, Gifts for Men Women
Price
$8.09
Rating
4.6
Reviews
2.4K
Latest month sales
B0DPN3WQCR
10PCs Pastel Gel Ink Pen Set,Retractable Black Ink Pens 0.5mm Fine Point | Smooth Writing, Quick-Drying, No Smear,Black Gel Pens for Writing, Journaling, Note Taking, Home, School, Office Supplies
Unlock to view ASIN details and product titles
Price
$9.98
Rating
4.6
Reviews
283
Latest month sales
One Amazon dataset. Two ways to use it.
Every number in this muji pen report comes from the Amazon market data ASINSIGHT tracks. Pick how you want to work with it.
Explore the full data
Browse the complete, structured picture in a ready-made interface — and keep tracking it as the market moves.
- Organic vs. ad traffic shifts per product
- Hourly rank and search-volume tracking
- Competitor ASINs and historical trends
Starts with a free ASINSIGHT account
Analyze the data your way
Connect the same data to ChatGPT, Claude or Cursor, then combine any dimensions to answer your own questions.
- Combine product, keyword, sales & ranking data freely
- Follow up in your own words, no fixed reports
- Works in ChatGPT, Claude & Cursor
20,000 credits/mo free, no credit card