Pharmaceutical · Fiscal year end Mar 31

Kidswell Bio Corporation

4584

キッズウェル・バイオ株式会社

FIGI BBG003LHRRJ34584.T4584 JPCorp. no. 5430001027036

Latest half-year results

First half · fiscal year to 2026-03 · filed 2025-11-14

For the first half of the fiscal year to 2026-03: Revenue ¥3.3 billion (+87.2% YoY), Ordinary income ¥0.1 billion, Net income ¥0.1 billion.

	This period	Year on year
Revenue	¥3.3bn	+87.2%
Ordinary profit	¥77m	—
Net profit to owners	¥61m	—

From the securities report on EDINET, which states no forecast. History via /v1/companies/4584/earnings-releases.

Financials

Japan GAAP · consolidated · fiscal year to 2026-03-31

Revenue: ¥6.6bn
Net income: −¥414m
ROE: —
Equity ratio: 26.4%
Dividend / share: —
Employees: 32

Revenue · ¥bn

Net income · ¥m

Fiscal year	Revenue	Net income	Total assets	Net assets	ROE	EPS	Operating CF
2026-03-31	¥6,590m	−¥414m	¥6,088m	¥1,654m	—	¥-8.48	−¥1,096m
2025-03-31	¥5,082m	−¥21m	¥7,008m	¥1,411m	—	¥-0.52	¥937m
2022-03-31	¥1,569m	−¥535m	¥3,503m	¥1,719m	—	¥-17.35	−¥1,170m

Indicators

Computed by us from filings · fiscal year to 2026-03-31

Metric	Value	Percentile among listed companies
ROE, %	—	—
Ordinary margin	-0.0569	5.5
Equity ratio, %	26.4	11.3
Revenue growth	0.2967	93.6
Net income growth	-18.5834	0.5
Operating cash flow / assets	-0.18	2.9

Policy-uncertainty measure0.00 Share of the report's text discussing policy-related uncertainty, by policy area. Proprietary text method.

Ownership activity 0 filer(s) stated they may make proposals in 365 days; 0 new 5% holder(s) in 180 days; net stake change 0.00pt in 90 days; 21.1% held by other listed companies.

Results wording balance: +0.75. Proprietary text method; it describes the wording only and does not interpret context.

Interest example: if all ¥2.6bn of reported debt repriced by 50 basis points, a year's interest would rise by ¥13m. Our arithmetic only, not a forecast: fixed-rate debt and hedges are ignored.

Via /v1/companies/4584/indicators. Descriptive figures, not a rating and not investment advice.

From other filings

As the company states them

Internal control, 2026-06-29: see filing 上記の評価の結果、当事業年度末日時点において、当社の財務報告に係る内部統制は有効であると判断いたしました。 Filing

Ownership changes

All companies →

2026-07-29

Below 5%−0.59pt

Heights Capital Management, Inc. cut holdings in Kidswell Bio Corporation (4584) to 4.55% from 5.14%, below the 5% threshold.

S100YSSGFiler profile Original filing (PDF, Japanese)
2026-05-21

Decrease−13.52pt

Noritsu Koki Co.,Ltd. reduced holdings in Kidswell Bio Corporation (4584) to 19.08% from 32.60%.

S100Y0ZOFiler profile Original filing (PDF, Japanese)
2026-05-21

Threshold

Holdings of Noritsu Koki Co.,Ltd. in Kidswell Bio Corporation (4584) moved below 20% (32.60% -> 19.08%).

S100Y0ZOFiler profile Original filing (PDF, Japanese)
2025-09-26

Decrease−1.00pt

Heights Capital Management, Inc. reduced holdings in Kidswell Bio Corporation (4584) to 5.14% from 6.14%.

S100WREVFiler profile Original filing (PDF, Japanese)
2025-08-27

Decrease−1.28pt

Heights Capital Management, Inc. reduced holdings in Kidswell Bio Corporation (4584) to 6.14% from 7.42%.

S100WKYNFiler profile Original filing (PDF, Japanese)
2025-08-21

Decrease−1.51pt

Heights Capital Management, Inc. reduced holdings in Kidswell Bio Corporation (4584) to 7.42% from 8.93%.

S100WJV5Filer profile Original filing (PDF, Japanese)
2025-04-23

Decrease−2.01pt

Heights Capital Management, Inc. reduced holdings in Kidswell Bio Corporation (4584) to 8.93% from 10.94%.

S100VNJVFiler profile Original filing (PDF, Japanese)
2025-04-23

Threshold

Holdings of Heights Capital Management, Inc. in Kidswell Bio Corporation (4584) moved below 10% (10.94% -> 8.93%).

S100VNJVFiler profile Original filing (PDF, Japanese)
2025-04-22

Decrease−2.32pt

Heights Capital Management, Inc. reduced holdings in Kidswell Bio Corporation (4584) to 10.94% from 13.26%.

S100VN68Filer profile Original filing (PDF, Japanese)
2025-04-15

Decrease−1.11pt

Heights Capital Management, Inc. reduced holdings in Kidswell Bio Corporation (4584) to 13.26% from 14.37%.

S100VLXOFiler profile Original filing (PDF, Japanese)

Trades by 5% holders

From the 60-day trade tables in 5% reports

Holder	Period	Net shares	Net % of shares	Avg. filed price	Range
Heights Capital Management, Inc.	2022-07-09 – 2026-07-22	+601,913	+2.28pt	—	—
ノーリツ鋼機株式会社	2026-05-18 – 2026-05-18	-4,000	−0.01pt	—	—
individual filer	2022-05-30 – 2022-06-01	-22,700	0.00pt	—	—

Net shares and the average are our calculations. Prices are filed prices as stated by the filer, mostly for off-market trades; they are not market prices. Stock lending, custody transfers and option exercises are excluded from net shares. Every row via /v1/companies/4584/trades.

5% filings

Large shareholding reports on 4584

Filed	Filer	Stake	Change	Stated purpose
2026-07-29	Heights Capital Management, Inc.	4.55%	−0.59pt	pure investment
2026-05-21	Noritsu Koki Co.,Ltd.	19.08%	−13.52pt	—
2025-09-26	Heights Capital Management, Inc.	5.14%	−1.00pt	pure investment
2025-08-27	Heights Capital Management, Inc.	6.14%	−1.28pt	pure investment
2025-08-21	Heights Capital Management, Inc.	7.42%	−1.51pt	pure investment
2025-04-23	Heights Capital Management, Inc.	8.93%	−2.01pt	pure investment
2025-04-22	Heights Capital Management, Inc.	10.94%	−2.32pt	pure investment
2025-04-15	Heights Capital Management, Inc.	13.26%	−1.11pt	pure investment
2025-04-10	Heights Capital Management, Inc.	14.37%	−1.33pt	pure investment
2025-04-09	Heights Capital Management, Inc.	15.70%	−0.47pt	pure investment

Cross-shareholdings

From the annual report's status of shareholdings

Listed strategic holdings: 1 issues
Book value: ¥207m
Sold in the year: — — issues
Bought in the year: — — issues
Mutual, both reports: 0
Held by listed cos.: 2

Holds	Book value	Shares vs. prior year	Mutual
Heartseed Inc. 219A	¥207m	0.0%	no

Held by: Noritsu Koki Co.,Ltd. 7744, Nano Holdings, Inc. 4571

Purposes, all holdings and mutual flags via /v1/companies/4584/cross-holdings. Share changes include stock splits.

Major shareholders

As of fiscal year end 2026-03-31

Shareholder	Shares	Ratio
ノーリツ鋼機株式会社	9,471,832	19.08%
individual holder	2,000,000	4.03%
NANO ホールディングス株式会社	1,000,000	2.01%
楽天証券株式会社共有口	792,600	1.59%
千寿製薬株式会社	555,200	1.11%
野村信託銀行株式会社	471,000	0.94%
individual holder	445,000	0.89%
BNY GCM CLIENT ACCOUNT JPRD AC ISG (FE-AC)	440,600	0.88%
individual holder	436,800	0.88%
individual holder	400,050	0.80%

U.S. funds holding 4584

SEC Form N-PORT, reports to 2026-05-31

1 U.S. funds held 200 shares worth $0.0m.

Fund	Shares	Value	% of fund	As of
Avantis International Small Cap Equity ETF American Century ETF Trust	200	$0.0m	0.000%	2026-05-31

Up to 25 funds per stock via the API.

Get this as JSON

GET /v1/companies/4584
GET /v1/companies/4584/financials
GET /v1/companies/4584/details
GET /v1/companies/4584/segments
GET /v1/companies/4584/voting
GET /v1/companies/4584/tender-offers
GET /v1/companies/4584/indicators
GET /v1/companies/4584/earnings-releases
GET /v1/events?ticker=4584
GET /v1/companies/4584/trades         
GET /v1/companies/4584/cross-holdings 
GET /v1/companies/4584/brief

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