SCHEDULE 13D Filed 2026-06-29 Event 2026-06-22 SEC 0001193125-26-288406 →

ARCH Venture Fund XIII, L.P. → Kardigan, Inc. KARD

Stake: 16.20% Shares: 15,042,035 CUSIP: 48563V117 Class: Common Stock, $0.00001 par value per share

Item 4 — Purpose of Transaction

AVF XIII and the other Reporting Persons acquired the Common Stock for investment purposes. Depending on market conditions, the continuing evaluation of the business and prospects of the Issuer and other factors, AVF XIII and other Reporting Persons may dispose of or acquire additional shares of Common Stock of the Issuer. Except as set forth above, none of the Reporting Persons has any present plans which relate to or would result in the matters set forth in subparagraphs (a) - (j) of Item 4 of Schedule 13D.

Cross-References

Insider Activity (last 365d)

37 transactions

13 buys · 0 sales · 0 awards/exercises

Issuer Cluster

4 13D/G filings on this issuer

3 other filings besides this one

Filer Track Record

1 filings by this filer

0 other filings in the data moat

Short Interest · settle 2026-09-30

DTC 3.77

4,445,126 shares short · +73.0% vs prior

Post-Filing Returns · since 2026-06-22 on KARD

+1 day

0.0%

+5 days

0.0%

+30 days

-4.1%

+60 days

—

+90 days

—

+180 days

—

Anchor price 23.83 on closest trading day on/after 2026-06-22. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Form 4 Insider Transactions · last 365d

Date	Insider	Role	Type	Shares	Price	Value
2026-06-22	HRTG GPE, LLC	10%+ owner	Buy	3,125,000	$16.00	$50.00M
2026-06-22	BERNS PAUL L	director, 10%+ owner	Buy	1,250,000	$16.00	$20.00M
2026-06-22	ARCH Venture Partners XIII, LLC	director, 10%+ owner	Buy	1,250,000	$16.00	$20.00M
2026-06-17	HRTG GPE, LLC	10%+ owner	C	2,050,166	—	—
2026-06-17	HRTG GPE, LLC	10%+ owner	C	6,150,502	—	—
2026-06-17	HRTG GPE, LLC	10%+ owner	C	3,242,993	—	—
2026-06-17	HRTG GPE, LLC	10%+ owner	C	2,348,373	—	—
2026-06-17	HRTG GPE, LLC	10%+ owner	C	1,287,146	—	—
2026-06-17	HRTG GPE, LLC	10%+ owner	C	3,861,440	—	—
2026-06-17	HRTG GPE, LLC	10%+ owner	C	2,036,033	—	—
2026-06-17	HRTG GPE, LLC	10%+ owner	C	1,474,368	—	—
2026-06-17	ARCH Venture Partners XIII, LLC	director, 10%+ owner	C	13,792,035	—	—
2026-06-17	ARCH Venture Partners XIII, LLC	director, 10%+ owner	C	5,148,587	—	—
2026-06-17	ARCH Venture Partners XIII, LLC	director, 10%+ owner	C	1,204,000	—	—
2026-06-17	ARCH Venture Partners XIII, LLC	director, 10%+ owner	C	2,306,401	—	—
2026-06-17	Pasternak Andy	officer	Award	79,640	—	—
2026-06-17	Meeker David P	director	Award	20,706	—	—
2026-06-17	BERNS PAUL L	director, 10%+ owner	C	13,792,035	—	—
2026-06-17	BERNS PAUL L	director, 10%+ owner	Award	20,706	—	—
2026-06-17	BERNS PAUL L	director, 10%+ owner	C	5,148,587	—	—
2026-06-17	BERNS PAUL L	director, 10%+ owner	C	1,204,000	—	—
2026-06-17	BERNS PAUL L	director, 10%+ owner	C	2,306,401	—	—
2026-06-17	Moriarty John B	officer	Award	47,784	—	—
2026-06-17	Jahn Brianne	officer	Award	79,640	—	—
2026-06-17	Popovits Kimberly J	director	Award	20,706	—	—

Showing 25 of 37

Other 13D/G Filings on Kardigan, Inc.

Filed	Form	Filer	Stake	Shares
2026-10-01	SCHEDULE 13D/A	PERCEPTIVE ADVISORS LLC	—	8,254,144	view →
2026-06-29	SCHEDULE 13G	HRTG GPE, LLC	—	—	view →
2026-06-25	SCHEDULE 13D	PERCEPTIVE ADVISORS LLC	8.90%	8,254,144	view →

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