SCHEDULE 13D/A Filed 2026-05-28 Event 2026-05-11 SEC 0001931382-26-000009 →

GC Corp. → ARTIVA BIOTHERAPEUTICS, INC. ARTV

Stake: 12.30% Shares: 5,999,703 CUSIP: 04317A107 Class: Common Stock

Composite Decision Signal · WATCH (DEVELOPING SETUP) Conviction Score: 60/100

Active Schedule 13D filer baseline
1 independent officer/director Code-P buyer ($3,310,880 in ±30d)
High conviction ownership stake (12.3%)
Held by 1 tracked 13F institutional manager
Elevated short days-to-cover (6.0 DTC)
Short interest building (+19.2% vs prior settlement)

Item 4 — Purpose of Transaction

Not extracted from this filing — typically because it's an amendment (13D/A) and Item 4 is unchanged from the parent filing. Read the raw SEC filing →

Cross-References

Insider Activity (last 365d)

11 transactions

6 buys · 5 sales · 0 awards/exercises

Issuer Cluster

5 13D/G filings on this issuer

4 other filings besides this one

Filer Track Record

1 filings by this filer

0 other filings in the data moat

Short Interest · settle 2026-10-15

DTC 6.00

2,738,041 shares short · +19.2% vs prior

Institutional Consensus · 2026-06-30

Held by elite portfolio managers

1 holder · $25.26M

Viking Global

Post-Filing Returns · since 2026-05-11 on ARTV

+1 day

+0.3%

+5 days

-13.0%

+30 days

-30.0%

+60 days

-9.1%

+90 days

—

+180 days

—

Anchor price 10.60 on closest trading day on/after 2026-05-11. Source: Yahoo Finance daily adj_close (split + dividend adjusted).

Form 4 Insider Transactions · last 365d

Date	Insider	Role	Type	Shares	Price	Value
2026-09-08	RA CAPITAL MANAGEMENT, L.P.	director, 10%+ owner	Award	13,750	$10.88	$150K
2026-07-13	RA CAPITAL MANAGEMENT, L.P.	director, 10%+ owner	Buy	6,552	$8.94	$59K
2026-07-10	RA CAPITAL MANAGEMENT, L.P.	director, 10%+ owner	Buy	15,102	$8.97	$135K
2026-06-11	RA CAPITAL MANAGEMENT, L.P.	director, 10%+ owner	Buy	548,580	$7.91	$4.34M
2026-06-10	RA CAPITAL MANAGEMENT, L.P.	director, 10%+ owner	Buy	103	$7.00	$721
2026-06-09	RA CAPITAL MANAGEMENT, L.P.	director, 10%+ owner	Buy	479,039	$6.91	$3.31M
2026-05-19	Raymon Heather	officer	Sale	3,095	$9.01	$28K
2026-05-19	Horan Christopher	officer	Sale	7,002	$9.01	$63K
2026-05-19	Bush Jennifer	officer	Sale	8,790	$9.01	$79K
2026-05-19	Banerjee Subhashis	officer	Sale	7,037	$9.01	$63K
2026-05-19	Aslan Fred	director, officer	Sale	27,116	$9.01	$244K

Other 13D/G Filings on ARTIVA BIOTHERAPEUTICS, INC.

Filed	Form	Filer	Stake	Shares
2026-07-23	SCHEDULE 13D/A	RA CAPITAL MANAGEMENT, L.P.	—	18,415,956	view →
2026-06-15	SCHEDULE 13D/A	RA CAPITAL MANAGEMENT, L.P.	36.60%	17,811,623	view →
2026-05-18	SCHEDULE 13G	VIKING GLOBAL INVESTORS LP	—	—	view →
2026-05-13	SCHEDULE 13D/A	RA CAPITAL MANAGEMENT, L.P.	—	16,377,468	view →

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