Inhibrx Biosciences, Inc.
Inhibrx Biosciences, Inc. (INBX) Insider Trading
Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.
SEC EDGAR · FMP · INBX · as of Jun 8, 2026
Activity summary
Buy transactions
0
P-Purchase only
Sell transactions
3
12 Months
Buy/Sell ratio
0.00
Buy/Sell (by trades)
Overall sentiment
Inhibrx Biosciences, Inc. insiders have been primarily selling shares over the past 12 Months. Selling activity is often driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment toward the company.
▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only
As of Jun 8, 2026
INBX insider buying and selling by quarter
INBX insider selling · INBX insider buying stocks · quarterly insider activity
Mobile shows last 4Q · Desktop shows full 8Q
▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters
As of Jun 8, 2026
Active insiders
Most active in past 12 months · INBX ceo insider trading
Showing all insiders · Click a card to filter the transactions table below
▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API
Recent insider transactions
INBX executive sell shares · INBX board member insider trading · INBX insider trading SEC filing
Scroll horizontally to see all columns
| Date | Insider | Type | Shares | Value | Filing |
|---|---|---|---|---|---|
| Oct 7, 2025 | VIKING GLOBAL INVESTORS LP 10 percent owner | Sale | 308,643 | $9.95M⚡ | Form 4 |
| Oct 7, 2025 | VIKING GLOBAL INVESTORS LP 10 percent owner | Sale | 25,042 | $808K | Form 4 |
| Oct 7, 2025 | VIKING GLOBAL INVESTORS LP 10 percent owner | Sale | 16,315 | $526K | Form 4 |
| Mar 27, 2025 | Kayyem Jon Faiz Director | Gift | 90,000 | — | Form 4 |
| Dec 16, 2024 | Kayyem Jon Faiz Director | Gift | 500,000 | — | Form 4 |
| Dec 16, 2024 | Kayyem Jon Faiz Director | Gift | 250,000 | — | Form 4 |
| Dec 6, 2024 | Kayyem Jon Faiz Director | Gift | 52,000 | — | Form 4 |
| Nov 20, 2024 | Kayyem Jon Faiz Director | Purchase | 18,750 | $266K | Form 4 |
| Nov 19, 2024 | Kayyem Jon Faiz Director | Purchase | 34,843 | $496K | Form 4 |
| Oct 3, 2024 | Vuori Kristiina MD Director | Purchase | 6,667 | $100K | Form 4 |
| Sep 16, 2024 | Lappe Mark CEO · Director | Purchase | 13,037 | $223K | Form 4 |
| Sep 12, 2024 | Lappe Mark CEO · Director | Purchase | 26,963 | $406K | Form 4 |
| Sep 11, 2024 | Vuori Kristiina MD Director | Purchase | 6,457 | $97K | Form 4 |
| Sep 10, 2024 | Vuori Kristiina MD Director | Purchase | 179 | $3K | Form 4 |
| Sep 10, 2024 | Lappe Mark CEO · Director | Purchase | 8,500 | $129K | Form 4 |
| Sep 9, 2024 | Lappe Mark CEO · Director | Purchase | 9,500 | $144K | Form 4 |
| Sep 6, 2024 | Lappe Mark CEO · Director | Purchase | 26,000 | $398K | Form 4 |
| May 30, 2024 | VIKING GLOBAL INVESTORS LP 10 percent owner | Other | 511,627 | $15.35M⚡ | Form 4 |
| May 30, 2024 | Lappe Mark CEO · Director | Other | 59,462 | $1.78M⚡ | Form 4 |
| May 30, 2024 | Kayyem Jon Faiz Director | Other | 25,000 | $750K | Form 4 |
| May 30, 2024 | FORSYTH DOUGLAS Director | Other | 598,257 | $17.95M⚡ | Form 4 |
| May 28, 2024 | Eckelman Brendan P. Chief Scientific Officer | Sale | 300,000 | $10.29M⚡ | Form 4 |
| May 30, 2024 | Eckelman Brendan P. Chief Scientific Officer | Other | 160,000 | $4.80M⚡ | Form 4 |
| Aug 28, 2023 | VIKING GLOBAL INVESTORS LP 10 percent owner | Purchase | 511,627 | $9.90M⚡ | Form 4 |
| Mar 1, 2023 | Eckelman Brendan P. Chief Scientific Officer | Sale | 39,600 | $958K | Form 4 |
VIKING GLOBAL INVESTORS LP
10 percent owner
Date
Oct 7
Shares
308,643
Price
$32.25
Value
$9.95M ⚡
VIKING GLOBAL INVESTORS LP
10 percent owner
Date
Oct 7
Shares
25,042
Price
$32.25
Value
$808K
VIKING GLOBAL INVESTORS LP
10 percent owner
Date
Oct 7
Shares
16,315
Price
$32.25
Value
$526K
VIKING GLOBAL INVESTORS LP
10 percent owner
Date
May 30
Shares
511,627
Price
$30.00
Value
$15.35M ⚡
Eckelman Brendan P.
Chief Scientific Officer
Date
May 28
Shares
300,000
Price
$34.30
Value
$10.29M ⚡
Eckelman Brendan P.
Chief Scientific Officer
Date
May 30
Shares
160,000
Price
$30.00
Value
$4.80M ⚡
VIKING GLOBAL INVESTORS LP
10 percent owner
Date
Aug 28
Shares
511,627
Price
$19.35
Value
$9.90M ⚡
Eckelman Brendan P.
Chief Scientific Officer
Date
Mar 1
Shares
39,600
Price
$24.20
Value
$958K
⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar
▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —
About INBX insider trading
INBX insider trades
Inhibrx Biosciences, Inc. (INBX) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including VIKING GLOBAL INVESTORS LP (10 percent owner). Over the past 12 months, 1 insiders have filed transactions with the SEC. INBX insiders have been primarily selling, which may reflect pre-scheduled Rule 10b5-1 plan executions.
For Inhibrx Biosciences, Inc.'s institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →
Frequently asked questions
INBX insider trading · 5 questionsThe insiders of Inhibrx Biosciences, Inc. (INBX) include executives and directors such as VIKING GLOBAL INVESTORS LP (10 percent owner), among others. Over the past 12 months, 1 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.
▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 8, 2026