Nautilus Biotechnology, Inc.
Nautilus Biotechnology, Inc. (NAUT) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · NAUT · as of Sep 30, 2025
Ownership Breakdown
65
Institutional Holders
▼ 4 vs Q2
$48.91M
Total Inst. Value
▲ $5.60M vs Q2
127.08M
Shares Outstanding
freeFloat 41.09%
57.90M
13F Shares Held
▼ 1.86M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
NAUT largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
AH CAPITAL MANAGEMENT, L.L.C. laboratory analytical instruments | 17.65M | 13.99% | 13.99% | $14.92B | Nov 14, 2025 | — held |
PERCEPTIVE ADVISORS LLC laboratory analytical instruments | 12.59M | 9.98% | 9.98% | $10.64B | Nov 14, 2025 | — held |
CERCANO MANAGEMENT LLC laboratory analytical instruments | 7.17M | 5.68% | 5.68% | $6.06B | Nov 7, 2025 | — held |
MADRONA VENTURE GROUP, LLC laboratory analytical instruments | 6.02M | 4.77% | 4.77% | $5.09B | Oct 31, 2025 | — held |
VANGUARD GROUP INC laboratory analytical instruments | 2.43M | 1.93% | 1.93% | $2.05B | Nov 7, 2025 | ▼ 53.3K |
COMPREHENSIVE FINANCIAL MANAGEMENT LLC laboratory analytical instruments | 2.21M | 1.75% | 1.75% | $1.87B | Nov 14, 2025 | — held |
AMAZON COM INC laboratory analytical instruments | 1.46M | 1.15% | 1.15% | $1.23B | Nov 4, 2025 | — held |
CLARIUS GROUP, LLC laboratory analytical instruments | 1.21M | 95.87% | 95.87% | $1.02B | Oct 14, 2025 | ▲ 149.2K |
RENAISSANCE TECHNOLOGIES LLC laboratory analytical instruments | 1.01M | 79.86% | 79.86% | $851.37M | Nov 13, 2025 | ▲ 387.8K |
MILLENNIUM MANAGEMENT LLC laboratory analytical instruments | 967.5K | 76.68% | 76.68% | $817.48M | Nov 14, 2025 | ▼ 89.3K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
8
Increased
+945.9K shares5
New Positions
first time holders21
Decreased
−1.40M shares0
Sold Out
fully exitedNet shares change (top 50)
456.2K
+945.9K / −1.40M
Net new holders
-8
5 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
NAUT insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
0
Buy transactions
2
Sell transactions
0.00
Buy/Sell ratio
$5M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
AH Equity Partners Bio II, L.L.C. 10 percent owner | Jun 2, 2026 | Sale | 4,615,974 | $2.35 | $10.85M | 11.68M | Form 4 ↗ |
AH Equity Partners Bio II, L.L.C. 10 percent owner | Jun 2, 2026 | Sale | 384,026 | $2.35 | $902.5K | 971.9K | Form 4 ↗ |
Patel Sujal M CEO, President, and Secretary | Mar 4, 2026 | Purchase | 25,000 | $2.61 | $65.2K | 10.37M | Form 4 ↗ |
Mowry Anna CFO and Treasurer | Mar 2, 2026 | Award | 160,000 | $2.32 | $371.2K | 160.0K | Form 4 ↗ |
Mallick Parag Chief Scientist | Mar 2, 2026 | Award | 280,000 | $2.32 | $649.6K | 280.0K | Form 4 ↗ |
Patel Sujal M CEO, President, and Secretary | Mar 2, 2026 | Award | 650,000 | $2.32 | $1.51M | 650.0K | Form 4 ↗ |
Sankar Subramanian Senior VP, Product Development | Mar 2, 2026 | Award | 160,000 | $2.32 | $371.2K | 160.0K | Form 4 ↗ |
Weld Gwen E Chief People Officer | Mar 2, 2026 | Award | 160,000 | $2.32 | $371.2K | 160.0K | Form 4 ↗ |
Murphy Matthew B. General Counsel | Mar 2, 2026 | Award | 160,000 | $2.32 | $371.2K | 160.0K | Form 4 ↗ |
Suzuki Kentaro Chief Marketing Officer | Mar 2, 2026 | Award | 160,000 | $2.32 | $371.2K | 160.0K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Nautilus Biotechnology, Inc. (NAUT) is primarily owned by institutional investors, who hold approximately 45.6% of total shares outstanding. Company insiders own approximately 58.91%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Nautilus Biotechnology, Inc. is AH CAPITAL MANAGEMENT, L.L.C., holding approximately 17.65 million shares — equal to 13.99% of outstanding shares — as of September 30, 2025.
A total of 65 institutional investors currently hold NAUT stock, with a combined institutional value of approximately $48,912,774 as of the most recent 13F filing period.
Frequently asked questions
NAUT ownershipNautilus Biotechnology, Inc. (NAUT) is primarily owned by institutional investors, who hold approximately 45.6% of shares. The largest shareholder is AH CAPITAL MANAGEMENT, L.L.C. with a 13.99% stake. Company insiders hold 58.91%. Data sourced from SEC Form 13F as of September 30, 2025.