Personalis, Inc.
Personalis, Inc. (PSNL) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · PSNL · as of Sep 30, 2025
Ownership Breakdown
113
Institutional Holders
▲ 5 vs Q2
$422.59M
Total Inst. Value
▲ $25.97M vs Q2
88.80M
Shares Outstanding
freeFloat 59.41%
64.81M
13F Shares Held
▲ 4.36M 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
PSNL largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
MERCK & CO., INC. services-medical laboratories | 14.04M | 15.87% | 15.87% | $91.57B | Nov 12, 2025 | — held |
LIGHTSPEED MANAGEMENT COMPANY, L.L.C. services-medical laboratories | 8.16M | 9.22% | 9.22% | $53.21B | Nov 14, 2025 | — held |
ARK INVESTMENT MANAGEMENT LLC services-medical laboratories | 7.91M | 8.94% | 8.94% | $51.57B | Nov 12, 2025 | ▲ 802.3K |
BLACKROCK, INC. services-medical laboratories | 5.64M | 6.38% | 6.38% | $36.80B | Nov 12, 2025 | ▲ 440.8K |
AIGH CAPITAL MANAGEMENT LLC services-medical laboratories | 3.89M | 4.40% | 4.40% | $25.38B | Oct 31, 2025 | ▲ 168.1K |
VANGUARD GROUP INC services-medical laboratories | 3.01M | 3.40% | 3.40% | $19.60B | Nov 7, 2025 | ▼ 130.7K |
T. ROWE PRICE INVESTMENT MANAGEMENT, INC. services-medical laboratories | 2.88M | 3.26% | 3.26% | $18.80B | Nov 14, 2025 | ▲ 1.62M |
ABRDN PLC services-medical laboratories | 2.39M | 2.70% | 2.70% | $15.57B | Nov 7, 2025 | ▲ 628.5K |
KENNEDY CAPITAL MANAGEMENT LLC services-medical laboratories | 1.94M | 2.19% | 2.19% | $12.62B | Nov 13, 2025 | ▲ 1.28M |
BLUE WATER LIFE SCIENCE ADVISORS, LP services-medical laboratories | 1.68M | 1.89% | 1.89% | $10.93B | Nov 14, 2025 | — held |
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
18
Increased
+6.30M shares4
New Positions
first time holders19
Decreased
−1.25M shares0
Sold Out
fully exitedNet shares change (top 50)
+5.04M
+6.30M / −1.25M
Net new holders
+3
4 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
PSNL insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
16
Buy transactions
7
Sell transactions
2.29
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Tachibana Aaron CFO AND COO | Jun 4, 2026 | Sale | 40,000 | $12.01 | $480.4K | 198.8K | Form 4 ↗ |
Hall Christopher M Chief Executive Officer | May 29, 2026 | Sale | 80,091 | $11.02 | $882.6K | 236.0K | Form 4 ↗ |
Tachibana Aaron CFO AND COO | May 29, 2026 | Sale | 38,799 | $11.58 | $449.3K | 198.8K | Form 4 ↗ |
EASTHAM KARIN director | May 12, 2026 | Award | 37,500 | $6.04 | $226.5K | 37.5K | Form 4 ↗ |
EASTHAM KARIN director | May 12, 2026 | Award | 6,250 | — | — | 22.4K | Form 4 ↗ |
BOWMAN A BLAINE director | May 12, 2026 | Award | 37,500 | $6.04 | $226.5K | 37.5K | Form 4 ↗ |
BOWMAN A BLAINE director | May 12, 2026 | Award | 6,250 | — | — | 19.8K | Form 4 ↗ |
WIDDER KENNETH J director | May 12, 2026 | Award | 37,500 | $6.04 | $226.5K | 37.5K | Form 4 ↗ |
WIDDER KENNETH J director | May 12, 2026 | Award | 6,250 | — | — | 6.3K | Form 4 ↗ |
Shoff Lonnie director | May 12, 2026 | Award | 37,500 | $6.04 | $226.5K | 37.5K | 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
Personalis, Inc. (PSNL) is primarily owned by institutional investors, who hold approximately 73.0% of total shares outstanding. Company insiders own approximately 40.59%, while retail and public investors account for the remaining 0.00%.
The largest institutional shareholder of Personalis, Inc. is MERCK & CO., INC., holding approximately 14.04 million shares — equal to 15.87% of outstanding shares — as of September 30, 2025.
A total of 113 institutional investors currently hold PSNL stock, with a combined institutional value of approximately $422,586,939 as of the most recent 13F filing period.
Frequently asked questions
PSNL ownershipPersonalis, Inc. (PSNL) is primarily owned by institutional investors, who hold approximately 73.0% of shares. The largest shareholder is MERCK & CO., INC. with a 15.87% stake. Company insiders hold 40.59%. Data sourced from SEC Form 13F as of September 30, 2025.