PERSONALIS INC (PSNL) Institutional Shareholders
PERSONALIS INC (PSNL) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $540.95M in PSNL holdings during the latest filing period.
Merck & Co., Inc. is currently the largest disclosed institutional shareholder of PSNL tracked by InsiderSet, reporting ownership valued at approximately $89.47M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $189.89M, representing an estimated gain of +112.24% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 73% of the total disclosed PSNL value among the investors covered in this analysis. Major shareholders include Merck & Co., Inc., Lightspeed Management Company, L.L.C., ARK Invest, and several other long-term asset managers with concentrated positions in PERSONALIS INC (PSNL).
This page ranks the largest institutional PSNL shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
137
Total Reported Value
$540.95M
Largest Holder
Merck & Co., Inc.
Largest Position
$89.47M
Insider Transactions (90d)
11
Latest Filing Quarter
Q2 2026
New Institutional Positions
163
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Merck & Co., Inc. | 25.60% | 14,044,943 | $89,466,287 | $189,887,629 | +$100,421,342 | +112.24% | |
| Lightspeed Management Company, L.L.C. | 5.26% | 8,160,734 | $51,983,876 | $110,333,124 | +$58,349,248 | +112.24% | |
| ARK Invest | Cathie Wood | 0.39% | 7,944,112 | $50,603,993 | $107,404,394 | +$56,800,401 | +112.24% |
| Aberdeen Group Plc | 0.07% | 3,747,290 | $50,213,686 | $50,663,361 | +$449,675 | +0.90% | |
| Ameriprise Financial Inc | 0.01% | 7,592,807 | $48,366,193 | $102,654,751 | +$54,288,558 | +112.24% | |
| Blackrock, Inc. | 0.00% | 5,389,885 | $34,333,567 | $72,871,245 | +$38,537,678 | +112.24% | |
| Deep Track Capital, Lp | 0.39% | 3,000,000 | $19,110,000 | $40,560,000 | +$21,450,000 | +112.24% | |
| Aigh Capital Management Llc | 3.78% | 2,900,000 | $18,473,000 | $39,208,000 | +$20,735,000 | +112.24% | |
| Vanguard Capital Management Llc | 0.00% | 2,868,463 | $18,272,109 | $38,781,620 | +$20,509,511 | +112.24% | |
| Kennedy Capital Management Llc | 0.29% | 2,183,572 | $13,909,354 | $29,521,893 | +$15,612,539 | +112.24% | |
| Blue Water Life Science Advisors, Lp | 8.56% | 1,676,300 | $10,678,031 | $22,663,576 | +$11,985,545 | +112.24% | |
| Casdin Capital, Llc | 0.77% | 1,600,000 | $10,192,000 | $21,632,000 | +$11,440,000 | +112.24% | |
| Geode Capital Management, Llc | 0.00% | 1,297,655 | $8,268,159 | $17,544,296 | +$9,276,137 | +112.19% | |
| Howland Capital Management Llc | 0.27% | 555,641 | $7,445,590 | $7,512,266 | +$66,676 | +0.90% | |
| State Street Corp | 0.00% | 1,134,170 | $7,224,663 | $15,333,978 | +$8,109,315 | +112.24% | |
| Dimensional Fund Advisors Lp | 0.00% | 1,066,248 | $6,790,741 | $14,415,673 | +$7,624,932 | +112.28% | |
| State Of Michigan Retirement System | 0.03% | 493,798 | $6,616,893 | $6,676,149 | +$59,256 | +0.90% | |
| Sumitomo Mitsui Trust Group, Inc. | 0.00% | 417,488 | $5,594,339 | $5,644,438 | +$50,099 | +0.90% | |
| Pfm Health Sciences, Lp | 0.58% | 870,097 | $5,542,518 | $11,763,711 | +$6,221,193 | +112.24% | |
| Iq Eq Fund Management (Ireland) Ltd | 0.30% | 351,741 | $4,713,329 | $4,755,538 | +$42,209 | +0.90% | |
| Goldman Sachs Group Inc | 0.00% | 737,132 | $4,695,531 | $9,966,025 | +$5,270,494 | +112.24% | |
| Portolan Capital Management, Llc | 0.25% | 736,713 | $4,692,862 | $9,960,360 | +$5,267,498 | +112.24% | |
| Vanguard Portfolio Management Llc | 0.00% | 560,539 | $3,570,633 | $7,578,487 | +$4,007,854 | +112.24% | |
| Perkins Capital Management Inc | 2.41% | 239,000 | $3,202,600 | $3,231,280 | +$28,680 | +0.90% | |
| Amova Asset Management Americas, Inc. | 0.04% | 484,270 | $3,075,115 | $6,547,330 | +$3,472,215 | +112.91% | |
| Udine Wealth Management, Inc. | 1.19% | 50,030 | $2,898,238 | $676,406 | -$2,221,832 | -76.66% | |
| Millennium Management Llc | 0.00% | 419,128 | $2,669,845 | $5,666,611 | +$2,996,766 | +112.24% | |
| Northern Trust Corp | 0.00% | 405,800 | $2,584,946 | $5,486,416 | +$2,901,470 | +112.24% | |
| Ubs Group Ag | 0.00% | 383,503 | $2,442,914 | $5,184,961 | +$2,742,047 | +112.24% | |
| Nuveen, Llc | 0.00% | 343,520 | $2,188,223 | $4,644,390 | +$2,456,167 | +112.24% | |
| Wellington Shields Capital Management, Llc | 0.32% | 339,733 | $2,164,101 | $4,593,190 | +$2,429,089 | +112.24% | |
| Vanguard Fiduciary Trust Co | 0.00% | 339,508 | $2,162,666 | $4,590,148 | +$2,427,482 | +112.24% | |
| Balyasny Asset Management L.P. | 0.00% | 308,696 | $1,966,394 | $4,173,570 | +$2,207,176 | +112.24% | |
| Adage Capital Partners Gp, L.L.C. | 0.00% | 300,000 | $1,911,000 | $4,056,000 | +$2,145,000 | +112.24% | |
| Wellington Shields & Co., Llc | 0.47% | 292,489 | $1,863,155 | $3,954,451 | +$2,091,296 | +112.24% | |
| Morgan Stanley | 0.00% | 237,315 | $1,511,698 | $3,208,499 | +$1,696,801 | +112.24% | |
| Nano Cap New Millennium Growth Fund L P | 1.40% | 235,000 | $1,496,950 | $3,177,200 | +$1,680,250 | +112.24% | |
| Bruce & Co., Inc. | 0.42% | 233,000 | $1,484,210 | $3,150,160 | +$1,665,950 | +112.24% | |
| First Manhattan Co. Llc. | 0.00% | 230,600 | $1,468,922 | $3,117,712 | +$1,648,790 | +112.24% | |
| Tudor Investment Corp Et Al | 0.01% | 209,826 | $1,336,592 | $2,836,848 | +$1,500,256 | +112.24% | |
| Kercheville Advisors, Llc | 0.38% | 93,800 | $1,256,920 | $1,268,176 | +$11,256 | +0.90% | |
| Citigroup Inc | 0.00% | 92,708 | $1,242,287 | $1,253,412 | +$11,125 | +0.90% | |
| Alphacentric Advisors Llc | 0.90% | 78,924 | $1,057,582 | $1,067,052 | +$9,470 | +0.90% | |
| Royce & Associates Lp | 0.01% | 156,036 | $993,949 | $2,109,607 | +$1,115,658 | +112.24% | |
| Susquehanna International Group, Llp | 0.00% | 149,336 | $951,270 | $2,019,023 | +$1,067,753 | +112.24% | |
| Charles Schwab Investment Management Inc | 0.00% | 144,626 | $921,268 | $1,955,344 | +$1,034,076 | +112.24% | |
| Sei Investments Co | 0.00% | 139,046 | $885,723 | $1,879,902 | +$994,179 | +112.24% | |
| Williams Jones Wealth Management, Llc. | 0.01% | 134,072 | $854,039 | $1,812,653 | +$958,614 | +112.24% | |
| Lpl Financial Llc | 0.00% | 132,012 | $840,916 | $1,784,802 | +$943,886 | +112.25% | |
| Bank Of New York Mellon Corp | 0.00% | 124,641 | $793,965 | $1,685,146 | +$891,181 | +112.24% |
Frequently asked questions about PSNL
Who owns the most PSNL stock?
The largest holders of PSNL are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for PERSONALIS INC (PSNL).
Is PSNL widely held by superinvestors?
Many widely followed stocks like PSNL appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly PSNL is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.