Who owns Proto Labs (PRLB)
Which tracked institutional funds hold PRLB, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See PRLB company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on PRLB is one-sided between 2026-Q1 and 2026-Q2: 110 added or opened and 33 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
PRLB’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes PRLB more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in PRLB divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 254 tracked filers holding PRLB, 135 increased or opened the position and 131 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in PRLB between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 10
- Roubaix Capital, LLC$5M
- ExodusPoint Capital Management, LP$3M
- AEGON ASSET MANAGEMENT UK Plc$3M
- SG Capital Management LLC$2M
- Jump Financial, LLC$1M
- Jupiter Topco LLC$996K
Full exits 19
- Qube Research & Technologies Ltd$8M
- Polar Asset Management Partners Inc.$3M
- Archon Capital Management LLC$3M
- GSA CAPITAL PARTNERS LLP$3M
- Integrated Quantitative Investments LLC$2M
- Bastion Asset Management Inc.$2M
Largest adds
- BlackRock, Inc.$176M
- DISCIPLINED GROWTH INVESTORS INC /MN$52M
- VANGUARD PORTFOLIO MANAGEMENT LLC$43M
- STATE STREET CORP$31M
- VANGUARD CAPITAL MANAGEMENT LLC$27M
- GOLDMAN SACHS GROUP INC$25M
Largest trims
- Rubric Capital Management LP$19M
- LAZARD ASSET MANAGEMENT LLC$5M
- Trexquant Investment LP$3M
- MARSHALL WACE, LLP$2M
- UBS Group AG$2M
- Assenagon Asset Management S.A.$2M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 3,896,222 | $318M | 18.0% | 2026-Q2 |
| DISCIPLINED GROWTH INVESTORS INC /MN trimmed | 2,380,514 | $194M | 11.0% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 1,599,765 | $130M | 7.4% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 1,152,305 | $94M | 5.3% | 2026-Q2 |
| STATE STREET CORP added | 1,138,462 | $93M | 5.3% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 1,054,623 | $86M | 4.9% | 2026-Q2 |
| AMERICAN CAPITAL MANAGEMENT INC trimmed | 619,845 | $51M | 2.9% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 614,028 | $50M | 2.8% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 469,251 | $38M | 2.2% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC added | 457,810 | $37M | 2.1% | 2026-Q2 |
| FMR LLC added | 442,659 | $36M | 2.0% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 440,816 | $36M | 2.0% | 2026-Q2 |
| Nuveen, LLC added | 420,059 | $34M | 1.9% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 403,179 | $33M | 1.9% | 2026-Q2 |
| Driehaus Capital Management LLC added | 370,151 | $30M | 1.7% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 354,188 | $29M | 1.6% | 2026-Q2 |
| MORGAN STANLEY added | 314,778 | $26M | 1.5% | 2026-Q2 |
| S SQUARED TECHNOLOGY, LLC trimmed | 288,120 | $23M | 1.3% | 2026-Q2 |
| NORTHERN TRUST CORP added | 284,562 | $23M | 1.3% | 2026-Q2 |
| FIRST TRUST ADVISORS LP added | 224,792 | $18M | 1.0% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 224,717 | $18M | 1.0% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 211,366 | $17M | 1.0% | 2026-Q2 |
| NORDEA INVESTMENT MANAGEMENT AB trimmed | 203,883 | $17M | 0.9% | 2026-Q2 |
| Hillsdale Investment Management Inc. added | 191,594 | $16M | 0.9% | 2026-Q2 |
| JUPITER ASSET MANAGEMENT LTD trimmed | 188,539 | $15M | 0.9% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC added | 180,713 | $15M | 0.8% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 157,987 | $13M | 0.7% | 2026-Q2 |
| Bank of New York Mellon Corp added | 143,782 | $12M | 0.7% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 143,527 | $12M | 0.7% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 135,136 | $11M | 0.6% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 125,997 | $10M | 0.6% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 120,473 | $10M | 0.6% | 2026-Q2 |
| GAGNON SECURITIES LLC added | 116,283 | $9M | 0.5% | 2026-Q2 |
| RICE HALL JAMES & ASSOCIATES, LLC trimmed | 108,964 | $9M | 0.5% | 2026-Q2 |
| Rubric Capital Management LP trimmed | 108,692 | $9M | 0.5% | 2026-Q2 |
| Invesco Ltd. added | 108,421 | $9M | 0.5% | 2026-Q2 |
| UBS Group AG trimmed | 97,304 | $8M | 0.4% | 2026-Q2 |
| Public Sector Pension Investment Board trimmed | 95,645 | $8M | 0.4% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 92,960 | $8M | 0.4% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 88,625 | $7M | 0.4% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 79,056 | $6M | 0.4% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 69,786 | $6M | 0.3% | 2026-Q2 |
| Edgestream Partners, L.P. added | 65,799 | $5M | 0.3% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 65,044 | $5M | 0.3% | 2026-Q2 |
| Informed Momentum Co LLC trimmed | 64,803 | $5M | 0.3% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 57,970 | $5M | 0.3% | 2026-Q2 |
| Legal & General Group Plc trimmed | 56,739 | $5M | 0.3% | 2026-Q2 |
| Roubaix Capital, LLC new | 55,415 | $5M | 0.3% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 55,096 | $4M | 0.3% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 53,319 | $4M | 0.2% | 2026-Q2 |
| ZACKS INVESTMENT MANAGEMENT added | 52,989 | $4M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 47,700 | $4M | 0.2% | 2026-Q2 |
| INTECH INVESTMENT MANAGEMENT LLC added | 45,776 | $4M | 0.2% | 2026-Q2 |
| Campbell & CO Investment Adviser LLC added | 42,798 | $3M | 0.2% | 2026-Q2 |
| HUSSMAN STRATEGIC ADVISORS, INC. trimmed | 42,000 | $3M | 0.2% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 39,013 | $3M | 0.2% | 2026-Q2 |
| AIMZ Investment Advisors, LLC | 38,728 | $3M | 0.2% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 37,033 | $3M | 0.2% | 2026-Q2 |
| ALGERT GLOBAL LLC added | 36,695 | $3M | 0.2% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 36,457 | $3M | 0.2% | 2026-Q2 |
| ARK Investment Management LLC trimmed | 35,418 | $3M | 0.2% | 2026-Q2 |
| POLEN CAPITAL MANAGEMENT LLC trimmed | 35,011 | $3M | 0.2% | 2026-Q2 |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC added | 33,760 | $3M | 0.2% | 2026-Q2 |
| ExodusPoint Capital Management, LP added | 33,683 | $3M | 0.2% | 2026-Q2 |
| Quantinno Capital Management LP added | 32,730 | $3M | 0.2% | 2026-Q2 |
| FEDERATED HERMES, INC. added | 32,144 | $3M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 31,308 | $3M | 0.1% | 2026-Q2 |
| AEGON ASSET MANAGEMENT UK Plc new | 31,000 | $3M | 0.1% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 30,839 | $3M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 27,640 | $2M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 27,044 | $2M | 0.1% | 2026-Q2 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 27,000 | $2M | 0.1% | 2026-Q2 |
| Engineers Gate Manager LP added | 26,780 | $2M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ trimmed | 25,119 | $2M | 0.1% | 2026-Q2 |
| HSBC HOLDINGS PLC added | 24,699 | $2M | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 24,633 | $2M | 0.1% | 2026-Q2 |
| SEI INVESTMENTS CO added | 24,075 | $2M | 0.1% | 2026-Q2 |
| GILDER GAGNON HOWE & CO LLC added | 21,274 | $2M | 0.1% | 2026-Q2 |
| GABELLI FUNDS LLC | 21,132 | $2M | 0.1% | 2026-Q2 |
| SG Capital Management LLC trimmed | 20,068 | $2M | 0.1% | 2026-Q2 |
| TEACHER RETIREMENT SYSTEM OF TEXAS trimmed | 18,885 | $2M | 0.1% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 18,166 | $1M | 0.1% | 2026-Q2 |
| MARSHALL WACE, LLP trimmed | 16,921 | $1M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 16,856 | $1M | 0.1% | 2026-Q2 |
| Squarepoint Ops LLC trimmed | 16,439 | $1M | 0.1% | 2026-Q2 |
| State of Wyoming added | 16,370 | $1M | 0.1% | 2026-Q2 |
| CAPTRUST FINANCIAL ADVISORS added | 15,935 | $1M | 0.1% | 2026-Q2 |
| Trexquant Investment LP trimmed | 14,219 | $1M | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 14,086 | $1M | 0.1% | 2026-Q2 |
| Marks Group Wealth Management, Inc added | 13,991 | $1M | 0.1% | 2026-Q2 |
| Jump Financial, LLC added | 13,194 | $1M | 0.1% | 2026-Q2 |
| State of Tennessee, Department of Treasury trimmed | 13,028 | $1M | 0.1% | 2026-Q2 |
| Haven Private, LLC trimmed | 12,966 | $1M | 0.1% | 2026-Q2 |
| BAILARD, INC. trimmed | 12,881 | $1M | 0.1% | 2026-Q2 |
| Illinois Municipal Retirement Fund trimmed | 12,869 | $1M | 0.1% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 12,734 | $1M | 0.1% | 2026-Q2 |
| Creative Planning added | 12,369 | $1M | 0.1% | 2026-Q2 |
| STRS OHIO trimmed | 12,300 | $1M | 0.1% | 2026-Q2 |
| Assenagon Asset Management S.A. trimmed | 12,238 | $998K | 0.1% | 2026-Q2 |
| Jupiter Topco LLC new | 12,216 | $996K | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.