Who owns PRLB (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-Q1 13F filings. 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 2025-Q4 and 2026-Q1: 76 added or opened and 24 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, DISCIPLINED GROWTH INVESTORS INC /MN, sizes it at 2.9% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 2.9pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
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 2025-Q4 and 2026-Q1, across 261 tracked filers holding PRLB, 126 increased or opened the position and 109 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 2025-Q4 and 2026-Q1 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 25
- VANGUARD PORTFOLIO MANAGEMENT LLC$88M
- VANGUARD CAPITAL MANAGEMENT LLC$59M
- VANGUARD FIDUCIARY TRUST CO$9M
- MARSHALL WACE, LLP$4M
- Informed Momentum Co LLC$4M
- HUSSMAN STRATEGIC ADVISORS, INC.$3M
Full exits 9
- VANGUARD GROUP INC$126M
- Empowered Funds, LLC$6M
- CWA Asset Management Group, LLC$2M
- VIRGINIA RETIREMENT SYSTEMS ET Al$1M
- ESSEX INVESTMENT MANAGEMENT CO LLC$784K
- Verition Fund Management LLC$739K
Largest adds
- FMR LLC$18M
- PRUDENTIAL FINANCIAL INC$14M
- DIMENSIONAL FUND ADVISORS LP$8M
- Qube Research & Technologies Ltd$8M
- STATE STREET CORP$7M
- DISCIPLINED GROWTH INVESTORS INC /MN$7M
Largest trims
- BlackRock, Inc.$41M
- Rubric Capital Management LP$29M
- BRIDGEWAY CAPITAL MANAGEMENT, LLC$5M
- MILLENNIUM MANAGEMENT LLC$4M
- JANE STREET GROUP, LLC$2M
- Pacer Advisors, Inc.$2M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| DISCIPLINED GROWTH INVESTORS INC /MN trimmed | 2,497,355 | $142M | 10.7% | 2026-Q1 |
| BlackRock, Inc. trimmed | 2,488,836 | $142M | 10.7% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 1,538,530 | $88M | 6.6% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 1,272,356 | $73M | 5.5% | 2026-Q1 |
| STATE STREET CORP added | 1,092,000 | $62M | 4.7% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,039,741 | $59M | 4.5% | 2026-Q1 |
| AMERICAN CAPITAL MANAGEMENT INC trimmed | 627,705 | $36M | 2.7% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 580,201 | $33M | 2.5% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 520,251 | $30M | 2.2% | 2026-Q1 |
| Rubric Capital Management LP trimmed | 486,400 | $28M | 2.1% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 463,780 | $26M | 2.0% | 2026-Q1 |
| FMR LLC added | 422,147 | $24M | 1.8% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC added | 400,241 | $23M | 1.7% | 2026-Q1 |
| Driehaus Capital Management LLC trimmed | 369,136 | $21M | 1.6% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 360,203 | $21M | 1.5% | 2026-Q1 |
| Nuveen, LLC trimmed | 316,939 | $18M | 1.4% | 2026-Q1 |
| S SQUARED TECHNOLOGY, LLC trimmed | 296,103 | $17M | 1.3% | 2026-Q1 |
| MORGAN STANLEY trimmed | 293,581 | $17M | 1.3% | 2026-Q1 |
| NORTHERN TRUST CORP added | 266,951 | $15M | 1.1% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 225,651 | $13M | 1.0% | 2026-Q1 |
| NORDEA INVESTMENT MANAGEMENT AB trimmed | 214,381 | $12M | 0.9% | 2026-Q1 |
| JUPITER ASSET MANAGEMENT LTD | 194,832 | $11M | 0.8% | 2026-Q1 |
| PANAGORA ASSET MANAGEMENT INC trimmed | 174,698 | $10M | 0.8% | 2026-Q1 |
| Hillsdale Investment Management Inc. added | 174,384 | $10M | 0.7% | 2026-Q1 |
| UBS Group AG trimmed | 168,750 | $10M | 0.7% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 153,581 | $9M | 0.7% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 148,622 | $8M | 0.6% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 140,943 | $8M | 0.6% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 139,917 | $8M | 0.6% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC trimmed | 133,613 | $8M | 0.6% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 129,113 | $7M | 0.6% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. trimmed | 125,510 | $7M | 0.5% | 2026-Q1 |
| RICE HALL JAMES & ASSOCIATES, LLC trimmed | 113,589 | $6M | 0.5% | 2026-Q1 |
| GAGNON SECURITIES LLC trimmed | 110,889 | $6M | 0.5% | 2026-Q1 |
| Public Sector Pension Investment Board trimmed | 105,560 | $6M | 0.5% | 2026-Q1 |
| LAZARD ASSET MANAGEMENT LLC added | 99,333 | $6M | 0.4% | 2026-Q1 |
| FIRST TRUST ADVISORS LP trimmed | 92,870 | $5M | 0.4% | 2026-Q1 |
| Invesco Ltd. trimmed | 88,576 | $5M | 0.4% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 87,579 | $5M | 0.4% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC trimmed | 78,842 | $4M | 0.3% | 2026-Q1 |
| Trexquant Investment LP added | 68,688 | $4M | 0.3% | 2026-Q1 |
| MARSHALL WACE, LLP added | 67,854 | $4M | 0.3% | 2026-Q1 |
| Informed Momentum Co LLC added | 65,823 | $4M | 0.3% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 65,741 | $4M | 0.3% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 65,114 | $4M | 0.3% | 2026-Q1 |
| Polar Asset Management Partners Inc. trimmed | 60,369 | $3M | 0.3% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 58,539 | $3M | 0.3% | 2026-Q1 |
| Legal & General Group Plc trimmed | 58,401 | $3M | 0.3% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 57,355 | $3M | 0.2% | 2026-Q1 |
| FRANKLIN RESOURCES INC added | 56,959 | $3M | 0.2% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 54,350 | $3M | 0.2% | 2026-Q1 |
| HUSSMAN STRATEGIC ADVISORS, INC. added | 52,500 | $3M | 0.2% | 2026-Q1 |
| Archon Capital Management LLC new | 48,500 | $3M | 0.2% | 2026-Q1 |
| ZACKS INVESTMENT MANAGEMENT added | 47,586 | $3M | 0.2% | 2026-Q1 |
| Swiss National Bank | 47,100 | $3M | 0.2% | 2026-Q1 |
| GSA CAPITAL PARTNERS LLP added | 46,960 | $3M | 0.2% | 2026-Q1 |
| Assenagon Asset Management S.A. added | 46,776 | $3M | 0.2% | 2026-Q1 |
| ARK Investment Management LLC trimmed | 45,704 | $3M | 0.2% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 44,518 | $3M | 0.2% | 2026-Q1 |
| Squarepoint Ops LLC added | 41,320 | $2M | 0.2% | 2026-Q1 |
| INTECH INVESTMENT MANAGEMENT LLC added | 38,971 | $2M | 0.2% | 2026-Q1 |
| AIMZ Investment Advisors, LLC trimmed | 38,728 | $2M | 0.2% | 2026-Q1 |
| POLEN CAPITAL MANAGEMENT LLC added | 37,594 | $2M | 0.2% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 33,169 | $2M | 0.1% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 32,389 | $2M | 0.1% | 2026-Q1 |
| Integrated Quantitative Investments LLC new | 31,505 | $2M | 0.1% | 2026-Q1 |
| FEDERATED HERMES, INC. added | 31,371 | $2M | 0.1% | 2026-Q1 |
| VOYA INVESTMENT MANAGEMENT LLC trimmed | 30,139 | $2M | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 30,070 | $2M | 0.1% | 2026-Q1 |
| Bastion Asset Management Inc. new | 28,270 | $2M | 0.1% | 2026-Q1 |
| Quantinno Capital Management LP added | 27,716 | $2M | 0.1% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 25,829 | $1M | 0.1% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC trimmed | 24,497 | $1M | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 22,967 | $1M | 0.1% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC trimmed | 22,000 | $1M | 0.1% | 2026-Q1 |
| GILDER GAGNON HOWE & CO LLC new | 21,267 | $1M | 0.1% | 2026-Q1 |
| GABELLI FUNDS LLC | 21,132 | $1M | 0.1% | 2026-Q1 |
| TEACHER RETIREMENT SYSTEM OF TEXAS trimmed | 20,920 | $1M | 0.1% | 2026-Q1 |
| Quantbot Technologies LP added | 20,782 | $1M | 0.1% | 2026-Q1 |
| CANADA LIFE ASSURANCE Co | 19,845 | $1M | 0.1% | 2026-Q1 |
| Edgestream Partners, L.P. trimmed | 19,015 | $1M | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. | 20,740 | $1M | 0.1% | 2026-Q1 |
| HRT FINANCIAL LP trimmed | 18,081 | $1M | 0.1% | 2026-Q1 |
| State of Tennessee, Department of Treasury | 17,728 | $1M | 0.1% | 2026-Q1 |
| XTX Topco Ltd added | 15,873 | $905K | 0.1% | 2026-Q1 |
| Thrivent Financial for Lutherans trimmed | 15,805 | $901K | 0.1% | 2026-Q1 |
| CAPTRUST FINANCIAL ADVISORS trimmed | 15,800 | $901K | 0.1% | 2026-Q1 |
| Pacer Advisors, Inc. trimmed | 23,216 | $901K | 0.1% | 2026-Q1 |
| Tidal Investments LLC added | 15,558 | $887K | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 2,487,196 | $126M | 9.5% | 2025-Q4 stale |
| WELLINGTON MANAGEMENT GROUP LLP added | 711,738 | $25M | 1.9% | 2025-Q1 stale |
| NORGES BANK added | 259,045 | $9M | 0.7% | 2025-Q1 stale |
| Empowered Funds, LLC added | 112,876 | $6M | 0.4% | 2025-Q4 stale |
| SG Capital Management LLC added | 113,587 | $6M | 0.4% | 2025-Q3 stale |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC trimmed | 152,100 | $5M | 0.4% | 2025-Q1 stale |
| Cubist Systematic Strategies, LLC trimmed | 68,614 | $3M | 0.2% | 2025-Q2 stale |
| CWA Asset Management Group, LLC added | 41,508 | $2M | 0.2% | 2025-Q4 stale |
| Y-Intercept (Hong Kong) Ltd trimmed | 26,616 | $1M | 0.1% | 2025-Q3 stale |
| VIRGINIA RETIREMENT SYSTEMS ET Al trimmed | 23,400 | $1M | 0.1% | 2025-Q4 stale |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 31,700 | $1M | 0.1% | 2025-Q1 stale |
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.