PROTO LABS INC (PRLB) Institutional Shareholders
PROTO LABS INC (PRLB) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $1.33B in PRLB holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of PRLB tracked by InsiderSet, reporting ownership valued at approximately $209.71M 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 $276.02M, representing an estimated gain of +31.62% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 61% of the total disclosed PRLB value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Disciplined Growth Investors, Vanguard Portfolio Management Llc, and several other long-term asset managers with concentrated positions in PROTO LABS INC (PRLB).
This page ranks the largest institutional PRLB 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
263
Total Reported Value
$1.33B
Largest Holder
Blackrock, Inc.
Largest Position
$209.71M
Insider Transactions (90d)
11
Latest Filing Quarter
Q2 2026
New Institutional Positions
113
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 3,677,875 | $209,712,432 | $276,024,519 | +$66,312,087 | +31.62% | |
| Disciplined Growth Investors | Fred Martin | 2.91% | 2,497,355 | $142,399,182 | $187,426,493 | +$45,027,311 | +31.62% |
| Vanguard Portfolio Management Llc | 0.00% | 1,538,530 | $87,726,981 | $115,466,677 | +$27,739,696 | +31.62% | |
| Storebrand Asset Management As | 0.03% | 713,609 | $81,027,012 | $53,556,355 | -$27,470,657 | -33.90% | |
| Dimensional Fund Advisors Lp | 0.02% | 1,272,356 | $72,547,694 | $95,490,318 | +$22,942,624 | +31.62% | |
| State Street Corp | 0.00% | 1,092,000 | $62,265,840 | $81,954,600 | +$19,688,760 | +31.62% | |
| Vanguard Capital Management Llc | 0.00% | 1,039,741 | $59,286,032 | $78,032,562 | +$18,746,530 | +31.62% | |
| American Capital Management Inc | 1.92% | 627,705 | $35,791,739 | $47,109,260 | +$11,317,521 | +31.62% | |
| Geode Capital Management, Llc | 0.00% | 580,201 | $33,089,796 | $43,544,085 | +$10,454,289 | +31.59% | |
| Renaissance Technologies LLC | Jim Simons | 0.05% | 520,251 | $29,664,712 | $39,044,838 | +$9,380,126 | +31.62% |
| Rubric Capital Management Lp | 0.34% | 486,400 | $27,734,528 | $36,504,320 | +$8,769,792 | +31.62% | |
| Arrowstreet Capital, Limited Partnership | 0.01% | 463,780 | $26,444,736 | $34,806,689 | +$8,361,953 | +31.62% | |
| Fmr Llc | 0.00% | 422,356 | $24,082,734 | $31,697,818 | +$7,615,084 | +31.62% | |
| Prudential Financial Inc | 0.03% | 400,241 | $22,821,742 | $30,038,087 | +$7,216,345 | +31.62% | |
| Driehaus Capital Management Llc | 0.15% | 369,136 | $21,048,135 | $27,703,657 | +$6,655,522 | +31.62% | |
| Charles Schwab Investment Management Inc | 0.00% | 360,203 | $20,538,775 | $27,033,235 | +$6,494,460 | +31.62% | |
| Nuveen, Llc | 0.00% | 316,939 | $18,071,862 | $23,786,272 | +$5,714,410 | +31.62% | |
| S Squared Technology, Llc | 6.39% | 296,103 | $16,883,793 | $22,222,530 | +$5,338,737 | +31.62% | |
| Morgan Stanley | 0.00% | 293,581 | $16,740,055 | $22,033,254 | +$5,293,199 | +31.62% | |
| Northern Trust Corp | 0.00% | 266,951 | $15,221,546 | $20,034,673 | +$4,813,127 | +31.62% | |
| D. E. Shaw & Co., Inc. | 0.01% | 225,651 | $12,866,620 | $16,935,108 | +$4,068,488 | +31.62% | |
| Nordea Investment Management Ab | 0.01% | 214,381 | $11,992,473 | $16,089,294 | +$4,096,821 | +34.16% | |
| Jupiter Asset Management Ltd | 0.06% | 194,832 | $11,109,321 | $14,622,142 | +$3,512,821 | +31.62% | |
| Panagora Asset Management Inc | 0.04% | 174,698 | $9,961,280 | $13,111,085 | +$3,149,805 | +31.62% | |
| Hillsdale Investment Management Inc. | 0.27% | 174,384 | $9,943,376 | $13,087,519 | +$3,144,143 | +31.62% | |
| Ubs Group Ag | 0.00% | 168,750 | $9,622,125 | $12,664,688 | +$3,042,563 | +31.62% | |
| Vanguard Fiduciary Trust Co | 0.00% | 153,581 | $8,757,189 | $11,526,254 | +$2,769,065 | +31.62% | |
| Qube Research & Technologies Ltd | 0.01% | 148,622 | $8,474,426 | $11,154,081 | +$2,679,655 | +31.62% | |
| Goldman Sachs Group Inc | 0.00% | 140,943 | $8,036,569 | $10,577,772 | +$2,541,203 | +31.62% | |
| Bank Of New York Mellon Corp | 0.00% | 139,917 | $7,978,096 | $10,500,771 | +$2,522,675 | +31.62% | |
| Principal Financial Group Inc | 0.00% | 133,613 | $7,618,613 | $10,027,656 | +$2,409,043 | +31.62% | |
| Bank Of America Corp | 0.00% | 129,113 | $7,362,023 | $9,689,931 | +$2,327,908 | +31.62% | |
| Connor, Clark & Lunn Investment Management Ltd. | 0.02% | 125,510 | $7,156,580 | $9,419,526 | +$2,262,946 | +31.62% | |
| Rice Hall James & Associates, Llc | 0.36% | 113,589 | $6,476,845 | $8,524,854 | +$2,048,009 | +31.62% | |
| Gagnon Securities Llc | 1.46% | 110,889 | $6,322,891 | $8,322,219 | +$1,999,328 | +31.62% | |
| Public Sector Pension Investment Board | 0.02% | 105,560 | $6,019,031 | $7,922,278 | +$1,903,247 | +31.62% | |
| Lazard Asset Management Llc | 0.01% | 99,333 | $5,663,968 | $7,454,942 | +$1,790,974 | +31.62% | |
| First Trust Advisors Lp | 0.00% | 92,870 | $5,295,447 | $6,969,894 | +$1,674,447 | +31.62% | |
| Invesco Ltd. | 0.00% | 88,576 | $5,050,604 | $6,647,629 | +$1,597,025 | +31.62% | |
| American Century Companies Inc | 0.00% | 78,842 | $4,495,571 | $5,917,092 | +$1,421,521 | +31.62% | |
| Trexquant Investment Lp | 0.03% | 68,688 | $3,916,590 | $5,155,034 | +$1,238,444 | +31.62% | |
| Marshall Wace, Llp | 0.00% | 68,355 | $3,897,602 | $5,130,043 | +$1,232,441 | +31.62% | |
| Informed Momentum Co Llc | 0.43% | 65,823 | $3,753,227 | $4,940,016 | +$1,186,789 | +31.62% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.00% | 65,741 | $3,748,552 | $4,933,862 | +$1,185,310 | +31.62% | |
| Rhumbline Advisers | 0.00% | 65,114 | $3,712,781 | $4,886,806 | +$1,174,025 | +31.62% | |
| Polar Asset Management Partners Inc. | 0.08% | 60,369 | $3,442,240 | $4,530,693 | +$1,088,453 | +31.62% | |
| Ameriprise Financial Inc | 0.00% | 58,539 | $3,337,893 | $4,393,352 | +$1,055,459 | +31.62% | |
| Legal & General Group Plc | 0.00% | 58,401 | $3,330,026 | $4,382,995 | +$1,052,969 | +31.62% | |
| Jane Street Group, Llc | 0.00% | 57,355 | $3,270,383 | $4,304,493 | +$1,034,110 | +31.62% | |
| Franklin Resources Inc | 0.00% | 56,959 | $3,247,802 | $4,274,773 | +$1,026,971 | +31.62% |
Frequently asked questions about PRLB
Who owns the most PRLB stock?
The largest holders of PRLB 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 PROTO LABS INC (PRLB).
Is PRLB widely held by superinvestors?
Many widely followed stocks like PRLB appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly PRLB 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.