Skip to main content
PRLB logo

PRLB · Proto Labs Inc

Track PRLB — free
Market Cap
$1.88B
Shares
23.92M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 277
Total Value: $1,833,220,970
Total Shares: 22,499,581
Showing 1–100 of 281 holdings by value · page 1 of 3

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 277 13F filers · Δ vs Mar 31, 2026
Top Holder
17.3%
Sep 2023 → Jun 2026 · range 16.5% – 20.4%
+0.8 pts
Top 5
45.2%
Sep 2023 → Jun 2026 · range 45.2% – 53.7%
−0.1 pts
Top 10
59.5%
Sep 2023 → Jun 2026 · range 59.5% – 67.7%
−0.5 pts
HHI
597
Sep 2023 → Jun 2026 · range 586 – 781
Broadly held+11

Quarterly Activity

vs Mar 31, 2026
New
44
Increased
101
Decreased
90
Sold Out
31
Unchanged
42
Holder count: +13
Institutional value: +44.6%
Shares held: +1.2%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 281
Export CSV
Holder Value (USD) % of 13F Shares Open
Key facts CIK 1443669 CUSIP 743713109 13F (30d) 219 filings 218 filers Visit website Investor relations