Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in APT held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | NEEDHAM INVESTMENT MANAGEMENT LLC | 643K | $2.9M | 0.0% | 6.289% | 0.15% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 554K | $2.5M | β | 5.419% | 0.00% |
| 3 | RENAISSANCE TECHNOLOGIES LLC | 544K | $2.4M | +4.0% | 5.325% | 0.00% |
| 4 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 420K | $1.9M | +121.3% | 4.112% | 0.00% |
| 5 | BlackRock, Inc. | 272K | $1.2M | +0.5% | 2.660% | 0.00% |
| 6 | DIMENSIONAL FUND ADVISORS LP | 137K | $610K | 0.0% | 1.344% | 0.00% |
| 7 | GROUP ONE TRADING, L.P. | 113K | $502K | β | 1.107% | 0.02% |
| 8 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 79K | $349K | 0.0% | 0.769% | 0.01% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 68K | $304K | -26.4% | 0.669% | 0.00% |
| 10 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 58K | $259K | 0.0% | 0.571% | 0.00% |
| 11 | VANGUARD FIDUCIARY TRUST CO | 51K | $228K | β | 0.503% | 0.00% |
| 12 | STATE STREET CORP | 47K | $208K | 0.0% | 0.460% | 0.00% |
| 13 | ESSEX INVESTMENT MANAGEMENT CO LLC | 34K | $153K | 0.0% | 0.337% | 0.02% |
| 14 | Pinnacle Financial Partners, Inc. | 25K | $111K | 0.0% | 0.245% | 0.00% |
| 15 | NORTHERN TRUST CORP | 18K | $80K | 0.0% | 0.177% | 0.00% |
| 16 | CALDWELL SUTTER CAPITAL, INC. | 16K | $72K | 0.0% | 0.159% | 0.03% |
| 17 | XTX Topco Ltd | 15K | $65K | β | 0.144% | 0.00% |
| 18 | JAMES INVESTMENT RESEARCH INC | 11K | $49K | 0.0% | 0.108% | 0.01% |
| 19 | MORGAN STANLEY | 9K | $39K | 0.0% | 0.086% | 0.00% |
| 20 | ADVISOR GROUP HOLDINGS, INC. | 5K | $21K | -79.6% | 0.047% | 0.00% |
| 21 | Vanguard Global Advisers, LLC | 4K | $18K | β | 0.039% | 0.00% |
| 22 | WELLS FARGO & COMPANY/MN | 3K | $13K | +0.0% | 0.029% | 0.00% |
| 23 | Tower Research Capital LLC (TRC) | 642 | $3K | -44.0% | 0.006% | 0.00% |
| 24 | BARCLAYS PLC | 426 | $2K | 0.0% | 0.004% | 0.00% |
| 25 | Farther Finance Advisors, LLC | 363 | $2K | β | 0.004% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in APT β a direct measure of their conviction.
Filings activity in APT during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new APT position in Q1 2026
Institutions that fully closed their APT position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 34 | +0.0% | 25.41% | +2.39 pp | $14M | +10% |
| Q4 2025 | 34 | 11% | 23.02% | 3.61 pp | $13M | 14% |
| Q3 2025 | 38 | +8.6% | 26.63% | 0.18 pp | $15M | 0.6% |
| Q2 2025 | 35 | +0.0% | 26.81% | 0.54 pp | $15M | 2.0% |
| Q1 2025 | 35 | +17% | 27.35% | 0.67 pp | $15M | 2.4% |
| Q4 2024 | 30 | 12% | 28.02% | 3.82 pp | $15M | 12% |
| Q3 2024 | 34 | 8.1% | 31.84% | +1.32 pp | $17M | +4.4% |
| Q2 2024 | 37 | β | 30.52% | β | $17M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying APT stock.
Based on Q1 2026 13F filings, institutional ownership of Alpha Pro Tech, Ltd. stands at 25.4%, held across 34 reporting institutions.
NEEDHAM INVESTMENT MANAGEMENT LLC is the largest reported institutional holder of APT, with approximately 642,500 shares worth $0.00B as of Q1 2026.
Yes β 2 widely-followed marquee investors appear among the top 25 institutional holders of APT, including RENAISSANCE TECHNOLOGIES LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP.
Our composite Smart Money Score for APT is 65 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
7 institutions opened new positions in APT during Q1 2026, while 7 fully exited. 6 added to existing positions and 4 trimmed.
APT institutional ownership rose by 2.39 percentage points quarter-over-quarter, with a net change of +0 holders.
The top 10 institutions account for 92.3% of all reported 13F value in APT, and the top 25 account for 100.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Alpha Pro Tech, Ltd. (APT) Institutional Ownership