Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ADTN held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 7.8M | $98.6M | -3.5% | 9.716% | 0.00% |
| 2 | VANGUARD PORTFOLIO MANAGEMENT LLC | 4.8M | $60.0M | β | 5.913% | 0.00% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 3.4M | $43.1M | β | 4.246% | 0.00% |
| 4 | ROYCE & ASSOCIATES LP | 3.1M | $39.3M | +20.4% | 3.875% | 0.39% |
| 5 | DnB Asset Management AS | 3.1M | $39.3M | 0.0% | 3.871% | 0.14% |
| 6 | STATE STREET CORP | 2.4M | $29.6M | +18.4% | 2.913% | 0.00% |
| 7 | WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 2.0M | $25.0M | -19.7% | 2.465% | 0.08% |
| 8 | MILLENNIUM MANAGEMENT LLC | 1.9M | $23.9M | -29.6% | 2.350% | 0.02% |
| 9 | MORGAN STANLEY | 1.8M | $23.1M | +36.4% | 2.271% | 0.00% |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | 1.8M | $22.9M | +3.0% | 2.254% | 0.00% |
| 11 | Divisar Capital Management LLC | 1.8M | $22.3M | -40.8% | 2.193% | 5.67% |
| 12 | First Eagle Investment Management, LLC | 1.4M | $17.2M | +10.8% | 1.696% | 0.02% |
| 13 | DIMENSIONAL FUND ADVISORS LP | 1.3M | $16.8M | +50.5% | 1.657% | 0.00% |
| 14 | NEEDHAM INVESTMENT MANAGEMENT LLC | 1.2M | $15.5M | -15.1% | 1.522% | 0.79% |
| 15 | Shannon River Fund Management LLC | 1.2M | $15.3M | β | 1.512% | 2.93% |
| 16 | D. E. Shaw & Co., Inc. | 1.2M | $15.3M | +1.7% | 1.510% | 0.01% |
| 17 | Boston Partners | 1.2M | $14.9M | β | 1.464% | 0.02% |
| 18 | TWO SIGMA INVESTMENTS, LP | 1.1M | $14.1M | +1492.9% | 1.392% | 0.01% |
| 19 | SEI INVESTMENTS CO | 1.1M | $13.9M | +162.0% | 1.369% | 0.01% |
| 20 | Invesco Ltd. | 991K | $12.5M | +301.5% | 1.228% | 0.00% |
| 21 | GOLDMAN SACHS GROUP INC | 971K | $12.2M | +86.2% | 1.203% | 0.00% |
| 22 | BARCLAYS PLC | 928K | $11.7M | -17.6% | 1.150% | 0.00% |
| 23 | FEDERATED HERMES, INC. | 923K | $11.6M | +6.5% | 1.143% | 0.02% |
| 24 | MARSHALL WACE, LLP | 892K | $11.2M | β | 1.105% | 0.01% |
| 25 | Squarepoint Ops LLC | 888K | $11.2M | +11.3% | 1.100% | 0.01% |
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 ADTN β a direct measure of their conviction.
Filings activity in ADTN during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new ADTN position in Q1 2026
Institutions that fully closed their ADTN 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 | 221 | +4.7% | 75.01% | +27.44 pp | $924M | +58% |
| Q4 2025 | 211 | 1.9% | 47.57% | 4.46 pp | $586M | 8.6% |
| Q3 2025 | 215 | +13% | 52.03% | +10.66 pp | $641M | +26% |
| Q2 2025 | 191 | 3.5% | 41.37% | +1.88 pp | $509M | +4.8% |
| Q1 2025 | 198 | +25% | 39.49% | 0.56 pp | $486M | 1.4% |
| Q4 2024 | 159 | +6.7% | 40.05% | +14.11 pp | $493M | +54% |
| Q3 2024 | 149 | 3.2% | 25.94% | +2.90 pp | $319M | +13% |
| Q2 2024 | 154 | β | 23.04% | β | $284M | 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 ADTN stock.
Based on Q1 2026 13F filings, institutional ownership of ADTRAN Holdings, Inc. stands at 75.0%, held across 221 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of ADTN, with approximately 7,840,254 shares worth $0.10B as of Q1 2026.
Yes β 2 widely-followed marquee investors appear among the top 25 institutional holders of ADTN, including MILLENNIUM MANAGEMENT LLC, TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for ADTN is 67 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
47 institutions opened new positions in ADTN during Q1 2026, while 37 fully exited. 153 added to existing positions and 21 trimmed.
ADTN institutional ownership rose by 27.44 percentage points quarter-over-quarter, with a net change of +10 holders.
The top 10 institutions account for 43.8% of all reported 13F value in ADTN, and the top 25 account for 67.2%.
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.
ADTRAN Holdings, Inc. (ADTN) Institutional Ownership