Who owns ADTRAN Holdings (ADTN)
Which tracked institutional funds hold ADTN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ADTN company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 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
76 tracked funds added or opened ADTN while 49 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
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
ADTN’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes ADTN more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in ADTN 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 2026-Q1 and 2026-Q2, across 238 tracked filers holding ADTN, 142 increased or opened the position and 109 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
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 ADTN between the 2026-Q1 and 2026-Q2 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 17
- NORGES BANK$8M
- HENNESSY ADVISORS INC$7M
- HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND$5M
- BALYASNY ASSET MANAGEMENT L.P.$4M
- GRATIA CAPITAL, LLC$3M
- NFJ INVESTMENT GROUP, LLC$3M
Full exits 15
- SG Americas Securities, LLC$17M
- Shannon River Fund Management LLC$15M
- Tieton Capital Management, LLC$13M
- PARADIGM CAPITAL MANAGEMENT INC/NY$9M
- HRT FINANCIAL LP$7M
- CRAMER ROSENTHAL MCGLYNN LLC$4M
Largest adds
- UBS Group AG$38M
- TWO SIGMA INVESTMENTS, LP$26M
- RENAISSANCE TECHNOLOGIES LLC$22M
- JPMORGAN CHASE & CO$18M
- Qube Research & Technologies Ltd$16M
- MILLENNIUM MANAGEMENT LLC$14M
Largest trims
- Divisar Capital Management LLC$10M
- WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC$10M
- NEEDHAM INVESTMENT MANAGEMENT LLC$9M
- Invesco Ltd.$8M
- SEI INVESTMENTS CO$8M
- Kerrisdale Advisers, LLC$6M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. trimmed | 7,836,196 | $109M | 9.9% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 5,135,649 | $71M | 6.5% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 3,510,271 | $49M | 4.4% | 2026-Q2 |
| STATE STREET CORP added | 3,082,794 | $43M | 3.9% | 2026-Q2 |
| ROYCE & ASSOCIATES LP trimmed | 2,972,917 | $41M | 3.8% | 2026-Q2 |
| UBS Group AG added | 2,940,724 | $41M | 3.7% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 2,896,353 | $40M | 3.7% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 2,722,820 | $38M | 3.4% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 2,623,057 | $36M | 3.3% | 2026-Q2 |
| DNB Asset Management AS trimmed | 2,619,389 | $36M | 3.3% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,958,052 | $27M | 2.5% | 2026-Q2 |
| MORGAN STANLEY trimmed | 1,792,752 | $25M | 2.3% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC added | 1,773,740 | $25M | 2.2% | 2026-Q2 |
| Boston Partners added | 1,651,038 | $23M | 2.1% | 2026-Q2 |
| Qube Research & Technologies Ltd added | 1,398,913 | $19M | 1.8% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 1,366,243 | $19M | 1.7% | 2026-Q2 |
| First Eagle Investment Management, LLC trimmed | 1,248,507 | $17M | 1.6% | 2026-Q2 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC trimmed | 1,099,019 | $15M | 1.4% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 1,091,898 | $15M | 1.4% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 1,045,037 | $15M | 1.3% | 2026-Q2 |
| MARSHALL WACE, LLP added | 1,038,292 | $14M | 1.3% | 2026-Q2 |
| FMR LLC added | 1,011,195 | $14M | 1.3% | 2026-Q2 |
| Assenagon Asset Management S.A. added | 917,754 | $13M | 1.2% | 2026-Q2 |
| Divisar Capital Management LLC trimmed | 851,526 | $12M | 1.1% | 2026-Q2 |
| FEDERATED HERMES, INC. trimmed | 849,967 | $12M | 1.1% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 845,421 | $12M | 1.1% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 786,873 | $11M | 1.0% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 764,780 | $11M | 1.0% | 2026-Q2 |
| HEARTLAND ADVISORS INC | 750,000 | $10M | 0.9% | 2026-Q2 |
| NORTHERN TRUST CORP added | 734,960 | $10M | 0.9% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 714,068 | $10M | 0.9% | 2026-Q2 |
| Nuveen, LLC added | 700,147 | $10M | 0.9% | 2026-Q2 |
| Kovack Advisors, Inc. trimmed | 696,210 | $9M | 0.9% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 671,403 | $9M | 0.8% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. added | 629,119 | $9M | 0.8% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 625,245 | $9M | 0.8% | 2026-Q2 |
| Squarepoint Ops LLC trimmed | 617,388 | $9M | 0.8% | 2026-Q2 |
| NORGES BANK added | 575,400 | $8M | 0.7% | 2026-Q2 |
| 1492 Capital Management LLC trimmed | 573,128 | $8M | 0.7% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL trimmed | 541,455 | $8M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 540,877 | $8M | 0.7% | 2026-Q2 |
| Counterpoint Mutual Funds LLC added | 529,866 | $7M | 0.7% | 2026-Q2 |
| HENNESSY ADVISORS INC new | 526,300 | $7M | 0.7% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 504,227 | $7M | 0.6% | 2026-Q2 |
| NOMURA HOLDINGS INC added | 502,322 | $7M | 0.6% | 2026-Q2 |
| WESTERLY CAPITAL MANAGEMENT, LLC trimmed | 500,000 | $7M | 0.6% | 2026-Q2 |
| BARCLAYS PLC trimmed | 479,197 | $7M | 0.6% | 2026-Q2 |
| Trexquant Investment LP trimmed | 472,733 | $7M | 0.6% | 2026-Q2 |
| NEEDHAM INVESTMENT MANAGEMENT LLC trimmed | 450,000 | $6M | 0.6% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 403,253 | $6M | 0.5% | 2026-Q2 |
| Y-Intercept (Hong Kong) Ltd added | 370,294 | $5M | 0.5% | 2026-Q2 |
| MACKENZIE FINANCIAL CORP trimmed | 352,438 | $5M | 0.4% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND added | 330,100 | $5M | 0.4% | 2026-Q2 |
| JANE STREET GROUP, LLC added | 281,868 | $4M | 0.4% | 2026-Q2 |
| WHITE PINE CAPITAL LLC trimmed | 279,072 | $4M | 0.4% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. added | 275,489 | $4M | 0.3% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 266,134 | $4M | 0.3% | 2026-Q2 |
| Bank of New York Mellon Corp added | 255,026 | $4M | 0.3% | 2026-Q2 |
| GRATIA CAPITAL, LLC new | 250,492 | $3M | 0.3% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 238,878 | $3M | 0.3% | 2026-Q2 |
| Invesco Ltd. trimmed | 236,765 | $3M | 0.3% | 2026-Q2 |
| DEUTSCHE BANK AG\ trimmed | 235,833 | $3M | 0.3% | 2026-Q2 |
| ALGERT GLOBAL LLC | 228,160 | $3M | 0.3% | 2026-Q2 |
| NFJ INVESTMENT GROUP, LLC new | 208,413 | $3M | 0.3% | 2026-Q2 |
| Walleye Trading LLC added | 208,278 | $3M | 0.3% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 201,962 | $3M | 0.3% | 2026-Q2 |
| HERALD INVESTMENT MANAGEMENT Ltd | 200,000 | $3M | 0.3% | 2026-Q2 |
| Engineers Gate Manager LP trimmed | 198,697 | $3M | 0.3% | 2026-Q2 |
| Inspire Investing, LLC added | 195,941 | $3M | 0.2% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 192,528 | $3M | 0.2% | 2026-Q2 |
| Empowered Funds, LLC new | 184,606 | $3M | 0.2% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 180,890 | $3M | 0.2% | 2026-Q2 |
| XTX Topco Ltd added | 178,573 | $2M | 0.2% | 2026-Q2 |
| LAZARD ASSET MANAGEMENT LLC added | 176,625 | $2M | 0.2% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 146,245 | $2M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 145,700 | $2M | 0.2% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 140,133 | $2M | 0.2% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 138,630 | $2M | 0.2% | 2026-Q2 |
| GLOBEFLEX CAPITAL L P added | 132,526 | $2M | 0.2% | 2026-Q2 |
| Lido Advisors, LLC added | 129,355 | $2M | 0.2% | 2026-Q2 |
| Bienville Capital Management, LLC new | 127,247 | $2M | 0.2% | 2026-Q2 |
| Brevan Howard Capital Management LP trimmed | 124,994 | $2M | 0.2% | 2026-Q2 |
| TITAN GLOBAL CAPITAL MANAGEMENT USA LLC new | 123,465 | $2M | 0.2% | 2026-Q2 |
| Lisanti Capital Growth, LLC trimmed | 115,625 | $2M | 0.1% | 2026-Q2 |
| OCCUDO QUANTITATIVE STRATEGIES LP added | 115,286 | $2M | 0.1% | 2026-Q2 |
| Tidal Investments LLC added | 115,014 | $2M | 0.1% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ added | 109,674 | $2M | 0.1% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. trimmed | 106,853 | $1M | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 103,040 | $1M | 0.1% | 2026-Q2 |
| Man Group plc added | 102,762 | $1M | 0.1% | 2026-Q2 |
| Polymer Capital Management (US) LLC added | 101,366 | $1M | 0.1% | 2026-Q2 |
| Creative Planning added | 97,558 | $1M | 0.1% | 2026-Q2 |
| BURNEY CO/ new | 93,597 | $1M | 0.1% | 2026-Q2 |
| Integrated Quantitative Investments LLC added | 92,997 | $1M | 0.1% | 2026-Q2 |
| DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main new | 90,000 | $1M | 0.1% | 2026-Q2 |
| SIMPLEX TRADING, LLC trimmed | 85,325 | $1M | 0.1% | 2026-Q2 |
| Koesten, Hirschmann & Crabtree, INC. | 84,854 | $1M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 83,036 | $1M | 0.1% | 2026-Q2 |
| Skandinaviska Enskilda Banken AB (publ) trimmed | 80,190 | $1M | 0.1% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC trimmed | 78,750 | $1M | 0.1% | 2026-Q2 |
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.