Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in HYFM held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | RENAISSANCE TECHNOLOGIES LLC | 70K | $60K | -2.5% | 1.477% | 0.00% |
| 2 | BlackRock, Inc. | 50K | $43K | 0.0% | 1.059% | 0.00% |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | 40K | $34K | 0.0% | 0.833% | 0.00% |
| 4 | GEODE CAPITAL MANAGEMENT, LLC | 34K | $29K | -46.2% | 0.706% | 0.00% |
| 5 | CITADEL ADVISORS LLC | 24K | $20K | — | 0.503% | 0.00% |
| 6 | VANGUARD FIDUCIARY TRUST CO | 18K | $15K | 0.0% | 0.380% | 0.00% |
| 7 | STATE STREET CORP | 16K | $14K | 0.0% | 0.336% | 0.00% |
| 8 | Compass Ion Advisors, LLC | 11K | $9K | — | 0.226% | 0.00% |
| 9 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 11K | $9K | — | 0.223% | 0.00% |
| 10 | Tower Research Capital LLC (TRC) | 5K | $5K | +86.8% | 0.114% | 0.00% |
| 11 | UBS Group AG | 4K | $4K | +350.2% | 0.091% | 0.00% |
| 12 | JNBA Financial Advisors | 2K | $2K | 0.0% | 0.042% | 0.00% |
| 13 | Vanguard Global Advisers, LLC | 1K | $1K | 0.0% | 0.027% | 0.00% |
| 14 | OSAIC HOLDINGS, INC. | 503 | $426 | +127.6% | 0.011% | 0.00% |
| 15 | North Star Investment Management Corp. | 370 | $314 | 0.0% | 0.008% | 0.00% |
| 16 | GROUP ONE TRADING LLC | 338 | $287 | 0.0% | 0.007% | 0.00% |
| 17 | BNP PARIBAS FINANCIAL MARKETS | 198 | $168 | -13.2% | 0.004% | 0.00% |
| 18 | Hurley Capital, LLC | 103 | $88 | 0.0% | 0.002% | 0.00% |
| 19 | MORGAN STANLEY | 90 | $77 | 0.0% | 0.002% | 0.00% |
| 20 | JONES FINANCIAL COMPANIES LLLP | 75 | $59 | 0.0% | 0.002% | 0.00% |
| 21 | Virtu Financial LLC | 15K | $12 | — | 0.308% | 0.00% |
| 22 | ROYAL BANK OF CANADA | 8 | $0 | 0.0% | 0.000% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in HYFM — a direct measure of their conviction.
Filings activity in HYFM during Q2 2026, grouped by how each filer changed its position.
6 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 22 | +10% | 6.36% | +0.50 pp | $0M | 14% |
| Q1 2026 | 20 | +0.0% | 5.86% | 1.54 pp | $0M | 45% |
| Q4 2025 | 20 | 20% | 7.40% | 5.66 pp | $1M | 74% |
| Q3 2025 | 25 | +4.2% | 13.06% | +0.24 pp | $2M | 10% |
| Q2 2025 | 24 | 7.7% | 12.82% | +0.56 pp | $2M | +109% |
| Q1 2025 | 26 | — | 12.26% | — | $1M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying HYFM stock.
Based on Q2 2026 13F filings, institutional ownership of Hydrofarm Holdings Group, Inc. stands at 6.4%, held across 22 reporting institutions.
RENAISSANCE TECHNOLOGIES LLC is the largest reported institutional holder of HYFM, with approximately 70,363 shares worth $0.00B as of Q2 2026.
Yes — 3 widely-followed marquee investors appear among the top 25 institutional holders of HYFM, including RENAISSANCE TECHNOLOGIES LLC, CITADEL ADVISORS LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP.
Our composite Smart Money Score for HYFM is 72 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
4 institutions opened new positions in HYFM during Q2 2026, while 2 fully exited. 3 added to existing positions and 14 trimmed.
HYFM institutional ownership rose by 0.50 percentage points quarter-over-quarter, with a net change of +2 holders.
The top 10 institutions account for 96.8% of all reported 13F value in HYFM, 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.
Hydrofarm Holdings Group, Inc. (HYFM) Institutional Ownership