Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in RGEN held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 6.0M | $706.1M | -9.5% | 10.626% | 0.01% |
| 2 | FMR LLC | 2.9M | $340.1M | +0.7% | 5.119% | 0.02% |
| 3 | UNITED CAPITAL FINANCIAL ADVISERS, LLC | 2.8M | $326.8M | +0.1% | 4.918% | 2.01% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 2.4M | $282.4M | — | 4.249% | 0.01% |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2.3M | $271.6M | — | 4.087% | 0.01% |
| 6 | STATE STREET CORP | 1.8M | $209.4M | +3.4% | 3.151% | 0.01% |
| 7 | Bank of New York Mellon Corp | 1.5M | $180.4M | +13.9% | 2.715% | 0.03% |
| 8 | MAVERICK CAPITAL LTD | 1.5M | $178.9M | — | 2.693% | 2.06% |
| 9 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 1.4M | $164.7M | +15.0% | 2.478% | 0.06% |
| 10 | Invesco Ltd. | 1.3M | $150.6M | +1.7% | 2.266% | 0.02% |
| 11 | WASATCH ADVISORS INC | 1.2M | $146.5M | — | 2.205% | 0.97% |
| 12 | RTW INVESTMENTS, LP | 1.2M | $142.1M | +13.4% | 2.138% | 1.41% |
| 13 | FRANKLIN RESOURCES INC | 1.2M | $140.6M | +8.3% | 2.115% | 0.03% |
| 14 | CITADEL ADVISORS LLC | 1.2M | $136.8M | -19.0% | 2.059% | 0.06% |
| 15 | ALLIANCEBERNSTEIN L.P. | 832K | $136.3M | -16.4% | 1.475% | 0.04% |
| 16 | Conestoga Capital Advisors, LLC | 1.1M | $129.3M | +3.8% | 1.946% | 2.58% |
| 17 | GEODE CAPITAL MANAGEMENT, LLC | 1.1M | $125.4M | +3.4% | 1.887% | 0.01% |
| 18 | AMERIPRISE FINANCIAL INC | 925K | $109.0M | +87.2% | 1.640% | 0.03% |
| 19 | Vestal Point Capital, LP | 925K | $109.0M | +1014.5% | 1.640% | 3.05% |
| 20 | DIMENSIONAL FUND ADVISORS LP | 855K | $100.7M | +6.3% | 1.516% | 0.02% |
| 21 | CONGRESS ASSET MANAGEMENT CO /MA | 798K | $94.0M | +6.9% | 1.415% | 0.67% |
| 22 | Stephens Investment Management Group LLC | 756K | $89.0M | +15.0% | 1.340% | 1.22% |
| 23 | Holocene Advisors, LP | 709K | $83.5M | -26.2% | 1.257% | 0.20% |
| 24 | Champlain Investment Partners, LLC | 694K | $81.7M | -30.9% | 1.230% | 1.04% |
| 25 | GENEVA CAPITAL MANAGEMENT LLC | 694K | $81.7M | +23.2% | 1.230% | 1.74% |
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 RGEN — a direct measure of their conviction.
Filings activity in RGEN during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 430 | 7.3% | 93.10% | 30.15 pp | $6.86B | 24% |
| Q4 2025 | 464 | +7.2% | 123.25% | +27.33 pp | $9.08B | +28% |
| Q3 2025 | 433 | 1.1% | 95.92% | +15.63 pp | $7.07B | +19% |
| Q2 2025 | 438 | +0.5% | 80.29% | 3.37 pp | $5.91B | 4.0% |
| Q1 2025 | 436 | +3.3% | 83.66% | 5.17 pp | $6.16B | 5.8% |
| Q4 2024 | 422 | 2.3% | 88.83% | 4.12 pp | $6.54B | 4.4% |
| Q3 2024 | 432 | 2.9% | 92.95% | +11.31 pp | $6.85B | +14% |
| Q2 2024 | 445 | — | 81.64% | — | $6.01B | — |
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 RGEN stock.
Based on Q1 2026 13F filings, institutional ownership of Repligen Corporation stands at 93.1%, held across 430 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of RGEN, with approximately 5,993,054 shares worth $0.71B as of Q1 2026.
Yes — 1 widely-followed marquee investor appear among the top 25 institutional holders of RGEN, including CITADEL ADVISORS LLC.
Our composite Smart Money Score for RGEN is 28 out of 100 (Bearish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
71 institutions opened new positions in RGEN during Q1 2026, while 105 fully exited. 52 added to existing positions and 304 trimmed.
RGEN institutional ownership fell by 30.15 percentage points quarter-over-quarter, with a net change of -34 holders.
The top 10 institutions account for 41.0% of all reported 13F value in RGEN, and the top 25 account for 65.9%.
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.
Repligen Corporation (RGEN) Institutional Ownership