New Positions
15 managers initiated
Top five by reported value
- CITADEL ADVISORS LLC$367.0K
- 683 Capital Management, LLC$350.2K
- MILLENNIUM MANAGEMENT LLC$337.9K
- SEI INVESTMENTS CO$271.5K
- EAM Investors, LLC$223.8K
Rapid Micro Biosystems Inc NASDAQ NMS - GLOBAL MARKET:RPID
Institutional holders, quarter-over-quarter share deltas, and new and closed positions disclosed in Form 13F. Period 2025-12-31 · prior 2025-09-30.
15 new11 added16 reduced1 exited
Total Institutional Holders
42
as of 2025-12-31
Top Holder
Bain Capital Life Sciences Investors, LLC
$24.5M
Largest QoQ Increase
CITADEL ADVISORS LLC
+126,539 sh
Largest QoQ Decrease
Parkman Healthcare Partners LLC
-558,978 sh
New Positions(15)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| CITADEL ADVISORS LLC | 126,539 | +126,539 | $367.0K | +$367.0K | — |
| 683 Capital Management, LLC | 120,773 | +120,773 | $350.2K | +$350.2K | — |
| MILLENNIUM MANAGEMENT LLC | 116,502 | +116,502 | $337.9K | +$337.9K | — |
| SEI INVESTMENTS CO | 93,616 | +93,616 | $271.5K | +$271.5K | — |
| EAM Investors, LLC | 77,182 | +77,182 | $223.8K | +$223.8K | — |
| MARSHALL WACE, LLP | 62,911 | +62,911 | $182.4K | +$182.4K | — |
| GOLDMAN SACHS GROUP INC | 55,306 | +55,306 | $160.4K | +$160.4K | — |
| Qube Research & Technologies Ltd | 33,099 | +33,099 | $96.0K | +$96.0K | — |
| Point72 Asset Management, L.P. | 30,367 | +30,367 | $88.1K | +$88.1K | — |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P | 25,000 | +25,000 | $72.5K | +$72.5K | — |
| BARCLAYS PLC | 24,859 | +24,859 | $72.1K | +$72.1K | — |
| OMERS ADMINISTRATION Corp | 24,400 | +24,400 | $70.8K | +$70.8K | — |
| FIFTH LANE CAPITAL, LP | 17,700 | +17,700 | $51.3K | +$51.3K | — |
| Lighthouse Investment Partners, LLC | 15,720 | +15,720 | $45.6K | +$45.6K | — |
| Tower Research Capital LLC (TRC) | 317 | +317 | $919 | +$919 | — |
Added To(11)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| VANGUARD GROUP INC | 978,781 | +13,763 | $2.8M | -$384.7K | 1.4% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 172,235 | +113,848 | $499.5K | +$304.5K | 195.0% |
| JANE STREET GROUP, LLC | 105,301 | +67,161 | $305.4K | +$178.0K | 176.1% |
| GEODE CAPITAL MANAGEMENT, LLC | 217,568 | +12,881 | $631.1K | -$52.7K | 6.3% |
| ADVISOR GROUP HOLDINGS, INC. | 14,300 | +14,000 | $41.5K | +$40.5K | 4666.7% |
| BANK OF AMERICA CORP /DE/ | 12,929 | +12,914 | $37.5K | +$37.4K | 86093.3% |
| RENAISSANCE TECHNOLOGIES LLC | 115,627 | +5,440 | $335.3K | -$32.7K | 4.9% |
| DIMENSIONAL FUND ADVISORS LP | 56,182 | +540 | $162.5K | -$23.2K | 1.0% |
| MORGAN STANLEY | 31,389 | +10,839 | $91.0K | +$22.4K | 52.7% |
| BNP PARIBAS ARBITRAGE, SNC | 11,100 | +7,474 | $32.2K | +$20.1K | 206.1% |
| CITIGROUP INC | 4,832 | +4,831 | $14.0K | +$14.0K | 483100.0% |
Reduced(16)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| Bain Capital Life Sciences Investors, LLC | 8,434,560 | 0 | $24.5M | -$3.7M | 0.0% |
| Parkman Healthcare Partners LLC | 354,465 | -558,978 | $1.0M | -$2.0M | -61.2% |
| BlackRock, Inc. | 156,666 | -327,205 | $454.3K | -$1.2M | -67.6% |
| Schonfeld Strategic Advisors LLC | 352,433 | -294,146 | $1.0M | -$1.1M | -45.5% |
| ABG-WTT Global Life Science Capital Partners GP Ltd | 1,848,296 | 0 | $5.4M | -$813.3K | 0.0% |
| ADVENT INTERNATIONAL CORP/MA | 577,777 | 0 | $1.7M | -$254.2K | 0.0% |
| Evernest Financial Advisors, LLC | 125,000 | -75,234 | $468.8K | -$200.0K | -37.6% |
| NORTHERN TRUST CORP | 40,487 | -7,239 | $117.4K | -$42.0K | -15.2% |
| STATE STREET CORP | 91,474 | 0 | $265.3K | -$40.2K | 0.0% |
| ESSEX INVESTMENT MANAGEMENT CO LLC | 62,326 | 0 | $180.7K | -$27.4K | 0.0% |
| AMERICAN CENTURY COMPANIES INC | 16,922 | 0 | $49.1K | -$7.4K | 0.0% |
| UBS Group AG | 41 | -249 | $119 | -$850 | -85.9% |
| JPMORGAN CHASE & CO | 109 | 0 | $316 | -$48 | 0.0% |
| RESOURCES MANAGEMENT CORP /CT/ /ADV | 500 | -350 | $1 | -$28 | -41.2% |
| SBI Securities Co., Ltd. | 15 | -2 | $44 | -$13 | -11.8% |
| Hudson Bay Capital Management LP | 11,461 | 0 | $38.3K | $0 | 0.0% |
Sold Out(1)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| XTX Topco Ltd | 0 | -22,165 | $0 | -$74.0K | — |
Top Holders by reported value
Ranked by the dollar value reported on the latest Form 13F. Share counts reflect long positions as of 2025-12-31.
New & Closed Positions this quarter
Closed Positions
1 managers exited
Top five by prior-quarter value
- XTX Topco Ltd$74.0K
Methodology
Form 13F is the SEC's quarterly disclosure for institutional investment managers exercising discretion over $100 million or more in qualifying U.S. equity securities. Managers must file within 45 days of each calendar quarter end, which is why holdings shown here reflect a snapshot at the period date — not real-time positioning.
Quarter-over-quarter deltas compare each manager's most recently reported share count for RPID against its prior-quarter count. New positions are entries where the prior count was zero; closed positions are entries where the current count is zero. Amendments (13F-HR/A) replace prior filings for the same period.
Source: SEC EDGAR Form 13F (XML information tables). Dollar values are as reported by the manager and may use mid-quarter pricing conventions. CUSIP-to-ticker resolution is best-effort.