Vault-13

RAPID MICRO BIOSYSTEMS INC RPID

CLASS A COM · Common Stock · CUSIP 75340L104

42 institutional holders +13 vs Q3 2025
14,620,29014.6m shares reported held*
$42.5mreported value*
14 new 11 added 8 reduced 2 sold out net sold ≈ $571.8k (-233.8k shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Implied quarter-end price ≈ $2.91.

Trends to Q4 2025

Institutional holders

Managers reporting a position, each quarter

0204060Q3 22: 54Q4 22: 43Q1 23: 32Q2 23: 25Q3 23: 24Q4 23: 27Q1 24: 24Q2 24: 22Q3 24: 20Q4 24: 20Q1 25: 29Q2 25: 30Q3 25: 29Q4 25: 4242Q3 22Q2 23Q1 24Q4 24Q4 25
Numbers
QuarterHolders
Q3 202254
Q4 202243
Q1 202332
Q2 202325
Q3 202324
Q4 202327
Q1 202424
Q2 202422
Q3 202420
Q4 202420
Q1 202529
Q2 202530
Q3 202529
Q4 202542

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
40040Q1 24: 7 bought or addedQ1 24: 11 cut or sold outQ2 24: 6 bought or addedQ2 24: 10 cut or sold outQ2 24Q3 24: 4 bought or addedQ3 24: 10 cut or sold outQ4 24: 8 bought or addedQ4 24: 4 cut or sold outQ4 24Q1 25: 21 bought or addedQ1 25: 8 cut or sold outQ2 25: 14 bought or addedQ2 25: 10 cut or sold outQ2 25Q3 25: 13 bought or addedQ3 25: 11 cut or sold outQ4 25: 25 bought or addedQ4 25: 10 cut or sold outQ4 25
Numbers
QuarterBought or addedCut or sold out
Q1 2024711
Q2 2024610
Q3 2024410
Q4 202484
Q1 2025218
Q2 20251410
Q3 20251311
Q4 20252510

Biggest buyers

CITADEL ADVISORS LLC New +126,539+126.5k
683 Capital Management, LLC New +120,773+120.8k
MILLENNIUM MANAGEMENT LLC New +116,502+116.5k
SUSQUEHANNA INTERNATIONAL GROUP, LLP Added +113,848+113.8k
SEI INVESTMENTS CO New +93,616+93.6k
Informed Momentum Co LLC New +77,182+77.2k
JANE STREET GROUP, LLC Added +67,161+67.2k
MARSHALL WACE, LLP New +62,911+62.9k
GOLDMAN SACHS GROUP INC New +55,306+55.3k
Qube Research & Technologies Ltd New +33,099+33.1k

Biggest sellers

Parkman Healthcare Partners LLC Reduced -558,978-559.0k
BlackRock, Inc. Reduced -327,205-327.2k
Schonfeld Strategic Advisors LLC Reduced -294,146-294.1k
Evernest Financial Advisors, LLC Reduced -75,234-75.2k
XTX Topco Ltd Sold out -22,165-22.2k
Hudson Bay Capital Management LP Sold out -11,461-11.5k
NORTHERN TRUST CORP Reduced -7,239-7.2k
UBS Group AG Reduced -249-249
JPMORGAN CHASE & CO Reduced -109-109
SBI Securities Co., Ltd. Reduced -2-2

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
Bain Capital Life Sciences Fund, L.P. 13G · exempt (held before listing) filed 2026-08-14 16.8% 7.7m≈ $13.2m 2026-08-14
Longitude Capital Partners II, LLC 13G · exempt (held before listing) filed 2026-05-15 8.6% 3.5m≈ $6.1m 2026-05-15
ARMISTICE CAPITAL, LLC 13G · institution new · filed 2026-08-14 7.3% new 3.3m≈ $5.8m 2026-08-14
Spignesi Robert G. Jr. 13D · may seek influence new · filed 2025-08-19
Stated purposeThe information set forth or incorporated by reference in Items 3 and 6 of this Statement is incorporated by reference into this Item 4. The Reporting Person intends to continuously review his investment in the Issuer and may in the future determine (1) to acquire additional securities of the Issuer, through open market purchases, private agreements or otherwise, (2) to dispose of all or a portion of the securities of the Issuer owned by him or (3) to take any other available course of action. Notwithstanding anything contained herein, the Reporting Person specifically reserves the right to change his intention with respect to any or all of such matters. In reaching any decision as to his course of action (as well as to the specific elements thereof), the Reporting Person currently expect… Full filing
 6.3% new 2.6m≈ $4.6m 2025-08-19
Endeavour Medtech Growth II LP 13G · passive investor filed 2026-02-13 5.7% 2.3m≈ $3.9m 2026-02-13

Insider purchases and sales in Q4 2025

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

Officers and directors buying vs selling

Number of people, by quarter (10% owners not included)

BuyingSelling
404Q1 24: 0 buyingQ1 24: 0 sellingQ2 24: 0 buyingQ2 24: 0 sellingQ2 24Q3 24: 4 buyingQ3 24: 0 sellingQ4 24: 1 buyingQ4 24: 0 sellingQ4 24Q1 25: 0 buyingQ1 25: 0 sellingQ2 25: 0 buyingQ2 25: 0 sellingQ2 25Q3 25: 0 buyingQ3 25: 1 sellingQ4 25: 0 buyingQ4 25: 0 sellingQ4 25
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q1 20240—0——
Q2 20240—0——
Q3 20244$141.8k0——
Q4 20241$41.4k0——
Q1 20250—0——
Q2 20250—0——
Q3 20250—1$196.0k—
Q4 20250—0——

None reported in Q4 2025.

Holders, Q4 2025

#ManagerLocationShares Value% of their portfolioChangeShares change
1 Bain Capital Life Sciences Investors, LLC 1.87% of their portfolio Boston, MA 8,434,5608.4m $24.5m $24.5m 1.87% Unchanged
2 ABG-WTT Global Life Science Capital Partners GP Ltd 35.62% of their portfolio CENTRAL, HONG KONG, K3 1,848,2961.8m $5.4m $5.4m 35.62% Unchanged
3 VANGUARD GROUP INC 0.00% of their portfolio Valley Forge, PA 978,781978.8k $2.8m $2.8m 0.00% Added +13.8k +13,763
4 Advent International, L.P. 0.03% of their portfolio BOSTON, MA 577,777577.8k $1.7m $1.7m 0.03% Unchanged
5 Parkman Healthcare Partners LLC 0.10% of their portfolio STAMFORD, CT 354,465354.5k $1.0m $1.0m 0.10% Reduced -559.0k -558,978
6 Schonfeld Strategic Advisors LLC 0.01% of their portfolio NEW YORK, NY 352,433352.4k $1.0m $1.0m 0.01% Reduced -294.1k -294,146
7 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 217,568217.6k $631.1k $631.1k 0.00% Added +12.9k +12,881
8 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 172,235172.2k $499.5k $499.5k 0.00% Added +113.8k +113,848
9 BlackRock, Inc. 0.00% of their portfolio New York, NY 156,666156.7k $454.3k $454.3k 0.00% Reduced -327.2k -327,205
10 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 126,539126.5k $367.0k $367.0k 0.00% New
11 Evernest Financial Advisors, LLC 0.10% of their portfolio CARMEL, IN 125,000125.0k $468.8k $468.8k 0.10% Reduced -75.2k -75,234
12 683 Capital Management, LLC 0.03% of their portfolio NEW YORK, NY 120,773120.8k $350.2k $350.2k 0.03% New
13 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 116,502116.5k $337.9k $337.9k 0.00% New
14 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 115,627115.6k $335.3k $335.3k 0.00% Added +5.4k +5,440
15 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 105,301105.3k $305.4k $305.4k 0.00% Added +67.2k +67,161
16 SEI INVESTMENTS CO 0.00% of their portfolio OAKS, PA 93,61693.6k $271.5k $271.5k 0.00% New
17 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 91,47491.5k $265.3k $265.3k 0.00% Unchanged
18 Informed Momentum Co LLC 0.02% of their portfolio SOLANA BEACH, CA 77,18277.2k $223.8k $223.8k 0.02% New
19 MARSHALL WACE, LLP 0.00% of their portfolio LONDON, X0 62,91162.9k $182.4k $182.4k 0.00% New
20 ESSEX INVESTMENT MANAGEMENT CO LLC 0.03% of their portfolio BOSTON, MA 62,32662.3k $180.7k $180.7k 0.03% Unchanged
21 DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio AUSTIN, TX 56,18256.2k $162.5k $162.5k 0.00% Added +540 +540
22 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 55,30655.3k $160.4k $160.4k 0.00% New
23 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 40,48740.5k $117.4k $117.4k 0.00% Reduced -7.2k -7,239
24 Qube Research & Technologies Ltd 0.00% of their portfolio LONDON, X0 33,09933.1k $96.0k $96.0k 0.00% New
25 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 31,38931.4k $91.0k $91.0k 0.00% Added +10.8k +10,839
26 Point72 Asset Management, L.P. 0.00% of their portfolio STAMFORD, CT 30,36730.4k $88.1k $88.1k 0.00% New
27 NANO CAP NEW MILLENNIUM GROWTH FUND L P 0.06% of their portfolio STATEN ISLAND, NY 25,00025.0k $72.5k $72.5k 0.06% First filing
28 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 24,85924.9k $72.1k $72.1k 0.00% New
29 OMERS ADMINISTRATION Corp 0.00% of their portfolio TORONTO, A6 24,40024.4k $70.8k $70.8k 0.00% New
30 FIFTH LANE CAPITAL, LP 0.06% of their portfolio Austin, TX 17,70017.7k $51.3k $51.3k 0.06% New
31 AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio KANSAS CITY, MO 16,92216.9k $49.1k $49.1k 0.00% Unchanged
32 Lighthouse Investment Partners, LLC 0.00% of their portfolio Palm Beach Gardens, FL 15,72015.7k $45.6k $45.6k 0.00% New
33 Legato Capital Management LLC 0.00% of their portfolio San Francisco, CA 14,68414.7k $42.6k $42.6k 0.00% Unchanged
34 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 14,30014.3k $41.5k $41.5k 0.00% Added +14.0k +14,000
35 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 12,92912.9k $37.5k $37.5k 0.00% Added +12.9k +12,914
36 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 11,10011.1k $32.2k $32.2k 0.00% Added +7.5k +7,474
37 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 4,8324.8k $14.0k $14.0k 0.00% Added +4.8k +4,831
38 RESOURCES MANAGEMENT CORP /CT/ /ADV 0.00% of their portfolio WEST HARTFORD, CT 500500 $1.0k $1.0k 0.00% Unchanged
39 Tower Research Capital LLC (TRC) 0.00% of their portfolio NEW YORK, NY 317317 $919 $919 0.00% New
40 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 109109 $316 $316 0.00% Reduced -109 -109
41 UBS Group AG 0.00% of their portfolio ZURICH, V8 4141 $119 $119 0.00% Reduced -249 -249
42 SBI Securities Co., Ltd. 0.00% of their portfolio TOKYO, M0 1515 $44 $44 0.00% Reduced -2 -2