Vault-13

RAPID MICRO BIOSYSTEMS INC RPID

CLASS A COM · Common Stock · CUSIP 75340L104

29 institutional holders +9 vs Q4 2024
15,315,09415.3m shares reported held*
$40.4mreported value*
13 new 8 added 4 reduced 4 sold out net bought ≈ $8.9m (+3.4m 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 ≈ $2.64.

Trends to Q1 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: 2929Q3 22Q1 23Q3 23Q1 24Q3 24Q1 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

Buyers vs sellers

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

Bought or addedCut or sold out
40040Q2 23: 6 bought or addedQ2 23: 15 cut or sold outQ3 23: 5 bought or addedQ3 23: 10 cut or sold outQ3 23Q4 23: 12 bought or addedQ4 23: 6 cut or sold outQ1 24: 7 bought or addedQ1 24: 11 cut or sold outQ1 24Q2 24: 6 bought or addedQ2 24: 10 cut or sold outQ3 24: 4 bought or addedQ3 24: 10 cut or sold outQ3 24Q4 24: 8 bought or addedQ4 24: 4 cut or sold outQ1 25: 21 bought or addedQ1 25: 8 cut or sold outQ1 25
Numbers
QuarterBought or addedCut or sold out
Q2 2023615
Q3 2023510
Q4 2023126
Q1 2024711
Q2 2024610
Q3 2024410
Q4 202484
Q1 2025218

Biggest buyers

Schonfeld Strategic Advisors LLC New +1,028,805+1.0m
ABG-WTT Global Life Science Capital Partners GP Ltd Added +810,000+810.0k
Parkman Healthcare Partners LLC New +735,621+735.6k
Informed Momentum Co LLC New +176,949+176.9k
VANGUARD GROUP INC Added +169,145+169.1k
SUSQUEHANNA INTERNATIONAL GROUP, LLP New +158,542+158.5k
Evernest Financial Advisors, LLC New +131,265+131.3k
OMERS ADMINISTRATION Corp New +109,400+109.4k
BlackRock, Inc. Added +69,222+69.2k
ESSEX INVESTMENT MANAGEMENT CO LLC New +63,057+63.1k

Biggest sellers

RENAISSANCE TECHNOLOGIES LLC Reduced -72,500-72.5k
CITADEL ADVISORS LLC Sold out -72,024-72.0k
MILLENNIUM MANAGEMENT LLC Sold out -61,375-61.4k
XTX Topco Ltd Sold out -18,201-18.2k
Virtu Financial LLC Sold out -12,594-12.6k
Mariner, LLC Reduced -10,965-11.0k
Tower Research Capital LLC (TRC) Reduced -8,770-8.8k
JPMORGAN CHASE & CO Reduced -48-48

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 Q1 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
404Q2 23: 1 buyingQ2 23: 0 sellingQ3 23: 2 buyingQ3 23: 0 sellingQ3 23Q4 23: 0 buyingQ4 23: 0 sellingQ1 24: 0 buyingQ1 24: 0 sellingQ1 24Q2 24: 0 buyingQ2 24: 0 sellingQ3 24: 4 buyingQ3 24: 0 sellingQ3 24Q4 24: 1 buyingQ4 24: 0 sellingQ1 25: 0 buyingQ1 25: 0 sellingQ1 25
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q2 20231$18.2k0——
Q3 20232$60.6k0——
Q4 20230—0——
Q1 20240—0——
Q2 20240—0——
Q3 20244$141.8k0——
Q4 20241$41.4k0——
Q1 20250—0——

None reported in Q1 2025.

Holders, Q1 2025

#ManagerLocationShares Value% of their portfolioChangeShares change
1 Bain Capital Life Sciences Investors, LLC 3.29% of their portfolio Boston, MA 8,434,5608.4m $22.3m $22.3m 3.29% Unchanged
2 ABG-WTT Global Life Science Capital Partners GP Ltd 12.73% of their portfolio CENTRAL, HONG KONG, K3 1,848,2961.8m $4.9m $4.9m 12.73% Added +810.0k +810,000
3 Schonfeld Strategic Advisors LLC 0.02% of their portfolio NEW YORK, NY 1,028,8051.0m $2.7m $2.7m 0.02% New
4 VANGUARD GROUP INC 0.00% of their portfolio Valley Forge, PA 890,278890.3k $2.4m $2.4m 0.00% Added +169.1k +169,145
5 Parkman Healthcare Partners LLC 0.23% of their portfolio STAMFORD, CT 735,621735.6k $1.9m $1.9m 0.23% New
6 BlackRock, Inc. 0.00% of their portfolio New York, NY 642,101642.1k $1.7m $1.7m 0.00% Added +69.2k +69,222
7 Advent International, L.P. 0.05% of their portfolio BOSTON, MA 577,777577.8k $1.5m $1.5m 0.05% Unchanged
8 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 200,936200.9k $530.7k $530.7k 0.00% Added +47.8k +47,824
9 Informed Momentum Co LLC 0.08% of their portfolio SOLANA BEACH, CA 176,949176.9k $467.1k $467.1k 0.08% New
10 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 158,542158.5k $418.6k $418.6k 0.00% New
11 Evernest Financial Advisors, LLC 0.12% of their portfolio CARMEL, IN 131,265131.3k $346.5k $346.5k 0.12% New
12 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 110,587110.6k $291.9k $291.9k 0.00% Reduced -72.5k -72,500
13 OMERS ADMINISTRATION Corp 0.00% of their portfolio TORONTO, A6 109,400109.4k $288.8k $288.8k 0.00% New
14 ESSEX INVESTMENT MANAGEMENT CO LLC 0.03% of their portfolio BOSTON, MA 63,05763.1k $166.5k $166.5k 0.03% New
15 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 59,87459.9k $158.1k $158.1k 0.00% Added +33.8k +33,800
16 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 45,64445.6k $120.5k $120.5k 0.00% Added +30.1k +30,094
17 Mariner, LLC 0.00% of their portfolio Overland Park, KS 31,93131.9k $84.3k $84.3k 0.00% Reduced -11.0k -10,965
18 DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio AUSTIN, TX 21,16721.2k $55.9k $55.9k 0.00% New
19 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 19,56519.6k $51.7k $51.7k 0.00% Added +9.5k +9,457
20 Legato Capital Management LLC 0.01% of their portfolio San Francisco, CA 15,41515.4k $40.7k $40.7k 0.01% New
21 AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio KANSAS CITY, MO 11,58111.6k $30.6k $30.6k 0.00% New
22 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 600600 $1.6k $1.6k 0.00% New
23 RESOURCES MANAGEMENT CORP /CT/ /ADV 0.00% of their portfolio WEST HARTFORD, CT 500500 $1.0k $1.0k 0.00% Unchanged
24 Tower Research Capital LLC (TRC) 0.00% of their portfolio NEW YORK, NY 350350 $924 $924 0.00% Reduced -8.8k -8,770
25 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 148148 $391 $391 0.00% Added +7 +7
26 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 109109 $288 $288 0.00% Reduced -48 -48
27 UBS Group AG 0.00% of their portfolio ZURICH, V8 2121 $55 $55 0.00% New
28 SBI Securities Co., Ltd. 0.00% of their portfolio TOKYO, M0 1515 $40 $40 0.00% New
29 CONCOURSE FINANCIAL GROUP SECURITIES, INC. — of their portfolio BIRMINGHAM, AL 00 $0 $0 — Unchanged