Vault-13

RAPID MICRO BIOSYSTEMS INC RPID

CLASS A COM · Common Stock · CUSIP 75340L104

30 institutional holders +1 vs Q1 2025
15,145,61015.1m shares reported held*
$52.3mreported value*
3 new 11 added 8 reduced 2 sold out net sold ≈ $584.7k (-169.5k 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 ≈ $3.45.

Trends to Q2 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: 3030Q3 22Q2 23Q1 24Q4 24Q2 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

Buyers vs sellers

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

Bought or addedCut or sold out
40040Q3 23: 5 bought or addedQ3 23: 10 cut or sold outQ4 23: 12 bought or addedQ4 23: 6 cut or sold outQ4 23Q1 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 25
Numbers
QuarterBought or addedCut or sold out
Q3 2023510
Q4 2023126
Q1 2024711
Q2 2024610
Q3 2024410
Q4 202484
Q1 2025218
Q2 20251410

Biggest buyers

Parkman Healthcare Partners LLC Added +177,822+177.8k
XTX Topco Ltd New +41,800+41.8k
CITADEL ADVISORS LLC New +20,762+20.8k
DIMENSIONAL FUND ADVISORS LP Added +19,220+19.2k
MORGAN STANLEY Added +16,658+16.7k
VANGUARD GROUP INC Added +14,085+14.1k
Schonfeld Strategic Advisors LLC Added +8,863+8.9k
UBS Group AG Added +8,672+8.7k
AMERICAN CENTURY COMPANIES INC Added +5,341+5.3k
GEODE CAPITAL MANAGEMENT, LLC Added +3,143+3.1k

Biggest sellers

BlackRock, Inc. Reduced -165,284-165.3k
OMERS ADMINISTRATION Corp Sold out -109,400-109.4k
SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced -106,683-106.7k
Evernest Financial Advisors, LLC Reduced -87,265-87.3k
Mariner, LLC Reduced -11,706-11.7k
Informed Momentum Co LLC Reduced -6,844-6.8k
ESSEX INVESTMENT MANAGEMENT CO LLC Reduced -731-731
Legato Capital Management LLC Reduced -731-731
Tower Research Capital LLC (TRC) Sold out -350-350
OSAIC HOLDINGS, INC. Reduced -300-300

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 Q2 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
404Q3 23: 2 buyingQ3 23: 0 sellingQ4 23: 0 buyingQ4 23: 0 sellingQ4 23Q1 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 25
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q3 20232$60.6k0——
Q4 20230—0——
Q1 20240—0——
Q2 20240—0——
Q3 20244$141.8k0——
Q4 20241$41.4k0——
Q1 20250—0——
Q2 20250—0——

None reported in Q2 2025.

Holders, Q2 2025

#ManagerLocationShares Value% of their portfolioChangeShares change
1 Bain Capital Life Sciences Investors, LLC 3.64% of their portfolio Boston, MA 8,434,5608.4m $29.1m $29.1m 3.64% Unchanged
2 ABG-WTT Global Life Science Capital Partners GP Ltd 23.83% of their portfolio CENTRAL, HONG KONG, K3 1,848,2961.8m $6.4m $6.4m 23.83% Unchanged
3 Schonfeld Strategic Advisors LLC 0.03% of their portfolio NEW YORK, NY 1,037,6681.0m $3.6m $3.6m 0.03% Added +8.9k +8,863
4 Parkman Healthcare Partners LLC 0.36% of their portfolio STAMFORD, CT 913,443913.4k $3.2m $3.2m 0.36% Added +177.8k +177,822
5 VANGUARD GROUP INC 0.00% of their portfolio Valley Forge, PA 904,363904.4k $3.1m $3.1m 0.00% Added +14.1k +14,085
6 Advent International, L.P. 0.06% of their portfolio BOSTON, MA 577,777577.8k $2.0m $2.0m 0.06% Unchanged
7 BlackRock, Inc. 0.00% of their portfolio New York, NY 476,817476.8k $1.6m $1.6m 0.00% Reduced -165.3k -165,284
8 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 204,079204.1k $704.3k $704.3k 0.00% Added +3.1k +3,143
9 Informed Momentum Co LLC 0.09% of their portfolio SOLANA BEACH, CA 170,105170.1k $586.9k $586.9k 0.09% Reduced -6.8k -6,844
10 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 110,987111.0k $382.9k $382.9k 0.00% Added +400 +400
11 ESSEX INVESTMENT MANAGEMENT CO LLC 0.04% of their portfolio BOSTON, MA 62,32662.3k $215.0k $215.0k 0.04% Reduced -731 -731
12 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 59,87459.9k $206.6k $206.6k 0.00% Unchanged
13 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 51,85951.9k $178.9k $178.9k 0.00% Reduced -106.7k -106,683
14 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 48,55948.6k $167.5k $167.5k 0.00% Added +2.9k +2,915
15 Evernest Financial Advisors, LLC 0.05% of their portfolio CARMEL, IN 44,00044.0k $151.8k $151.8k 0.05% Reduced -87.3k -87,265
16 XTX Topco Ltd 0.01% of their portfolio LONDON, X0 41,80041.8k $144.2k $144.2k 0.01% New
17 DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio AUSTIN, TX 40,38740.4k $139.7k $139.7k 0.00% Added +19.2k +19,220
18 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 36,22336.2k $125.0k $125.0k 0.00% Added +16.7k +16,658
19 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 20,76220.8k $71.6k $71.6k 0.00% New
20 Mariner, LLC 0.00% of their portfolio Overland Park, KS 20,22520.2k $69.8k $69.8k 0.00% Reduced -11.7k -11,706
21 AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio KANSAS CITY, MO 16,92216.9k $58.4k $58.4k 0.00% Added +5.3k +5,341
22 Legato Capital Management LLC 0.01% of their portfolio San Francisco, CA 14,68414.7k $50.7k $50.7k 0.01% Reduced -731 -731
23 UBS Group AG 0.00% of their portfolio ZURICH, V8 8,6938.7k $30.0k $30.0k 0.00% Added +8.7k +8,672
24 RESOURCES MANAGEMENT CORP /CT/ /ADV 0.00% of their portfolio WEST HARTFORD, CT 500500 $2.0k $2.0k 0.00% Unchanged
25 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 300300 $1.0k $1.0k 0.00% Reduced -300 -300
26 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 177177 $611 $611 0.00% Added +29 +29
27 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 109109 $376 $376 0.00% Unchanged
28 Steward Partners Investment Advisory, LLC 0.00% of their portfolio STAMFORD, CT 100100 $345 $345 0.00% New
29 SBI Securities Co., Ltd. 0.00% of their portfolio TOKYO, M0 1515 $52 $52 0.00% Unchanged
30 CONCOURSE FINANCIAL GROUP SECURITIES, INC. — of their portfolio BIRMINGHAM, AL 00 $0 $0 — Unchanged