Vault-13

RAPID MICRO BIOSYSTEMS INC RPID

CLASS A COM · Common Stock · CUSIP 75340L104

24 institutional holders -1 vs Q2 2023
21,457,25521.5m shares reported held*
$23.2mreported value*
1 new 4 added 8 reduced 2 sold out net sold ≈ $449.7k (-416.4k 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 ≈ $1.08.

Trends to Q3 2023

Institutional holders

Managers reporting a position, each quarter

0204060Q3 22: 54Q4 22: 43Q1 23: 32Q2 23: 25Q3 23: 2424Q3 22Q4 22Q1 23Q2 23Q3 23
Numbers
QuarterHolders
Q3 202254
Q4 202243
Q1 202332
Q2 202325
Q3 202324

Buyers vs sellers

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

Bought or addedCut or sold out
40040Q4 22: 16 bought or addedQ4 22: 28 cut or sold outQ4 22Q1 23: 7 bought or addedQ1 23: 24 cut or sold outQ1 23Q2 23: 6 bought or addedQ2 23: 15 cut or sold outQ2 23Q3 23: 5 bought or addedQ3 23: 10 cut or sold outQ3 23
Numbers
QuarterBought or addedCut or sold out
Q4 20221628
Q1 2023724
Q2 2023615
Q3 2023510

Biggest buyers

Biggest sellers

Ally Bridge Group (NY) LLC Sold out -403,284-403.3k
CITADEL ADVISORS LLC Reduced -33,095-33.1k
MILLENNIUM MANAGEMENT LLC Reduced -18,787-18.8k
BlackRock Inc. Reduced -12,743-12.7k
RENAISSANCE TECHNOLOGIES LLC Reduced -5,379-5.4k
VANGUARD GROUP INC Reduced -3,576-3.6k
NORTHERN TRUST CORP Reduced -2,571-2.6k
JPMORGAN CHASE & CO Reduced -1,479-1.5k
Tower Research Capital LLC (TRC) Reduced -710-710
ROYAL BANK OF CANADA Sold out -339-339

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 Q3 2023

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
202Q4 21: 0 buyingQ4 21: 0 sellingQ1 22: 1 buyingQ1 22: 0 sellingQ1 22Q2 22: 1 buyingQ2 22: 0 sellingQ3 22: 0 buyingQ3 22: 0 sellingQ3 22Q4 22: 0 buyingQ4 22: 0 sellingQ1 23: 0 buyingQ1 23: 0 sellingQ1 23Q2 23: 1 buyingQ2 23: 0 sellingQ3 23: 2 buyingQ3 23: 0 sellingQ3 23
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q4 20210—0——
Q1 20221$69.5k0——
Q2 20221$38.0k0——
Q3 20220—0——
Q4 20220—0——
Q1 20230—0——
Q2 20231$18.2k0——
Q3 20232$60.6k0——
DateInsiderTradeSharesPrice ValueTheir holding
2023-09-06 WIRTJES SEAN M CHIEF FINANCIAL OFFICER Bought 10,000 $0.99 $9.9k10.0k shares +4%
2023-08-15 Spignesi Robert G. Jr. PRESIDENT AND CEO, director Bought 20,000 $0.97 $19.4k20.0k shares +6%
2023-08-08 Spignesi Robert G. Jr. PRESIDENT AND CEO, director Bought 34,000 $0.92 $31.3k34.0k shares +11%

Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).

Holders, Q3 2023

#ManagerLocationShares Value% of their portfolioChangeShares change
1 Bain Capital Life Sciences Investors, LLC 1.02% of their portfolio Boston, MA 8,434,5608.4m $9.1m $9.1m 1.02% Unchanged
2 KENNEDY LEWIS MANAGEMENT LP 25.51% of their portfolio NEW YORK, NY 4,939,9314.9m $5.3m $5.3m 25.51% Unchanged
3 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 1,434,2281.4m $1.5m $1.5m 0.00% Reduced -1.5k -1,479
4 GLENVIEW CAPITAL MANAGEMENT, LLC 0.04% of their portfolio NEW YORK, NY 1,318,2881.3m $1.4m $1.4m 0.04% Unchanged
5 ABG-WTT Global Life Science Capital Partners GP Ltd 5.38% of their portfolio CENTRAL, HONG KONG, K3 1,038,2961.0m $1.1m $1.1m 5.38% Unchanged
6 BlackRock Inc. 0.00% of their portfolio New York, NY 1,022,1181.0m $1.1m $1.1m 0.00% Reduced -12.7k -12,743
7 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 947,781947.8k $1.0m $1.0m 0.00% Added +6.4k +6,424
8 VANGUARD GROUP INC 0.00% of their portfolio Valley Forge, PA 726,024726.0k $784.1k $784.1k 0.00% Reduced -3.6k -3,576
9 ADAGE CAPITAL PARTNERS GP, L.L.C. 0.00% of their portfolio Boston, MA 700,000700.0k $756.0k $756.0k 0.00% Unchanged
10 Advent International, L.P. 0.01% of their portfolio BOSTON, MA 577,777577.8k $624.0k $624.0k 0.01% Unchanged
11 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 155,264155.3k $167.7k $167.7k 0.00% Added +58.6k +58,616
12 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 26,07426.1k $28.2k $28.2k 0.00% Unchanged
13 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 24,98525.0k $27.0k $27.0k 0.00% Reduced -18.8k -18,787
14 Parkwood LLC 0.00% of their portfolio CLEVELAND, OH 24,51124.5k $26.0k $26.0k 0.00% Unchanged
15 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 22,38722.4k $24.0k $24.0k 0.00% Reduced -5.4k -5,379
16 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 18,94418.9k $20.5k $20.5k 0.00% Reduced -2.6k -2,571
17 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 16,64116.6k $18.0k $18.0k 0.00% Reduced -33.1k -33,095
18 Schonfeld Strategic Advisors LLC 0.00% of their portfolio NEW YORK, NY 15,00015.0k $16.2k $16.2k 0.00% Unchanged
19 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 10,64410.6k $11.5k $11.5k 0.00% Added +436 +436
20 Tower Research Capital LLC (TRC) 0.00% of their portfolio NEW YORK, NY 3,1523.2k $3.4k $3.4k 0.00% Reduced -710 -710
21 RESOURCES MANAGEMENT CORP /CT/ /ADV 0.00% of their portfolio WEST HARTFORD, CT 500500 $1.0k $1.0k 0.00% Unchanged
22 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 146146 $158 $158 0.00% Added +62 +62
23 Qube Research & Technologies Ltd 0.00% of their portfolio LONDON, X0 44 $4 $4 0.00% New
24 CONCOURSE FINANCIAL GROUP SECURITIES, INC. 0.00% of their portfolio BIRMINGHAM, AL 00 $0 $0 0.00% Unchanged