RPID

Rapid Micro Biosystems Inc-A Cross-source read$1.23 2.50%
Health CareCUSIP 75340L104· EOD Sep 11, 2026

Among active 13F managers last quarter, 5 opened and 5 added, while 5 reduced; the largest holder to move was Advent International, L.P. (−4.4%). No open-market insider trades in the last 180 days.

Tracked 13F holders
40
10 in Q2 2026 filings
13F value (tracked)
$23.9M
Smart-money readBullish
Net sellingNet buying
Funds · active managers, latest 13F
10 adding · 5 trimming
Insiders · Form 4 open-market, 180d
0 buying · 0 selling
US House · STOCK Act, 180d
0 buying · 0 selling

Funds lean in and no leg opposes.

Price & smart-money activity

$1.23 2.50%5Y -93.9%
$0.58$6.41$12.25$18.08$23.9120212022202320242025202619711771991086981092635526242345455252410514121024
Hover for who · click for detailEnd-of-day closing prices52w $1.20 – $4.68

Who owns RPID?

40 tracked 13F filers · ranked by shares held

40 tracked 13F filers disclose a position in RPID as of the latest SEC 13F filings, a combined $23.9M in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.

#FundSharesPosition valueLast moveAs ofHistory
1Bain Capital Life Sciences Investors, LLC8.4M
$14.6M
Held
Q2 2026
2Vanguard Capital Management LLC982K
$1.7M
~0%
Reduced · −460 sh
Q2 2026
3Advent International, L.P.552K
$1.3M
−4.4%
Reduced · −25K sh
Q1 2026
4Evernest Financial Advisors, LLC506K
$875K
+17%
Added · +73K sh
Q2 2026
5Essex Investment Management Co LLC363K
$627K
−59%
Reduced · −521K sh
Q2 2026
6Sei Investments Co285K
$647K
+204%
Added · +191K sh
Q1 2026
7Millennium Management LLC283K
$643K
+143%
Added · +167K sh
Q1 2026
8Geode Capital Management, LLC228K
$395K
−7.7%
Reduced · −19K sh
Q2 2026
9Susquehanna International Group, LLP212K
$481K
+23%
Added · +40K sh
Q1 2026
10BlackRock, Inc.190K
$328K
+21%
Added · +33K sh
Q2 2026
11Jane Street Group, LLC133K
$302K
+26%
Added · +28K sh
Q1 2026
12Renaissance Technologies LLC127K
$287K
+9.5%
Added · +11K sh
Q1 2026
13Legato Capital Management LLC120K
$207K
−57%
Reduced · −155K sh
Q2 2026
14Vanguard Fiduciary Trust Co110K
$191K
+0.7%
Added · +772 sh
Q2 2026
15State Street Corp94K
$162K
Held
Q2 2026
16Dimensional Fund Advisors LP88K
$199K
+56%
Added · +31K sh
Q1 2026
17Goldman Sachs Group Inc72K
$163K
+30%
Added · +17K sh
Q1 2026
18XTX Topco Ltd61K
$139K
New
+61K sh
Q1 2026
19Northern Trust Corp48K
$110K
+19%
Added · +8K sh
Q1 2026
20Algert Global LLC38K
$66K
+65%
Added · +15K sh
Q2 2026
21Bank Of America Corp31K
$70K
+140%
Added · +18K sh
Q1 2026
22Morgan Stanley29K
$66K
−7.0%
Reduced · −2K sh
Q1 2026
23Barclays PLC22K
$49K
−13%
Reduced · −3K sh
Q1 2026
24Graham Capital Management, L.P.20K
$45K
New
+20K sh
Q1 2026
25American Century Companies Inc17K
$38K
Held
Q1 2026

Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.

Is RPID being bought or sold by institutions?

Last quarter, 5 funds opened a new position in RPID and 5 added to an existing one, while 5 reduced. Based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).

Opened
5
funds took a first position
Added
5
added to an existing position
Reduced
5
reduced, still holding
Biggest moves · ranked by size of the change, positions above a floor

Funds that own RPID also own

CompanyCo-held byTheir position there
Apple IncAAPL16 funds$17.7B
Alphabet Inc-CL AGOOGL16 funds$10.0B
Alphabet Inc-CL CGOOG16 funds$7.4B
Micron Technology IncMU16 funds$4.1B
Costco Wholesale CorpCOST16 funds$3.2B
Advanced Micro DevicesAMD16 funds$2.7B
Visa Inc-Class A SharesV16 funds$2.3B
General ElectricGE16 funds$1.6B
Bristol-Myers Squibb CoBMY16 funds$1.2B
Nvidia CorpNVDA15 funds$23.4B
Microsoft CorpMSFT15 funds$13.8B
Amazon.com IncAMZN15 funds$13.5B

Ranked by how many of RPID's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in RPID.

Insider activity (Form 4)

Full insider page →
Net · 180d
$0
0 open-market transactions
DateInsiderRoleActionSharesValue
Mar 11, 2026Wirtjes Sean MCHIEF FINANCIAL OFFICERSell (S)7K$32K
Mar 11, 2026Wilson John J. AddingtonCHIEF OPERATING OFFICERSell (S)10K$41K
Mar 10, 2026Spignesi Robert G. Jr.PRESIDENT AND CEO, DirectorSell (S)18K$74K
Feb 20, 2026Wirtjes Sean MCHIEF FINANCIAL OFFICERSell (S)17K$68K
Feb 20, 2026Wilson John J. AddingtonCHIEF OPERATING OFFICERSell (S)5K$21K
Feb 19, 2026Spignesi Robert G. Jr.PRESIDENT AND CEO, DirectorSell (S)38K$149K
Feb 9, 2026Wirtjes Sean MCHIEF FINANCIAL OFFICERSell (S)6K$23K
Feb 9, 2026Wilson John J. AddingtonCHIEF OPERATING OFFICERSell (S)5K$17K
Feb 9, 2026Spignesi Robert G. Jr.PRESIDENT AND CEO, DirectorSell (S)13K$49K
Feb 4, 2026Longitude Venture Partners II, L.P.10% OwnerSell (S)49K$190K
Feb 3, 2026Longitude Prime Partners, LLC10% OwnerSell (S)28K$117K
Feb 2, 2026Longitude Prime Partners, LLC10% OwnerSell (S)28K$117K

Do institutions, insiders and Congress agree?

Mixed signals

Where institutional funds (13F), corporate insiders (Form 4) and US House members (STOCK Act) are buying or selling the same name in the same window. Green is buying, red is selling.

SEC EDGAR 13F + Form 4 + US House STOCK Act{ }get_ticker_confluence · API & MCP

Signals by source

Insiders and Congress: last 180 days. Funds: latest 13F, top 100 holders incl. passive

SourceBuyingSellingNet
13F funds
Top 100 holders by value, passive included; the hero counts active managers only
1511
Insiders
Form 4 open-market
00$0
US House
STOCK Act trades
00$0
Sector rotation
RPID is in Health Care, which smart money is rotating OUT OF
$5.0B

Capital Rotation reports where institutional capital disclosed rotating, as of the latest public SEC 13F filings. It is data, not investment advice, a recommendation, or a prediction. Filings lag about 45 days and cover long US equity positions only. Past disclosed flows do not indicate future prices. Do your own research; consult a licensed advisor.

Institutional ownership over time

10 tracked filers in Q2 2026 filingsstill filing
02142Q3 2024Q1 2025Q3 2025Q1 2026Q2 2026
tracked filers holding their reported valueQ2 2026 filings so far: $16.9M
Each bar counts tracked filers with a position in that quarter's filings, so the newest bar excludes filers still on an earlier quarter. Arkolith's tracked universe has grown over this window; part of any long-run rise is coverage, not new buyers.

Recent filings

0 most recent

No filings captured for this ticker in the live stream yet.

Keep exploring

Connected entities for RPID

Browse more

Build

Ask your agent what changed in RPID

This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.

Copy-paste
curl -H "Authorization: Bearer YOUR_API_KEY" \
  "https://arkolith.com/api/v1/stocks/RPID/capital-change-brief"
Ask your agent
Use Arkolith's capital_change_brief for RPID.
Tell me what changed, whether insider activity
corroborates it, and cite the SEC evidence.

13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for RPID. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.