Loomis Sayles & Co L P (CIK: 0000312348) is a financial institution headquartered at One Financial Center, 5Th Floor, Boston, Massachusetts 02111. The firm regularly files Form 13F with the U.S. Securities and Exchange Commission (SEC), disclosing its equity holdings and investment positions.

As of the latest reporting period (2026-03-31), the institution manages a portfolio valued at $74.33 B, comprising 718 distinct securities. Over its filing history, it has submitted 54 Form 13F reports.

To view the institution’s full SEC filing history:
🔗 View All SEC Filings

Q1 2026 — Top-10 concentration: 52.7%. Quarterly turnover: 2.8%. ▲ 71 new, +166 added, −386 reduced, ×55 exited.

Top Buys

Q1 2026

1. BKNG Booking Holdings

+$509 M

2. NVDA Nvidia Corporation

+$110.98 M

3. ORCL Oracle Corporation

+$93.99 M

4. AMZN Amazoncom

+$75.53 M

5. EXPE Expedia Group

+$72.85 M

Top Sells

Q1 2026

1. ILMN Illumina

−$151.45 M

2. PH Parker-Hannifin Corporation

−$130.45 M

3. CMI Cummins

−$90.14 M

4. MTD Mettler-Toledo International

−$77.38 M

5. HD The Home Depot

−$70.02 M

Stocks/ETFs

-10.45%

$73.81 B 99.31%

Options

$0 0.00%

Debt

-53.54%

$33.81 M 0.05%

Other

+6.02%

$479.28 M 0.64%

Name	Shares	Market Value	Weight	Change	Activity
Nvidia Corporation NVDA	40.98 M	$7.15 B	9.61%	▲ 636,374	Add 1.6%
Alphabet GOOGL	17.34 M	$4.99 B	6.71%	▲ 197,124	Add 1.2%
Tesla TSLA	12.66 M	$4.7 B	6.33%	▲ 5,361	Add 0.0%
Meta Platforms META	7.45 M	$4.26 B	5.73%	▲ 43,118	Add 0.6%
Amazoncom AMZN	18.33 M	$3.82 B	5.13%	▲ 362,660	Add 2.0%
Netflix NFLX	37.97 M	$3.65 B	4.91%	▲ 743,146	Add 2.0%
The Boeing Company BA	14.06 M	$2.8 B	3.77%	▼ 98,105	Reduce -0.7%
Visa V	9.25 M	$2.8 B	3.76%	▲ 32,010	Add 0.4%
Oracle Corporation ORCL	16.84 M	$2.48 B	3.33%	▲ 638,885	Add 3.9%
Microsoft Corporation MSFT	6.06 M	$2.24 B	3.02%	▲ 66,645	Add 1.1%

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Loomis Sayles & Co L P's Portfolio

This portfolio view aggregates one or more SEC Form 13F filings submitted by Loomis Sayles & Co L P each quarter. Holdings are organized into Stocks/ETFs, Options, Debt, and Other, with transaction markers indicating New Buy, Add, Reduce, No Change, or Sold Out. Reported anomalies are corrected where possible, and share counts are adjusted to reflect corporate actions such as stock splits. Since 2013, we have collected 52 quarters of portfolio data for this firm, providing a transparent record of institutional strategy over time.

Options Exposure History

CALL PUT

Report Date	Type	Underlying Shares	Notional Value	% Change

Report Date	Bought/Sold (Sh.)	% Change	Qtr. End Shares	Reported Price

Stocks ETFs

Name	Shares	Value	% of Portfolio	% Change
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CALL PUT

Type	Name	Shares	Value	% of Portfolio	% Change
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Name	Amount	Value	% of Portfolio	% Change
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Name	Shares	Value	% of Portfolio	% Change
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Loomis Sayles & Co L P Quarterly 13F Statistics

Discover detailed insights into Loomis Sayles & Co L P’s SEC Form 13F filings, including:

Quarterly changes in holdings
Portfolio turnover
Asset allocation trends
Top 10 stock and ETF positions

This page provides a transparent view of institutional strategies based on official SEC disclosures, helping investors track long‑term shifts since 2013.

Quarter	Holdings	Total Value	Turnover Rate	Asset Allocation	Top 10 Stock & ETF Holdings

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Loomis Sayles & Co L P's All 13F Filings

This section lists all SEC Form 13F filings submitted by Loomis Sayles & Co L P.

Form 13F must be filed within 45 days after the end of each calendar quarter and discloses the reporting manager, the securities held, their CUSIP numbers, the number of shares held at quarter-end, and the total reported market value.

Please note that the market value shown reflects reported holdings only and should not be considered a substitute for Assets Under Management (AUM), as cash positions are excluded.
Each filing entry includes a direct link to the original Form 13F document on the SEC’s EDGAR system .

Report For	Filed At	AUM	Holdings	Form Type	Source

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Insider Trading Activity (SEC Form 4)

This section tracks real-time insider transactions reported via SEC Form 4 filings. Unlike the quarterly 13F portfolio snapshots, these records reflect immediate buying and selling activity where the filer acts as a corporate insider. Use this data to spot timely market moves.

Date Top Line (Transaction Date): The date of the most recent insider transaction. Bottom Line (Filing Date): The date the transaction was filed with the SEC.	Value Total Value: The total monetary value of the transaction. (Shares × Price)	Shares Shares Traded: Number of shares bought or sold in this specific transaction. Adjusted for splits.	Position / Chg Top Line (Held): Total shares owned after the transaction. Bottom Line (Change %): The percentage change in holdings due to this trade.
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Data Source & Methodology: This table is sourced exclusively from SEC Form 4 filings and is adjusted for stock splits. It reflects active insider trading decisions and does not include passive beneficial ownership reported in 13F or 13D/G filings.

Loomis Sayles & Co L P 13F Filings, Portfolio & Analysis

Loomis Sayles & Co L P — Portfolio Overview & Company Profile

Portfolio Summary (Q1 2026)

Top Buys

Top Sells

Asset Allocation

Sector Allocation (Stocks)

Top Stock & ETF Holdings (Q1 2026)

Historical Portfolio Charts

Loomis Sayles & Co L P's Portfolio

Loomis Sayles & Co L P Quarterly 13F Statistics

Loomis Sayles & Co L P's All 13F Filings

Insider Trading Activity (SEC Form 4)