Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2001
CALL
Waters Corp
WAT
$36.8B
| $2.06M | ﹤0.01% |
5,600
+1,400
| +33% | +$542K |
|
2002
PUT
Transocean
RIG
$5.92B
| $2.06M | ﹤0.01% |
650,600
+121,100
| +23% | +$425K |
|
2003
PUT
Protagonist Therapeutics
PTGX
$8.75B
| $2.06M | ﹤0.01% |
42,600
+13,800
| +48% | +$578K |
|
2004
CALL
Keros Therapeutics
KROS
$199M
| $2.06M | ﹤0.01% |
202,100
+201,800
| +67,267% | +$2.34M |
|
2005
PUT
HubSpot
HUBS
$10.5B
| $2.06M | ﹤0.01% |
3,600
-34,600
| -91% | -$24.3M |
|
2006
Stanley Black & Decker
SWK
$14.2B
| $2.06M | ﹤0.01% |
26,750
+19,500
| +269% | +$1.64M |
|
|
VG
2007
CALL
Venture Global Inc
VG
$35.6B
| $2.06M | ﹤0.01% |
+199,600
| New | +$2.91M |
|
2008
PUT
Cirrus Logic
CRUS
$6.74B
| $2.05M | ﹤0.01% |
20,600
-33,300
| -62% | -$3.43M |
|
2009
PUT
Magna International
MGA
$17.9B
| $2.05M | ﹤0.01% |
60,300
+37,700
| +167% | +$1.45M |
|
|
SWTX
2010
DELISTED
SpringWorks Therapeutics
SWTX
| $2.05M | ﹤0.01% |
46,435
+38,020
| +452% | +$1.75M |
|
2011
PUT
Novavax
NVAX
$1.23B
| $2.05M | ﹤0.01% |
319,200
-839,000
| -72% | -$6.94M |
|
|
GTM
2012
ZoomInfo Technologies
GTM
$861M
| $2.05M | ﹤0.01% |
204,622
+81,124
| +66% | +$851K |
|
|
NNDM
2013
PUT
Nano Dimension
NNDM
$309M
| $2.04M | ﹤0.01% |
1,286,300
+780,100
| +154% | +$1.77M |
|
2014
CALL
Kaspi.kz JSC
KSPI
$16.3B
| $2.04M | ﹤0.01% |
22,000
+18,600
| +547% | +$1.82M |
|
2015
PUT
Elanco Animal Health
ELAN
$12.4B
| $2.03M | ﹤0.01% |
193,800
-43,400
| -18% | -$491K |
|
2016
PUT
McCormick & Company Non-Voting
MKC
$13.4B
| $2.03M | ﹤0.01% |
24,700
-5,900
| -19% | -$462K |
|
2017
CALL
Establishment Labs
ESTA
$2.72B
| $2.03M | ﹤0.01% |
49,800
+4,100
| +9% | +$153K |
|
2018
CALL
Globe Life
GL
$13.5B
| $2.03M | ﹤0.01% |
15,400
-82,900
| -84% | -$10.1M |
|
|
VNET
2019
CALL
VNET Group
VNET
$2.05B
| $2.03M | ﹤0.01% |
247,200
+221,700
| +869% | +$2.03M |
|
2020
PUT
Viasat
VSAT
$9.79B
| $2.01M | ﹤0.01% |
193,300
+31,800
| +20% | +$306K |
|
2021
CALL
Atour Lifestyle Holdings
ATAT
$4.35B
| $2.01M | ﹤0.01% |
71,000
-38,300
| -35% | -$1.09M |
|
2022
PUT
Canadian Solar
CSIQ
$906M
| $2.01M | ﹤0.01% |
232,600
-116,000
| -33% | -$1.22M |
|
2023
CALL
Antero Midstream
AM
$10.8B
| $2.01M | ﹤0.01% |
111,700
-11,800
| -10% | -$195K |
|
2024
PUT
ProShares Ether Strategy ETF
EETH
$54.2M
| $2.01M | ﹤0.01% |
69,200
-373,300
| -84% | -$18.8M |
|
2025
SharkNinja
SN
$21B
| $2M | ﹤0.01% |
24,037
+831
| +4% | +$84.6K |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.