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 | |
|---|---|---|---|---|---|---|
4126
PUT
ACI Worldwide
ACIW
$6.14B
| $240K | ﹤0.01% |
4,400
+1,900
| +76% | +$101K |
|
4127
PUT
Cellebrite
CLBT
$3.72B
| $240K | ﹤0.01% |
12,400
+6,900
| +125% | +$145K |
|
4128
PUT
Innoviz Technologies
INVZ
$94.3M
| $240K | ﹤0.01% |
368,600
+112,000
| +44% | +$129K |
|
4129
CALL
Karyopharm Therapeutics
KPTI
$157M
| $240K | ﹤0.01% |
64,300
+60,633
| +1,653% | +$518K |
|
4130
PUT
Arcutis Biotherapeutics
ARQT
$3.49B
| $239K | ﹤0.01% |
15,300
-12,000
| -44% | -$169K |
|
4131
CALL
Fulgent Genetics
FLGT
$558M
| $239K | ﹤0.01% |
14,200
+11,600
| +446% | +$198K |
|
4132
Hilton Grand Vacations
HGV
$4.11B
| $238K | ﹤0.01% |
6,369
+6,032
| +1,790% | +$241K |
|
4133
PUT
MaxLinear
MXL
$5.2B
| $238K | ﹤0.01% |
22,000
-1,900
| -8% | -$31.8K |
|
4134
CALL
Telus
TU
$17.1B
| $238K | ﹤0.01% |
16,600
-102,600
| -86% | -$1.5M |
|
4135
Voya Financial
VOYA
$8.98B
| $238K | ﹤0.01% |
3,518
+1,997
| +131% | +$140K |
|
4136
CALL
Cheniere Energy
CQP
$31.4B
| $237K | ﹤0.01% |
3,600
+2,400
| +200% | +$149K |
|
4137
Douglas Emmett
DEI
$2.09B
| $237K | ﹤0.01% |
14,852
-28,073
| -65% | -$476K |
|
4138
FIVE9
FIVN
$2.11B
| $237K | ﹤0.01% |
8,752
+4,692
| +116% | +$172K |
|
4139
PUT
AvalonBay Communities
AVB
$27.4B
| $236K | ﹤0.01% |
1,100
+900
| +450% | +$195K |
|
4140
PUT
Caleres
CAL
$435M
| $236K | ﹤0.01% |
13,700
+4,300
| +46% | +$77.3K |
|
4141
CALL
1-800-Flowers.com
FLWS
$258M
| $236K | ﹤0.01% |
40,100
+28,600
| +249% | +$210K |
|
|
HOUS
4142
DELISTED
Anywhere Real Estate
HOUS
| $236K | ﹤0.01% |
71,073
+15,468
| +28% | +$54.8K |
|
4143
PUT
Reinsurance Group of America
RGA
$15.7B
| $236K | ﹤0.01% |
1,200
+1,100
| +1,100% | +$228K |
|
|
SEMR
4144
CALL
DELISTED
Semrush
SEMR
| $236K | ﹤0.01% |
+25,300
| New | +$345K |
|
4145
CALL
Vanguard S&P 500 Growth ETF
VOOG
$24.9B
| $236K | ﹤0.01% |
4,800
-5,400
| -53% | -$327K |
|
4146
Ashland
ASH
$3.4B
| $235K | ﹤0.01% |
3,972
+3,444
| +652% | +$219K |
|
4147
PUT
Carlyle Group
CG
$16.3B
| $235K | ﹤0.01% |
5,400
-20,900
| -79% | -$1.04M |
|
|
VRNT
4148
PUT
DELISTED
Verint Systems
VRNT
| $235K | ﹤0.01% |
13,200
+3,300
| +33% | +$79K |
|
|
CAN
4149
CALL
Canaan Creative
CAN
$173M
| $234K | ﹤0.01% |
267,400
-476,500
| -64% | -$757K |
|
4150
Neogen
NEOG
$1.99B
| $234K | ﹤0.01% |
27,004
+11,058
| +69% | +$116K |
|
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.