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 | |
|---|---|---|---|---|---|---|
3951
Corporacion America
CAAP
$4.26B
| $288K | ﹤0.01% |
15,756
-2,331
| -13% | -$44K |
|
3952
Community Health Systems
CYH
$393M
| $287K | ﹤0.01% |
106,571
+15,770
| +17% | +$49.1K |
|
|
MESO
3953
PUT
Mesoblast
MESO
$1.87B
| $287K | ﹤0.01% |
23,000
-59,900
| -72% | -$987K |
|
3954
PUT
Planet Labs
PL
$7.28B
| $287K | ﹤0.01% |
85,100
-74,400
| -47% | -$348K |
|
3955
PUT
Revolve Group
RVLV
$1.92B
| $287K | ﹤0.01% |
13,400
-11,700
| -47% | -$325K |
|
3956
CALL
Aldeyra Therapeutics
ALDX
$95.3M
| $286K | ﹤0.01% |
49,800
-105,900
| -68% | -$626K |
|
|
BRSL
3957
CALL
Brightstar Lottery PLC
BRSL
$1.92B
| $286K | ﹤0.01% |
17,600
-60,000
| -77% | -$1.04M |
|
3958
PUT
Leggett & Platt
LEG
$1.47B
| $286K | ﹤0.01% |
36,200
+27,500
| +316% | +$261K |
|
3959
PUT
QuidelOrtho
QDEL
$1.14B
| $286K | ﹤0.01% |
8,200
-3,600
| -31% | -$147K |
|
3960
ProShares Ultra Yen
YCL
$31.5M
| $285K | ﹤0.01% |
+13,046
| New | +$280K |
|
|
AISP
3961
PUT
Airship AI Holdings
AISP
$66.5M
| $284K | ﹤0.01% |
73,600
+24,700
| +51% | +$115K |
|
3962
PUT
Clearwater Paper
CLW
$282M
| $284K | ﹤0.01% |
11,200
-12,100
| -52% | -$337K |
|
|
DOG
3963
ProShares Short Dow30
DOG
$109M
| $284K | ﹤0.01% |
+10,550
| New | +$277K |
|
3964
CALL
United Bankshares
UBSI
$6.71B
| $284K | ﹤0.01% |
8,200
-2,800
| -25% | -$103K |
|
|
HTGCR
3965
CALL
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $284K | ﹤0.01% |
14,800
-58,500
| -80% | -$1.12M |
|
3966
Cemex
CX
$17.3B
| $283K | ﹤0.01% |
50,511
-21,521
| -30% | -$130K |
|
3967
CALL
Daktronics
DAKT
$953M
| $283K | ﹤0.01% |
23,300
+7,100
| +44% | +$107K |
|
3968
CALL
Kingstone Companies
KINS
$292M
| $283K | ﹤0.01% |
17,000
-74,500
| -81% | -$1.19M |
|
3969
PUT
WEC Energy
WEC
$37B
| $283K | ﹤0.01% |
2,600
-1,000
| -28% | -$102K |
|
|
SA
3970
PUT
Seabridge Gold
SA
$2.69B
| $282K | ﹤0.01% |
24,200
+13,300
| +122% | +$158K |
|
|
FFAI
3971
CALL
Faraday Future Intelligent Electric
FFAI
$11.9M
| $282K | ﹤0.01% |
1,664
-5,169
| -76% | -$1.16M |
|
3972
PUT
Flex
FLEX
$41.5B
| $281K | ﹤0.01% |
8,900
-5,800
| -39% | -$227K |
|
|
IRBT
3973
CALL
DELISTED
iRobot
IRBT
| $281K | ﹤0.01% |
104,300
-195,100
| -65% | -$1.41M |
|
3974
CALL
O-I Glass
OI
$1.39B
| $281K | ﹤0.01% |
24,500
+12,900
| +111% | +$147K |
|
|
EVRI
3975
DELISTED
Everi Holdings
EVRI
| $280K | ﹤0.01% |
20,521
-7,722
| -27% | -$105K |
|
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.