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 | |
|---|---|---|---|---|---|---|
6101
CALL
Aterian
ATER
$4.07M
| $35K | ﹤0.01% |
16,700
-9,400
| -36% | -$20.9K |
|
|
AVDX
6102
CALL
DELISTED
AvidXchange
AVDX
| $35K | ﹤0.01% |
4,200
-49,800
| -92% | -$460K |
|
6103
CareDx
CDNA
$1.83B
| $35K | ﹤0.01% |
+2,008
| New | +$43.2K |
|
6104
PUT
Invesco DB Base Metals Fund
DBB
$306M
| $35K | ﹤0.01% |
1,900
-1,900
| -50% | -$36.6K |
|
6105
Evolent Health
EVH
$371M
| $35K | ﹤0.01% |
3,776
-69,904
| -95% | -$706K |
|
6106
CALL
Future Fuel
FF
$205M
| $35K | ﹤0.01% |
9,200
+5,800
| +171% | +$27.9K |
|
6107
PUT
Franklin Wireless
FKWL
$27.2M
| $35K | ﹤0.01% |
+6,200
| New | +$35.2K |
|
6108
PUT
Cedar Fair
FUN
$1.88B
| $35K | ﹤0.01% |
1,000
-200
| -17% | -$8.51K |
|
|
NB
6109
CALL
NioCorp Developments
NB
$562M
| $35K | ﹤0.01% |
+18,200
| New | +$36.6K |
|
6110
PUT
PetMed Express
PETS
$42.3M
| $35K | ﹤0.01% |
8,500
-49,200
| -85% | -$223K |
|
6111
PUT
PTC Therapeutics
PTCT
$6.18B
| $35K | ﹤0.01% |
700
-30,400
| -98% | -$1.52M |
|
|
BCIC
6112
CALL
BCP Investment Corp
BCIC
$88.3M
| $35K | ﹤0.01% |
2,500
-200
| -7% | -$3.3K |
|
|
PVL
6113
Permianville Royalty Trust
PVL
$55.8M
| $35K | ﹤0.01% |
22,470
+19,807
| +744% | +$29.4K |
|
6114
PUT
Regenxbio
RGNX
$616M
| $35K | ﹤0.01% |
5,000
+2,600
| +108% | +$19.3K |
|
6115
CALL
Construction Partners
ROAD
$5.88B
| $35K | ﹤0.01% |
500
+200
| +67% | +$15.8K |
|
6116
Ryanair
RYAAY
$30B
| $35K | ﹤0.01% |
842
-5,656
| -87% | -$258K |
|
|
TIXT
6117
CALL
DELISTED
TELUS International
TIXT
| $35K | ﹤0.01% |
13,300
+12,000
| +923% | +$40.1K |
|
6118
Vanguard S&P Small-Cap 600 ETF
VIOO
$4.12B
| $35K | ﹤0.01% |
+366
| New | +$38K |
|
6119
CALL
Amphastar Pharmaceuticals
AMPH
$907M
| $34K | ﹤0.01% |
1,200
+400
| +50% | +$12.8K |
|
6120
AXT Inc
AXTI
$2.42B
| $34K | ﹤0.01% |
24,502
+11,229
| +85% | +$21.4K |
|
6121
BellRing Brands
BRBR
$1.55B
| $34K | ﹤0.01% |
467
-493
| -51% | -$36.2K |
|
|
BRY
6122
CALL
DELISTED
Berry Corp
BRY
| $34K | ﹤0.01% |
+10,700
| New | +$43.9K |
|
|
DDL
6123
Dingdong
DDL
$525M
| $34K | ﹤0.01% |
12,732
-75,469
| -86% | -$246K |
|
6124
PUT
ESAB
ESAB
$5.37B
| $34K | ﹤0.01% |
300
-900
| -75% | -$110K |
|
6125
First Financial Bankshares
FFIN
$5.05B
| $34K | ﹤0.01% |
959
-487
| -34% | -$17.9K |
|
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.