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 | |
|---|---|---|---|---|---|---|
726
PUT
Brinker International
EAT
$8.03B
| $13M | 0.01% |
87,100
-76,200
| -47% | -$11.7M |
|
727
PUT
Caesars Entertainment
CZR
$6.1B
| $13M | 0.01% |
518,500
+213,800
| +70% | +$6.95M |
|
728
CALL
KE Holdings
BEKE
$17.8B
| $13M | 0.01% |
644,900
-371,400
| -37% | -$7.36M |
|
729
CALL
Live Nation Entertainment
LYV
$41.4B
| $12.9M | 0.01% |
99,100
-49,500
| -33% | -$6.76M |
|
730
CALL
Intercontinental Exchange
ICE
$80.6B
| $12.9M | 0.01% |
75,000
-68,200
| -48% | -$11.2M |
|
|
FLG
731
CALL
Flagstar Bank National Association
FLG
$6.2B
| $12.9M | 0.01% |
1,113,100
-348,500
| -24% | -$3.92M |
|
732
Direxion Daily Financial Bull 3x ETF
FAS
$2.37B
| $12.9M | 0.01% |
81,620
-51,979
| -39% | -$8.58M |
|
733
PUT
TJX Companies
TJX
$172B
| $12.9M | 0.01% |
105,600
-131,600
| -55% | -$16M |
|
734
PUT
PENN Entertainment
PENN
$2.8B
| $12.8M | 0.01% |
786,900
+116,000
| +17% | +$2.27M |
|
735
PUT
Allstate
ALL
$64.8B
| $12.8M | 0.01% |
61,900
+17,500
| +39% | +$3.41M |
|
736
PUT
Li Auto
LI
$12B
| $12.8M | 0.01% |
508,600
-246,100
| -33% | -$6.34M |
|
737
CALL
Avis
CAR
$5.81B
| $12.8M | 0.01% |
168,800
+95,000
| +129% | +$7.63M |
|
738
PUT
Keurig Dr Pepper
KDP
$41.1B
| $12.7M | 0.01% |
372,000
-12,800
| -3% | -$416K |
|
|
IPFF
739
PUT
DELISTED
iShares International Preferred Stock ETF
IPFF
| $12.7M | 0.01% |
236,200
-88,200
| -27% | -$4.74M |
|
|
CFLT
740
CALL
DELISTED
Confluent
CFLT
| $12.7M | 0.01% |
540,300
+63,600
| +13% | +$1.84M |
|
741
CALL
Five Below
FIVE
$11.3B
| $12.6M | 0.01% |
168,700
-28,800
| -15% | -$2.53M |
|
742
CALL
Trump Media & Technology Group
DJT
$2.56B
| $12.6M | 0.01% |
644,900
-221,700
| -26% | -$6.23M |
|
743
CALL
GE HealthCare
GEHC
$27.9B
| $12.6M | 0.01% |
156,000
+5,100
| +3% | +$438K |
|
744
CALL
HCA Healthcare
HCA
$82.5B
| $12.6M | 0.01% |
36,400
-50,700
| -58% | -$16.3M |
|
745
CALL
Knight Transportation
KNX
$12.4B
| $12.5M | 0.01% |
288,500
+228,300
| +379% | +$11.8M |
|
746
CALL
Samsara
IOT
$19.4B
| $12.5M | 0.01% |
327,200
+45,700
| +16% | +$2.13M |
|
747
CALL
Quanta Services
PWR
$96.5B
| $12.5M | 0.01% |
49,300
+11,200
| +29% | +$3.24M |
|
748
PUT
Bloom Energy
BE
$62.1B
| $12.5M | 0.01% |
637,200
-28,900
| -4% | -$690K |
|
749
PUT
Lennar Class A
LEN
$19.8B
| $12.5M | 0.01% |
236,300
-130,208
| -36% | -$16.3M |
|
750
CALL
Wayfair
W
$11.1B
| $12.5M | 0.01% |
390,400
-19,800
| -5% | -$823K |
|
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.