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 | |
|---|---|---|---|---|---|---|
|
EH
1801
CALL
EHang Holdings
EH
$372M
| $2.58M | ﹤0.01% |
123,400
-30,600
| -20% | -$621K |
|
1802
CALL
Public Storage
PSA
$60.2B
| $2.57M | ﹤0.01% |
8,600
+7,100
| +473% | +$2.12M |
|
1803
ACM Research
ACMR
$5.83B
| $2.57M | ﹤0.01% |
110,128
-31,308
| -22% | -$715K |
|
1804
CALL
DaVita
DVA
$15.1B
| $2.57M | ﹤0.01% |
16,800
-8,900
| -35% | -$1.4M |
|
1805
PUT
MasTec
MTZ
$26.7B
| $2.57M | ﹤0.01% |
22,000
-26,600
| -55% | -$3.59M |
|
1806
PUT
iQIYI
IQ
$1.18B
| $2.56M | ﹤0.01% |
1,135,000
+577,400
| +104% | +$1.27M |
|
1807
PUT
Goodyear
GT
$2.07B
| $2.56M | ﹤0.01% |
277,500
-107,400
| -28% | -$982K |
|
1808
PUT
FIVE9
FIVN
$1.77B
| $2.56M | ﹤0.01% |
94,400
+61,900
| +190% | +$2.27M |
|
1809
TripAdvisor
TRIP
$1.59B
| $2.56M | ﹤0.01% |
180,714
+105,199
| +139% | +$1.65M |
|
1810
CALL
CNX Resources
CNX
$4.85B
| $2.56M | ﹤0.01% |
81,300
-68,000
| -46% | -$2.05M |
|
1811
PUT
Group 1 Automotive
GPI
$3.94B
| $2.56M | ﹤0.01% |
6,700
+400
| +6% | +$175K |
|
1812
Harley-Davidson
HOG
$2.68B
| $2.55M | ﹤0.01% |
101,151
+49,864
| +97% | +$1.33M |
|
1813
PUT
Exelon
EXC
$48.6B
| $2.55M | ﹤0.01% |
55,400
-26,400
| -32% | -$1.1M |
|
|
PR
1814
CALL
Permian Resources
PR
$17.9B
| $2.55M | ﹤0.01% |
184,300
-232,700
| -56% | -$3.33M |
|
1815
PUT
Starwood Property Trust
STWD
$6.12B
| $2.55M | ﹤0.01% |
128,900
+34,000
| +36% | +$668K |
|
1816
CALL
FIGS
FIGS
$1.59B
| $2.54M | ﹤0.01% |
554,400
-242,500
| -30% | -$1.29M |
|
1817
PUT
Nexstar Media Group
NXST
$5.6B
| $2.54M | ﹤0.01% |
14,200
+13,200
| +1,320% | +$2.14M |
|
1818
Recursion Pharmaceuticals
RXRX
$1.57B
| $2.54M | ﹤0.01% |
481,048
+217,676
| +83% | +$1.59M |
|
|
RDFN
1819
CALL
DELISTED
Redfin
RDFN
| $2.54M | ﹤0.01% |
276,200
-277,600
| -50% | -$2.37M |
|
1820
CALL
Elastic
ESTC
$6.1B
| $2.54M | ﹤0.01% |
28,500
-90,300
| -76% | -$9.37M |
|
1821
Five Below
FIVE
$11.2B
| $2.54M | ﹤0.01% |
+33,882
| New | +$2.98M |
|
1822
CALL
JetBlue
JBLU
$1.96B
| $2.54M | ﹤0.01% |
526,700
-177,100
| -25% | -$1.16M |
|
1823
ProShares Bitcoin Strategy ETF
BITO
$1.4B
| $2.54M | ﹤0.01% |
+138,514
| New | +$3.01M |
|
1824
CALL
DXC Technology
DXC
$1.63B
| $2.54M | ﹤0.01% |
148,800
+145,800
| +4,860% | +$2.83M |
|
1825
CALL
Dave & Buster's
PLAY
$343M
| $2.54M | ﹤0.01% |
144,400
+16,100
| +13% | +$381K |
|
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.