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 | |
|---|---|---|---|---|---|---|
2051
PUT
Titan Machinery
TITN
$466M
| $1.95M | ﹤0.01% |
114,500
+113,900
| +18,983% | +$1.88M |
|
2052
Ionis Pharmaceuticals
IONS
$9.35B
| $1.95M | ﹤0.01% |
+64,581
| New | +$2.11M |
|
2053
CALL
SLM Corp
SLM
$4.57B
| $1.94M | ﹤0.01% |
66,200
+43,400
| +190% | +$1.27M |
|
2054
CALL
Ollie's Bargain Outlet
OLLI
$4.01B
| $1.94M | ﹤0.01% |
16,700
-10,800
| -39% | -$1.14M |
|
2055
PUT
Perion Network
PERI
$367M
| $1.94M | ﹤0.01% |
238,700
+181,400
| +317% | +$1.58M |
|
|
CVSA
2056
CALL
Covista Inc
CVSA
$3.94B
| $1.94M | ﹤0.01% |
19,300
+18,100
| +1,508% | +$1.81M |
|
2057
PUT
CSX Corp
CSX
$98.6B
| $1.94M | ﹤0.01% |
65,900
-54,200
| -45% | -$1.72M |
|
2058
CALL
Floor & Decor
FND
$5.81B
| $1.94M | ﹤0.01% |
24,100
-16,900
| -41% | -$1.6M |
|
2059
Intuitive Machines
LUNR
$2.07B
| $1.94M | ﹤0.01% |
260,354
+235,960
| +967% | +$3.71M |
|
|
SERV
2060
CALL
Serve Robotics
SERV
$409M
| $1.94M | ﹤0.01% |
337,100
-147,300
| -30% | -$1.93M |
|
2061
CALL
Alcon
ALC
$33.1B
| $1.94M | ﹤0.01% |
20,400
+11,500
| +129% | +$1.03M |
|
2062
CALL
TransDigm Group
TDG
$69.2B
| $1.94M | ﹤0.01% |
1,400
-6,600
| -83% | -$8.8M |
|
2063
CALL
Weyerhaeuser
WY
$17.3B
| $1.94M | ﹤0.01% |
66,100
+29,300
| +80% | +$872K |
|
2064
CALL
RingCentral
RNG
$4.05B
| $1.93M | ﹤0.01% |
78,100
-8,600
| -10% | -$268K |
|
2065
GE Vernova
GEV
$270B
| $1.93M | ﹤0.01% |
6,324
+2,914
| +85% | +$1.02M |
|
|
DFS
2066
PUT
DELISTED
Discover Financial Services
DFS
| $1.93M | ﹤0.01% |
11,300
-16,300
| -59% | -$2.98M |
|
2067
BWX Technologies
BWXT
$16B
| $1.93M | ﹤0.01% |
19,523
+5,793
| +42% | +$629K |
|
2068
CALL
Infosys
INFY
$45B
| $1.93M | ﹤0.01% |
105,500
-15,900
| -13% | -$330K |
|
2069
CALL
nVent Electric
NVT
$24.5B
| $1.92M | ﹤0.01% |
36,700
+25,500
| +228% | +$1.61M |
|
2070
FedEx
FDX
$74.5B
| $1.92M | ﹤0.01% |
7,868
-5,612
| -42% | -$1.45M |
|
2071
Take-Two Interactive
TTWO
$43B
| $1.92M | ﹤0.01% |
+9,259
| New | +$1.85M |
|
|
CNH
2072
PUT
CNH Industrial
CNH
$13.8B
| $1.92M | ﹤0.01% |
156,000
+148,100
| +1,875% | +$1.86M |
|
2073
LyondellBasell Industries
LYB
$19.5B
| $1.91M | ﹤0.01% |
27,201
+25,940
| +2,057% | +$1.95M |
|
2074
PUT
AutoZone
AZO
$48.3B
| $1.91M | ﹤0.01% |
500
-4,700
| -90% | -$16.2M |
|
2075
Cintas
CTAS
$82.4B
| $1.91M | ﹤0.01% |
+9,275
| New | +$1.85M |
|
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.