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 | |
|---|---|---|---|---|---|---|
1851
CALL
Corsair Gaming
CRSR
$1.05B
| $2.47M | ﹤0.01% |
278,500
+145,500
| +109% | +$1.44M |
|
1852
CALL
Yeti Holdings
YETI
$3.82B
| $2.46M | ﹤0.01% |
74,400
+7,500
| +11% | +$272K |
|
1853
PUT
Axsome Therapeutics
AXSM
$12.4B
| $2.46M | ﹤0.01% |
21,100
-109,400
| -84% | -$12.5M |
|
1854
PUT
Genuine Parts
GPC
$17.1B
| $2.45M | ﹤0.01% |
20,600
+14,000
| +212% | +$1.68M |
|
1855
PUT
BridgeBio Pharma
BBIO
$16.5B
| $2.45M | ﹤0.01% |
70,900
-80,600
| -53% | -$2.72M |
|
1856
CALL
FuelCell Energy
FCEL
$1.7B
| $2.45M | ﹤0.01% |
534,100
-117,600
| -18% | -$877K |
|
1857
CALL
RB Global
RBA
$20.8B
| $2.45M | ﹤0.01% |
24,400
-40,400
| -62% | -$3.85M |
|
1858
CALL
Equinix
EQIX
$107B
| $2.45M | ﹤0.01% |
3,000
-2,100
| -41% | -$1.89M |
|
1859
CALL
Box
BOX
$4.02B
| $2.44M | ﹤0.01% |
79,200
-17,600
| -18% | -$570K |
|
1860
PUT
Alliance Resource Partners
ARLP
$3.18B
| $2.44M | ﹤0.01% |
89,500
-2,600
| -3% | -$69.4K |
|
1861
GXO Logistics
GXO
$6.06B
| $2.43M | ﹤0.01% |
+62,268
| New | +$2.6M |
|
1862
PUT
Ball Corp
BALL
$17B
| $2.43M | ﹤0.01% |
46,700
+25,800
| +123% | +$1.35M |
|
1863
CALL
Ralph Lauren
RL
$22.2B
| $2.43M | ﹤0.01% |
11,000
-8,300
| -43% | -$2.06M |
|
1864
CALL
Evergy
EVRG
$20.1B
| $2.43M | ﹤0.01% |
35,200
+31,200
| +780% | +$2.04M |
|
1865
PUT
CRISPR Therapeutics
CRSP
$4.58B
| $2.43M | ﹤0.01% |
71,300
-55,400
| -44% | -$2.35M |
|
1866
CALL
Range Resources
RRC
$9.11B
| $2.42M | ﹤0.01% |
60,700
-78,200
| -56% | -$3.01M |
|
1867
PUT
Stratasys
SSYS
$697M
| $2.42M | ﹤0.01% |
247,200
+246,500
| +35,214% | +$2.53M |
|
1868
PUT
W.P. Carey
WPC
$17.1B
| $2.42M | ﹤0.01% |
39,200
+14,800
| +61% | +$876K |
|
|
FL
1869
CALL
DELISTED
Foot Locker
FL
| $2.42M | ﹤0.01% |
171,400
-137,700
| -45% | -$2.55M |
|
1870
CALL
Wingstop
WING
$3.68B
| $2.41M | ﹤0.01% |
10,700
-30,200
| -74% | -$7.86M |
|
|
BECN
1871
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $2.4M | ﹤0.01% |
19,430
+18,194
| +1,472% | +$2.12M |
|
1872
CALL
Tidewater
TDW
$3.91B
| $2.4M | ﹤0.01% |
56,800
+7,200
| +15% | +$358K |
|
|
1873
PUT
Tidewater
TDW
$3.91B
| $2.4M | ﹤0.01% |
56,700
+49,900
| +734% | +$2.48M |
|
1874
CALL
Bit Digital
BTBT
$484M
| $2.39M | ﹤0.01% |
1,185,200
-349,400
| -23% | -$1.01M |
|
1875
CALL
Western Midstream Partners
WES
$19.6B
| $2.39M | ﹤0.01% |
58,400
-24,400
| -29% | -$994K |
|
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.