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 | |
|---|---|---|---|---|---|---|
2226
PUT
Energy Fuels
UUUU
$2.82B
| $1.64M | ﹤0.01% |
439,500
-84,100
| -16% | -$403K |
|
2227
PUT
Signet Jewelers
SIG
$3.55B
| $1.64M | ﹤0.01% |
28,200
-27,400
| -49% | -$1.57M |
|
2228
PUT
Globe Life
GL
$13.5B
| $1.63M | ﹤0.01% |
12,400
-33,900
| -73% | -$4.15M |
|
2229
Goodyear
GT
$2.07B
| $1.63M | ﹤0.01% |
176,675
-124,016
| -41% | -$1.13M |
|
2230
PUT
CNX Resources
CNX
$4.85B
| $1.63M | ﹤0.01% |
51,800
-111,700
| -68% | -$3.36M |
|
|
SF
2231
PUT
Stifel
SF
$12.3B
| $1.63M | ﹤0.01% |
25,950
+25,500
| +5,667% | +$1.8M |
|
|
DAY
2232
CALL
DELISTED
Dayforce
DAY
| $1.63M | ﹤0.01% |
27,900
+27,500
| +6,875% | +$1.77M |
|
2233
PUT
Oscar Health
OSCR
$8.5B
| $1.63M | ﹤0.01% |
124,000
+25,900
| +26% | +$385K |
|
2234
CALL
Darling Ingredients
DAR
$9.93B
| $1.62M | ﹤0.01% |
52,000
-55,800
| -52% | -$1.95M |
|
2235
Knight Transportation
KNX
$11.8B
| $1.62M | ﹤0.01% |
37,327
-9,703
| -21% | -$500K |
|
|
BABO
2236
PUT
YieldMax BABA Option Income Strategy ETF
BABO
$13.7M
| $1.62M | ﹤0.01% |
91,100
-50,600
| -36% | -$991K |
|
2237
CALL
Finance of America Companies
FOA
$204M
| $1.62M | ﹤0.01% |
76,100
-5,100
| -6% | -$125K |
|
2238
PUT
Genmab
GMAB
$17.7B
| $1.62M | ﹤0.01% |
82,600
+78,800
| +2,074% | +$1.65M |
|
2239
PUT
Clearway Energy Class C
CWEN
$5B
| $1.61M | ﹤0.01% |
53,200
+42,000
| +375% | +$1.14M |
|
2240
PUT
DXC Technology
DXC
$1.63B
| $1.61M | ﹤0.01% |
94,400
+91,500
| +3,155% | +$1.78M |
|
2241
CALL
Group 1 Automotive
GPI
$3.94B
| $1.6M | ﹤0.01% |
4,200
+2,000
| +91% | +$877K |
|
2242
CALL
Huntsman Corp
HUN
$2.24B
| $1.6M | ﹤0.01% |
101,600
-16,500
| -14% | -$281K |
|
2243
CALL
IES Holdings
IESC
$12.5B
| $1.6M | ﹤0.01% |
9,700
+5,900
| +155% | +$1.23M |
|
2244
CALL
Rogers Communications
RCI
$17.7B
| $1.6M | ﹤0.01% |
+59,800
| New | +$1.69M |
|
2245
Groupon
GRPN
$980M
| $1.59M | ﹤0.01% |
84,988
-8,690
| -9% | -$110K |
|
2246
PUT
Core & Main
CNM
$8.17B
| $1.59M | ﹤0.01% |
33,000
+19,100
| +137% | +$990K |
|
2247
PUT
Kanzhun
BZ
$6.89B
| $1.59M | ﹤0.01% |
83,100
-15,100
| -15% | -$246K |
|
|
NNE
2248
PUT
Nano Nuclear Energy
NNE
$813M
| $1.59M | ﹤0.01% |
60,100
-44,200
| -42% | -$1.35M |
|
2249
CALL
Fox Class B
FOX
$20.7B
| $1.59M | ﹤0.01% |
28,400
-31,400
| -53% | -$1.56M |
|
|
CNH
2250
CALL
CNH Industrial
CNH
$13.8B
| $1.59M | ﹤0.01% |
129,400
+107,700
| +496% | +$1.35M |
|
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.