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 | |
|---|---|---|---|---|---|---|
251
CALL
Humana
HUM
$48B
| $56.3M | 0.04% |
212,600
+51,100
| +32% | +$13.8M |
|
252
CALL
ARK Space & Defense Innovation ETF
ARKX
$829M
| $56M | 0.04% |
1,583,700
-487,000
| -24% | -$9.62M |
|
253
PUT
Lam Research
LRCX
$400B
| $55.9M | 0.04% |
768,400
-378,800
| -33% | -$29.8M |
|
254
CALL
Direxion Daily Technology Bull 3x ETF
TECL
$5.64B
| $55.6M | 0.04% |
2,019,100
-920,300
| -31% | -$74.9M |
|
|
255
Apple
AAPL
$4.77T
| $55.3M | 0.04% |
248,768
-2,235,748
| -90% | -$518M |
|
256
CALL
State Street SPDR Portfolio Short Term Treasury ETF
SPTS
$6.07B
| $55.1M | 0.04% |
459,000
-73,800
| -14% | -$2.15M |
|
257
CALL
Accenture
ACN
$86B
| $55M | 0.04% |
176,200
+77,800
| +79% | +$27.5M |
|
258
CALL
SLB Ltd
SLB
$71B
| $54.6M | 0.04% |
1,306,900
+90,600
| +7% | +$3.71M |
|
259
CALL
lululemon athletica
LULU
$12.9B
| $54.6M | 0.03% |
192,800
+10,700
| +6% | +$3.93M |
|
260
PUT
Airbnb
ABNB
$84B
| $54.6M | 0.03% |
456,700
-43,200
| -9% | -$5.79M |
|
261
PUT
American Airlines Group
AAL
$10.1B
| $54.1M | 0.03% |
5,129,400
-679,100
| -12% | -$10.2M |
|
262
CALL
Capital One
COF
$124B
| $54M | 0.03% |
301,000
+132,000
| +78% | +$24.9M |
|
263
CALL
Rivian
RIVN
$25.3B
| $53.9M | 0.03% |
4,328,400
-350,800
| -7% | -$4.41M |
|
264
CALL
General Motors
GM
$74.7B
| $53.8M | 0.03% |
1,144,500
-442,800
| -28% | -$21.8M |
|
265
CALL
Intuit
INTU
$78.8B
| $53.5M | 0.03% |
87,200
+40,100
| +85% | +$24.1M |
|
|
266
Amazon
AMZN
$2.62T
| $53.5M | 0.03% |
+281,158
| New | +$61M |
|
267
CALL
Gilead Sciences
GILD
$163B
| $53.2M | 0.03% |
474,600
+177,600
| +60% | +$18.3M |
|
268
CALL
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$109M
| $52.9M | 0.03% |
1,990,000
-1,605,600
| -45% | -$41M |
|
269
PUT
Arista Networks
ANET
$222B
| $52.6M | 0.03% |
678,800
+57,300
| +9% | +$5.81M |
|
270
CALL
BP
BP
$111B
| $52.6M | 0.03% |
1,555,500
+228,800
| +17% | +$7.47M |
|
271
CALL
Texas Instruments
TXN
$269B
| $52.2M | 0.03% |
290,400
-91,900
| -24% | -$17.2M |
|
272
CALL
United Parcel Service
UPS
$99.1B
| $52.1M | 0.03% |
473,500
-131,700
| -22% | -$15.7M |
|
273
PUT
Royal Caribbean
RCL
$77.1B
| $51.9M | 0.03% |
252,600
-281,000
| -53% | -$66.3M |
|
274
CALL
Carnival Corporation Ltd
CCL
$36B
| $51.4M | 0.03% |
2,631,300
-191,600
| -7% | -$4.56M |
|
275
CALL
Dollar Tree
DLTR
$23.9B
| $51M | 0.03% |
679,800
+154,800
| +29% | +$11.1M |
|
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.