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 | |
|---|---|---|---|---|---|---|
226
CALL
Apollo Global Management
APO
$68.7B
| $60.8M | 0.04% |
444,200
-351,500
| -44% | -$54.1M |
|
|
UWC
227
PUT
DELISTED
PROSHARES TR ULTRA RUSSELL3000
UWC
| $60.7M | 0.04% |
1,025,100
-305,700
| -23% | -$18.1M |
|
228
PUT
Amgen
AMGN
$199B
| $60.6M | 0.04% |
194,500
+38,000
| +24% | +$11.2M |
|
229
CALL
ServiceNow
NOW
$100B
| $60.2M | 0.04% |
378,000
-67,000
| -15% | -$12.9M |
|
230
CALL
Vistra
VST
$56.3B
| $60M | 0.04% |
511,300
-277,500
| -35% | -$41.5M |
|
231
PUT
GE Vernova
GEV
$273B
| $59.9M | 0.04% |
196,200
+100,300
| +105% | +$35M |
|
232
CALL
Caterpillar
CAT
$413B
| $59.5M | 0.04% |
180,300
+27,900
| +18% | +$9.94M |
|
233
CALL
Bristol-Myers Squibb
BMY
$125B
| $59.2M | 0.04% |
970,200
-639,900
| -40% | -$37.3M |
|
234
PUT
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$256M
| $59.2M | 0.04% |
2,491,100
+319,800
| +15% | +$9.04M |
|
235
CALL
Dell
DELL
$287B
| $58.9M | 0.04% |
646,700
-333,100
| -34% | -$35.2M |
|
236
CALL
First Solar
FSLR
$22.4B
| $58.9M | 0.04% |
466,000
+183,700
| +65% | +$28.7M |
|
237
PUT
T-Mobile US
TMUS
$207B
| $58.8M | 0.04% |
220,600
-26,700
| -11% | -$6.58M |
|
238
CALL
Newmont
NEM
$103B
| $58.7M | 0.04% |
1,215,600
-654,500
| -35% | -$28.7M |
|
239
PUT
Coca-Cola
KO
$354B
| $58.5M | 0.04% |
1,187,600
+292,600
| +33% | +$19.5M |
|
|
240
CALL
T-Mobile US
TMUS
$207B
| $58.5M | 0.04% |
219,200
-16,500
| -7% | -$4.07M |
|
241
CALL
Airbnb
ABNB
$83.9B
| $58.2M | 0.04% |
487,000
-294,400
| -38% | -$39.4M |
|
|
242
PUT
Vistra
VST
$56.3B
| $57.9M | 0.04% |
492,800
-69,200
| -12% | -$10.3M |
|
243
CALL
SoFi Technologies
SOFI
$21.9B
| $57.6M | 0.04% |
4,956,400
-1,122,900
| -18% | -$16.2M |
|
244
PUT
ARK Space & Defense Innovation ETF
ARKX
$825M
| $57.6M | 0.04% |
1,449,400
-841,800
| -37% | -$16.6M |
|
245
PUT
Proshares UltraShort Technology
REW
$3.31M
| $57.6M | 0.04% |
464,075
-221,175
| -32% | -$9.43M |
|
|
246
PUT
Newmont
NEM
$103B
| $57.3M | 0.04% |
1,187,700
-296,800
| -20% | -$13M |
|
247
PUT
Carnival Corporation Ltd
CCL
$35.7B
| $57.3M | 0.04% |
2,931,700
-537,700
| -15% | -$12.8M |
|
248
Micron Technology
MU
$1.09T
| $56.8M | 0.04% |
653,938
+613,262
| +1,508% | +$58.9M |
|
249
PUT
Verizon
VZ
$187B
| $56.8M | 0.04% |
1,252,200
-715,100
| -36% | -$29.8M |
|
250
PUT
United Airlines
UAL
$38.1B
| $56.7M | 0.04% |
820,900
-651,700
| -44% | -$61.5M |
|
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.