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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
226
PUT
Wayfair
W
$11.1B
| $63.8M | 0.05% |
1,053,500
+579,200
| +122% | +$40.3M |
|
227
PUT
Merck
MRK
$315B
| $63.6M | 0.05% |
617,400
+163,000
| +36% | +$17.6M |
|
228
CALL
Charter Communications
CHTR
$15.9B
| $62.7M | 0.05% |
142,500
-2,600
| -2% | -$1.08M |
|
229
PUT
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$254M
| $62.6M | 0.05% |
1,636,900
-2,793,900
| -63% | -$104M |
|
230
PUT
Intuitive Surgical
ISRG
$121B
| $62.5M | 0.05% |
213,700
+167,300
| +361% | +$52.2M |
|
231
CALL
Baidu
BIDU
$36.6B
| $62.4M | 0.05% |
464,100
+158,000
| +52% | +$22.2M |
|
232
CALL
Amgen
AMGN
$198B
| $62.3M | 0.05% |
231,700
+20,100
| +9% | +$5.02M |
|
233
PUT
Palantir
PLTR
$299B
| $62.2M | 0.05% |
3,888,200
-1,636,000
| -30% | -$26.1M |
|
234
PUT
Synopsys
SNPS
$72.3B
| $62.1M | 0.05% |
135,400
+68,500
| +102% | +$30.7M |
|
235
PUT
United Rentals
URI
$64.8B
| $62M | 0.05% |
139,400
-5,000
| -3% | -$2.29M |
|
236
CALL
Zoom
ZM
$25.2B
| $61.9M | 0.05% |
884,600
-92,600
| -9% | -$6.43M |
|
237
CALL
Lockheed Martin
LMT
$119B
| $61.8M | 0.05% |
151,000
+29,700
| +24% | +$13.2M |
|
238
CALL
Accenture
ACN
$85.7B
| $61.1M | 0.05% |
199,000
-29,800
| -13% | -$9.39M |
|
239
CALL
Enphase Energy
ENPH
$5.22B
| $61M | 0.05% |
507,600
+35,400
| +7% | +$5.04M |
|
|
XYZ
240
PUT
Block Inc
XYZ
$46.1B
| $60.8M | 0.05% |
1,374,800
-340,400
| -20% | -$21.1M |
|
241
CALL
Carvana
CVNA
$44.9B
| $60.7M | 0.05% |
7,229,500
-187,000
| -3% | -$1.61M |
|
242
CALL
DraftKings
DKNG
$11.3B
| $60.7M | 0.05% |
2,061,600
+734,500
| +55% | +$21.7M |
|
243
PUT
Marriott International
MAR
$97.5B
| $60.5M | 0.05% |
308,000
+84,300
| +38% | +$16.7M |
|
244
CALL
VanEck Durable High Dividend ETF
DURA
$38.5M
| $60.3M | 0.05% |
179,200
+37,000
| +26% | +$1.17M |
|
245
PUT
Spotify
SPOT
$97.5B
| $60.2M | 0.05% |
389,300
+11,000
| +3% | +$1.68M |
|
246
CALL
Li Auto
LI
$12B
| $59.9M | 0.05% |
1,681,200
+708,700
| +73% | +$28M |
|
247
PUT
Deere & Co
DE
$164B
| $59.9M | 0.05% |
158,800
-51,100
| -24% | -$21.1M |
|
248
PUT
Starbucks
SBUX
$119B
| $59.7M | 0.05% |
654,100
-450,900
| -41% | -$44.3M |
|
249
CALL
Marathon Petroleum
MPC
$92.2B
| $59.5M | 0.05% |
393,100
+85,300
| +28% | +$11.9M |
|
250
PUT
Intuit
INTU
$77.8B
| $59M | 0.05% |
115,500
-60,400
| -34% | -$30.6M |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.