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 |
GE Aerospace
GE
|
+$36M |
| 2 |
Advanced Micro Devices
AMD
|
+$19.4M |
| 3 |
iShares MSCI EAFE ETF
EFA
|
+$10.2M |
| 4 |
Micron Technology
MU
|
+$6.31M |
| 5 |
Alibaba
BABA
|
+$6.19M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$25.9M |
| 2 |
SPDR Gold Trust
GLD
|
+$15.3M |
| 3 |
Amazon
AMZN
|
+$9.53M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.03M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.73M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.49% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
326
CALL
American Express
AXP
$238B
| $32.6M | 0.03% |
195,000
-31,000
| -14% | -$5.18M |
|
327
PUT
ASML
ASML
$692B
| $32.5M | 0.03% |
47,800
+800
| +2% | +$629K |
|
328
CALL
D.R. Horton
DHI
$40.4B
| $32.3M | 0.03% |
348,400
+500
| +0.1% | +$46.1K |
|
329
CALL
AstraZeneca
AZN
$263B
| $32.3M | 0.03% |
267,900
-2,000
| -0.7% | -$233K |
|
330
PUT
Amgen
AMGN
$198B
| $32.3M | 0.03% |
130,700
+1,800
| +1% | +$414K |
|
331
Palantir
PLTR
$299B
| $32.2M | 0.03% |
1,303,452
+45,810
| +4% | +$1.12M |
|
332
CALL
Wynn Resorts
WYNN
$9.79B
| $32.2M | 0.03% |
262,800
+6,100
| +2% | +$602K |
|
333
CALL
Clover Health Investments
CLOV
$2.46B
| $32.1M | 0.03% |
2,606,300
+367,400
| +16% | +$3.14M |
|
334
CALL
BP
BP
$112B
| $32.1M | 0.03% |
1,186,300
+74,400
| +7% | +$1.86M |
|
335
PUT
Western Digital
WDC
$192B
| $32M | 0.03% |
598,128
+63,239
| +12% | +$3M |
|
336
PUT
Bilibili
BILI
$7.4B
| $31.8M | 0.03% |
262,600
+1,600
| +0.6% | +$137K |
|
337
CALL
iShares Core MSCI Emerging Markets ETF
IEMG
$153B
| $31.6M | 0.03% |
488,000
+3,300
| +0.7% | +$210K |
|
338
PUT
Upstart Holdings
UPST
$2.74B
| $31.3M | 0.03% |
252,400
+9,800
| +4% | +$1.93M |
|
339
PUT
eBay
EBAY
$49.3B
| $30.9M | 0.03% |
442,600
+26,600
| +6% | +$1.91M |
|
340
PUT
Best Buy
BBY
$18.4B
| $30.8M | 0.03% |
265,000
+1,800
| +0.7% | +$202K |
|
341
CALL
Royal Caribbean
RCL
$76.7B
| $30.8M | 0.03% |
358,100
+17,200
| +5% | +$1.39M |
|
342
PUT
Spotify
SPOT
$97.5B
| $30.7M | 0.03% |
114,300
+3,800
| +3% | +$896K |
|
|
343
Micron Technology
MU
$1.08T
| $30.7M | 0.03% |
383,115
+84,017
| +28% | +$6.31M |
|
|
344
PUT
iShares Core MSCI Emerging Markets ETF
IEMG
$153B
| $30.6M | 0.03% |
461,300
+4,900
| +1% | +$312K |
|
345
CALL
XPeng
XPEV
$12.3B
| $30.5M | 0.03% |
699,200
+134,900
| +24% | +$5.36M |
|
346
PUT
Cloudflare
NET
$95.5B
| $29.9M | 0.03% |
286,300
-1,600
| -0.6% | -$191K |
|
347
PUT
Charter Communications
CHTR
$15.9B
| $29.7M | 0.03% |
41,200
| – | – |
|
348
Intuitive Surgical
ISRG
$121B
| $29.5M | 0.03% |
95,532
+7,875
| +9% | +$2.64M |
|
349
PUT
Dow Inc
DOW
$22.5B
| $29.4M | 0.03% |
463,700
+35,300
| +8% | +$2.16M |
|
350
PUT
Norwegian Cruise Line
NCLH
$8.87B
| $29.4M | 0.03% |
995,900
+22,300
| +2% | +$567K |
|
Similar funds
Simplex Trading's Q3 2021 Portfolio in Review
As of Q3 2021, Simplex Trading held 10,062 positions worth $107B, up 3.4% from $104B the previous quarter. Its ten largest holdings account for 41% of the portfolio.
Trading was light in Q3 2021: portfolio turnover was 3.5%. Simplex Trading opened 86 new positions and exited 271, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.47% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q3 2021 buy was Olo Inc: 143,230 shares worth $4.91M.
- Simplex Trading added most to GE Aerospace in Q3 2021, an estimated $36M increase.
- Simplex Trading's biggest Q3 2021 reduction was NVIDIA, cutting an estimated $25.9M.
- Simplex Trading fully exited Amazon in Q3 2021, selling an estimated $9.53M.
- Simplex Trading's ten largest holdings make up 41% of its $107B portfolio in Q3 2021.
- Simplex Trading opened 86 new positions and closed 271 in Q3 2021.
- Simplex Trading's portfolio value rose 3.4% quarter-over-quarter to $107B.
Based on Simplex Trading's 13F filing for Q3 2021, filed 28 Oct 2021.