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 | Miscellaneous | 97.72% |
| 2 | Technology | 0.49% |
| 3 | Consumer Discretionary | 0.39% |
| 4 | Communication Services | 0.27% |
| 5 | Healthcare | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
301
PUT
Accenture
ACN
$114B
| $37.2M | 0.03% |
124,000
+10,400
| +9% | +$3.38M |
|
302
PUT
Skyworks Solutions
SWKS
$11.1B
| $37M | 0.03% |
195,700
+10,000
| +5% | +$1.83M |
|
303
PUT
Wayfair
W
$13.6B
| $36.7M | 0.03% |
119,500
+3,800
| +3% | +$1.07M |
|
304
CALL
Vale
VALE
$65B
| $36.6M | 0.03% |
1,656,000
+414,800
| +33% | +$8.14M |
|
305
CALL
Union Pacific
UNP
$172B
| $36.5M | 0.03% |
163,300
+2,500
| +2% | +$540K |
|
306
CALL
Chewy
CHWY
$9.69B
| $36.3M | 0.03% |
450,600
+4,700
| +1% | +$389K |
|
|
ATVI
307
CALL
DELISTED
Activision Blizzard
ATVI
| $36.2M | 0.03% |
385,100
-13,000
| -3% | -$1.09M |
|
|
X
308
CALL
DELISTED
US Steel
X
| $35.7M | 0.03% |
1,483,600
+39,300
| +3% | +$983K |
|
309
CALL
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$244M
| $35.4M | 0.03% |
3,292,000
+117,600
| +4% | +$2.15M |
|
310
CALL
Mercado Libre
MELI
$100B
| $35.4M | 0.03% |
22,900
+400
| +2% | +$693K |
|
311
PUT
ProShares Ultra Bloomberg Natural Gas
BOIL
$417M
| $35.3M | 0.03% |
6,207
-89
| -1% | -$877K |
|
312
PUT
BP
BP
$113B
| $35M | 0.03% |
1,293,700
+6,000
| +0.5% | +$150K |
|
313
CALL
Broadcom
AVGO
$1.7T
| $35M | 0.03% |
745,000
-5,000
| -0.7% | -$243K |
|
314
PUT
XPeng
XPEV
$10.5B
| $35M | 0.03% |
800,900
+13,100
| +2% | +$520K |
|
315
PUT
Lyft
LYFT
$6.33B
| $34.4M | 0.03% |
555,300
-400
| -0.1% | -$21.2K |
|
316
PUT
Take-Two Interactive
TTWO
$40.1B
| $34.1M | 0.03% |
190,300
+26,000
| +16% | +$4.21M |
|
317
PUT
Darden Restaurants
DRI
$24.6B
| $33.9M | 0.03% |
229,000
| – | – |
|
318
PUT
Datadog
DDOG
$76.5B
| $33.9M | 0.03% |
324,200
+28,000
| +9% | +$3.54M |
|
319
CALL
ProShares UltraShort Health Care
RXD
$3.06M
| $33.9M | 0.03% |
909,950
+136,350
| +18% | +$3.67M |
|
320
PUT
Simon Property Group
SPG
$67.8B
| $33.6M | 0.03% |
255,800
-600
| -0.2% | -$78.1K |
|
|
321
PUT
Union Pacific
UNP
$172B
| $33.6M | 0.03% |
150,200
-2,500
| -2% | -$540K |
|
322
CALL
Southwest Airlines
LUV
$19.4B
| $33.6M | 0.03% |
623,200
+84,000
| +16% | +$4.24M |
|
323
CALL
PENN Entertainment
PENN
$2.29B
| $33.4M | 0.03% |
437,100
+57,900
| +15% | +$4.26M |
|
324
PUT
RTX Corp
RTX
$271B
| $33.4M | 0.03% |
387,014
+12,815
| +3% | +$1.1M |
|
|
KFYP
325
CALL
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $33.2M | 0.03% |
572,400
+13,300
| +2% | +$421K |
|
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 84 new positions and exited 267, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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 84 new positions and closed 267 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.