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 | |
|---|---|---|---|---|---|---|
376
CALL
S&P Global
SPGI
$127B
| $26.7M | 0.02% |
64,700
+3,800
| +6% | +$1.65M |
|
377
CALL
Clorox
CLX
$11.6B
| $26.7M | 0.02% |
149,100
+13,200
| +10% | +$2.27M |
|
378
PUT
Illumina
ILMN
$28.9B
| $26.6M | 0.02% |
58,185
+309
| +0.5% | +$142K |
|
379
TSMC
TSM
$2.18T
| $26.6M | 0.02% |
224,816
-17,563
| -7% | -$2.06M |
|
380
CALL
FuboTV Inc
FUBO
$265M
| $26.6M | 0.02% |
71,617
+13,484
| +23% | +$4.41M |
|
381
PUT
Marvell Technology
MRVL
$189B
| $26.4M | 0.02% |
462,300
-2,900
| -0.6% | -$174K |
|
382
CALL
Amgen
AMGN
$198B
| $26.4M | 0.02% |
107,000
+800
| +0.8% | +$184K |
|
383
PUT
Elevance Health
ELV
$84.4B
| $26.3M | 0.02% |
68,600
-200
| -0.3% | -$76K |
|
384
PUT
D.R. Horton
DHI
$40.4B
| $26.1M | 0.02% |
281,600
-1,800
| -0.6% | -$166K |
|
385
CALL
Charter Communications
CHTR
$15.9B
| $26M | 0.02% |
36,000
| – | – |
|
386
CALL
Electronic Arts
EA
$52.4B
| $26M | 0.02% |
182,600
+3,800
| +2% | +$533K |
|
387
PUT
Li Auto
LI
$12B
| $25.9M | 0.02% |
745,400
+24,800
| +3% | +$746K |
|
388
CALL
Rocket Companies
RKT
$38B
| $25.8M | 0.02% |
1,358,200
+96,200
| +8% | +$1.68M |
|
389
Direxion Daily S&P 500 Bull 3x ETF
SPXL
$6.82B
| $25.7M | 0.02% |
237,026
+10,281
| +5% | +$1.19M |
|
390
CALL
Blackstone
BX
$150B
| $25.5M | 0.02% |
263,000
+16,000
| +6% | +$1.86M |
|
391
CALL
ProShares Ultra Bloomberg Natural Gas
BOIL
$422M
| $24.9M | 0.02% |
4,013
+102
| +3% | +$1M |
|
392
CALL
Constellation Brands
STZ
$22.6B
| $24.9M | 0.02% |
+107,100
| New | +$23.4M |
|
|
TYNS
393
CALL
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $24.8M | 0.02% |
222,000
+7,800
| +4% | +$872K |
|
394
CALL
US Bancorp Series B Preferred Stock
USB.PRH
$747M
| $24.7M | 0.02% |
429,600
+4,300
| +1% | +$108K |
|
395
CALL
First Solar
FSLR
$22.4B
| $24.7M | 0.02% |
274,200
+6,100
| +2% | +$566K |
|
396
PUT
Cleveland-Cliffs
CLF
$5.39B
| $24.6M | 0.02% |
1,115,300
+49,000
| +5% | +$1.12M |
|
397
CALL
Tilray
TLRY
$514M
| $24.5M | 0.02% |
144,060
+5,750
| +4% | +$788K |
|
398
PUT
Newmont
NEM
$102B
| $24.4M | 0.02% |
388,800
-18,300
| -4% | -$1.08M |
|
|
B
399
PUT
Barrick Mining
B
$62.8B
| $24.4M | 0.02% |
1,187,400
+4,200
| +0.4% | +$84.3K |
|
|
VMW
400
PUT
DELISTED
VMware, Inc
VMW
| $24.4M | 0.02% |
156,200
+36,500
| +30% | +$5.53M |
|
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.