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 | |
|---|---|---|---|---|---|---|
226
CALL
Las Vegas Sands
LVS
$30.5B
| $56.5M | 0.05% |
1,062,600
+240,900
| +29% | +$10.3M |
|
227
CALL
Expedia Group
EXPE
$31.9B
| $56.1M | 0.05% |
335,800
-300
| -0.1% | -$46.4K |
|
|
X
228
PUT
DELISTED
US Steel
X
| $55.8M | 0.05% |
2,319,300
+33,200
| +1% | +$830K |
|
229
CALL
CVS Health
CVS
$140B
| $55.5M | 0.05% |
675,000
+14,600
| +2% | +$1.22M |
|
|
230
PUT
CVS Health
CVS
$140B
| $55.2M | 0.05% |
671,200
+32,600
| +5% | +$2.73M |
|
231
PUT
Etsy
ETSY
$7.82B
| $54.8M | 0.05% |
274,800
+9,300
| +4% | +$1.89M |
|
232
PUT
Trade Desk
TTD
$8.39B
| $54.2M | 0.05% |
706,300
+38,800
| +6% | +$3M |
|
233
CALL
CrowdStrike
CRWD
$191B
| $53.4M | 0.05% |
850,000
-18,800
| -2% | -$1.21M |
|
234
PUT
Workday
WDAY
$33.3B
| $53.2M | 0.05% |
226,100
| – | – |
|
235
CALL
Biogen
BIIB
$29.8B
| $53.2M | 0.05% |
152,600
+5,100
| +3% | +$1.67M |
|
236
PUT
Blackrock
BLK
$161B
| $52.8M | 0.05% |
60,100
| – | – |
|
237
CALL
Gilead Sciences
GILD
$163B
| $52.3M | 0.05% |
757,000
+88,800
| +13% | +$6.24M |
|
238
CALL
Strategy Inc
MSTR
$36.2B
| $52M | 0.05% |
799,000
+70,000
| +10% | +$4.49M |
|
239
CALL
UnitedHealth
UNH
$393B
| $51.9M | 0.05% |
128,300
+3,800
| +3% | +$1.57M |
|
240
PUT
Plug Power
PLUG
$3.22B
| $51.6M | 0.05% |
1,549,600
+16,300
| +1% | +$437K |
|
241
PUT
Direxion Daily Technology Bull 3x ETF
TECL
$5.64B
| $51.6M | 0.05% |
888,000
+11,100
| +1% | +$699K |
|
242
PUT
United Parcel Service
UPS
$99.1B
| $51.2M | 0.05% |
243,500
+3,600
| +2% | +$711K |
|
243
PUT
Royal Caribbean
RCL
$77.3B
| $51.1M | 0.05% |
594,500
+10,000
| +2% | +$809K |
|
244
PUT
Eli Lilly
LLY
$1.04T
| $50.8M | 0.05% |
220,000
+25,900
| +13% | +$6.39M |
|
245
PUT
Twilio
TWLO
$28B
| $50.7M | 0.05% |
130,900
+9,200
| +8% | +$3.35M |
|
246
CALL
Lam Research
LRCX
$400B
| $50.4M | 0.05% |
796,000
+262,000
| +49% | +$15.9M |
|
247
PUT
PepsiCo
PEP
$185B
| $50.4M | 0.05% |
339,800
+3,700
| +1% | +$573K |
|
248
PUT
Wynn Resorts
WYNN
$9.85B
| $49.4M | 0.05% |
403,400
-4,000
| -1% | -$395K |
|
249
PUT
Delta Air Lines
DAL
$55.6B
| $49.1M | 0.05% |
1,110,700
+15,400
| +1% | +$629K |
|
250
PUT
Futu Holdings
FUTU
$14.8B
| $48.8M | 0.05% |
302,800
+10,100
| +3% | +$1.11M |
|
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.