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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
226
CALL
Expedia Group
EXPE
$31.3B
| $55M | 0.05% |
336,100
+333,898
| +15,163% | +$57.3M |
|
|
X
227
PUT
DELISTED
US Steel
X
| $54.9M | 0.05% |
2,286,100
+2,274,610
| +19,796% | +$56M |
|
228
PUT
Etsy
ETSY
$7.64B
| $54.6M | 0.05% |
265,500
+263,692
| +14,585% | +$48.8M |
|
229
CALL
CrowdStrike
CRWD
$192B
| $54.6M | 0.05% |
868,800
+862,696
| +14,133% | +$46.4M |
|
230
PUT
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$156M
| $54.3M | 0.05% |
+115,225
| New | +$68.7M |
|
231
PUT
Workday
WDAY
$32.7B
| $54M | 0.05% |
226,100
+225,693
| +55,453% | +$54.3M |
|
232
PUT
CVS Health
CVS
$138B
| $53.3M | 0.05% |
638,600
+633,598
| +12,667% | +$51.9M |
|
233
PUT
Blackrock
BLK
$164B
| $52.6M | 0.05% |
60,100
+59,625
| +12,553% | +$50.4M |
|
234
PUT
Plug Power
PLUG
$3.11B
| $52.4M | 0.05% |
1,533,300
+1,518,849
| +10,510% | +$44.1M |
|
235
PUT
Futu Holdings
FUTU
$14.9B
| $52.4M | 0.05% |
292,700
+289,538
| +9,157% | +$42.1M |
|
236
PUT
Trade Desk
TTD
$8.26B
| $51.6M | 0.05% |
667,500
+660,670
| +9,673% | +$42.2M |
|
237
PUT
Direxion Daily Technology Bull 3x ETF
TECL
$5.56B
| $51.2M | 0.05% |
876,900
+867,473
| +9,202% | +$41.6M |
|
238
CALL
Biogen
BIIB
$29.2B
| $51.1M | 0.05% |
+147,500
| New | +$44.7M |
|
239
PUT
United Parcel Service
UPS
$98.5B
| $49.9M | 0.05% |
239,900
+236,386
| +6,727% | +$47.3M |
|
240
CALL
UnitedHealth
UNH
$392B
| $49.9M | 0.05% |
+124,500
| New | +$49.6M |
|
241
PUT
Royal Caribbean
RCL
$76.7B
| $49.8M | 0.05% |
+584,500
| New | +$50.9M |
|
242
PUT
Wynn Resorts
WYNN
$9.79B
| $49.8M | 0.05% |
407,400
+405,408
| +20,352% | +$51.6M |
|
243
PUT
PepsiCo
PEP
$185B
| $49.8M | 0.05% |
336,100
+333,321
| +11,994% | +$48.6M |
|
244
CALL
Strategy Inc
MSTR
$36.3B
| $48.4M | 0.05% |
729,000
+723,840
| +14,028% | +$42.8M |
|
245
PUT
Comcast
CMCSA
$84B
| $48.3M | 0.05% |
847,800
+839,654
| +10,308% | +$46.9M |
|
246
PUT
Twilio
TWLO
$27.8B
| $48M | 0.05% |
121,700
+119,682
| +5,931% | +$41.5M |
|
247
PUT
Enphase Energy
ENPH
$5.22B
| $47.6M | 0.05% |
259,400
+257,376
| +12,716% | +$37.8M |
|
248
PUT
Delta Air Lines
DAL
$54.9B
| $47.4M | 0.05% |
+1,095,300
| New | +$50.7M |
|
249
PUT
Gilead Sciences
GILD
$162B
| $47.3M | 0.05% |
+687,400
| New | +$45.9M |
|
250
CALL
Bristol-Myers Squibb
BMY
$124B
| $47M | 0.05% |
703,600
+698,934
| +14,979% | +$45.6M |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.