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 | |
|---|---|---|---|---|---|---|
301
PUT
Wayfair
W
$11.1B
| $36.5M | 0.04% |
115,700
+114,560
| +10,049% | +$35.9M |
|
302
CALL
Trade Desk
TTD
$8.26B
| $36.5M | 0.04% |
471,700
+467,250
| +10,500% | +$29.9M |
|
303
CALL
Broadcom
AVGO
$1.89T
| $35.8M | 0.03% |
+750,000
| New | +$34.8M |
|
304
PUT
Skyworks Solutions
SWKS
$9.5B
| $35.6M | 0.03% |
185,700
+183,847
| +9,922% | +$32.6M |
|
305
CALL
Chewy
CHWY
$8.81B
| $35.5M | 0.03% |
445,900
+443,127
| +15,980% | +$34.3M |
|
306
CALL
Union Pacific
UNP
$174B
| $35.4M | 0.03% |
+160,800
| New | +$35.8M |
|
307
CALL
Mercado Libre
MELI
$91.2B
| $35M | 0.03% |
+22,500
| New | +$33M |
|
308
PUT
XPeng
XPEV
$12.3B
| $35M | 0.03% |
787,800
+778,140
| +8,055% | +$26.5M |
|
309
CALL
Lam Research
LRCX
$399B
| $34.7M | 0.03% |
534,000
+530,530
| +15,289% | +$33.5M |
|
|
X
310
CALL
DELISTED
US Steel
X
| $34.7M | 0.03% |
1,444,300
+1,435,532
| +16,372% | +$35.3M |
|
311
CALL
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$254M
| $34.1M | 0.03% |
3,174,400
+3,138,080
| +8,640% | +$62.7M |
|
312
PUT
BP
BP
$112B
| $34M | 0.03% |
+1,287,700
| New | +$33.8M |
|
313
PUT
Lyft
LYFT
$5.57B
| $33.6M | 0.03% |
555,700
+550,621
| +10,841% | +$31.7M |
|
|
314
PUT
Union Pacific
UNP
$174B
| $33.6M | 0.03% |
+152,700
| New | +$34M |
|
315
PUT
Accenture
ACN
$85.7B
| $33.5M | 0.03% |
+113,600
| New | +$32.5M |
|
316
PUT
Simon Property Group
SPG
$73.4B
| $33.5M | 0.03% |
+256,400
| New | +$31.9M |
|
317
PUT
Darden Restaurants
DRI
$22.2B
| $33.4M | 0.03% |
229,000
+228,229
| +29,602% | +$32.1M |
|
|
318
Palantir
PLTR
$299B
| $33.2M | 0.03% |
1,257,642
-1,110,827
| -47% | -$25.7M |
|
|
KFYP
319
CALL
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $32.9M | 0.03% |
559,100
+555,395
| +14,990% | +$17.6M |
|
320
PUT
ASML
ASML
$692B
| $32.5M | 0.03% |
47,000
+46,022
| +4,706% | +$30.4M |
|
321
CALL
AstraZeneca
AZN
$263B
| $32.3M | 0.03% |
+269,900
| New | +$29.6M |
|
322
PUT
RTX Corp
RTX
$262B
| $31.9M | 0.03% |
374,199
+371,106
| +11,998% | +$31.2M |
|
323
PUT
Bilibili
BILI
$7.4B
| $31.8M | 0.03% |
261,000
+255,226
| +4,420% | +$27.7M |
|
324
CALL
iShares Core MSCI Emerging Markets ETF
IEMG
$153B
| $31.4M | 0.03% |
484,700
+479,848
| +9,890% | +$31.6M |
|
325
CALL
D.R. Horton
DHI
$40.4B
| $31.4M | 0.03% |
347,900
+345,347
| +13,527% | +$32.4M |
|
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.