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 | |
|---|---|---|---|---|---|---|
1276
CALL
Stem
STEM
$49.2M
| $4.49M | ﹤0.01% |
6,240
+6,188
| +11,900% | +$3.37M |
|
1277
PUT
BHP
BHP
$213B
| $4.49M | ﹤0.01% |
69,054
+68,298
| +9,034% | +$4.52M |
|
1278
CALL
Estee Lauder
EL
$29B
| $4.48M | ﹤0.01% |
14,100
+13,909
| +7,282% | +$4.22M |
|
1279
CALL
United Therapeutics
UTHR
$26.3B
| $4.47M | ﹤0.01% |
+24,900
| New | +$4.74M |
|
1280
PUT
FIVE9
FIVN
$1.77B
| $4.46M | ﹤0.01% |
24,300
+24,073
| +10,605% | +$4.15M |
|
|
CERN
1281
CALL
DELISTED
Cerner Corp
CERN
| $4.46M | ﹤0.01% |
57,000
+56,678
| +17,602% | +$4.36M |
|
1282
PUT
Service Corp International
SCI
$11.4B
| $4.45M | ﹤0.01% |
+83,100
| New | +$4.41M |
|
1283
CALL
Entegris
ENTG
$19.7B
| $4.45M | ﹤0.01% |
36,200
+36,041
| +22,667% | +$4.14M |
|
|
HZON
1284
CALL
DELISTED
Horizon Acquisition Corporation II
HZON
| $4.44M | ﹤0.01% |
454,500
+454,217
| +160,501% | +$4.55M |
|
1285
Tyson Foods
TSN
$20.2B
| $4.44M | ﹤0.01% |
60,144
+13,966
| +30% | +$1.08M |
|
1286
PUT
NetApp
NTAP
$32.9B
| $4.43M | ﹤0.01% |
+54,200
| New | +$4.23M |
|
1287
PUT
General Dynamics
GD
$105B
| $4.42M | ﹤0.01% |
23,500
+23,043
| +5,042% | +$4.35M |
|
1288
CALL
Universal Display
OLED
$3.71B
| $4.42M | ﹤0.01% |
19,900
+19,612
| +6,810% | +$4.3M |
|
1289
PUT
Idexx Laboratories
IDXX
$42.9B
| $4.42M | ﹤0.01% |
7,000
+6,971
| +24,038% | +$3.85M |
|
1290
CALL
Public Storage
PSA
$60.2B
| $4.42M | ﹤0.01% |
14,700
+14,599
| +14,454% | +$4.09M |
|
1291
CALL
Royal Gold
RGLD
$17.1B
| $4.42M | ﹤0.01% |
38,700
+38,239
| +8,295% | +$4.51M |
|
1292
State Street SPDR S&P Biotech ETF
XBI
$10.1B
| $4.41M | ﹤0.01% |
32,583
+24,792
| +318% | +$3.26M |
|
1293
PUT
JetBlue
JBLU
$1.96B
| $4.4M | ﹤0.01% |
262,500
+260,540
| +13,293% | +$5.05M |
|
1294
Cloudflare
NET
$93B
| $4.4M | ﹤0.01% |
+41,610
| New | +$3.44M |
|
1295
CALL
Invesco CurrencyShares Euro Currency Trust
FXE
$331M
| $4.4M | ﹤0.01% |
39,700
+39,332
| +10,688% | +$4.44M |
|
1296
State Street SPDR S&P Regional Banking ETF
KRE
$4.86B
| $4.4M | ﹤0.01% |
+67,124
| New | +$4.59M |
|
|
WW
1297
PUT
DELISTED
WW International
WW
| $4.4M | ﹤0.01% |
+121,700
| New | +$4.17M |
|
|
JKS
1298
CALL
JinkoSolar
JKS
$775M
| $4.4M | ﹤0.01% |
+78,500
| New | +$3M |
|
|
YALA
1299
PUT
Yalla Group
YALA
$786M
| $4.4M | ﹤0.01% |
220,000
+219,549
| +48,680% | +$4.43M |
|
1300
PUT
Hydrofarm Holdings
HYFM
$3.13M
| $4.38M | ﹤0.01% |
7,420
+7,385
| +21,100% | +$4.34M |
|
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.