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 | Miscellaneous | 97.7% |
| 2 | Technology | 0.48% |
| 3 | Consumer Discretionary | 0.39% |
| 4 | Communication Services | 0.28% |
| 5 | Healthcare | 0.27% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
701
CALL
Lumen
LUMN
$6.98B
| $10.3M | 0.01% |
+759,100
| New | +$10.5M |
|
702
PUT
Wolfspeed
WOLF
$1.47B
| $10.3M | 0.01% |
105,300
+104,407
| +11,692% | +$10.5M |
|
703
PUT
CME Group
CME
$101B
| $10.3M | 0.01% |
48,400
+47,940
| +10,422% | +$10.1M |
|
704
PUT
Pultegroup
PHM
$23.7B
| $10.3M | 0.01% |
188,000
+186,519
| +12,594% | +$10.4M |
|
705
PUT
NetEase
NTES
$76.4B
| $10.2M | 0.01% |
88,100
+86,802
| +6,687% | +$9.56M |
|
706
CALL
APA Corp
APA
$15B
| $10.1M | 0.01% |
+468,900
| New | +$9.63M |
|
707
CALL
Best Buy
BBY
$19B
| $10.1M | 0.01% |
+88,200
| New | +$10.3M |
|
|
DISCK
708
CALL
DELISTED
Discovery, Inc. Series C Common Stock
DISCK
| $10.1M | 0.01% |
330,700
+327,265
| +9,527% | +$10.2M |
|
709
CALL
Shake Shack
SHAK
$2.8B
| $10.1M | 0.01% |
94,400
+94,040
| +26,122% | +$9.49M |
|
|
SPWR
710
CALL
DELISTED
SunPower Corporation Common Stock
SPWR
| $10.1M | 0.01% |
346,400
+343,855
| +13,511% | +$8.87M |
|
|
PSTH
711
PUT
DELISTED
Pershing Square Tontine Holdings, Ltd.
PSTH
| $10.1M | 0.01% |
442,800
+434,706
| +5,371% | +$10.4M |
|
712
PUT
Petrobras
PBR
$130B
| $10.1M | 0.01% |
822,800
+815,093
| +10,576% | +$8M |
|
|
HES
713
PUT
DELISTED
Hess
HES
| $10.1M | 0.01% |
115,100
+113,173
| +5,873% | +$9.13M |
|
714
CALL
iQIYI
IQ
$849M
| $10M | 0.01% |
644,900
+639,777
| +12,488% | +$9.52M |
|
|
FISV
715
PUT
Fiserv Inc
FISV
$28.2B
| $10M | 0.01% |
93,700
+92,822
| +10,572% | +$10.8M |
|
716
CALL
Stryker
SYK
$116B
| $9.97M | 0.01% |
38,400
+38,161
| +15,967% | +$9.76M |
|
717
PUT
Kimberly-Clark
KMB
$34.9B
| $9.97M | 0.01% |
74,500
+74,040
| +16,096% | +$9.88M |
|
718
PUT
Dollar Tree
DLTR
$24.7B
| $9.93M | 0.01% |
99,800
+98,970
| +11,924% | +$10.8M |
|
719
PUT
Nutanix
NTNX
$18.4B
| $9.93M | 0.01% |
259,700
+257,532
| +11,879% | +$8.02M |
|
720
State Street Utilities Select Sector SPDR ETF
XLU
$22.4B
| $9.89M | 0.01% |
+312,902
| New | +$10.2M |
|
|
NBIS
721
CALL
Nebius Group N.V.
NBIS
$61.5B
| $9.88M | 0.01% |
+139,600
| New | +$9.16M |
|
722
CALL
Apollo Global Management
APO
$78.9B
| $9.85M | 0.01% |
158,400
+156,680
| +9,109% | +$8.69M |
|
723
CALL
Under Armour Class C
UA
$2.2B
| $9.84M | 0.01% |
482,700
+479,039
| +13,085% | +$9.02M |
|
724
CALL
Vanguard FTSE Europe ETF
VGK
$31.1B
| $9.82M | 0.01% |
165,400
+164,710
| +23,871% | +$11.1M |
|
725
CALL
Phillips 66
PSX
$102B
| $9.79M | 0.01% |
114,100
+112,616
| +7,589% | +$9.51M |
|
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's Q2 2021 filing shows 2,248 new, 6,668 increased, 1,000 reduced and 1,196 closed positions. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M. The largest sale was Invesco QQQ Trust, an estimated $36.1M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 97% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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 2,248 new positions and closed 1,196 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.