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 | |
|---|---|---|---|---|---|---|
751
PUT
ArcelorMittal
MT
$49.9B
| $9.34M | 0.01% |
300,700
+298,610
| +14,288% | +$9.24M |
|
752
CALL
C3.ai
AI
$1.27B
| $9.34M | 0.01% |
149,300
+147,867
| +10,319% | +$9.19M |
|
|
NKLA
753
CALL
DELISTED
Nikola Corporation Common Stock
NKLA
| $9.29M | 0.01% |
17,153
+17,022
| +12,994% | +$7.09M |
|
754
CALL
Amplify Junior Silver Miners ETF
SILJ
$3.28B
| $9.26M | 0.01% |
466,300
+458,999
| +6,287% | +$7.45M |
|
755
PUT
Microchip Technology
MCHP
$44.2B
| $9.25M | 0.01% |
+123,600
| New | +$9.42M |
|
756
PUT
Bausch Health
BHC
$1.66B
| $9.21M | 0.01% |
+314,000
| New | +$9.51M |
|
757
PUT
HCA Healthcare
HCA
$83.5B
| $9.2M | 0.01% |
44,500
+44,118
| +11,549% | +$8.99M |
|
758
Fastly Inc
FSLY
$3.04B
| $9.19M | 0.01% |
154,216
+143,409
| +1,327% | +$8.15M |
|
759
CALL
EOG Resources
EOG
$77.5B
| $9.17M | 0.01% |
109,900
+108,634
| +8,581% | +$8.59M |
|
760
CALL
Proshares UltraShort Technology
REW
$3.37M
| $9.15M | 0.01% |
44,981
+43,459
| +2,855% | +$7.68M |
|
761
CALL
Coupang
CPNG
$28.1B
| $9.13M | 0.01% |
218,400
+216,718
| +12,885% | +$8.87M |
|
762
PUT
ProShares UltraShort Health Care
RXD
$3.3M
| $9.11M | 0.01% |
253,750
+253,003
| +33,869% | +$8.08M |
|
763
CALL
Linde
LIN
$234B
| $9.11M | 0.01% |
31,500
+31,225
| +11,355% | +$9.1M |
|
764
CALL
Marriott International
MAR
$96.1B
| $9.09M | 0.01% |
66,600
+65,660
| +6,985% | +$9.47M |
|
765
TAL Education Group
TAL
$5.74B
| $9.07M | 0.01% |
359,494
+313,358
| +679% | +$14M |
|
766
CALL
TJX Companies
TJX
$170B
| $9.06M | 0.01% |
134,400
+132,031
| +5,573% | +$9M |
|
767
PUT
AutoNation
AN
$6.86B
| $9.05M | 0.01% |
95,500
+94,546
| +9,910% | +$9.26M |
|
768
CALL
Nutanix
NTNX
$14.2B
| $9.05M | 0.01% |
236,700
+234,832
| +12,571% | +$7.32M |
|
769
Pinduoduo
PDD
$119B
| $8.98M | 0.01% |
70,713
-65,960
| -48% | -$8.57M |
|
770
PUT
Louisiana-Pacific
LPX
$5.04B
| $8.97M | 0.01% |
148,800
+148,736
| +232,400% | +$9.51M |
|
771
PUT
Teck Resources
TECK
$29.3B
| $8.96M | 0.01% |
389,100
+387,018
| +18,589% | +$8.8M |
|
772
CALL
Align Technology
ALGN
$12B
| $8.92M | 0.01% |
+14,600
| New | +$8.64M |
|
773
CALL
FirstEnergy
FE
$28.6B
| $8.92M | 0.01% |
239,700
+237,542
| +11,008% | +$8.83M |
|
774
CALL
Allstate
ALL
$65.5B
| $8.91M | 0.01% |
68,300
+67,618
| +9,915% | +$8.74M |
|
775
PUT
XPO
XPO
$25.1B
| $8.9M | 0.01% |
+183,893
| New | +$8.98M |
|
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.