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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
851
Strategy Inc
MSTR
$34.2B
| $11.6M | 0.01% |
354,510
+109,270
| +45% | +$4.11M |
|
852
PUT
Teva Pharmaceuticals
TEVA
$36.3B
| $11.6M | 0.01% |
1,135,200
-341,600
| -23% | -$3.18M |
|
853
PUT
ProShares Ultra S&P500
SSO
$7.82B
| $11.6M | 0.01% |
419,000
+248,600
| +146% | +$7.22M |
|
854
PUT
Clorox
CLX
$11.3B
| $11.6M | 0.01% |
88,300
+28,300
| +47% | +$4.3M |
|
855
Check Point Software Technologies
CHKP
$13.1B
| $11.6M | 0.01% |
86,753
+15,833
| +22% | +$2.08M |
|
856
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$294M
| $11.5M | 0.01% |
294,045
+276,401
| +1,567% | +$9.33M |
|
857
PUT
TJX Companies
TJX
$170B
| $11.5M | 0.01% |
129,400
+5,200
| +4% | +$458K |
|
858
CALL
Zebra Technologies
ZBRA
$12.2B
| $11.5M | 0.01% |
48,600
-14,400
| -23% | -$3.91M |
|
859
CALL
Silicon Motion
SIMO
$9.8B
| $11.5M | 0.01% |
223,500
+83,100
| +59% | +$4.73M |
|
860
PUT
Boston Properties
BXP
$10.8B
| $11.4M | 0.01% |
192,100
-67,600
| -26% | -$4.33M |
|
861
PUT
Electronic Arts
EA
$52.4B
| $11.4M | 0.01% |
94,700
+8,200
| +9% | +$1.03M |
|
862
CALL
GitLab
GTLB
$5.1B
| $11.4M | 0.01% |
252,100
+125,600
| +99% | +$6.01M |
|
863
CALL
Five Below
FIVE
$11.1B
| $11.4M | 0.01% |
70,600
+29,300
| +71% | +$5.36M |
|
864
CALL
M&T Bank
MTB
$35.6B
| $11.3M | 0.01% |
89,200
-30,700
| -26% | -$4M |
|
865
Ford
F
$56.4B
| $11.3M | 0.01% |
907,789
-337,757
| -27% | -$4.39M |
|
866
CALL
Cadence Design Systems
CDNS
$91.1B
| $11.3M | 0.01% |
48,100
-5,200
| -10% | -$1.22M |
|
867
CALL
Hershey
HSY
$34.9B
| $11.2M | 0.01% |
56,100
+16,600
| +42% | +$3.72M |
|
868
Waste Management
WM
$95.3B
| $11.2M | 0.01% |
73,591
+63,627
| +639% | +$10.3M |
|
869
PUT
Realty Income
O
$60.4B
| $11.2M | 0.01% |
224,200
+117,800
| +111% | +$6.77M |
|
870
American Tower
AMT
$76.7B
| $11.2M | 0.01% |
+67,954
| New | +$12.4M |
|
871
CALL
Unilever
UL
$130B
| $11.2M | 0.01% |
201,067
-16,977
| -8% | -$981K |
|
872
PUT
Invesco DB US Dollar Index Bullish Fund
UUP
$434M
| $11.1M | 0.01% |
430,200
-37,900
| -8% | -$1.09M |
|
|
DENT
873
CALL
DELISTED
AdvisorShares Dent Tactical ETF
DENT
| $11.1M | 0.01% |
1,404,900
+945,400
| +206% | +$7.48M |
|
874
PUT
XPO
XPO
$25.1B
| $11.1M | 0.01% |
154,200
+104,000
| +207% | +$7.18M |
|
875
PUT
Southern Company
SO
$109B
| $11.1M | 0.01% |
171,300
+105,500
| +160% | +$7.32M |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.