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 | |
|---|---|---|---|---|---|---|
876
PUT
Allegro MicroSystems
ALGM
$9.33B
| $11.1M | 0.01% |
346,500
+41,600
| +14% | +$1.69M |
|
877
PUT
Becton Dickinson
BDX
$42.1B
| $11.1M | 0.01% |
42,800
+21,500
| +101% | +$5.81M |
|
|
FITB
878
CALL
Fifth Third Bancorp
FITB
$51.8B
| $11M | 0.01% |
434,700
-40,400
| -9% | -$1.09M |
|
879
PUT
Duolingo
DUOL
$5.62B
| $11M | 0.01% |
66,200
+6,800
| +11% | +$1M |
|
880
CALL
American Electric Power
AEP
$73.4B
| $10.9M | 0.01% |
145,300
+29,800
| +26% | +$2.42M |
|
881
CALL
UiPath
PATH
$5.28B
| $10.9M | 0.01% |
637,200
+223,700
| +54% | +$3.73M |
|
882
CALL
Intercontinental Exchange
ICE
$81B
| $10.9M | 0.01% |
138,800
+110,600
| +392% | +$12.7M |
|
883
CALL
iShares Convertible Bond ETF
ICVT
$7.37B
| $10.9M | 0.01% |
346,200
+269,600
| +352% | +$20.5M |
|
884
PUT
Kroger
KR
$34.2B
| $10.9M | 0.01% |
242,700
-50,800
| -17% | -$2.39M |
|
885
PUT
Equinix
EQIX
$102B
| $10.8M | 0.01% |
14,900
-1,700
| -10% | -$1.32M |
|
886
PUT
Advance Auto Parts
AAP
$3.22B
| $10.8M | 0.01% |
193,200
+46,100
| +31% | +$3.09M |
|
887
Northrop Grumman
NOC
$75.8B
| $10.8M | 0.01% |
24,516
+17,753
| +263% | +$7.8M |
|
888
CALL
Martin Marietta Materials
MLM
$32.8B
| $10.8M | 0.01% |
26,200
-10,300
| -28% | -$4.55M |
|
889
CALL
LyondellBasell Industries
LYB
$19.9B
| $10.7M | 0.01% |
113,500
+27,200
| +32% | +$2.61M |
|
890
CALL
Zions Bancorporation
ZION
$10.1B
| $10.7M | 0.01% |
307,300
-64,300
| -17% | -$2.24M |
|
891
PUT
Ferrari
RACE
$63.2B
| $10.7M | 0.01% |
36,100
+21,800
| +152% | +$6.77M |
|
892
CALL
MPLX
MPLX
$58.4B
| $10.7M | 0.01% |
299,900
+51,500
| +21% | +$1.8M |
|
893
PUT
Cleveland-Cliffs
CLF
$6.25B
| $10.7M | 0.01% |
682,400
-197,400
| -22% | -$3.08M |
|
894
CALL
Ovintiv
OVV
$17.3B
| $10.7M | 0.01% |
224,100
+45,500
| +25% | +$2.06M |
|
895
CALL
Quest Diagnostics
DGX
$25.2B
| $10.7M | 0.01% |
87,400
+47,700
| +120% | +$6.36M |
|
896
CALL
Macy's
M
$6.14B
| $10.6M | 0.01% |
915,000
+535,500
| +141% | +$7.5M |
|
897
PUT
Target Hospitality
TH
$1.63B
| $10.6M | 0.01% |
669,000
-86,800
| -11% | -$1.22M |
|
898
CALL
Teleflex
TFX
$5.81B
| $10.6M | 0.01% |
54,000
+15,000
| +38% | +$3.4M |
|
899
Bristol-Myers Squibb
BMY
$126B
| $10.6M | 0.01% |
182,593
+93,234
| +104% | +$5.71M |
|
900
PUT
Akamai
AKAM
$17.1B
| $10.5M | 0.01% |
99,000
-137,300
| -58% | -$13.7M |
|
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.