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 | |
|---|---|---|---|---|---|---|
926
CALL
Ally Financial
ALLY
$13.4B
| $10M | 0.01% |
375,200
-178,300
| -32% | -$4.98M |
|
927
CALL
Coupang
CPNG
$28.1B
| $9.99M | 0.01% |
587,800
+354,700
| +152% | +$6.38M |
|
928
CALL
BCE
BCE
$19.8B
| $9.97M | 0.01% |
261,100
+142,000
| +119% | +$5.96M |
|
929
CALL
NetApp
NTAP
$32.3B
| $9.93M | 0.01% |
130,900
-47,100
| -26% | -$3.64M |
|
930
CALL
Quanta Services
PWR
$98.1B
| $9.91M | 0.01% |
53,000
-2,400
| -4% | -$481K |
|
931
CALL
Fidelity National Information Services
FIS
$20.7B
| $9.9M | 0.01% |
179,200
-151,700
| -46% | -$8.73M |
|
|
BNY
932
PUT
Bank of New York Mellon
BNY
$109B
| $9.89M | 0.01% |
231,800
+92,700
| +67% | +$4.13M |
|
933
PUT
Carrier Global
CARR
$57.4B
| $9.88M | 0.01% |
179,000
+110,500
| +161% | +$6.08M |
|
|
SKX
934
PUT
DELISTED
Skechers
SKX
| $9.86M | 0.01% |
201,500
-146,500
| -42% | -$7.49M |
|
935
PUT
eBay
EBAY
$48.5B
| $9.83M | 0.01% |
223,000
-48,500
| -18% | -$2.16M |
|
936
PUT
Alnylam Pharmaceuticals
ALNY
$35.9B
| $9.83M | 0.01% |
55,500
+18,700
| +51% | +$3.57M |
|
937
CALL
SentinelOne
S
$5.96B
| $9.79M | 0.01% |
580,700
-67,900
| -10% | -$1.07M |
|
938
PUT
M&T Bank
MTB
$35.6B
| $9.76M | 0.01% |
77,200
-41,900
| -35% | -$5.47M |
|
939
CALL
International Flavors & Fragrances
IFF
$18.8B
| $9.73M | 0.01% |
142,800
-14,200
| -9% | -$1.04M |
|
940
Halliburton
HAL
$27.3B
| $9.71M | 0.01% |
+239,802
| New | +$9.39M |
|
941
PUT
HubSpot
HUBS
$9.73B
| $9.7M | 0.01% |
19,700
+200
| +1% | +$104K |
|
942
CALL
Target Hospitality
TH
$1.63B
| $9.7M | 0.01% |
610,900
+514,700
| +535% | +$7.26M |
|
943
Diamondback Energy
FANG
$57.8B
| $9.64M | 0.01% |
62,249
+60,279
| +3,060% | +$8.9M |
|
944
CALL
PBF Energy
PBF
$7.33B
| $9.62M | 0.01% |
179,700
+65,800
| +58% | +$3.13M |
|
945
CALL
XPO
XPO
$25.1B
| $9.59M | 0.01% |
134,100
+21,200
| +19% | +$1.46M |
|
946
CALL
Aon
AON
$76B
| $9.56M | 0.01% |
29,500
+5,800
| +24% | +$1.92M |
|
947
PUT
iShares Core MSCI Emerging Markets ETF
IEMG
$152B
| $9.52M | 0.01% |
166,100
-108,000
| -39% | -$5.34M |
|
948
PUT
Bunge Global
BG
$23.7B
| $9.47M | 0.01% |
87,500
+33,000
| +61% | +$3.62M |
|
|
949
PUT
International Flavors & Fragrances
IFF
$18.8B
| $9.46M | 0.01% |
138,800
+19,900
| +17% | +$1.45M |
|
950
PUT
Kimberly-Clark
KMB
$35.6B
| $9.44M | 0.01% |
78,100
+37,600
| +93% | +$4.86M |
|
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.