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 | |
|---|---|---|---|---|---|---|
2826
CALL
FS KKR Capital
FSK
$2.98B
| $860K | ﹤0.01% |
43,700
-60,300
| -58% | -$1.21M |
|
2827
PUT
MoonLake Immunotherapeutics
MLTX
$1.59B
| $860K | ﹤0.01% |
+15,100
| New | +$834K |
|
|
HTGCR
2828
PUT
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $858K | ﹤0.01% |
52,300
-102,800
| -66% | -$1.69M |
|
2829
CALL
Guardant Health
GH
$19.5B
| $856K | ﹤0.01% |
28,900
-500
| -2% | -$17.6K |
|
2830
CALL
Kanzhun
BZ
$6.89B
| $855K | ﹤0.01% |
56,400
+37,400
| +197% | +$587K |
|
2831
CALL
Clover Health Investments
CLOV
$2.28B
| $855K | ﹤0.01% |
792,200
+43,900
| +6% | +$52.2K |
|
2832
PUT
First Horizon
FHN
$12.1B
| $855K | ﹤0.01% |
77,600
-116,500
| -60% | -$1.44M |
|
2833
CALL
LGI Homes
LGIH
$1.4B
| $855K | ﹤0.01% |
8,600
+3,600
| +72% | +$447K |
|
|
CEQP
2834
CALL
DELISTED
Crestwood Equity Partners LP
CEQP
| $854K | ﹤0.01% |
29,200
-15,800
| -35% | -$443K |
|
2835
CALL
FTAI Aviation
FTAI
$22.2B
| $853K | ﹤0.01% |
24,000
-48,600
| -67% | -$1.67M |
|
|
INFA
2836
CALL
DELISTED
Informatica
INFA
| $853K | ﹤0.01% |
40,500
+38,400
| +1,829% | +$766K |
|
2837
TC Energy
TRP
$73.5B
| $853K | ﹤0.01% |
+24,802
| New | +$913K |
|
2838
PUT
Alaska Air
ALK
$5.15B
| $852K | ﹤0.01% |
23,000
-135,100
| -85% | -$6.12M |
|
2839
CALL
ING
ING
$93.8B
| $852K | ﹤0.01% |
64,700
-67,100
| -51% | -$945K |
|
2840
Coupang
CPNG
$27.8B
| $851K | ﹤0.01% |
50,086
-23,626
| -32% | -$425K |
|
2841
PUT
Lattice Semiconductor
LSCC
$17.6B
| $850K | ﹤0.01% |
9,900
-2,900
| -23% | -$262K |
|
|
CHS
2842
CALL
DELISTED
Chicos FAS, Inc.
CHS
| $850K | ﹤0.01% |
113,700
+23,800
| +26% | +$128K |
|
2843
CALL
Arrowhead Research
ARWR
$12.1B
| $849K | ﹤0.01% |
31,600
+16,900
| +115% | +$518K |
|
2844
CALL
Blink Charging
BLNK
$75.2M
| $848K | ﹤0.01% |
277,400
-132,700
| -32% | -$667K |
|
2845
CALL
Graphic Packaging
GPK
$3.26B
| $848K | ﹤0.01% |
38,100
-28,600
| -43% | -$656K |
|
|
WE
2846
CALL
DELISTED
WeWork Inc.
WE
| $847K | ﹤0.01% |
281,700
+277,907
| +7,327% | +$1.91M |
|
2847
CALL
Uranium Energy
UEC
$4.71B
| $845K | ﹤0.01% |
164,200
+78,700
| +92% | +$321K |
|
2848
PUT
New York Times
NYT
$11.6B
| $844K | ﹤0.01% |
20,500
+1,800
| +10% | +$75.7K |
|
|
AZPN
2849
DELISTED
Aspen Technology Inc
AZPN
| $844K | ﹤0.01% |
+4,132
| New | +$778K |
|
|
2850
PUT
FTAI Aviation
FTAI
$22.2B
| $842K | ﹤0.01% |
23,700
-68,900
| -74% | -$2.37M |
|
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.