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 | |
|---|---|---|---|---|---|---|
1176
PUT
Sony
SONY
$123B
| $6.45M | 0.01% |
391,500
+115,000
| +42% | +$2.01M |
|
1177
PUT
Baxter International
BAX
$11.5B
| $6.44M | 0.01% |
170,600
-68,000
| -28% | -$2.9M |
|
1178
Regeneron Pharmaceuticals
REGN
$69.2B
| $6.42M | 0.01% |
7,807
+990
| +15% | +$778K |
|
|
SHNY
1179
PUT
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $6.42M | 0.01% |
360,100
-3,900
| -1% | -$69.6K |
|
1180
PUT
Fastly Inc
FSLY
$3.08B
| $6.42M | 0.01% |
334,800
+17,500
| +6% | +$341K |
|
1181
CALL
Welltower
WELL
$177B
| $6.41M | 0.01% |
78,300
+11,300
| +17% | +$929K |
|
1182
CALL
GE HealthCare
GEHC
$27.7B
| $6.41M | 0.01% |
94,200
+41,500
| +79% | +$3.02M |
|
1183
CALL
United States Natural Gas Fund
UNG
$477M
| $6.41M | 0.01% |
234,600
-119,800
| -34% | -$3.35M |
|
1184
PUT
Sprott Junior Uranium Miners ETF
URNJ
$309M
| $6.39M | 0.01% |
137,900
+128,500
| +1,367% | +$2.43M |
|
1185
CALL
Federal Agricultural Mortgage Class A
AGM.A
$1.61B
| $6.37M | 0.01% |
41,300
+41,200
| +41,200% | +$5.54M |
|
1186
PUT
Build-A-Bear
BBW
$424M
| $6.36M | 0.01% |
216,200
+199,200
| +1,172% | +$5.04M |
|
1187
Fortinet
FTNT
$112B
| $6.36M | 0.01% |
108,344
+105,194
| +3,339% | +$6.96M |
|
1188
PUT
Abercrombie & Fitch
ANF
$4.1B
| $6.35M | 0.01% |
112,700
+42,500
| +61% | +$1.89M |
|
1189
PUT
UBS Group
UBS
$169B
| $6.34M | 0.01% |
257,300
-37,400
| -13% | -$874K |
|
1190
PUT
TKO Group
TKO
$13.6B
| $6.32M | 0.01% |
+75,200
| New | +$6.98M |
|
|
SWAV
1191
CALL
DELISTED
Shockwave Medical, Inc. Common Stock
SWAV
| $6.31M | 0.01% |
31,700
+4,900
| +18% | +$1.16M |
|
1192
PUT
Vistra
VST
$56.6B
| $6.31M | 0.01% |
190,100
-1,900
| -1% | -$57.1K |
|
1193
PUT
Samsara
IOT
$18.8B
| $6.3M | 0.01% |
250,100
+138,600
| +124% | +$3.68M |
|
1194
CALL
Gold Fields
GFI
$29.1B
| $6.29M | ﹤0.01% |
579,200
-60,900
| -10% | -$803K |
|
1195
iShares iBoxx $ Investment Grade Corporate Bond ETF
LQD
$34.7B
| $6.27M | ﹤0.01% |
61,474
+47,684
| +346% | +$5.03M |
|
1196
CALL
Alamos Gold
AGI
$12.4B
| $6.25M | ﹤0.01% |
553,800
+192,400
| +53% | +$2.31M |
|
1197
PUT
Public Storage
PSA
$59.6B
| $6.25M | ﹤0.01% |
23,700
+10,200
| +76% | +$2.86M |
|
1198
PUT
Enovix
ENVX
$890M
| $6.21M | ﹤0.01% |
565,486
-212,800
| -27% | -$3.04M |
|
1199
PUT
argenx
ARGX
$57.8B
| $6.19M | ﹤0.01% |
12,600
+500
| +4% | +$245K |
|
1200
PUT
LPL Financial
LPLA
$25.9B
| $6.18M | ﹤0.01% |
26,000
+18,000
| +225% | +$4.18M |
|
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.