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 | |
|---|---|---|---|---|---|---|
4126
PUT
Santander
BSBR
$38.8B
| $248K | ﹤0.01% |
48,400
+46,500
| +2,447% | +$263K |
|
4127
CALL
DT Midstream
DTM
$14B
| $248K | ﹤0.01% |
4,700
-7,300
| -61% | -$381K |
|
4128
PUT
Gerdau
GGB
$9.72B
| $248K | ﹤0.01% |
62,640
-4,920
| -7% | -$21.9K |
|
4129
PUT
Honda
HMC
$40.3B
| $248K | ﹤0.01% |
7,400
-59,400
| -89% | -$1.91M |
|
|
MITT
4130
PUT
TPG Mortgage Investment Trust
MITT
$231M
| $248K | ﹤0.01% |
44,800
+500
| +1% | +$3.17K |
|
4131
CALL
Champion Homes
SKY
$4.51B
| $248K | ﹤0.01% |
3,900
+1,000
| +34% | +$67.1K |
|
4132
PUT
Mirum Pharmaceuticals
MIRM
$6.73B
| $246K | ﹤0.01% |
7,800
+1,600
| +26% | +$43.8K |
|
|
RC
4133
PUT
Ready Capital
RC
$265M
| $246K | ﹤0.01% |
24,400
-100
| -0.4% | -$1.1K |
|
4134
CALL
Root
ROOT
$916M
| $246K | ﹤0.01% |
25,900
-20,600
| -44% | -$213K |
|
|
SVC
4135
PUT
Service Properties Trust
SVC
$1.08B
| $246K | ﹤0.01% |
6,400
+520
| +9% | +$21.6K |
|
4136
CALL
Teekay
TK
$1B
| $246K | ﹤0.01% |
40,000
-69,900
| -64% | -$446K |
|
|
BECN
4137
PUT
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $246K | ﹤0.01% |
3,200
-900
| -22% | -$72.7K |
|
4138
CALL
Ambev
ABEV
$47.7B
| $245K | ﹤0.01% |
95,200
-24,800
| -21% | -$71.7K |
|
4139
PUT
Element Solutions
ESI
$8.67B
| $245K | ﹤0.01% |
12,500
+6,800
| +119% | +$135K |
|
4140
CALL
Evolent Health
EVH
$391M
| $245K | ﹤0.01% |
9,000
+6,600
| +275% | +$183K |
|
4141
ProShares Short Russell2000
RWM
$131M
| $245K | ﹤0.01% |
10,147
+155
| +2% | +$3.55K |
|
4142
PUT
Zumiez
ZUMZ
$331M
| $245K | ﹤0.01% |
13,800
+13,500
| +4,500% | +$243K |
|
4143
PUT
Assurant
AIZ
$14.1B
| $244K | ﹤0.01% |
1,700
+1,000
| +143% | +$137K |
|
4144
PUT
Vanguard Total Bond Market
BND
$158B
| $244K | ﹤0.01% |
3,500
+400
| +13% | +$28.6K |
|
4145
PUT
Federal Realty Investment Trust
FRT
$10.9B
| $244K | ﹤0.01% |
2,700
-1,700
| -39% | -$168K |
|
4146
CALL
G-III Apparel Group
GIII
$1.55B
| $244K | ﹤0.01% |
9,800
-51,200
| -84% | -$1.09M |
|
4147
CALL
McEwen Inc
MUX
$1.03B
| $244K | ﹤0.01% |
37,600
-9,600
| -20% | -$72.4K |
|
4148
PUT
Extra Space Storage
EXR
$32.8B
| $243K | ﹤0.01% |
2,000
+1,900
| +1,900% | +$255K |
|
4149
Nokia
NOK
$48.5B
| $243K | ﹤0.01% |
65,110
-3,700
| -5% | -$14.6K |
|
4150
CALL
Phinia Inc
PHIN
$3.03B
| $243K | ﹤0.01% |
+9,100
| New | +$252K |
|
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.