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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3051
CALL
Sterling Infrastructure
STRL
$20.3B
| $949K | ﹤0.01% |
10,800
-3,600
| -25% | -$260K |
|
3052
PUT
Ericsson
ERIC
$30.7B
| $948K | ﹤0.01% |
150,500
-43,300
| -22% | -$219K |
|
3053
CALL
Onto Innovation
ONTO
$13.6B
| $947K | ﹤0.01% |
6,200
+400
| +7% | +$53.8K |
|
3054
PUT
Plains All American Pipeline
PAA
$17.4B
| $946K | ﹤0.01% |
62,500
-105,500
| -63% | -$1.61M |
|
3055
CALL
Globalstar
GSAT
$10.2B
| $944K | ﹤0.01% |
32,467
+18,640
| +135% | +$410K |
|
|
NVRO
3056
CALL
DELISTED
NEVRO CORP.
NVRO
| $942K | ﹤0.01% |
43,800
-21,300
| -33% | -$380K |
|
3057
PUT
Aehr Test Systems
AEHR
$2.48B
| $941K | ﹤0.01% |
35,500
-10,200
| -22% | -$298K |
|
3058
CALL
Leidos
LDOS
$14.1B
| $941K | ﹤0.01% |
8,700
+300
| +4% | +$30.6K |
|
3059
TransDigm Group
TDG
$69.2B
| $941K | ﹤0.01% |
931
-1,630
| -64% | -$1.5M |
|
3060
CALL
Bakkt Inc
BKKT
$333M
| $940K | ﹤0.01% |
16,872
+11,396
| +208% | +$395K |
|
3061
ProShares Short Bitcoin Strategy ETF
BITI
$118M
| $939K | ﹤0.01% |
+14,290
| New | +$1.14M |
|
3062
Schwab Short-Term US Treasury ETF
SCHO
$12.7B
| $939K | ﹤0.01% |
+38,800
| New | +$932K |
|
3063
Eastman Chemical
EMN
$7.8B
| $938K | ﹤0.01% |
10,452
+10,377
| +13,836% | +$827K |
|
3064
State Street SPDR Portfolio S&P 1500 Composite Stock Market ETF
SPTM
$13.5B
| $936K | ﹤0.01% |
+16,024
| New | +$875K |
|
3065
Macerich
MAC
$7.32B
| $935K | ﹤0.01% |
60,652
+12,736
| +27% | +$152K |
|
3066
Winnebago Industries
WGO
$870M
| $934K | ﹤0.01% |
12,821
+7,596
| +145% | +$487K |
|
3067
CALL
LPL Financial
LPLA
$26.3B
| $933K | ﹤0.01% |
4,100
-15,400
| -79% | -$3.46M |
|
|
MCW
3068
CALL
DELISTED
Mister Car Wash
MCW
| $933K | ﹤0.01% |
108,100
+57,800
| +115% | +$392K |
|
3069
PUT
Digital Turbine
APPS
$1.02B
| $932K | ﹤0.01% |
136,000
+108,500
| +395% | +$606K |
|
3070
CALL
Polestar Automotive Holding UK
PSNY
$1.98B
| $932K | ﹤0.01% |
13,757
-6
| -0% | -$418 |
|
3071
CALL
Atlas Energy Solutions
AESI
$1.49B
| $931K | ﹤0.01% |
54,100
+32,600
| +152% | +$600K |
|
3072
PUT
HEICO Corp Class A
HEI.A
$35.4B
| $930K | ﹤0.01% |
5,200
-5,000
| -49% | -$677K |
|
3073
PUT
Alcon
ALC
$33.1B
| $929K | ﹤0.01% |
11,900
+3,400
| +40% | +$251K |
|
3074
CALL
Western Union
WU
$2.57B
| $928K | ﹤0.01% |
77,900
+16,600
| +27% | +$203K |
|
3075
CALL
Mid-America Apartment Communities
MAA
$15.6B
| $927K | ﹤0.01% |
6,900
-300
| -4% | -$38.1K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.