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 | |
|---|---|---|---|---|---|---|
4601
ArcBest
ARCB
$3.15B
| $216K | ﹤0.01% |
1,803
-4,726
| -72% | -$524K |
|
4602
PUT
Armstrong World Industries
AWI
$7.37B
| $216K | ﹤0.01% |
+2,200
| New | +$182K |
|
|
HPP
4603
PUT
Hudson Pacific Properties
HPP
$758M
| $216K | ﹤0.01% |
3,329
+1,886
| +131% | +$83.2K |
|
4604
Host Hotels & Resorts
HST
$17.5B
| $216K | ﹤0.01% |
11,111
-5,155
| -32% | -$88.4K |
|
4605
CALL
John B. Sanfilippo & Son
JBSS
$986M
| $216K | ﹤0.01% |
2,100
-4,400
| -68% | -$432K |
|
4606
Kohl's
KSS
$2.16B
| $215K | ﹤0.01% |
+7,502
| New | +$176K |
|
4607
Direxion Daily MSCI Mexico Bull 3X ETF
MEXX
$18.9M
| $215K | ﹤0.01% |
6,129
+3,466
| +130% | +$87K |
|
4608
Phinia Inc
PHIN
$3.04B
| $215K | ﹤0.01% |
7,124
+3,247
| +84% | +$87.1K |
|
4609
CALL
Vanguard S&P 500 Growth ETF
VOOG
$24.7B
| $215K | ﹤0.01% |
6,600
-53,400
| -89% | -$2.29M |
|
4610
CALL
VistaGen Therapeutics
VTGN
$9.98M
| $215K | ﹤0.01% |
42,900
+34,300
| +399% | +$130K |
|
4611
CALL
Arbutus Biopharma
ABUS
$847M
| $214K | ﹤0.01% |
85,600
-3,900
| -4% | -$7.64K |
|
4612
PUT
Ascendis Pharma A/S
ASND
$16.5B
| $214K | ﹤0.01% |
1,700
-1,700
| -50% | -$169K |
|
4613
PC Connection
CNXN
$2.09B
| $214K | ﹤0.01% |
+3,189
| New | +$190K |
|
4614
PUT
United States Copper Index Fund
CPER
$742M
| $214K | ﹤0.01% |
8,900
-43,700
| -83% | -$1.01M |
|
|
DESP
4615
CALL
DELISTED
Despegar.com
DESP
| $214K | ﹤0.01% |
22,700
+22,200
| +4,440% | +$171K |
|
4616
PUT
Opko Health
OPK
$1.02B
| $214K | ﹤0.01% |
142,300
-1,100
| -0.8% | -$1.59K |
|
4617
CALL
StoneX
SNEX
$8.72B
| $214K | ﹤0.01% |
+9,788
| New | +$186K |
|
4618
PUT
American Coastal Insurance
ACIC
$536M
| $213K | ﹤0.01% |
22,600
-2,100
| -9% | -$16.9K |
|
4619
PUT
Atlas Energy Solutions
AESI
$1.27B
| $213K | ﹤0.01% |
12,400
+9,700
| +359% | +$179K |
|
|
BRAG
4620
Bragg Gaming Group
BRAG
$42.2M
| $213K | ﹤0.01% |
42,219
+13,192
| +45% | +$63.8K |
|
4621
Church & Dwight Co
CHD
$23.7B
| $213K | ﹤0.01% |
2,254
+1,158
| +106% | +$106K |
|
4622
PUT
LCI Industries
LCII
$2.59B
| $213K | ﹤0.01% |
1,700
-2,400
| -59% | -$276K |
|
|
CALY
4623
Callaway Golf Company
CALY
$3.28B
| $213K | ﹤0.01% |
14,886
-27,287
| -65% | -$351K |
|
4624
CALL
Patterson-UTI
PTEN
$3.54B
| $213K | ﹤0.01% |
19,800
-37,100
| -65% | -$451K |
|
|
B
4625
DELISTED
Barnes Group Inc.
B
| $213K | ﹤0.01% |
6,543
+5,139
| +366% | +$147K |
|
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.