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 | |
|---|---|---|---|---|---|---|
2426
PUT
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.9B
| $1.86M | ﹤0.01% |
67,600
+25,600
| +61% | +$557K |
|
2427
PUT
Ametek
AME
$55.5B
| $1.86M | ﹤0.01% |
11,300
+2,000
| +22% | +$305K |
|
2428
PUT
Ameriprise Financial
AMP
$46.8B
| $1.86M | ﹤0.01% |
4,900
-1,300
| -21% | -$446K |
|
2429
Murphy Oil
MUR
$5.58B
| $1.86M | ﹤0.01% |
43,643
+40,052
| +1,115% | +$1.75M |
|
2430
Alexandria Real Estate Equities
ARE
$8.88B
| $1.86M | ﹤0.01% |
+14,673
| New | +$1.58M |
|
|
MAXN
2431
PUT
DELISTED
Maxeon Solar Technologies
MAXN
| $1.86M | ﹤0.01% |
2,590
+2,368
| +1,067% | +$1.54M |
|
2432
PUT
Cooper Companies
COO
$13.7B
| $1.85M | ﹤0.01% |
19,600
+18,000
| +1,125% | +$1.51M |
|
2433
Entergy
ETR
$54.1B
| $1.85M | ﹤0.01% |
36,596
+27,768
| +315% | +$1.36M |
|
2434
State Street Industrial Select Sector SPDR ETF
XLI
$33.9B
| $1.85M | ﹤0.01% |
+16,233
| New | +$1.7M |
|
2435
CALL
East-West Bancorp
EWBC
$17.9B
| $1.85M | ﹤0.01% |
25,700
-79,300
| -76% | -$4.77M |
|
2436
CALL
Howmet Aerospace
HWM
$116B
| $1.84M | ﹤0.01% |
34,000
+14,600
| +75% | +$720K |
|
2437
Aurinia Pharmaceuticals
AUPH
$1.97B
| $1.84M | ﹤0.01% |
204,535
-17,091
| -8% | -$141K |
|
2438
State Street SPDR EURO STOXX 50 ETF
FEZ
$4.28B
| $1.83M | ﹤0.01% |
+38,373
| New | +$1.69M |
|
2439
PUT
Louisiana-Pacific
LPX
$5.2B
| $1.83M | ﹤0.01% |
25,900
-1,700
| -6% | -$102K |
|
2440
CALL
Invesco DB Commodity Index Tracking Fund
DBC
$1.73B
| $1.83M | ﹤0.01% |
83,100
+75,400
| +979% | +$1.8M |
|
2441
PUT
Shoals Technologies Group
SHLS
$1.58B
| $1.83M | ﹤0.01% |
117,700
+74,300
| +171% | +$1.12M |
|
2442
CALL
KBR
KBR
$4.68B
| $1.83M | ﹤0.01% |
33,000
-46,100
| -58% | -$2.54M |
|
2443
CALL
Mirion Technologies
MIR
$4.05B
| $1.82M | ﹤0.01% |
177,800
-86,100
| -33% | -$727K |
|
|
AKRO
2444
CALL
DELISTED
Akero Therapeutics
AKRO
| $1.82M | ﹤0.01% |
78,000
+45,900
| +143% | +$905K |
|
2445
lululemon athletica
LULU
$13B
| $1.82M | ﹤0.01% |
+3,563
| New | +$1.54M |
|
|
NKLA
2446
CALL
DELISTED
Nikola Corporation Common Stock
NKLA
| $1.82M | ﹤0.01% |
70,380
-20,937
| -23% | -$651K |
|
2447
CALL
Eldorado Gold
EGO
$8.31B
| $1.82M | ﹤0.01% |
140,300
+62,700
| +81% | +$705K |
|
2448
PUT
Lightspeed Commerce
LSPD
$1.3B
| $1.82M | ﹤0.01% |
86,700
+33,100
| +62% | +$524K |
|
2449
PUT
Teekay Tankers
TNK
$2.63B
| $1.82M | ﹤0.01% |
36,400
+20,900
| +135% | +$1M |
|
2450
CALL
Innovative Industrial Properties
IIPR
$1.78B
| $1.81M | ﹤0.01% |
18,000
-42,400
| -70% | -$3.48M |
|
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.