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 | |
|---|---|---|---|---|---|---|
2326
Paychex
PAYX
$40.4B
| $2.08M | ﹤0.01% |
17,436
-21,768
| -56% | -$2.58M |
|
2327
PUT
Yeti Holdings
YETI
$3.82B
| $2.08M | ﹤0.01% |
40,100
-22,900
| -36% | -$1.01M |
|
|
MRC
2328
PUT
DELISTED
MRC Global
MRC
| $2.07M | ﹤0.01% |
+188,300
| New | +$1.97M |
|
2329
CALL
Westlake Corp
WLK
$9.46B
| $2.07M | ﹤0.01% |
14,800
+10,200
| +222% | +$1.29M |
|
2330
CALL
Calumet Specialty Products
CLMT
$3.63B
| $2.07M | ﹤0.01% |
115,700
+60,000
| +108% | +$973K |
|
|
VTLE
2331
CALL
DELISTED
Vital Energy
VTLE
| $2.06M | ﹤0.01% |
45,400
-700
| -2% | -$33.6K |
|
2332
CALL
WEX
WEX
$6.11B
| $2.06M | ﹤0.01% |
10,600
+2,100
| +25% | +$381K |
|
2333
CALL
Red Rock Resorts
RRR
$3.74B
| $2.06M | ﹤0.01% |
38,600
+32,200
| +503% | +$1.43M |
|
|
CHGX
2334
PUT
DELISTED
AXS Change Finance ESG ETF
CHGX
| $2.05M | ﹤0.01% |
71,100
+23,000
| +48% | +$711K |
|
2335
CALL
Tandem Diabetes Care
TNDM
$1.17B
| $2.05M | ﹤0.01% |
69,400
+57,700
| +493% | +$1.2M |
|
2336
CALL
Century Aluminum
CENX
$4.57B
| $2.05M | ﹤0.01% |
169,000
+101,500
| +150% | +$796K |
|
2337
CALL
Aehr Test Systems
AEHR
$2.48B
| $2.05M | ﹤0.01% |
77,300
+35,100
| +83% | +$1.02M |
|
2338
CALL
Icahn Enterprises
IEP
$5.17B
| $2.05M | ﹤0.01% |
119,200
-49,300
| -29% | -$863K |
|
2339
Macy's
M
$6.15B
| $2.05M | ﹤0.01% |
101,690
-299,772
| -75% | -$4.34M |
|
2340
CALL
Weyerhaeuser
WY
$17.3B
| $2.04M | ﹤0.01% |
58,800
-17,300
| -23% | -$538K |
|
2341
PUT
Uranium Energy
UEC
$4.71B
| $2.04M | ﹤0.01% |
319,300
+168,700
| +112% | +$1.01M |
|
2342
PUT
Royal Gold
RGLD
$17.1B
| $2.03M | ﹤0.01% |
16,800
+12,000
| +250% | +$1.36M |
|
2343
CALL
Semtech
SMTC
$11.7B
| $2.03M | ﹤0.01% |
92,700
-13,700
| -13% | -$254K |
|
2344
CALL
U-Haul Holding Co Series N
UHAL.B
$12.2B
| $2.03M | ﹤0.01% |
28,300
+25,600
| +948% | +$1.39M |
|
|
PPLI
2345
CALL
People Inc
PPLI
$3.1B
| $2.02M | ﹤0.01% |
47,053
+35,960
| +324% | +$1.41M |
|
2346
CALL
Equity Residential
EQR
$25.4B
| $2.02M | ﹤0.01% |
33,000
+15,500
| +89% | +$897K |
|
|
MDRX
2347
PUT
DELISTED
Veradigm Inc. Common Stock
MDRX
| $2.02M | ﹤0.01% |
+192,400
| New | +$2.36M |
|
2348
PUT
Omega Healthcare
OHI
$15.4B
| $2.02M | ﹤0.01% |
65,800
+36,000
| +121% | +$1.16M |
|
2349
CALL
Bright Horizons
BFAM
$3.99B
| $2.02M | ﹤0.01% |
21,400
-10,000
| -32% | -$853K |
|
2350
CALL
Amplify Junior Silver Miners ETF
SILJ
$3.27B
| $2.02M | ﹤0.01% |
211,000
+27,800
| +15% | +$251K |
|
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.