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 | |
|---|---|---|---|---|---|---|
1401
CALL
Rambus
RMBS
$10.4B
| $6.15M | ﹤0.01% |
90,100
-53,800
| -37% | -$3.35M |
|
1402
PUT
GE HealthCare
GEHC
$27.9B
| $6.15M | ﹤0.01% |
79,500
-41,300
| -34% | -$2.89M |
|
1403
Regeneron Pharmaceuticals
REGN
$69.1B
| $6.13M | ﹤0.01% |
6,984
-823
| -11% | -$678K |
|
1404
CALL
JB Hunt Transport Services
JBHT
$27.3B
| $6.13M | ﹤0.01% |
30,700
-14,900
| -33% | -$2.76M |
|
1405
PUT
Quest Diagnostics
DGX
$25.4B
| $6.12M | ﹤0.01% |
44,400
+36,800
| +484% | +$4.84M |
|
1406
PUT
AerCap
AER
$23.9B
| $6.12M | ﹤0.01% |
82,300
+77,600
| +1,651% | +$5.12M |
|
1407
PUT
IonQ
IONQ
$12.3B
| $6.11M | ﹤0.01% |
493,400
-36,700
| -7% | -$473K |
|
1408
PUT
DTE Energy
DTE
$31B
| $6.1M | ﹤0.01% |
55,300
-5,600
| -9% | -$574K |
|
1409
CALL
Reliance Steel & Aluminium
RS
$20.9B
| $6.1M | ﹤0.01% |
21,800
+20,000
| +1,111% | +$5.31M |
|
1410
CALL
Cooper Companies
COO
$13.8B
| $6.09M | ﹤0.01% |
64,400
-5,600
| -8% | -$470K |
|
1411
CALL
STMicroelectronics
STM
$46B
| $6.08M | ﹤0.01% |
121,400
+49,900
| +70% | +$2.23M |
|
1412
iShares MBS ETF
MBB
$39B
| $6.08M | ﹤0.01% |
64,585
+63,368
| +5,207% | +$5.68M |
|
1413
PUT
GoDaddy
GDDY
$12.3B
| $6.07M | ﹤0.01% |
57,200
-79,400
| -58% | -$7.1M |
|
1414
CALL
Vistra
VST
$55.1B
| $6.06M | ﹤0.01% |
157,300
+3,600
| +2% | +$125K |
|
1415
CALL
Illinois Tool Works
ITW
$81B
| $6.05M | ﹤0.01% |
23,100
+2,700
| +13% | +$647K |
|
1416
Axalta
AXTA
$7.08B
| $6.01M | ﹤0.01% |
177,092
+174,135
| +5,889% | +$5.22M |
|
1417
PUT
Monster Beverage
MNST
$91B
| $6.01M | ﹤0.01% |
104,400
+64,500
| +162% | +$3.45M |
|
1418
CALL
BridgeBio Pharma
BBIO
$16.5B
| $6.01M | ﹤0.01% |
148,800
-155,800
| -51% | -$4.68M |
|
1419
CALL
RingCentral
RNG
$4.19B
| $6M | ﹤0.01% |
176,700
+22,900
| +15% | +$684K |
|
1420
PUT
Enovix
ENVX
$860M
| $6M | ﹤0.01% |
547,429
-18,057
| -3% | -$177K |
|
|
NUVL
1421
CALL
DELISTED
Nuvalent
NUVL
| $5.99M | ﹤0.01% |
81,400
+23,700
| +41% | +$1.47M |
|
1422
CALL
Alaska Air
ALK
$5.15B
| $5.94M | ﹤0.01% |
152,100
+60,900
| +67% | +$2.17M |
|
1423
Hilton Worldwide
HLT
$74.1B
| $5.94M | ﹤0.01% |
+32,633
| New | +$5.33M |
|
|
TWO
1424
CALL
Two Harbors Investment
TWO
$1.27B
| $5.92M | ﹤0.01% |
827,600
+228,300
| +38% | +$2.95M |
|
1425
PUT
Spectrum Brands
SPB
$2.03B
| $5.91M | ﹤0.01% |
74,100
+41,400
| +127% | +$3.12M |
|
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.