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 | |
|---|---|---|---|---|---|---|
501
Micron Technology
MU
$1.08T
| $32.1M | 0.02% |
+376,708
| New | +$28M |
|
502
PUT
APA Corp
APA
$12.8B
| $32M | 0.02% |
892,000
+429,200
| +93% | +$16.2M |
|
503
PUT
Honeywell
HON
$73.8B
| $32M | 0.02% |
225,250
+104,190
| +86% | +$18.8M |
|
504
Tesla
TSLA
$1.4T
| $31.8M | 0.02% |
+127,962
| New | +$30.4M |
|
505
CALL
General Mills
GIS
$19.7B
| $31.7M | 0.02% |
487,200
+63,600
| +15% | +$4.11M |
|
506
PUT
Edwards Lifesciences
EW
$48.6B
| $31.7M | 0.02% |
415,900
+190,500
| +85% | +$13.3M |
|
507
PUT
Williams-Sonoma
WSM
$26.2B
| $31.7M | 0.02% |
314,200
+115,400
| +58% | +$9.99M |
|
508
CALL
HCA Healthcare
HCA
$82.5B
| $31.6M | 0.02% |
116,700
+18,800
| +19% | +$4.65M |
|
509
PUT
Live Nation Entertainment
LYV
$41.4B
| $31.6M | 0.02% |
337,400
+29,000
| +9% | +$2.5M |
|
510
PUT
Robinhood
HOOD
$93.8B
| $31.6M | 0.02% |
2,476,700
+1,639,200
| +196% | +$16.3M |
|
511
PUT
Workday
WDAY
$32.7B
| $31.5M | 0.02% |
130,500
-51,300
| -28% | -$12.2M |
|
512
CALL
BP
BP
$112B
| $31.3M | 0.02% |
884,900
-114,500
| -11% | -$4.19M |
|
513
PUT
Truist Financial
TFC
$63.2B
| $31.2M | 0.02% |
845,300
+330,600
| +64% | +$10.4M |
|
514
CALL
HubSpot
HUBS
$10.5B
| $31.2M | 0.02% |
53,700
+17,300
| +48% | +$8.32M |
|
515
CALL
Federal Agricultural Mortgage Class A
AGM.A
| $31M | 0.02% |
162,200
+120,900
| +293% | +$15.3M |
|
516
PUT
Builders FirstSource
BLDR
$7.64B
| $30.9M | 0.02% |
185,200
-4,800
| -3% | -$638K |
|
517
PUT
Dow Inc
DOW
$22.5B
| $30.9M | 0.02% |
563,600
+175,600
| +45% | +$8.97M |
|
518
PayPal
PYPL
$49B
| $30.9M | 0.02% |
502,579
-334,382
| -40% | -$19.2M |
|
519
CALL
AMC Entertainment Holdings
AMC
$2.01B
| $30.8M | 0.02% |
5,227,700
+942,500
| +22% | +$7.65M |
|
520
PUT
Riot Platforms
RIOT
$8.84B
| $30.8M | 0.02% |
1,990,200
+439,400
| +28% | +$5.3M |
|
521
CALL
Paycom
PAYC
$6.5B
| $30.8M | 0.02% |
148,900
+93,100
| +167% | +$19.7M |
|
522
PUT
Ally Financial
ALLY
$13.7B
| $30.8M | 0.02% |
881,200
+272,400
| +45% | +$7.61M |
|
523
CALL
Pultegroup
PHM
$24.1B
| $30.8M | 0.02% |
298,100
-27,000
| -8% | -$2.29M |
|
524
PUT
Zions Bancorporation
ZION
$10.3B
| $30.6M | 0.02% |
698,300
+283,000
| +68% | +$10.2M |
|
525
PUT
Analog Devices
ADI
$188B
| $30.5M | 0.02% |
153,800
+18,200
| +13% | +$3.25M |
|
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.