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 | |
|---|---|---|---|---|---|---|
526
PUT
CME Group
CME
$90.1B
| $30.5M | 0.02% |
144,900
+31,400
| +28% | +$6.7M |
|
527
CALL
eBay
EBAY
$49.3B
| $30.1M | 0.02% |
691,000
+246,800
| +56% | +$10.2M |
|
528
PUT
Avis
CAR
$5.81B
| $30.1M | 0.02% |
169,700
+46,300
| +38% | +$8.44M |
|
529
CALL
Southwest Airlines
LUV
$23.3B
| $30.1M | 0.02% |
1,041,500
+90,600
| +10% | +$2.36M |
|
530
PUT
SAP
SAP
$174B
| $30.1M | 0.02% |
194,500
+60,800
| +45% | +$8.79M |
|
531
CALL
D.R. Horton
DHI
$40.4B
| $30M | 0.02% |
197,200
+23,900
| +14% | +$2.94M |
|
532
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $29.9M | 0.02% |
59,000
+44,000
| +293% | +$20.4M |
|
533
Chevron
CVX
$384B
| $29.8M | 0.02% |
+199,869
| New | +$30.2M |
|
534
PUT
Darden Restaurants
DRI
$22.2B
| $29.8M | 0.02% |
181,300
+4,000
| +2% | +$606K |
|
535
CALL
Prudential Financial
PRU
$41.3B
| $29.8M | 0.02% |
287,200
+109,500
| +62% | +$10.5M |
|
536
PUT
BHP
BHP
$215B
| $29.7M | 0.02% |
436,000
+145,400
| +50% | +$8.78M |
|
537
PUT
BP
BP
$112B
| $29.7M | 0.02% |
839,900
+164,600
| +24% | +$6.03M |
|
538
CALL
TJX Companies
TJX
$172B
| $29.7M | 0.02% |
316,800
-161,000
| -34% | -$14.4M |
|
539
PUT
Crown Castle
CCI
$33.8B
| $29.6M | 0.02% |
256,900
+177,100
| +222% | +$18.1M |
|
540
CALL
Western Digital
WDC
$192B
| $29.5M | 0.02% |
745,643
+233,510
| +46% | +$8.17M |
|
541
PUT
Vanguard Consumer Discretionary ETF
VCR
$6.07B
| $29.4M | 0.02% |
61,200
-3,000
| -5% | -$836K |
|
542
ARK Innovation ETF
ARKK
$6.23B
| $29.4M | 0.02% |
+560,455
| New | +$24.3M |
|
543
CALL
US Bancorp Series B Preferred Stock
USB.PRH
$747M
| $29.3M | 0.02% |
676,200
+41,600
| +7% | +$816K |
|
544
CALL
Synchrony
SYF
$24.5B
| $29.2M | 0.02% |
764,000
+540,200
| +241% | +$17.1M |
|
545
CALL
Skyworks Solutions
SWKS
$9.5B
| $29.1M | 0.02% |
259,100
+116,300
| +81% | +$11.4M |
|
546
PUT
Etsy
ETSY
$7.64B
| $29.1M | 0.02% |
358,700
-13,900
| -4% | -$994K |
|
547
PUT
Sarepta Therapeutics
SRPT
$1.67B
| $29M | 0.02% |
301,200
-29,400
| -9% | -$2.82M |
|
548
PUT
C3.ai
AI
$1.27B
| $29M | 0.02% |
1,008,900
-58,500
| -5% | -$1.61M |
|
549
PUT
Caesars Entertainment
CZR
$6.1B
| $28.9M | 0.02% |
617,500
+335,100
| +119% | +$14.9M |
|
550
CALL
Crocs
CROX
$6.77B
| $28.9M | 0.02% |
309,900
-72,800
| -19% | -$6.72M |
|
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.