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 | |
|---|---|---|---|---|---|---|
551
PUT
Biogen
BIIB
$29.2B
| $28.9M | 0.02% |
111,500
+800
| +0.7% | +$196K |
|
552
CALL
Alcoa
AA
$12.2B
| $28.7M | 0.02% |
843,800
+207,500
| +33% | +$5.61M |
|
553
PUT
ON Semiconductor
ON
$35.9B
| $28.6M | 0.02% |
342,600
-21,900
| -6% | -$1.72M |
|
554
Walmart Inc
WMT
$870B
| $28.6M | 0.02% |
543,483
+429,486
| +377% | +$22.7M |
|
555
CALL
Wheaton Precious Metals
WPM
$50.6B
| $28.5M | 0.02% |
578,100
+322,600
| +126% | +$14.6M |
|
556
PUT
AT&T
T
$160B
| $28.5M | 0.02% |
2,004,200
-409,700
| -17% | -$6.47M |
|
|
557
CALL
Biogen
BIIB
$29.2B
| $28.5M | 0.02% |
110,000
+4,500
| +4% | +$1.11M |
|
558
PUT
HubSpot
HUBS
$10.5B
| $28.4M | 0.02% |
49,000
+29,300
| +149% | +$14.1M |
|
559
PUT
Crocs
CROX
$6.77B
| $28.4M | 0.02% |
304,500
-90,600
| -23% | -$8.36M |
|
560
CALL
Autodesk
ADSK
$43B
| $28.4M | 0.02% |
116,600
-112,300
| -49% | -$24.2M |
|
561
CALL
Gilead Sciences
GILD
$162B
| $28.3M | 0.02% |
349,700
+29,000
| +9% | +$2.26M |
|
562
PUT
Dollar Tree
DLTR
$23.5B
| $28.3M | 0.02% |
199,400
-13,200
| -6% | -$1.56M |
|
563
PUT
MetLife
MET
$60B
| $28.3M | 0.02% |
427,700
+107,200
| +33% | +$6.71M |
|
564
CALL
Best Buy
BBY
$18.4B
| $28.3M | 0.02% |
361,000
+129,800
| +56% | +$9.14M |
|
565
CALL
SolarEdge
SEDG
$2.91B
| $28.2M | 0.02% |
301,700
+199,700
| +196% | +$18.2M |
|
566
CALL
BioNTech
BNTX
$23.2B
| $28.2M | 0.02% |
271,000
+200,600
| +285% | +$20.2M |
|
567
PUT
Automatic Data Processing
ADP
$97.2B
| $28.2M | 0.02% |
120,900
+67,400
| +126% | +$15.7M |
|
568
CALL
Generac Holdings
GNRC
$12.6B
| $28.1M | 0.02% |
217,800
+54,300
| +33% | +$5.96M |
|
569
CALL
Alpha Metallurgical Resources
AMR
$1.86B
| $28.1M | 0.02% |
82,800
+16,900
| +26% | +$4.45M |
|
570
CALL
BILL Holdings
BILL
$4.17B
| $28M | 0.02% |
343,500
+171,100
| +99% | +$14M |
|
571
Humana
HUM
$47.7B
| $27.9M | 0.02% |
61,035
+59,060
| +2,990% | +$29.1M |
|
572
CALL
Constellation Brands
STZ
$22.6B
| $27.9M | 0.02% |
115,500
-12,200
| -10% | -$2.9M |
|
573
PUT
Floor & Decor
FND
$5.86B
| $27.9M | 0.02% |
250,000
+171,800
| +220% | +$15.8M |
|
574
PUT
Clorox
CLX
$11.6B
| $27.8M | 0.02% |
195,000
+106,700
| +121% | +$14.2M |
|
|
575
PUT
Best Buy
BBY
$18.4B
| $27.7M | 0.02% |
354,300
+10,400
| +3% | +$732K |
|
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.