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 | |
|---|---|---|---|---|---|---|
576
CALL
Crown Castle
CCI
$33.8B
| $27.7M | 0.02% |
240,400
+4,400
| +2% | +$451K |
|
577
PUT
Air Products & Chemicals
APD
$66.1B
| $27.6M | 0.02% |
100,900
+79,700
| +376% | +$21.9M |
|
578
PUT
Rio Tinto
RIO
$150B
| $27.6M | 0.02% |
370,000
+65,800
| +22% | +$4.41M |
|
579
PUT
Antero Resources
AR
$10.9B
| $27.5M | 0.02% |
1,211,100
+642,200
| +113% | +$16.3M |
|
580
PUT
Proshares UltraShort Technology
REW
$3.3M
| $27.4M | 0.02% |
213,100
+54,075
| +34% | +$4.18M |
|
581
PUT
HCA Healthcare
HCA
$82.5B
| $27.4M | 0.02% |
101,200
+30,400
| +43% | +$7.51M |
|
582
PUT
United States Oil Fund
USO
$2.36B
| $27.4M | 0.02% |
410,800
+157,100
| +62% | +$11.4M |
|
583
PUT
PNC Financial Services
PNC
$101B
| $27.4M | 0.02% |
176,800
-60,700
| -26% | -$7.86M |
|
584
CALL
Baxter International
BAX
$11.2B
| $27.3M | 0.02% |
706,100
+629,900
| +827% | +$22.3M |
|
585
PUT
Advance Auto Parts
AAP
$3.35B
| $27.3M | 0.02% |
446,700
+253,500
| +131% | +$13.9M |
|
586
PUT
Take-Two Interactive
TTWO
$43.4B
| $27.2M | 0.02% |
177,200
+7,600
| +4% | +$1.13M |
|
587
CALL
Southern Company
SO
$108B
| $27.2M | 0.02% |
387,300
+182,300
| +89% | +$12.5M |
|
588
CALL
Kroger
KR
$35.3B
| $27.1M | 0.02% |
592,800
+310,600
| +110% | +$13.8M |
|
|
589
CALL
United States Oil Fund
USO
$2.36B
| $26.8M | 0.02% |
401,600
+136,200
| +51% | +$9.88M |
|
590
CALL
Hasbro
HAS
$12.6B
| $26.7M | 0.02% |
523,700
+340,700
| +186% | +$17.2M |
|
591
CALL
Archer Daniels Midland
ADM
$42.1B
| $26.7M | 0.02% |
370,000
+171,300
| +86% | +$12.5M |
|
592
PUT
Paycom
PAYC
$6.5B
| $26.7M | 0.02% |
129,200
+99,300
| +332% | +$21M |
|
593
iShares Russell 2000 ETF
IWM
$81.6B
| $26.7M | 0.02% |
+132,945
| New | +$23.8M |
|
594
PUT
Vale
VALE
$63.2B
| $26.6M | 0.02% |
1,674,300
+109,300
| +7% | +$1.57M |
|
595
CALL
HP
HPQ
$23B
| $26.4M | 0.02% |
877,000
+176,600
| +25% | +$4.95M |
|
596
CALL
Oneok
OKE
$57.8B
| $26.4M | 0.02% |
375,600
+36,200
| +11% | +$2.43M |
|
597
PUT
Macy's
M
$6.4B
| $26.3M | 0.02% |
1,309,100
+49,200
| +4% | +$712K |
|
598
PUT
Cintas
CTAS
$80.6B
| $26.3M | 0.02% |
174,800
-100,800
| -37% | -$13.5M |
|
599
CALL
General Dynamics
GD
$101B
| $26.3M | 0.02% |
101,400
+29,700
| +41% | +$7.25M |
|
600
CALL
NetEase
NTES
$77.6B
| $26.2M | 0.02% |
281,100
+121,400
| +76% | +$12.9M |
|
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.