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 | |
|---|---|---|---|---|---|---|
376
PUT
Kenvue
KVUE
$36.7B
| $45.6M | 0.03% |
2,119,900
+943,000
| +80% | +$18.9M |
|
377
CALL
Cigna
CI
$75.4B
| $45.6M | 0.03% |
152,300
+98,900
| +185% | +$28.9M |
|
378
CALL
American Electric Power
AEP
$72.4B
| $45.5M | 0.03% |
560,700
+415,400
| +286% | +$32.2M |
|
379
PUT
American Tower
AMT
$77.4B
| $45.4M | 0.03% |
210,200
+100,800
| +92% | +$19M |
|
380
CALL
Workday
WDAY
$32.7B
| $45.3M | 0.03% |
178,200
-19,100
| -10% | -$4.55M |
|
381
PUT
VanEck Durable High Dividend ETF
DURA
$38.5M
| $45.3M | 0.03% |
166,000
+53,700
| +48% | +$1.61M |
|
382
PUT
KLA
KLAC
$280B
| $45.1M | 0.03% |
776,000
+294,000
| +61% | +$15.3M |
|
383
PUT
Bristol-Myers Squibb
BMY
$124B
| $45M | 0.03% |
877,300
-51,600
| -6% | -$2.71M |
|
384
CALL
Marathon Petroleum
MPC
$92.2B
| $44.9M | 0.03% |
302,400
-90,700
| -23% | -$13.5M |
|
385
CALL
Lyft
LYFT
$5.57B
| $44.8M | 0.03% |
2,988,300
+1,110,700
| +59% | +$12.9M |
|
386
PUT
Upstart Holdings
UPST
$2.74B
| $44.5M | 0.03% |
1,088,000
+180,600
| +20% | +$5.5M |
|
387
CALL
Wayfair
W
$11.1B
| $44.1M | 0.03% |
714,100
+215,400
| +43% | +$11.3M |
|
388
PUT
CVS Health
CVS
$138B
| $44M | 0.03% |
557,600
-603,900
| -52% | -$43M |
|
389
CALL
Dick's Sporting Goods
DKS
$18.8B
| $44M | 0.03% |
299,500
+106,000
| +55% | +$12.9M |
|
390
CALL
Apollo Global Management
APO
$68.6B
| $44M | 0.03% |
472,100
+56,700
| +14% | +$5.01M |
|
391
PUT
Cameco
CCJ
$39.4B
| $43.8M | 0.03% |
1,015,100
-32,400
| -3% | -$1.36M |
|
392
PUT
Celsius Holdings
CELH
$7.28B
| $43.7M | 0.03% |
801,900
+276,600
| +53% | +$14.8M |
|
393
PUT
Atlassian
TEAM
$21.7B
| $43.6M | 0.03% |
183,300
+10,500
| +6% | +$2.06M |
|
|
394
CALL
VanEck Durable High Dividend ETF
DURA
$38.5M
| $43.6M | 0.03% |
161,500
-17,700
| -10% | -$531K |
|
|
BINI
395
CALL
DELISTED
Bollinger Innovations
BINI
| – | – |
0
| – | – |
|
396
CALL
DoorDash
DASH
$77.4B
| $43.5M | 0.03% |
439,600
-98,300
| -18% | -$8.71M |
|
397
CALL
Linde
LIN
$235B
| $43.2M | 0.03% |
105,300
+30,900
| +42% | +$12.2M |
|
398
PUT
Alcoa
AA
$12.2B
| $42.9M | 0.03% |
1,261,400
+433,100
| +52% | +$11.7M |
|
399
PUT
Autodesk
ADSK
$43B
| $42.9M | 0.03% |
176,100
-148,600
| -46% | -$32.1M |
|
400
CALL
Valero Energy
VLO
$92.3B
| $42.7M | 0.03% |
328,100
+29,100
| +10% | +$3.7M |
|
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.