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 | |
|---|---|---|---|---|---|---|
351
CALL
SLB Ltd
SLB
$71.3B
| $49.5M | 0.03% |
951,300
-10,300
| -1% | -$560K |
|
352
CALL
KLA
KLAC
$280B
| $49.3M | 0.03% |
848,000
+467,000
| +123% | +$24.3M |
|
|
DOCU
353
CALL
DocuSign
DOCU
$9.14B
| $48.8M | 0.03% |
820,300
+253,800
| +45% | +$11.6M |
|
354
PUT
Newmont
NEM
$102B
| $48.6M | 0.03% |
1,177,900
+29,700
| +3% | +$1.15M |
|
355
CALL
Atlassian
TEAM
$21.7B
| $48.4M | 0.03% |
203,600
+25,500
| +14% | +$5.01M |
|
356
CALL
Arista Networks
ANET
$220B
| $48.4M | 0.03% |
822,000
+12,000
| +1% | +$630K |
|
357
PUT
Twilio
TWLO
$27.8B
| $48.2M | 0.03% |
635,700
-10,100
| -2% | -$630K |
|
358
CALL
Capital One
COF
$124B
| $48.2M | 0.03% |
367,600
+151,400
| +70% | +$16.3M |
|
359
CALL
EOG Resources
EOG
$76.7B
| $48.1M | 0.03% |
397,300
+37,000
| +10% | +$4.61M |
|
360
CALL
Devon Energy
DVN
$51.8B
| $47.9M | 0.03% |
1,056,600
-149,300
| -12% | -$6.84M |
|
361
CALL
Wynn Resorts
WYNN
$9.79B
| $47.4M | 0.03% |
520,300
+123,600
| +31% | +$11M |
|
|
362
CALL
Newmont
NEM
$102B
| $47.3M | 0.03% |
1,147,300
+582,500
| +103% | +$22.5M |
|
363
PUT
Estee Lauder
EL
$29.9B
| $47.3M | 0.03% |
323,400
+95,200
| +42% | +$12.6M |
|
364
CALL
Baidu
BIDU
$36.6B
| $47.3M | 0.03% |
397,100
-67,000
| -14% | -$7.74M |
|
365
CALL
Lennar Class A
LEN
$19.8B
| $47.2M | 0.03% |
326,945
+12,603
| +4% | +$1.52M |
|
366
CALL
GE Aerospace
GE
$354B
| $47M | 0.03% |
482,781
-244,711
| -34% | -$22.7M |
|
367
PUT
Medtronic
MDT
$105B
| $46.6M | 0.03% |
566,200
+187,300
| +49% | +$14.3M |
|
368
PUT
Marriott International
MAR
$97.5B
| $46.5M | 0.03% |
280,800
-27,200
| -9% | -$5.51M |
|
369
CALL
Danaher
DHR
$127B
| $46.5M | 0.03% |
273,800
+80,348
| +42% | +$17.1M |
|
370
CALL
Progressive
PGR
$119B
| $46.4M | 0.03% |
291,400
-23,700
| -8% | -$3.71M |
|
|
371
PUT
Capital One
COF
$124B
| $46M | 0.03% |
350,900
+103,500
| +42% | +$11.2M |
|
372
PUT
SolarEdge
SEDG
$2.91B
| $46M | 0.03% |
491,300
+147,200
| +43% | +$13.4M |
|
373
CALL
Petrobras
PBR
$122B
| $45.9M | 0.03% |
2,895,800
+458,600
| +19% | +$7.02M |
|
374
PUT
Snap
SNAP
$7.52B
| $45.8M | 0.03% |
2,703,900
+719,000
| +36% | +$8.82M |
|
375
PUT
Valero Energy
VLO
$92.3B
| $45.7M | 0.03% |
351,600
+95,200
| +37% | +$12.1M |
|
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.