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 | |
|---|---|---|---|---|---|---|
451
CALL
Abbott
ABT
$175B
| $36.4M | 0.02% |
330,400
+19,700
| +6% | +$1.97M |
|
452
PUT
Northrop Grumman
NOC
$74.6B
| $36.2M | 0.02% |
77,400
+9,700
| +14% | +$4.55M |
|
453
PUT
Diamondback Energy
FANG
$57.1B
| $36.2M | 0.02% |
233,300
-62,400
| -21% | -$9.78M |
|
454
PUT
Shell
SHEL
$243B
| $36.1M | 0.02% |
549,200
-23,700
| -4% | -$1.56M |
|
455
PUT
Las Vegas Sands
LVS
$30B
| $36.1M | 0.02% |
733,300
+92,700
| +14% | +$4.38M |
|
456
PUT
NIO
NIO
$11.7B
| $36M | 0.02% |
3,969,800
+619,700
| +18% | +$4.92M |
|
|
WBA
457
PUT
DELISTED
Walgreens Boots Alliance
WBA
| $36M | 0.02% |
1,378,900
+385,900
| +39% | +$8.63M |
|
458
PUT
3M
MMM
$89.1B
| $36M | 0.02% |
393,843
-302,229
| -43% | -$24.3M |
|
459
PUT
Digital Realty Trust
DLR
$66B
| $35.9M | 0.02% |
266,900
+127,900
| +92% | +$16.5M |
|
460
PUT
GE Aerospace
GE
$354B
| $35.9M | 0.02% |
433,914
+30,323
| +8% | +$2.81M |
|
461
CALL
Eaton
ETN
$158B
| $35.9M | 0.02% |
149,000
-37,200
| -20% | -$8.21M |
|
462
PUT
Progressive
PGR
$119B
| $35.8M | 0.02% |
225,000
+150,500
| +202% | +$23.6M |
|
463
CALL
Riot Platforms
RIOT
$8.84B
| $35.8M | 0.02% |
2,315,400
+1,000,600
| +76% | +$12.1M |
|
464
PUT
Philip Morris
PM
$303B
| $35.8M | 0.02% |
380,700
+14,400
| +4% | +$1.33M |
|
465
PUT
EOG Resources
EOG
$76.7B
| $35.8M | 0.02% |
295,700
+23,500
| +9% | +$2.93M |
|
466
CALL
United Airlines
UAL
$38.1B
| $35.6M | 0.02% |
863,900
-135,800
| -14% | -$5.34M |
|
467
PUT
Cloudflare
NET
$95.5B
| $35.6M | 0.02% |
427,700
+16,800
| +4% | +$1.18M |
|
468
PUT
Teck Resources
TECK
$28B
| $35.5M | 0.02% |
838,800
+264,100
| +46% | +$10.1M |
|
469
PUT
Align Technology
ALGN
$12.4B
| $35.3M | 0.02% |
128,800
+48,500
| +60% | +$11.5M |
|
470
PUT
Zillow
Z
$7.18B
| $35.3M | 0.02% |
609,900
+247,000
| +68% | +$10.9M |
|
471
PUT
Phillips 66
PSX
$84.8B
| $35.2M | 0.02% |
264,500
+106,900
| +68% | +$12.8M |
|
472
PUT
Simon Property Group
SPG
$73.4B
| $35M | 0.02% |
245,400
+99,800
| +69% | +$12.1M |
|
473
Nike
NKE
$62.6B
| $34.8M | 0.02% |
320,078
+131,684
| +70% | +$14.2M |
|
474
CALL
Marriott International
MAR
$97.5B
| $34.7M | 0.02% |
154,000
-61,000
| -28% | -$12.4M |
|
475
CALL
Advance Auto Parts
AAP
$3.35B
| $34.4M | 0.02% |
563,600
+26,900
| +5% | +$1.47M |
|
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.