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 | |
|---|---|---|---|---|---|---|
401
CALL
Lowe's Companies
LOW
$115B
| $42.5M | 0.03% |
191,100
-86,900
| -31% | -$17.6M |
|
402
PUT
Pinterest
PINS
$12.6B
| $42.5M | 0.03% |
1,147,000
-533,500
| -32% | -$16.8M |
|
403
PUT
MGM Resorts International
MGM
$11.6B
| $42.2M | 0.03% |
943,700
-63,500
| -6% | -$2.49M |
|
404
PUT
Domino's
DPZ
$10.6B
| $41.6M | 0.03% |
100,900
+12,400
| +14% | +$4.65M |
|
405
PUT
Cigna
CI
$75.4B
| $41M | 0.03% |
136,800
+18,800
| +16% | +$5.49M |
|
406
Salesforce
CRM
$133B
| $40.4M | 0.03% |
153,687
+42,488
| +38% | +$9.62M |
|
407
CALL
Scorpio Tankers
STNG
$3.9B
| $40.4M | 0.03% |
664,000
-53,200
| -7% | -$3M |
|
|
408
CALL
Domino's
DPZ
$10.6B
| $40.3M | 0.03% |
97,800
+27,600
| +39% | +$10.4M |
|
409
CALL
Trade Desk
TTD
$8.26B
| $40.3M | 0.03% |
559,800
+225,500
| +67% | +$16.6M |
|
410
CALL
American Airlines Group
AAL
$9.78B
| $40.2M | 0.03% |
2,925,000
-321,900
| -10% | -$4.04M |
|
|
DOCU
411
PUT
DocuSign
DOCU
$9.14B
| $40.2M | 0.03% |
675,500
-42,500
| -6% | -$1.95M |
|
412
PUT
Arm
ARM
$303B
| $40.2M | 0.03% |
534,400
+224,500
| +72% | +$13.1M |
|
413
CALL
Intuitive Surgical
ISRG
$121B
| $40.1M | 0.03% |
119,000
+10,000
| +9% | +$2.98M |
|
414
PUT
TJX Companies
TJX
$172B
| $40.1M | 0.03% |
427,700
+298,300
| +231% | +$26.8M |
|
415
PUT
DaVita
DVA
$14.9B
| $40.1M | 0.03% |
382,700
+237,200
| +163% | +$21.9M |
|
416
CALL
Northrop Grumman
NOC
$74.6B
| $40.1M | 0.03% |
85,600
+35,500
| +71% | +$16.6M |
|
417
Pfizer
PFE
$141B
| $39.7M | 0.03% |
1,380,121
-575,573
| -29% | -$17.4M |
|
|
B
418
PUT
Barrick Mining
B
$62.8B
| $39.7M | 0.03% |
2,195,800
+633,200
| +41% | +$10.4M |
|
419
CALL
Truist Financial
TFC
$63.2B
| $39.7M | 0.03% |
1,075,300
+590,500
| +122% | +$18.5M |
|
420
CALL
Vertiv
VRT
$116B
| $39.7M | 0.03% |
826,200
+276,600
| +50% | +$11.8M |
|
421
PUT
Marathon Petroleum
MPC
$92.2B
| $39.7M | 0.03% |
267,400
-36,800
| -12% | -$5.47M |
|
422
CALL
3M
MMM
$89.1B
| $39M | 0.02% |
426,852
-85,754
| -17% | -$6.88M |
|
423
CALL
Zillow
Z
$7.18B
| $38.9M | 0.02% |
674,100
+160,000
| +31% | +$7.05M |
|
424
CALL
Align Technology
ALGN
$12.4B
| $38.9M | 0.02% |
141,800
+87,600
| +162% | +$20.8M |
|
425
CALL
UBS Group
UBS
$173B
| $38.8M | 0.02% |
1,256,100
+144,900
| +13% | +$3.81M |
|
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.