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 | |
|---|---|---|---|---|---|---|
476
PUT
Expedia Group
EXPE
$31.3B
| $34.4M | 0.02% |
226,600
-30,000
| -12% | -$3.67M |
|
477
PUT
Halliburton
HAL
$27.6B
| $34.3M | 0.02% |
948,300
+78,600
| +9% | +$3.02M |
|
478
PUT
Hershey
HSY
$35B
| $34.2M | 0.02% |
183,600
+32,300
| +21% | +$6.12M |
|
479
PUT
Gilead Sciences
GILD
$162B
| $34.1M | 0.02% |
420,600
-24,000
| -5% | -$1.87M |
|
480
CALL
Cummins
CMI
$91.2B
| $34.1M | 0.02% |
142,200
+43,000
| +43% | +$9.78M |
|
481
CALL
Dominion Energy
D
$62.5B
| $33.9M | 0.02% |
722,200
+187,300
| +35% | +$8.36M |
|
482
CALL
Dow Inc
DOW
$22.5B
| $33.7M | 0.02% |
615,400
+144,700
| +31% | +$7.39M |
|
483
PUT
Invesco Aerospace & Defense ETF
PPA
$8.03B
| $33.7M | 0.02% |
218,900
-16,200
| -7% | -$1.39M |
|
484
PUT
NXP Semiconductors
NXPI
$70.4B
| $33.7M | 0.02% |
146,700
-51,900
| -26% | -$10.4M |
|
485
CALL
Burlington
BURL
$22.3B
| $33.7M | 0.02% |
173,100
+53,500
| +45% | +$7.98M |
|
486
CALL
Las Vegas Sands
LVS
$30B
| $33.7M | 0.02% |
683,900
+268,300
| +65% | +$12.7M |
|
487
PUT
Pultegroup
PHM
$24.1B
| $33.6M | 0.02% |
325,500
+2,300
| +0.7% | +$195K |
|
|
HES
488
PUT
DELISTED
Hess
HES
| $33.3M | 0.02% |
231,300
-120,000
| -34% | -$17.6M |
|
489
PUT
Western Digital
WDC
$192B
| $33.3M | 0.02% |
842,090
+152,410
| +22% | +$5.33M |
|
490
PUT
US Bancorp Series B Preferred Stock
USB.PRH
$747M
| $33.3M | 0.02% |
770,100
-101,200
| -12% | -$1.99M |
|
|
B
491
Barrick Mining
B
$62.8B
| $33.3M | 0.02% |
1,839,464
+772,822
| +72% | +$12.7M |
|
492
CALL
Clorox
CLX
$11.6B
| $33.2M | 0.02% |
232,500
+54,100
| +30% | +$7.21M |
|
493
CALL
Air Products & Chemicals
APD
$66.1B
| $33.1M | 0.02% |
120,900
-12,300
| -9% | -$3.38M |
|
494
PUT
Thermo Fisher Scientific
TMO
$196B
| $33M | 0.02% |
62,200
+9,000
| +17% | +$4.36M |
|
495
PUT
Constellation Brands
STZ
$22.6B
| $32.7M | 0.02% |
135,200
+9,000
| +7% | +$2.14M |
|
496
PUT
Abbott
ABT
$175B
| $32.4M | 0.02% |
294,400
+56,600
| +24% | +$5.66M |
|
497
PUT
DuPont de Nemours
DD
$18.9B
| $32.3M | 0.02% |
334,759
+140,532
| +72% | +$12.8M |
|
498
CALL
Rio Tinto
RIO
$150B
| $32.2M | 0.02% |
433,100
+177,000
| +69% | +$11.9M |
|
499
CALL
Whirlpool
WHR
$2.41B
| $32.2M | 0.02% |
264,700
+205,100
| +344% | +$23.9M |
|
500
PUT
Synopsys
SNPS
$72.3B
| $32.2M | 0.02% |
62,500
-72,900
| -54% | -$37.3M |
|
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.