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 | |
|---|---|---|---|---|---|---|
826
CALL
C.H. Robinson
CHRW
$24.4B
| $15.9M | 0.01% |
184,200
-14,600
| -7% | -$1.22M |
|
|
AYX
827
CALL
DELISTED
Alteryx Inc
AYX
| $15.9M | 0.01% |
337,100
-499,300
| -60% | -$19.4M |
|
|
AXON
828
CALL
Axon Enterprise
AXON
$39.8B
| $15.9M | 0.01% |
61,500
+2,200
| +4% | +$496K |
|
829
CALL
Norfolk Southern
NSC
$78.2B
| $15.9M | 0.01% |
67,200
+20,500
| +44% | +$4.3M |
|
830
PUT
KE Holdings
BEKE
$17.8B
| $15.8M | 0.01% |
977,200
+532,800
| +120% | +$8.24M |
|
831
CALL
Tower Semiconductor
TSEM
$29.2B
| $15.8M | 0.01% |
518,900
+301,900
| +139% | +$7.87M |
|
832
CALL
Futu Holdings
FUTU
$13.8B
| $15.7M | 0.01% |
287,900
-23,500
| -8% | -$1.34M |
|
|
CMA
833
PUT
DELISTED
Comerica
CMA
| $15.7M | 0.01% |
281,600
+91,200
| +48% | +$4.12M |
|
834
PUT
PBF Energy
PBF
$7.43B
| $15.7M | 0.01% |
357,400
-67,900
| -16% | -$3.08M |
|
835
PUT
State Street SPDR Portfolio Europe ETF
SPEU
$709M
| $15.7M | 0.01% |
328,600
-6,200
| -2% | -$231K |
|
836
PUT
Polaris
PII
$4.12B
| $15.7M | 0.01% |
165,700
+64,800
| +64% | +$5.94M |
|
837
PUT
Travelers Companies
TRV
$78.6B
| $15.7M | 0.01% |
82,400
+36,500
| +80% | +$6.32M |
|
838
CALL
T. Rowe Price
TROW
$24.5B
| $15.7M | 0.01% |
145,700
+71,900
| +97% | +$7.16M |
|
839
PUT
SL Green Realty
SLG
$3.78B
| $15.7M | 0.01% |
346,800
+8,200
| +2% | +$302K |
|
|
840
CALL
KE Holdings
BEKE
$17.8B
| $15.7M | 0.01% |
966,000
+493,200
| +104% | +$7.63M |
|
841
CALL
CRISPR Therapeutics
CRSP
$4.69B
| $15.7M | 0.01% |
250,000
+166,800
| +200% | +$9.22M |
|
|
842
CALL
PBF Energy
PBF
$7.43B
| $15.6M | 0.01% |
355,800
+176,100
| +98% | +$8M |
|
843
CALL
Zions Bancorporation
ZION
$10B
| $15.6M | 0.01% |
356,000
+48,700
| +16% | +$1.76M |
|
844
PUT
Burlington
BURL
$21.6B
| $15.6M | 0.01% |
80,300
-23,200
| -22% | -$3.46M |
|
845
CALL
Arbor Realty Trust
ABR
$950M
| $15.6M | 0.01% |
1,026,500
+714,400
| +229% | +$9.83M |
|
846
PUT
Sunrun
RUN
$2.51B
| $15.6M | 0.01% |
792,600
+178,400
| +29% | +$2.26M |
|
|
CGC
847
CALL
Canopy Growth
CGC
$378M
| $15.6M | 0.01% |
3,043,800
+2,770,420
| +1,013% | +$16.5M |
|
848
CALL
Digital Realty Trust
DLR
$66.6B
| $15.5M | 0.01% |
115,500
-300
| -0.3% | -$38.7K |
|
849
CALL
Old Dominion Freight Line
ODFL
$47.9B
| $15.5M | 0.01% |
76,600
-14,000
| -15% | -$2.78M |
|
850
PUT
Yum! Brands
YUM
$40.8B
| $15.5M | 0.01% |
118,500
+15,500
| +15% | +$1.93M |
|
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.