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 | Miscellaneous | 98.27% |
| 2 | Technology | 0.33% |
| 3 | Consumer Discretionary | 0.3% |
| 4 | Communication Services | 0.21% |
| 5 | Financials | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
626
PUT
Match Group
MTCH
$9.61B
| $24.8M | 0.02% |
678,600
+450,000
| +197% | +$15.2M |
|
627
PUT
Hilton Worldwide
HLT
$70B
| $24.7M | 0.02% |
135,700
+80,900
| +148% | +$13.2M |
|
628
PUT
Trade Desk
TTD
$6.78B
| $24.7M | 0.02% |
343,200
-58,500
| -15% | -$4.3M |
|
|
EA
629
CALL
DELISTED
Electronic Arts
EA
| $24.7M | 0.02% |
180,300
+22,000
| +14% | +$2.91M |
|
|
SCIU
630
CALL
DELISTED
Global X Scientific Beta US ETF
SCIU
| $24.7M | 0.02% |
926,900
+92,400
| +11% | +$2.46M |
|
631
CALL
Cboe Global Markets
CBOE
$31.2B
| $24.3M | 0.02% |
136,200
+70,600
| +108% | +$12.1M |
|
|
NXH
632
CALL
Neighborhood Intelligence Inc
NXH
$377M
| $24.3M | 0.02% |
965,360
+737,770
| +324% | +$12.7M |
|
633
CALL
KKR & Co
KKR
$96.7B
| $24.3M | 0.02% |
292,900
+168,800
| +136% | +$11.4M |
|
634
First Solar
FSLR
$22B
| $24.3M | 0.02% |
+140,831
| New | +$21.5M |
|
635
Broadcom
AVGO
$1.7T
| $24.2M | 0.02% |
+217,180
| New | +$20.6M |
|
636
CALL
SentinelOne
S
$6.92B
| $24.2M | 0.02% |
883,400
+302,700
| +52% | +$5.86M |
|
|
SPLK
637
CALL
DELISTED
Splunk Inc
SPLK
| $24.2M | 0.02% |
159,000
-148,900
| -48% | -$22.2M |
|
638
CALL
Emerson Electric
EMR
$85.2B
| $24.1M | 0.02% |
247,700
+17,900
| +8% | +$1.64M |
|
639
PUT
Kroger
KR
$35.9B
| $24.1M | 0.02% |
526,900
+284,200
| +117% | +$12.6M |
|
640
CALL
Antero Resources
AR
$12.1B
| $24M | 0.02% |
1,059,800
+689,200
| +186% | +$17.5M |
|
641
CALL
Simon Property Group
SPG
$67.8B
| $24M | 0.02% |
168,400
-33,200
| -16% | -$4.01M |
|
642
CALL
Franco-Nevada
FNV
$51.3B
| $24M | 0.02% |
216,200
+73,100
| +51% | +$8.89M |
|
643
CALL
Microchip Technology
MCHP
$40.3B
| $23.7M | 0.02% |
262,900
+48,700
| +23% | +$3.96M |
|
644
CALL
Becton Dickinson
BDX
$50.3B
| $23.5M | 0.02% |
96,500
+19,000
| +25% | +$4.68M |
|
645
PUT
Cleveland-Cliffs
CLF
$7.13B
| $23.4M | 0.02% |
1,148,400
+466,000
| +68% | +$7.98M |
|
646
CALL
Energy Transfer Partners
ET
$74B
| $23.4M | 0.02% |
1,696,200
-587,200
| -26% | -$7.98M |
|
647
PUT
Toll Brothers
TOL
$13.1B
| $23.3M | 0.01% |
226,800
+59,400
| +35% | +$4.95M |
|
|
648
PUT
Microchip Technology
MCHP
$40.3B
| $23.2M | 0.01% |
257,400
-121,300
| -32% | -$9.88M |
|
649
CALL
Automatic Data Processing
ADP
$110B
| $23.1M | 0.01% |
99,300
+21,700
| +28% | +$5.06M |
|
650
CALL
iShares Core MSCI Emerging Markets ETF
IEMG
$165B
| $23.1M | 0.01% |
379,800
-44,100
| -10% | -$2.14M |
|
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's Q4 2023 filing shows 1,639 new, 3,920 increased, 3,074 reduced and 1,507 closed positions. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $136M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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 1,507 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.