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 | |
|---|---|---|---|---|---|---|
|
UCD
876
PUT
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $14.4M | 0.01% |
189,100
-53,600
| -22% | -$4.09M |
|
877
CALL
Western Alliance Bancorporation
WAL
$8.99B
| $14.4M | 0.01% |
219,200
+86,600
| +65% | +$4.37M |
|
878
Ford
F
$56.1B
| $14.4M | 0.01% |
1,181,499
+273,710
| +30% | +$3.05M |
|
879
CALL
Deckers Outdoor
DECK
$13.4B
| $14.4M | 0.01% |
129,000
-34,800
| -21% | -$3.54M |
|
880
SolarEdge
SEDG
$2.73B
| $14.4M | 0.01% |
153,438
+53,370
| +53% | +$4.86M |
|
881
PUT
Alnylam Pharmaceuticals
ALNY
$35.6B
| $14.4M | 0.01% |
75,000
+19,500
| +35% | +$3.32M |
|
882
PUT
Arbor Realty Trust
ABR
$968M
| $14.3M | 0.01% |
942,300
+433,100
| +85% | +$5.96M |
|
883
PUT
SiriusXM
SIRI
$10B
| $14.2M | 0.01% |
260,320
+96,420
| +59% | +$4.63M |
|
884
CALL
Ingersoll Rand
IR
$33B
| $14.2M | 0.01% |
183,800
+137,700
| +299% | +$9.42M |
|
885
PUT
Veeva Systems
VEEV
$29.2B
| $14.2M | 0.01% |
73,700
+7,600
| +11% | +$1.43M |
|
886
CALL
Ferrari
RACE
$63.3B
| $14.2M | 0.01% |
41,900
+12,100
| +41% | +$4.04M |
|
887
CALL
AES
AES
$10.6B
| $14.1M | 0.01% |
734,800
+368,500
| +101% | +$5.99M |
|
888
PUT
Duke Energy
DUK
$101B
| $14.1M | 0.01% |
145,400
+62,000
| +74% | +$5.64M |
|
889
CALL
Tyson Foods
TSN
$19.9B
| $14.1M | 0.01% |
262,500
-24,900
| -9% | -$1.21M |
|
890
CALL
NRG Energy
NRG
$30.1B
| $14.1M | 0.01% |
272,300
-91,000
| -25% | -$4.11M |
|
891
CALL
Keysight
KEYS
$55.7B
| $14.1M | 0.01% |
88,400
+11,500
| +15% | +$1.56M |
|
892
PUT
J.M. Smucker
SJM
$12.3B
| $14.1M | 0.01% |
111,200
+36,100
| +48% | +$4.18M |
|
893
PUT
Seagate
STX
$208B
| $14.1M | 0.01% |
164,600
+35,300
| +27% | +$2.63M |
|
894
PUT
Boston Properties
BXP
$10.8B
| $14M | 0.01% |
199,400
+7,300
| +4% | +$431K |
|
895
CALL
American International
AIG
$41.6B
| $13.9M | 0.01% |
205,500
-8,900
| -4% | -$567K |
|
896
CALL
Abercrombie & Fitch
ANF
$4.03B
| $13.9M | 0.01% |
157,600
+6,700
| +4% | +$477K |
|
897
PUT
FMC
FMC
$1.45B
| $13.8M | 0.01% |
219,200
+40,400
| +23% | +$2.34M |
|
898
CALL
WIX.com
WIX
$2.05B
| $13.8M | 0.01% |
112,300
+40,100
| +56% | +$3.87M |
|
899
CVS Health
CVS
$136B
| $13.8M | 0.01% |
+174,311
| New | +$12.4M |
|
900
CALL
GitLab
GTLB
$5.09B
| $13.7M | 0.01% |
218,200
-33,900
| -13% | -$1.71M |
|
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.