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 |
Apple
AAPL
|
+$552M |
| 2 |
Strategy Inc
MSTR
|
+$85.8M |
| 3 |
MSTX
Defiance Daily Target 2x Long MSTR ETF
MSTX
|
+$48.1M |
| 4 |
Intel
INTC
|
+$45.4M |
| 5 |
Uber
UBER
|
+$43M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$133M |
| 2 |
Pinduoduo
PDD
|
+$82.6M |
| 3 |
Boeing
BA
|
+$49.8M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$45.1M |
| 5 |
Microsoft
MSFT
|
+$41M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.68% |
| 2 | Consumer Discretionary | 0.23% |
| 3 | Healthcare | 0.19% |
| 4 | Financials | 0.13% |
| 5 | Communication Services | 0.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
826
PUT
Automatic Data Processing
ADP
$97.1B
| $14.1M | 0.01% |
48,200
+3,700
| +8% | +$1.09M |
|
827
Danaher
DHR
$135B
| $14.1M | 0.01% |
+61,464
| New | +$15.1M |
|
828
PUT
VanEck Durable High Dividend ETF
DURA
$38.4M
| $14M | 0.01% |
56,500
-82,200
| -59% | -$2.81M |
|
829
CALL
Axsome Therapeutics
AXSM
$12.4B
| $14M | 0.01% |
165,600
+115,300
| +229% | +$10.6M |
|
830
PUT
Seagate
STX
$207B
| $14M | 0.01% |
161,900
-65,700
| -29% | -$6.61M |
|
831
CALL
PNC Financial Services
PNC
$99.5B
| $13.9M | 0.01% |
71,900
-50,900
| -41% | -$10M |
|
|
FLG
832
PUT
Flagstar Bank National Association
FLG
$6.13B
| $13.9M | 0.01% |
1,485,800
-327,000
| -18% | -$3.57M |
|
833
PUT
Cleveland-Cliffs
CLF
$6.25B
| $13.9M | 0.01% |
1,474,400
-79,100
| -5% | -$953K |
|
834
PUT
Realty Income
O
$60.4B
| $13.9M | 0.01% |
259,500
+46,900
| +22% | +$2.73M |
|
|
TYNS
835
PUT
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $13.8M | 0.01% |
93,700
-14,600
| -13% | -$2.16M |
|
836
CALL
Urban Outfitters
URBN
$5.96B
| $13.8M | 0.01% |
251,500
+151,400
| +151% | +$6.46M |
|
837
CALL
FTAI Aviation
FTAI
$22.2B
| $13.8M | 0.01% |
95,700
-8,000
| -8% | -$1.18M |
|
838
CALL
HSBC
HSBC
$349B
| $13.8M | 0.01% |
278,700
+82,500
| +42% | +$3.83M |
|
839
CALL
Peloton Interactive
PTON
$2.61B
| $13.8M | 0.01% |
1,582,200
+643,900
| +69% | +$5.02M |
|
840
CALL
Teradyne
TER
$58.5B
| $13.7M | 0.01% |
108,700
-46,300
| -30% | -$5.48M |
|
841
PUT
The Mosaic Company
MOS
$7.08B
| $13.7M | 0.01% |
556,700
+86,800
| +18% | +$2.27M |
|
|
IPFF
842
CALL
DELISTED
iShares International Preferred Stock ETF
IPFF
| $13.7M | 0.01% |
272,200
-3,800
| -1% | -$191K |
|
843
PUT
KE Holdings
BEKE
$17.8B
| $13.7M | 0.01% |
742,300
+515,600
| +227% | +$10.6M |
|
|
FLG
844
CALL
Flagstar Bank National Association
FLG
$6.13B
| $13.6M | 0.01% |
1,461,600
+142,700
| +11% | +$1.56M |
|
|
WCC
845
CALL
WESCO International
WCC
$16.1B
| $13.6M | 0.01% |
75,200
-60,400
| -45% | -$11.4M |
|
846
PUT
Zimmer Biomet
ZBH
$17.3B
| $13.6M | 0.01% |
128,600
+7,100
| +6% | +$762K |
|
847
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$45.6B
| $13.5M | 0.01% |
+31,837
| New | +$13.8M |
|
848
PUT
Arbor Realty Trust
ABR
$966M
| $13.5M | 0.01% |
977,000
+108,300
| +12% | +$1.6M |
|
849
PUT
The GEO Group
GEO
$4.15B
| $13.5M | 0.01% |
483,500
+9,400
| +2% | +$208K |
|
850
PUT
Tenet Healthcare
THC
$17.1B
| $13.5M | 0.01% |
107,100
-27,600
| -20% | -$4.1M |
|
Similar funds
Simplex Trading's Q4 2024 Portfolio in Review
As of Q4 2024, Simplex Trading held 10,008 positions worth $179B, up 4.8% from $170B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading's Q4 2024 filing shows 1,520 new, 3,222 increased, 3,616 reduced and 1,504 closed positions. Its largest new stake was Strategy Inc: 285,022 shares worth $82.5M. The largest sale was NVIDIA, an estimated $133M.
By sector, the portfolio is most concentrated in Technology at 0.68% of assets, up from 0.4% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q4 2024 buy was Strategy Inc: 285,022 shares worth $82.5M.
- Simplex Trading added most to Apple in Q4 2024, an estimated $552M increase.
- Simplex Trading's biggest Q4 2024 reduction was NVIDIA, cutting an estimated $133M.
- Simplex Trading fully exited Pinduoduo in Q4 2024, selling an estimated $82.6M.
- Simplex Trading's ten largest holdings make up 49% of its $179B portfolio in Q4 2024.
- Simplex Trading opened 1,520 new positions and closed 1,504 in Q4 2024.
- Simplex Trading's portfolio value rose 4.8% quarter-over-quarter to $179B.
Based on Simplex Trading's 13F filing for Q4 2024, filed 11 Feb 2025.