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 | |
|---|---|---|---|---|---|---|
4776
CALL
Exponent
EXPO
$3.19B
| $151K | ﹤0.01% |
1,700
-500
| -23% | -$50.4K |
|
|
GRFS
4777
Grifois
GRFS
$5.55B
| $151K | ﹤0.01% |
20,373
-59,709
| -75% | -$499K |
|
4778
PUT
ProPetro Holding
PUMP
$1.25B
| $151K | ﹤0.01% |
16,200
+15,000
| +1,250% | +$123K |
|
4779
CALL
Tenaya Therapeutics
TNYA
$160M
| $151K | ﹤0.01% |
+105,900
| New | +$237K |
|
4780
Valens Semiconductor
VLN
$160M
| $151K | ﹤0.01% |
58,151
+51,151
| +731% | +$102K |
|
|
BWIN
4781
CALL
Baldwin Insurance Group
BWIN
$2.75B
| $151K | ﹤0.01% |
3,900
-6,300
| -62% | -$294K |
|
4782
Annexon
ANNX
$796M
| $150K | ﹤0.01% |
29,433
+3,603
| +14% | +$22.2K |
|
4783
Atlanta Braves Holdings Series B
BATRK
$3.28B
| $150K | ﹤0.01% |
+3,944
| New | +$157K |
|
4784
CALL
Broadstone Net Lease
BNL
$4.25B
| $150K | ﹤0.01% |
9,500
-11,400
| -55% | -$199K |
|
4785
PUT
EXL Service
EXLS
$5.46B
| $150K | ﹤0.01% |
3,400
-2,300
| -40% | -$99.5K |
|
|
INN
4786
Summit Hotel Properties
INN
$766M
| $150K | ﹤0.01% |
22,015
+17,435
| +381% | +$115K |
|
4787
Defiance R2000 Weekly Distribution ETF
IWMY
$95.4M
| $150K | ﹤0.01% |
+5,029
| New | +$166K |
|
4788
Array Technologies
ARRY
$740M
| $149K | ﹤0.01% |
24,731
-77,957
| -76% | -$497K |
|
4789
PUT
Check Point Software Technologies
CHKP
$14.3B
| $149K | ﹤0.01% |
800
-26,800
| -97% | -$5.05M |
|
4790
PUT
JFrog
FROG
$8.88B
| $149K | ﹤0.01% |
5,100
-4,700
| -48% | -$143K |
|
4791
PUT
nVent Electric
NVT
$21.6B
| $149K | ﹤0.01% |
2,200
-600
| -21% | -$44.2K |
|
4792
CALL
Sempra
SRE
$58.1B
| $149K | ﹤0.01% |
1,700
-18,300
| -92% | -$1.6M |
|
4793
Verra Mobility
VRRM
$775M
| $149K | ﹤0.01% |
+6,200
| New | +$154K |
|
|
EQC
4794
CALL
DELISTED
Equity Commonwealth
EQC
| $149K | ﹤0.01% |
84,700
+32,800
| +63% | +$505K |
|
4795
CALL
DLH Holdings
DLHC
$78.3M
| $148K | ﹤0.01% |
18,500
+16,400
| +781% | +$137K |
|
|
GRFS
4796
CALL
Grifois
GRFS
$5.55B
| $148K | ﹤0.01% |
20,000
-278,200
| -93% | -$2.32M |
|
|
MASI
4797
CALL
DELISTED
Masimo
MASI
| $148K | ﹤0.01% |
900
-10,600
| -92% | -$1.67M |
|
4798
Pacific Biosciences
PACB
$435M
| $148K | ﹤0.01% |
+81,022
| New | +$158K |
|
4799
CALL
ARS Pharmaceuticals
SPRY
$579M
| $148K | ﹤0.01% |
14,100
-20,200
| -59% | -$283K |
|
4800
PUT
Green Plains
GPRE
$1.15B
| $147K | ﹤0.01% |
15,600
-164,800
| -91% | -$1.86M |
|
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.