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 | |
|---|---|---|---|---|---|---|
4951
CALL
McEwen Inc
MUX
$1.06B
| $127K | ﹤0.01% |
16,400
-5,700
| -26% | -$51.5K |
|
|
TGB
4952
CALL
Trekor Metals
TGB
$2.59B
| $127K | ﹤0.01% |
65,500
-15,500
| -19% | -$34.2K |
|
4953
ProShares UltraShort Yen
YCS
$30.1M
| $127K | ﹤0.01% |
2,741
-1,081
| -28% | -$47.8K |
|
4954
CALL
AMN Healthcare
AMN
$1.35B
| $126K | ﹤0.01% |
5,300
-200
| -4% | -$6.35K |
|
4955
PUT
Amplify Energy
AMPY
$155M
| $126K | ﹤0.01% |
21,000
-17,000
| -45% | -$111K |
|
4956
PUT
iRadimed
IRMD
$1.22B
| $126K | ﹤0.01% |
+2,300
| New | +$121K |
|
4957
Unusual Whales Subversive Democratic Trading ETF
NANC
$274M
| $126K | ﹤0.01% |
3,283
+1,076
| +49% | +$41.9K |
|
4958
PUT
Atea Pharmaceuticals
AVIR
$379M
| $125K | ﹤0.01% |
37,600
-117,200
| -76% | -$389K |
|
|
BAND
4959
CALL
Bandwidth Inc
BAND
$1.25B
| $125K | ﹤0.01% |
7,400
-30,100
| -80% | -$565K |
|
|
DHC
4960
CALL
Diversified Healthcare Trust
DHC
$2.17B
| $125K | ﹤0.01% |
54,600
+9,200
| +20% | +$27.1K |
|
4961
CALL
Hubbell
HUBB
$25B
| $125K | ﹤0.01% |
300
-400
| -57% | -$179K |
|
4962
CALL
Nordson
NDSN
$16.4B
| $125K | ﹤0.01% |
600
-1,300
| -68% | -$321K |
|
4963
CALL
O-I Glass
OI
$1.13B
| $125K | ﹤0.01% |
11,600
-76,700
| -87% | -$932K |
|
4964
PDF Solutions
PDFS
$1.93B
| $125K | ﹤0.01% |
+4,643
| New | +$140K |
|
|
BECN
4965
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $125K | ﹤0.01% |
+1,236
| New | +$125K |
|
4966
CALL
Accel Entertainment
ACEL
$973M
| $124K | ﹤0.01% |
11,700
-9,900
| -46% | -$113K |
|
4967
CALL
Century Communities
CCS
$1.95B
| $124K | ﹤0.01% |
1,700
+1,200
| +240% | +$107K |
|
4968
Cellebrite
CLBT
$3.63B
| $124K | ﹤0.01% |
5,639
-4,757
| -46% | -$91.6K |
|
4969
iShares S&P GSCI Commodity-Indexed Trust
GSG
$995M
| $124K | ﹤0.01% |
5,734
-736
| -11% | -$15.7K |
|
|
NOTV
4970
PUT
DELISTED
Inotiv
NOTV
| $124K | ﹤0.01% |
30,100
+25,300
| +527% | +$76.3K |
|
|
SA
4971
PUT
Seabridge Gold
SA
$2.89B
| $124K | ﹤0.01% |
10,900
-115,000
| -91% | -$1.77M |
|
4972
ProShares UltraShort Financials
SKF
$10.2M
| $124K | ﹤0.01% |
+3,546
| New | +$127K |
|
4973
SPS Commerce
SPSC
$2.42B
| $124K | ﹤0.01% |
+679
| New | +$127K |
|
4974
CALL
Teradata
TDC
$2.88B
| $124K | ﹤0.01% |
4,000
-4,400
| -52% | -$138K |
|
4975
CALL
Trex
TREX
$4.56B
| $124K | ﹤0.01% |
1,800
-5,700
| -76% | -$402K |
|
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.