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 | |
|---|---|---|---|---|---|---|
3601
CALL
American Water Works
AWK
$26.3B
| $473K | ﹤0.01% |
3,800
-4,900
| -56% | -$661K |
|
3602
Carriage Services
CSV
$635M
| $473K | ﹤0.01% |
11,885
-25,258
| -68% | -$932K |
|
3603
Liquidia Corp
LQDA
$7.51B
| $473K | ﹤0.01% |
40,234
+26,672
| +197% | +$292K |
|
3604
PUT
MaxLinear
MXL
$5.88B
| $472K | ﹤0.01% |
23,900
-14,500
| -38% | -$233K |
|
3605
PUT
Packaging Corp of America
PKG
$22.5B
| $472K | ﹤0.01% |
2,100
| – | – |
|
3606
Repligen
RGEN
$7.39B
| $472K | ﹤0.01% |
3,281
-876
| -21% | -$126K |
|
3607
PUT
Arch Capital
ACGL
$36.3B
| $470K | ﹤0.01% |
5,100
-2,000
| -28% | -$202K |
|
3608
CALL
Cardiff Oncology
CRDF
$65M
| $470K | ﹤0.01% |
108,500
+103,600
| +2,114% | +$324K |
|
3609
Structure Therapeutics
GPCR
$3.46B
| $470K | ﹤0.01% |
17,346
-3,913
| -18% | -$139K |
|
3610
Manchester United
MANU
$3.96B
| $470K | ﹤0.01% |
27,114
+10,339
| +62% | +$174K |
|
3611
Sibanye-Stillwater
SBSW
$6.05B
| $470K | ﹤0.01% |
142,581
-37,065
| -21% | -$156K |
|
3612
PUT
Idacorp
IDA
$8.2B
| $469K | ﹤0.01% |
4,300
+3,800
| +760% | +$418K |
|
|
3613
MaxLinear
MXL
$5.88B
| $468K | ﹤0.01% |
23,684
-2,130
| -8% | -$34.2K |
|
3614
PUT
Brookfield Renewable
BEP
$9.74B
| $467K | ﹤0.01% |
20,500
+16,500
| +413% | +$421K |
|
3615
Lantheus
LNTH
$7.03B
| $467K | ﹤0.01% |
5,229
-14,063
| -73% | -$1.37M |
|
3616
CALL
Roper Technologies
ROP
$37.1B
| $467K | ﹤0.01% |
900
-2,000
| -69% | -$1.1M |
|
3617
CALL
Essential Properties Realty Trust
EPRT
$6.9B
| $466K | ﹤0.01% |
14,900
+14,300
| +2,383% | +$469K |
|
3618
CALL
Mercury Systems
MRCY
$6.23B
| $466K | ﹤0.01% |
11,100
-1,600
| -13% | -$61K |
|
3619
CALL
Brunswick
BC
$5.24B
| $465K | ﹤0.01% |
7,200
+3,500
| +95% | +$274K |
|
3620
CALL
The Ensign Group
ENSG
$10.4B
| $465K | ﹤0.01% |
3,500
-700
| -17% | -$102K |
|
3621
CALL
Taboola.com
TBLA
$1.35B
| $464K | ﹤0.01% |
127,300
+46,600
| +58% | +$166K |
|
3622
Ginkgo Bioworks
DNA
$487M
| $462K | ﹤0.01% |
+47,103
| New | +$404K |
|
3623
PUT
Nordic American Tanker
NAT
$1.37B
| $462K | ﹤0.01% |
184,900
+128,300
| +227% | +$394K |
|
3624
TAL Education Group
TAL
$5.86B
| $462K | ﹤0.01% |
46,129
-78,066
| -63% | -$820K |
|
3625
Crane Co
CR
$13.1B
| $461K | ﹤0.01% |
+3,038
| New | +$501K |
|
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.