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 | |
|---|---|---|---|---|---|---|
|
CMPS
6751
CALL
Compass Pathways
CMPS
$1.56B
| $18K | ﹤0.01% |
5,000
-12,400
| -71% | -$62.9K |
|
6752
Amplify Seymour Cannabis ETF
CNBS
$71.1M
| $18K | ﹤0.01% |
751
+392
| +109% | +$17.1K |
|
6753
CALL
Castle Biosciences
CSTL
$813M
| $18K | ﹤0.01% |
700
-1,000
| -59% | -$30.5K |
|
6754
Evolus
EOLS
$396M
| $18K | ﹤0.01% |
+1,678
| New | +$23.6K |
|
6755
PUT
Erasca
ERAS
$6.48B
| $18K | ﹤0.01% |
7,500
-25,300
| -77% | -$69.4K |
|
6756
CALL
Franklin Covey
FC
$243M
| $18K | ﹤0.01% |
+500
| New | +$19.2K |
|
6757
CALL
Gray Television
GTN
$417M
| $18K | ﹤0.01% |
6,000
-29,500
| -83% | -$138K |
|
6758
PUT
Harvard Bioscience
HBIO
$27.5M
| $18K | ﹤0.01% |
870
+100
| +13% | +$2.3K |
|
6759
CALL
Imperial Oil
IMO
$62.3B
| $18K | ﹤0.01% |
300
+200
| +200% | +$14.5K |
|
6760
iShares US Industrials ETF
IYJ
$1.97B
| $18K | ﹤0.01% |
+141
| New | +$19.4K |
|
6761
CALL
JELD-WEN Holding
JELD
$117M
| $18K | ﹤0.01% |
2,300
+2,200
| +2,200% | +$26.5K |
|
6762
Lands' End
LE
$369M
| $18K | ﹤0.01% |
+1,399
| New | +$21.9K |
|
6763
PUT
Lincoln Electric
LECO
$13.7B
| $18K | ﹤0.01% |
+100
| New | +$20.1K |
|
6764
AdvisorShares MSOS 2X Daily ETF
MSOX
$49.4M
| $18K | ﹤0.01% |
2,055
-1,194
| -37% | -$30.4K |
|
|
NINE
6765
CALL
DELISTED
Nine Energy Service
NINE
| $18K | ﹤0.01% |
16,800
+11,000
| +190% | +$13K |
|
|
PDS
6766
PUT
Precision Drilling
PDS
$979M
| $18K | ﹤0.01% |
+300
| New | +$18.4K |
|
6767
PUT
ProQR Therapeutics
PRQR
$251M
| $18K | ﹤0.01% |
6,900
+5,000
| +263% | +$15.9K |
|
|
REFI
6768
PUT
Chicago Atlantic Real Estate Finance
REFI
$249M
| $18K | ﹤0.01% |
1,200
| – | – |
|
6769
PUT
Regenxbio
RGNX
$648M
| $18K | ﹤0.01% |
2,400
-600
| -20% | -$5.63K |
|
6770
Resources Connection
RGP
$147M
| $18K | ﹤0.01% |
2,188
+2,052
| +1,509% | +$17.3K |
|
6771
CALL
Rezolute
RZLT
$470M
| $18K | ﹤0.01% |
3,800
-3,100
| -45% | -$15.6K |
|
|
SEVN
6772
Seven Hills Realty Trust
SEVN
$171M
| $18K | ﹤0.01% |
1,405
+224
| +19% | +$2.99K |
|
6773
PUT
SkinHealth Systems
SKIN
$87.6M
| $18K | ﹤0.01% |
11,700
-15,100
| -56% | -$23.7K |
|
|
FIRY
6774
PUT
Firy Inc
FIRY
$152M
| $18K | ﹤0.01% |
53,700
-4,800
| -8% | -$25.6K |
|
6775
PUT
SPS Commerce
SPSC
$2.42B
| $18K | ﹤0.01% |
100
| – | – |
|
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.