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 | |
|---|---|---|---|---|---|---|
3701
PUT
Innoviz Technologies
INVZ
$99.1M
| $431K | ﹤0.01% |
256,600
-19,100
| -7% | -$15.8K |
|
3702
PUT
Warner Music
WMG
$14.8B
| $430K | ﹤0.01% |
13,900
+13,200
| +1,886% | +$422K |
|
|
TOPT
3703
iShares Top 20 U.S. Stocks ETF
TOPT
$654M
| $430K | ﹤0.01% |
+16,511
| New | +$424K |
|
3704
Invesco CurrencyShares Japanese Yen Trust
FXY
$425M
| $429K | ﹤0.01% |
7,327
-64,644
| -90% | -$3.92M |
|
3705
CALL
Mueller Water Products
MWA
$4.07B
| $429K | ﹤0.01% |
19,100
+18,900
| +9,450% | +$444K |
|
3706
CALL
Blackbaud
BLKB
$1.65B
| $428K | ﹤0.01% |
5,800
+5,600
| +2,800% | +$458K |
|
3707
Fastly Inc
FSLY
$3.06B
| $428K | ﹤0.01% |
45,356
-71,973
| -61% | -$598K |
|
3708
PUT
PAR Technology
PAR
$695M
| $428K | ﹤0.01% |
5,900
-2,200
| -27% | -$150K |
|
3709
CALL
HEICO Corp Class A
HEI.A
$36.4B
| $427K | ﹤0.01% |
1,800
-11,700
| -87% | -$2.36M |
|
3710
Madison Square Garden
MSGS
$9.66B
| $427K | ﹤0.01% |
1,895
+1,377
| +266% | +$307K |
|
3711
PUT
McEwen Inc
MUX
$1.01B
| $427K | ﹤0.01% |
54,900
-105,200
| -66% | -$951K |
|
3712
PUT
Blackstone Secured Lending
BXSL
$5.37B
| $426K | ﹤0.01% |
13,200
-38,700
| -75% | -$1.21M |
|
|
SMLR
3713
DELISTED
Semler Scientific
SMLR
| $426K | ﹤0.01% |
+7,905
| New | +$363K |
|
3714
CALL
Sundial Growers
SNDL
$328M
| $426K | ﹤0.01% |
238,100
+58,200
| +32% | +$114K |
|
|
LB
3715
CALL
LandBridge Co
LB
$2.07B
| $426K | ﹤0.01% |
+6,600
| New | +$396K |
|
3716
CALL
Dole
DOLE
$1.37B
| $425K | ﹤0.01% |
31,400
+30,600
| +3,825% | +$470K |
|
3717
Globus Medical
GMED
$10.9B
| $424K | ﹤0.01% |
5,137
+2,849
| +125% | +$225K |
|
3718
PUT
Arvinas
ARVN
$525M
| $423K | ﹤0.01% |
22,100
+20,800
| +1,600% | +$505K |
|
3719
PUT
Byrna Technologies
BYRN
$93.3M
| $423K | ﹤0.01% |
14,700
+10,200
| +227% | +$200K |
|
3720
PUT
Customers Bancorp
CUBI
$2.67B
| $423K | ﹤0.01% |
8,700
-1,600
| -16% | -$80.4K |
|
3721
PUT
Companhia Siderúrgica Nacional
SID
$1.47B
| $423K | ﹤0.01% |
294,100
+287,900
| +4,644% | +$564K |
|
3722
PUT
Wendy's
WEN
$1.4B
| $423K | ﹤0.01% |
26,000
-45,900
| -64% | -$838K |
|
3723
CALL
Calix
CALX
$2.32B
| $421K | ﹤0.01% |
12,100
-28,700
| -70% | -$1.01M |
|
3724
PUT
Acadia Pharmaceuticals
ACAD
$4.41B
| $420K | ﹤0.01% |
22,900
+6,100
| +36% | +$98.5K |
|
3725
CALL
Sturm, Ruger & Co
RGR
$626M
| $420K | ﹤0.01% |
11,900
-59,400
| -83% | -$2.31M |
|
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.