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 | |
|---|---|---|---|---|---|---|
4501
PUT
Ramaco Resources Class A
METC
$622M
| $202K | ﹤0.01% |
20,160
-55,602
| -73% | -$618K |
|
4502
PUT
Old Republic International
ORI
$10.8B
| $202K | ﹤0.01% |
5,600
+5,200
| +1,300% | +$190K |
|
4503
Pegasystems
PEGA
$5.08B
| $202K | ﹤0.01% |
+4,348
| New | +$186K |
|
4504
CALL
Photronics
PLAB
$1.66B
| $202K | ﹤0.01% |
8,600
-25,000
| -74% | -$612K |
|
4505
PUT
Redwire
RDW
$1.86B
| $202K | ﹤0.01% |
12,300
+10,400
| +547% | +$112K |
|
|
CBL
4506
CALL
DELISTED
CBL& Associates Properties, Inc.
CBL
| $202K | ﹤0.01% |
6,900
-3,400
| -33% | -$99.5K |
|
4507
PUT
Apple Hospitality REIT
APLE
$3.96B
| $201K | ﹤0.01% |
13,100
-13,000
| -50% | -$201K |
|
4508
CALL
Federal Realty Investment Trust
FRT
$10.8B
| $201K | ﹤0.01% |
1,800
+300
| +20% | +$33.9K |
|
4509
CALL
ICU Medical
ICUI
$4.15B
| $201K | ﹤0.01% |
1,300
-1,200
| -48% | -$203K |
|
4510
CALL
Saic
SAIC
$4.96B
| $201K | ﹤0.01% |
1,800
+1,300
| +260% | +$172K |
|
4511
BRC Inc
BRCC
$123M
| $200K | ﹤0.01% |
+63,205
| New | +$198K |
|
4512
PUT
Golub Capital BDC
GBDC
$3.33B
| $200K | ﹤0.01% |
13,200
+3,300
| +33% | +$50.4K |
|
4513
PUT
Goldman Sachs BDC
GSBD
$992M
| $200K | ﹤0.01% |
16,600
+16,200
| +4,050% | +$213K |
|
4514
PUT
The Honest Company
HNST
$411M
| $200K | ﹤0.01% |
29,000
+27,600
| +1,971% | +$156K |
|
4515
CALL
Mid-America Apartment Communities
MAA
$16B
| $200K | ﹤0.01% |
1,300
-1,400
| -52% | -$219K |
|
4516
ProShares UltraPro Short 20+ Year Treasury
TTT
$18.9M
| $200K | ﹤0.01% |
2,503
+397
| +19% | +$28.3K |
|
4517
CALL
Pediatrix Medical
MD
$2.18B
| $199K | ﹤0.01% |
15,200
+12,600
| +485% | +$174K |
|
4518
CALL
RenaissanceRe
RNR
$13.8B
| $199K | ﹤0.01% |
800
-3,600
| -82% | -$967K |
|
|
ONIT
4519
Onity Group
ONIT
$345M
| $199K | ﹤0.01% |
+6,508
| New | +$201K |
|
4520
PUT
Aemetis
AMTX
$101M
| $198K | ﹤0.01% |
73,800
+29,600
| +67% | +$93K |
|
4521
CALL
Avnet
AVT
$6.89B
| $198K | ﹤0.01% |
3,800
+1,900
| +100% | +$103K |
|
4522
Burford Capital
BUR
$914M
| $198K | ﹤0.01% |
15,538
-16,627
| -52% | -$223K |
|
4523
WisdomTree Japan Hedged Equity Fund
DXJ
$7.07B
| $198K | ﹤0.01% |
1,797
-23,317
| -93% | -$2.55M |
|
4524
Ecolab
ECL
$79.5B
| $198K | ﹤0.01% |
+848
| New | +$211K |
|
4525
Garrett Motion
GTX
$5.44B
| $198K | ﹤0.01% |
21,961
+21,157
| +2,631% | +$176K |
|
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.