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 | |
|---|---|---|---|---|---|---|
4726
PUT
Zurn Elkay Water Solutions
ZWS
$8.55B
| $160K | ﹤0.01% |
4,300
+3,500
| +438% | +$133K |
|
|
AWTM
4727
PUT
DELISTED
AWTM Ultra-Short Duration Enhanced Income ETF
AWTM
| $160K | ﹤0.01% |
+11,400
| New | +$160K |
|
4728
CALL
Cedar Fair
FUN
$1.88B
| $159K | ﹤0.01% |
3,300
-5,500
| -63% | -$241K |
|
4729
PUT
Keros Therapeutics
KROS
$197M
| $159K | ﹤0.01% |
10,100
+10,000
| +10,000% | +$520K |
|
4730
CALL
Alliant Energy
LNT
$18.6B
| $159K | ﹤0.01% |
2,700
-3,800
| -58% | -$230K |
|
|
SOND
4731
CALL
DELISTED
Sonder
SOND
| $159K | ﹤0.01% |
193,900
-5,600
| -3% | -$19.8K |
|
4732
CALL
Telesat
TSAT
$524M
| $159K | ﹤0.01% |
+9,700
| New | +$135K |
|
4733
PUT
ABM Industries
ABM
$2.89B
| $158K | ﹤0.01% |
3,100
-3,400
| -52% | -$185K |
|
4734
PUT
Alkermes
ALKS
$8.11B
| $158K | ﹤0.01% |
5,500
+4,300
| +358% | +$124K |
|
4735
PUT
FormFactor
FORM
$6.51B
| $158K | ﹤0.01% |
+3,600
| New | +$155K |
|
|
FNUC
4736
CALL
Frontier Nuclear and Minerals Inc
FNUC
$38.7M
| $158K | ﹤0.01% |
+12,662
| New | +$54K |
|
|
MOMO
4737
PUT
Hello Group
MOMO
$867M
| $158K | ﹤0.01% |
81,400
+6,800
| +9% | +$48.3K |
|
4738
CALL
NewMarket
NEU
$7.24B
| $158K | ﹤0.01% |
300
-700
| -70% | -$375K |
|
4739
CALL
Playboy Inc
PLBY
$136M
| $158K | ﹤0.01% |
108,700
+97,100
| +837% | +$112K |
|
4740
Riskified
RSKD
$719M
| $158K | ﹤0.01% |
33,559
-1,503
| -4% | -$6.97K |
|
|
SRDX
4741
PUT
DELISTED
Surmodics
SRDX
| $158K | ﹤0.01% |
4,000
-1,000
| -20% | -$38.9K |
|
4742
CALL
ITT
ITT
$17.1B
| $157K | ﹤0.01% |
1,100
-2,800
| -72% | -$419K |
|
4743
MarketAxess Holdings
MKTX
$4.47B
| $157K | ﹤0.01% |
+697
| New | +$183K |
|
4744
PUT
Nexstar Media Group
NXST
$6.01B
| $157K | ﹤0.01% |
1,000
-600
| -38% | -$101K |
|
4745
PUT
Rush Street Interactive
RSI
$3.17B
| $157K | ﹤0.01% |
11,500
-3,300
| -22% | -$40.1K |
|
|
NARI
4746
DELISTED
Inari Medical, Inc. Common Stock
NARI
| $157K | ﹤0.01% |
+3,085
| New | +$152K |
|
4747
CALL
Cerus
CERS
$575M
| $156K | ﹤0.01% |
101,400
+62,700
| +162% | +$108K |
|
4748
CALL
MarineMax
HZO
$748M
| $156K | ﹤0.01% |
5,400
+1,600
| +42% | +$49.1K |
|
4749
CALL
Krystal Biotech
KRYS
$10.7B
| $156K | ﹤0.01% |
1,000
-8,100
| -89% | -$1.44M |
|
4750
CALL
Willis Towers Watson
WTW
$29.8B
| $156K | ﹤0.01% |
500
-3,600
| -88% | -$1.1M |
|
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.