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 |
NVIDIA
NVDA
|
+$93M |
| 2 |
Citigroup
C
|
+$74.8M |
| 3 |
Pinduoduo
PDD
|
+$50.7M |
| 4 |
Intel
INTC
|
+$47.1M |
| 5 |
Broadcom
AVGO
|
+$46.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street Energy Select Sector SPDR ETF
XLE
|
+$94.5M |
| 2 |
Pfizer
PFE
|
+$66.4M |
| 3 |
Boeing
BA
|
+$61.6M |
| 4 |
PayPal
PYPL
|
+$42.2M |
| 5 |
GE Aerospace
GE
|
+$42M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.53% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.21% |
| 4 | Financials | 0.2% |
| 5 | Materials | 0.12% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3251
CALL
OSI Systems
OSIS
$3.58B
| $728K | ﹤0.01% |
5,300
+4,900
| +1,225% | +$675K |
|
3252
iShares MSCI India ETF
INDA
$6.77B
| $727K | ﹤0.01% |
13,051
-120,065
| -90% | -$6.36M |
|
3253
Shoals Technologies Group
SHLS
$1.57B
| $727K | ﹤0.01% |
116,521
+69,050
| +145% | +$551K |
|
3254
ProShares Short Bitcoin Strategy ETF
BITI
$103M
| $725K | ﹤0.01% |
17,151
-7,380
| -30% | -$290K |
|
3255
CALL
Edison International
EIX
$30.3B
| $725K | ﹤0.01% |
10,100
-9,000
| -47% | -$652K |
|
3256
PUT
Red Rock Resorts
RRR
$3.8B
| $725K | ﹤0.01% |
13,200
+11,800
| +843% | +$640K |
|
|
SWTX
3257
PUT
DELISTED
SpringWorks Therapeutics
SWTX
| $723K | ﹤0.01% |
19,200
+18,700
| +3,740% | +$787K |
|
3258
PUT
Navient
NAVI
$809M
| $722K | ﹤0.01% |
49,600
+22,400
| +82% | +$346K |
|
3259
ProShares Short VIX Short-Term Futures ETF
SVXY
$223M
| $722K | ﹤0.01% |
+11,766
| New | +$678K |
|
3260
CALL
Iridium Communications
IRDM
$4.87B
| $721K | ﹤0.01% |
27,100
-17,500
| -39% | -$493K |
|
3261
CALL
Impinj
PI
$3.97B
| $721K | ﹤0.01% |
4,600
-25,300
| -85% | -$3.76M |
|
3262
CALL
Arcutis Biotherapeutics
ARQT
$3.48B
| $720K | ﹤0.01% |
77,500
+6,200
| +9% | +$56.1K |
|
|
DAWN
3263
PUT
DELISTED
Day One Biopharmaceuticals
DAWN
| $720K | ﹤0.01% |
52,300
+39,800
| +318% | +$582K |
|
3264
CALL
Haemonetics
HAE
$3.63B
| $719K | ﹤0.01% |
8,700
-300
| -3% | -$26.4K |
|
3265
Transmedics
TMDX
$2.57B
| $718K | ﹤0.01% |
4,771
+2,220
| +87% | +$266K |
|
3266
CALL
Boise Cascade
BCC
$2.75B
| $715K | ﹤0.01% |
6,000
-700
| -10% | -$95K |
|
3267
CALL
Knife River
KNF
$4.46B
| $715K | ﹤0.01% |
10,200
+8,100
| +386% | +$605K |
|
3268
CALL
PTC Therapeutics
PTCT
$6.29B
| $715K | ﹤0.01% |
23,400
+22,000
| +1,571% | +$713K |
|
|
AZPN
3269
PUT
DELISTED
Aspen Technology Inc
AZPN
| $715K | ﹤0.01% |
3,600
+100
| +3% | +$20.5K |
|
3270
CALL
AGCO
AGCO
$8.71B
| $714K | ﹤0.01% |
7,300
-41,200
| -85% | -$4.59M |
|
3271
PUT
SIGA Technologies
SIGA
$222M
| $714K | ﹤0.01% |
94,100
-37,000
| -28% | -$301K |
|
3272
CoinShares ETF Trust CoinShares Bitcoin Mining ETF
WGMI
$254M
| $712K | ﹤0.01% |
33,678
-7,174
| -18% | -$123K |
|
3273
Recursion Pharmaceuticals
RXRX
$1.6B
| $710K | ﹤0.01% |
94,772
+58,556
| +162% | +$511K |
|
3274
CALL
Janux Therapeutics
JANX
$950M
| $707K | ﹤0.01% |
16,900
+10,100
| +149% | +$474K |
|
3275
PUT
Marriott Vacations Worldwide
VAC
$3.4B
| $707K | ﹤0.01% |
8,100
-47,100
| -85% | -$4.47M |
|
Similar funds
Simplex Trading's Q2 2024 Portfolio in Review
As of Q2 2024, Simplex Trading held 10,213 positions worth $162B, down 6.5% from $173B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading withdrew a net $19.2B in Q2 2024, closing 1,431 positions and reducing 4,061 holdings. Its most notable exit was Boeing, an estimated $61.6M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.53% of assets, up from 0.38% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Citigroup worth $77M.
- Simplex Trading's largest Q2 2024 buy was Citigroup: 1,213,247 shares worth $77M.
- Simplex Trading added most to NVIDIA in Q2 2024, an estimated $93M increase.
- Simplex Trading's biggest Q2 2024 reduction was State Street Energy Select Sector SPDR ETF, cutting an estimated $94.5M.
- Simplex Trading fully exited Boeing in Q2 2024, selling an estimated $61.6M.
- Simplex Trading's ten largest holdings make up 50% of its $162B portfolio in Q2 2024.
- Simplex Trading opened 1,358 new positions and closed 1,431 in Q2 2024.
- Simplex Trading's portfolio value fell 6.5% quarter-over-quarter to $162B.
Based on Simplex Trading's 13F filing for Q2 2024, filed 25 Jul 2024.