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
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3201
PUT
Sundial Growers
SNDL
$351M
| $669K | ﹤0.01% |
553,600
-66,600
| -11% | -$88.7K |
|
3202
CALL
Imperial Petroleum
IMPP
$217M
| $668K | ﹤0.01% |
217,200
-67,000
| -24% | -$184K |
|
3203
AdvisorShares Pure US Cannabis ETF
MSOS
$860M
| $668K | ﹤0.01% |
277,331
-34,078
| -11% | -$83.9K |
|
3204
CALL
CACI
CACI
$11B
| $667K | ﹤0.01% |
1,400
-300
| -18% | -$133K |
|
3205
CALL
Park Hotels & Resorts
PK
$3.03B
| $665K | ﹤0.01% |
65,100
+60,300
| +1,256% | +$614K |
|
3206
PUT
Cheesecake Factory
CAKE
$4.32B
| $664K | ﹤0.01% |
10,600
-1,300
| -11% | -$69.1K |
|
3207
PUT
Travere Therapeutics
TVTX
$5.27B
| $664K | ﹤0.01% |
44,900
+39,100
| +674% | +$648K |
|
3208
CALL
Xerox
XRX
$357M
| $663K | ﹤0.01% |
125,900
-8,500
| -6% | -$41.5K |
|
|
MOMO
3209
PUT
Hello Group
MOMO
$869M
| $662K | ﹤0.01% |
78,500
+5,400
| +7% | +$35.3K |
|
3210
CALL
Blue Owl Capital
OBDC
$5.42B
| $661K | ﹤0.01% |
46,100
+12,500
| +37% | +$178K |
|
3211
CALL
Nordic American Tanker
NAT
$1.37B
| $659K | ﹤0.01% |
250,700
+115,100
| +85% | +$300K |
|
3212
CALL
Natural Resource Partners
NRP
$1.3B
| $659K | ﹤0.01% |
6,900
+3,400
| +97% | +$331K |
|
3213
PUT
PagSeguro Digital
PAGS
$2.62B
| $659K | ﹤0.01% |
68,400
+28,400
| +71% | +$256K |
|
3214
CALL
Insulet
PODD
$11.4B
| $659K | ﹤0.01% |
2,100
-9,300
| -82% | -$2.68M |
|
3215
dLocal
DLO
$4.4B
| $658K | ﹤0.01% |
+58,025
| New | +$571K |
|
3216
CALL
EVgo
EVGO
$220M
| $657K | ﹤0.01% |
180,100
+134,000
| +291% | +$459K |
|
3217
CALL
Pentair
PNR
$10.2B
| $657K | ﹤0.01% |
6,400
-16,000
| -71% | -$1.49M |
|
3218
PUT
Vicor
VICR
$9.41B
| $657K | ﹤0.01% |
14,500
+12,300
| +559% | +$550K |
|
3219
PUT
Icahn Enterprises
IEP
$5.19B
| $656K | ﹤0.01% |
81,600
-26,700
| -25% | -$228K |
|
|
IRBT
3220
CALL
DELISTED
iRobot
IRBT
| $656K | ﹤0.01% |
209,700
+105,400
| +101% | +$291K |
|
3221
PUT
Public Service Enterprise Group
PEG
$39.5B
| $656K | ﹤0.01% |
7,800
+400
| +5% | +$32.3K |
|
3222
PUT
PubMatic
PUBM
$594M
| $656K | ﹤0.01% |
52,800
+39,900
| +309% | +$421K |
|
3223
Vanguard High Dividend Yield ETF
VYM
$81.3B
| $656K | ﹤0.01% |
4,927
-2,659
| -35% | -$337K |
|
3224
CALL
Group 1 Automotive
GPI
$4.01B
| $655K | ﹤0.01% |
1,500
-2,700
| -64% | -$1.13M |
|
|
NAK
3225
PUT
Northern Dynasty Minerals
NAK
$857M
| $654K | ﹤0.01% |
488,100
+338,000
| +225% | +$377K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.