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 | |
|---|---|---|---|---|---|---|
6276
Titan International
TWI
$492M
| $35K | ﹤0.01% |
3,499
-1,704
| -33% | -$13.1K |
|
6277
Upland Software
UPLD
$13.3M
| $35K | ﹤0.01% |
+1,832
| New | +$40.8K |
|
6278
Telefônica Brasil
VIV
$20.4B
| $35K | ﹤0.01% |
+3,142
| New | +$30.9K |
|
6279
CALL
Exagen
XGN
$105M
| $35K | ﹤0.01% |
5,100
+3,300
| +183% | +$20.1K |
|
|
AIOT
6280
PowerFleet Inc
AIOT
$537M
| $35K | ﹤0.01% |
8,312
-28,963
| -78% | -$143K |
|
6281
Ardmore Shipping
ASC
$683M
| $34K | ﹤0.01% |
3,553
-4,130
| -54% | -$39.8K |
|
6282
CALL
Backblaze
BLZE
$683M
| $34K | ﹤0.01% |
6,200
-2,500
| -29% | -$12.7K |
|
6283
Celularity
CELU
$19.4M
| $34K | ﹤0.01% |
17,404
+6,498
| +60% | +$11.8K |
|
6284
CPS Technologies
CPSH
$67.6M
| $34K | ﹤0.01% |
12,442
+6,325
| +103% | +$13.5K |
|
6285
CALL
Erie Indemnity
ERIE
$13B
| $34K | ﹤0.01% |
100
-100
| -50% | -$37.1K |
|
6286
CALL
Expeditors International
EXPD
$22.3B
| $34K | ﹤0.01% |
300
-1,400
| -82% | -$157K |
|
6287
4D Molecular Therapeutics
FDMT
$502M
| $34K | ﹤0.01% |
9,361
+5,048
| +117% | +$17.7K |
|
6288
GraniteShares HIPS US High Income ETF
HIPS
$110M
| $34K | ﹤0.01% |
2,860
+2,295
| +406% | +$27.6K |
|
6289
iShares S&P Small-Cap 600 Value ETF
IJS
$8.12B
| $34K | ﹤0.01% |
+348
| New | +$32.9K |
|
6290
The Joint Corp
JYNT
$119M
| $34K | ﹤0.01% |
+2,962
| New | +$31.7K |
|
6291
PUT
Kirby Corp
KEX
$7.01B
| $34K | ﹤0.01% |
300
+100
| +50% | +$10.5K |
|
6292
PUT
Limoneira
LMNR
$244M
| $34K | ﹤0.01% |
+2,200
| New | +$34.8K |
|
6293
Lincoln National
LNC
$7.92B
| $34K | ﹤0.01% |
1,002
-73,475
| -99% | -$2.4M |
|
6294
CALL
OFS Capital
OFS
$46.2M
| $34K | ﹤0.01% |
4,100
-7,000
| -63% | -$60.2K |
|
6295
CALL
Penske Automotive Group
PAG
$14.7B
| $34K | ﹤0.01% |
200
-100
| -33% | -$16K |
|
6296
CALL
The RMR Group
RMR
$335M
| $34K | ﹤0.01% |
2,100
| – | – |
|
6297
PUT
Rogers Corp
ROG
$2.09B
| $34K | ﹤0.01% |
+500
| New | +$32.2K |
|
6298
PUT
Waters Corp
WAT
$37.3B
| $34K | ﹤0.01% |
100
| – | – |
|
6299
PUT
Workiva
WK
$3.45B
| $34K | ﹤0.01% |
500
| – | – |
|
|
CAI
6300
PUT
Caris Life Sciences
CAI
$4.41B
| $34K | ﹤0.01% |
+1,300
| New | +$35K |
|
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.