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 | |
|---|---|---|---|---|---|---|
4426
CALL
TFS Financial
TFSL
$5.11B
| $216K | ﹤0.01% |
16,700
+15,600
| +1,418% | +$201K |
|
4427
PUT
Tennant Co
TNC
$1.44B
| $216K | ﹤0.01% |
2,800
+1,300
| +87% | +$96K |
|
|
MAGN
4428
CALL
Magnera Corp
MAGN
$493M
| $216K | ﹤0.01% |
17,900
-50,800
| -74% | -$699K |
|
4429
Fulgent Genetics
FLGT
$558M
| $215K | ﹤0.01% |
10,821
+8,855
| +450% | +$173K |
|
4430
CALL
FNB Corp
FNB
$6.76B
| $215K | ﹤0.01% |
14,800
+7,600
| +106% | +$103K |
|
4431
GoodRx Holdings
GDRX
$1.09B
| $215K | ﹤0.01% |
43,293
+12,779
| +42% | +$55.5K |
|
4432
CALL
NovaGold Resources
NG
$2.54B
| $215K | ﹤0.01% |
52,600
+44,600
| +558% | +$167K |
|
4433
PUT
US Foods
USFD
$22.5B
| $215K | ﹤0.01% |
2,800
-14,800
| -84% | -$1.06M |
|
4434
CALL
American States Water
AWR
$3.44B
| $214K | ﹤0.01% |
2,800
+2,200
| +367% | +$173K |
|
|
GTLS
4435
PUT
DELISTED
Chart Industries
GTLS
| $214K | ﹤0.01% |
1,300
-11,500
| -90% | -$1.69M |
|
|
MAXN
4436
PUT
DELISTED
Maxeon Solar Technologies
MAXN
| $214K | ﹤0.01% |
70,000
-12,000
| -15% | -$37.3K |
|
4437
CALL
Transcat
TRNS
$760M
| $214K | ﹤0.01% |
+2,500
| New | +$204K |
|
4438
PUT
Edgewise Therapeutics
EWTX
$4.28B
| $213K | ﹤0.01% |
16,300
-23,600
| -59% | -$340K |
|
4439
Teucrium Soybean Fund
SOYB
$61.1M
| $211K | ﹤0.01% |
9,731
+7,151
| +277% | +$156K |
|
4440
PUT
Bausch + Lomb
BLCO
$5.78B
| $210K | ﹤0.01% |
16,200
-11,500
| -42% | -$138K |
|
4441
CALL
Caleres
CAL
$432M
| $210K | ﹤0.01% |
17,200
-11,800
| -41% | -$177K |
|
4442
Designer Brands
DBI
$315M
| $210K | ﹤0.01% |
88,521
-13,689
| -13% | -$41.3K |
|
4443
PUT
The Joint Corp
JYNT
$119M
| $210K | ﹤0.01% |
18,200
+18,100
| +18,100% | +$194K |
|
4444
Tradr 1.25X NVDA Bear Daily ETF
NVDS
$17.4M
| $210K | ﹤0.01% |
4,846
+1,822
| +60% | +$120K |
|
|
AISP
4445
PUT
Airship AI Holdings
AISP
$58.9M
| $209K | ﹤0.01% |
35,500
-38,100
| -52% | -$170K |
|
4446
PUT
HealthEquity
HQY
$8.71B
| $209K | ﹤0.01% |
2,000
-5,900
| -75% | -$559K |
|
4447
MBIA
MBI
$275M
| $209K | ﹤0.01% |
48,183
-26,348
| -35% | -$117K |
|
4448
Verra Mobility
VRRM
$775M
| $209K | ﹤0.01% |
+8,257
| New | +$192K |
|
4449
CALL
Agilon Health
AGL
$1.55B
| $208K | ﹤0.01% |
3,632
+1,604
| +79% | +$129K |
|
4450
Ecovyst
ECVT
$1.32B
| $208K | ﹤0.01% |
25,322
+6,590
| +35% | +$46.3K |
|
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.