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 | |
|---|---|---|---|---|---|---|
1376
CALL
Scorpio Tankers
STNG
$3.96B
| $4.8M | ﹤0.01% |
122,800
+66,100
| +117% | +$2.58M |
|
1377
PUT
CoreCivic
CXW
$3.1B
| $4.8M | ﹤0.01% |
228,000
+94,500
| +71% | +$2.04M |
|
1378
CALL
F5
FFIV
$22B
| $4.8M | ﹤0.01% |
16,300
-5,100
| -24% | -$1.41M |
|
|
METD
1379
PUT
Direxion Daily META Bear 1X ETF
METD
$8.48M
| $4.79M | ﹤0.01% |
118,800
-70,400
| -37% | -$1.27M |
|
1380
BigBear.ai
BBAI
$1.35B
| $4.79M | ﹤0.01% |
705,719
+533,466
| +310% | +$1.93M |
|
1381
PUT
CRISPR Therapeutics
CRSP
$4.56B
| $4.78M | ﹤0.01% |
98,300
+27,000
| +38% | +$1.04M |
|
1382
PUT
ProShares UltraShort Health Care
RXD
$3.3M
| $4.78M | ﹤0.01% |
68,200
+23,650
| +53% | +$578K |
|
1383
CALL
uniQure
QURE
$2.64B
| $4.78M | ﹤0.01% |
342,700
+282,000
| +465% | +$3.79M |
|
1384
CALL
Cipher Digital
CIFR
$9.73B
| $4.76M | ﹤0.01% |
996,400
+326,000
| +49% | +$1.05M |
|
1385
PUT
EPAM Systems
EPAM
$4.75B
| $4.76M | ﹤0.01% |
26,900
-11,900
| -31% | -$1.99M |
|
|
CIVI
1386
PUT
DELISTED
Civitas Resources
CIVI
| $4.75M | ﹤0.01% |
172,700
+108,500
| +169% | +$3.14M |
|
1387
Woodward
WWD
$24.9B
| $4.75M | ﹤0.01% |
19,377
+18,266
| +1,644% | +$3.74M |
|
1388
PUT
Insulet
PODD
$11.4B
| $4.74M | ﹤0.01% |
15,100
+4,500
| +42% | +$1.3M |
|
1389
Lyft
LYFT
$5.52B
| $4.74M | ﹤0.01% |
300,888
+294,699
| +4,762% | +$4.13M |
|
1390
PUT
Vornado Realty Trust
VNO
$7.52B
| $4.74M | ﹤0.01% |
123,900
+104,200
| +529% | +$3.9M |
|
1391
CALL
Capricor Therapeutics
CAPR
$1.14B
| $4.74M | ﹤0.01% |
476,900
+424,600
| +812% | +$4.49M |
|
1392
Direxion Daily Small Cap Bull 3x ETF
TNA
$1.35B
| $4.72M | ﹤0.01% |
140,768
+96,716
| +220% | +$2.72M |
|
1393
State Street SPDR S&P Bank ETF
KBE
$1.64B
| $4.72M | ﹤0.01% |
84,604
-20,864
| -20% | -$1.09M |
|
1394
CALL
Exelon
EXC
$48.5B
| $4.71M | ﹤0.01% |
108,600
+6,200
| +6% | +$276K |
|
1395
CALL
Crocs
CROX
$6.73B
| $4.71M | ﹤0.01% |
46,500
-8,400
| -15% | -$856K |
|
1396
PUT
Logitech
LOGI
$15.3B
| $4.7M | ﹤0.01% |
52,200
+7,800
| +18% | +$633K |
|
1397
PUT
Celanese
CE
$5.12B
| $4.7M | ﹤0.01% |
85,000
+27,400
| +48% | +$1.37M |
|
1398
CALL
Annaly Capital Management
NLY
$16.8B
| $4.7M | ﹤0.01% |
249,500
+92,900
| +59% | +$1.77M |
|
1399
PUT
Teladoc Health
TDOC
$1.6B
| $4.68M | ﹤0.01% |
537,700
+173,500
| +48% | +$1.26M |
|
1400
CALL
HF Sinclair
DINO
$16.1B
| $4.68M | ﹤0.01% |
113,900
+56,400
| +98% | +$1.94M |
|
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.