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 | |
|---|---|---|---|---|---|---|
1301
PUT
Tenet Healthcare
THC
$20.3B
| $5.26M | ﹤0.01% |
29,900
-48,500
| -62% | -$7.3M |
|
1302
PUT
PennyMac Financial
PFSI
$4.4B
| $5.25M | ﹤0.01% |
52,700
-20,200
| -28% | -$1.96M |
|
1303
CALL
Cognizant
CTSH
$21.2B
| $5.24M | ﹤0.01% |
67,100
-153,800
| -70% | -$11.8M |
|
|
CDTX
1304
PUT
DELISTED
Cidara Therapeutics
CDTX
| $5.23M | ﹤0.01% |
+107,400
| New | +$2.58M |
|
1305
CALL
AerCap
AER
$24B
| $5.23M | ﹤0.01% |
44,700
-55,800
| -56% | -$6.03M |
|
1306
PUT
Stryker
SYK
$126B
| $5.22M | ﹤0.01% |
13,200
+4,100
| +45% | +$1.53M |
|
1307
PUT
Sprouts Farmers Market
SFM
$6.89B
| $5.22M | ﹤0.01% |
31,700
+2,800
| +10% | +$457K |
|
1308
CALL
Kyndryl
KD
$2.67B
| $5.21M | ﹤0.01% |
124,300
+26,600
| +27% | +$962K |
|
1309
PUT
Goodyear
GT
$2.07B
| $5.21M | ﹤0.01% |
502,800
+225,300
| +81% | +$2.39M |
|
1310
GSK
GSK
$103B
| $5.21M | ﹤0.01% |
+135,595
| New | +$5.18M |
|
1311
CALL
Starwood Property Trust
STWD
$6.11B
| $5.21M | ﹤0.01% |
259,400
+1,200
| +0.5% | +$23.3K |
|
1312
PUT
Exelixis
EXEL
$14B
| $5.2M | ﹤0.01% |
118,000
+17,800
| +18% | +$711K |
|
1313
CALL
Rubrik
RBRK
$15.1B
| $5.2M | ﹤0.01% |
58,000
-2,900
| -5% | -$229K |
|
1314
PUT
Arthur J. Gallagher & Co
AJG
$63.3B
| $5.18M | ﹤0.01% |
16,200
+13,400
| +479% | +$4.42M |
|
1315
CALL
DigitalOcean
DOCN
$14.9B
| $5.18M | ﹤0.01% |
181,300
+50,200
| +38% | +$1.47M |
|
1316
CALL
Kimberly-Clark
KMB
$36.2B
| $5.17M | ﹤0.01% |
40,100
-11,500
| -22% | -$1.56M |
|
1317
PUT
S&P Global
SPGI
$126B
| $5.17M | ﹤0.01% |
9,800
-4,700
| -32% | -$2.35M |
|
1318
PUT
Cheniere Energy
LNG
$56.6B
| $5.16M | ﹤0.01% |
21,200
-51,700
| -71% | -$12M |
|
|
MRSH
1319
PUT
Marsh
MRSH
$85.4B
| $5.16M | ﹤0.01% |
23,600
+7,100
| +43% | +$1.6M |
|
|
FITB
1320
CALL
Fifth Third Bancorp
FITB
$52.2B
| $5.16M | ﹤0.01% |
125,400
-173,400
| -58% | -$6.51M |
|
1321
PUT
UBS Group
UBS
$170B
| $5.15M | ﹤0.01% |
152,400
-6,500
| -4% | -$201K |
|
1322
CALL
Axsome Therapeutics
AXSM
$12.4B
| $5.15M | ﹤0.01% |
49,300
-11,900
| -19% | -$1.26M |
|
1323
CALL
Unilever
UL
$131B
| $5.14M | ﹤0.01% |
74,667
-6,489
| -8% | -$455K |
|
1324
CALL
Arbor Realty Trust
ABR
$975M
| $5.13M | ﹤0.01% |
479,800
-190,500
| -28% | -$2.01M |
|
1325
CALL
Rexford Industrial Realty
REXR
$8.78B
| $5.13M | ﹤0.01% |
144,100
-2,100
| -1% | -$73.3K |
|
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.