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 | |
|---|---|---|---|---|---|---|
1276
PUT
Lucid Motors
LCID
$2.52B
| $5.48M | ﹤0.01% |
259,810
-88,470
| -25% | -$2.12M |
|
1277
CALL
Rockwell Automation
ROK
$51.7B
| $5.48M | ﹤0.01% |
16,500
+9,800
| +146% | +$2.79M |
|
1278
CALL
Norfolk Southern
NSC
$79.2B
| $5.48M | ﹤0.01% |
21,400
+16,600
| +346% | +$3.91M |
|
1279
CALL
Darden Restaurants
DRI
$22.5B
| $5.47M | ﹤0.01% |
25,100
-42,200
| -63% | -$8.76M |
|
1280
PUT
Birkenstock
BIRK
$7.69B
| $5.46M | ﹤0.01% |
111,100
+73,700
| +197% | +$3.79M |
|
1281
CALL
GXO Logistics
GXO
$6.16B
| $5.43M | ﹤0.01% |
111,500
+41,000
| +58% | +$1.63M |
|
1282
Seagate
STX
$199B
| $5.39M | ﹤0.01% |
+37,369
| New | +$3.87M |
|
1283
CALL
Cytokinetics
CYTK
$11B
| $5.39M | ﹤0.01% |
163,200
+25,400
| +18% | +$883K |
|
1284
Abbott
ABT
$181B
| $5.39M | ﹤0.01% |
+39,639
| New | +$5.23M |
|
1285
CALL
Toll Brothers
TOL
$14.2B
| $5.39M | ﹤0.01% |
47,200
+11,300
| +31% | +$1.17M |
|
1286
CALL
Lincoln National
LNC
$7.88B
| $5.38M | ﹤0.01% |
155,600
+74,500
| +92% | +$2.44M |
|
1287
CALL
Vanguard Dividend Appreciation ETF
VIG
$111B
| $5.38M | ﹤0.01% |
26,300
-14,700
| -36% | -$2.85M |
|
1288
PUT
Nektar Therapeutics
NKTR
$2.4B
| $5.37M | ﹤0.01% |
207,700
+202,087
| +3,600% | +$2.27M |
|
1289
CALL
Boston Properties
BXP
$11B
| $5.36M | ﹤0.01% |
79,500
+17,900
| +29% | +$1.19M |
|
1290
CALL
J.M. Smucker
SJM
$12.6B
| $5.34M | ﹤0.01% |
54,400
+26,600
| +96% | +$2.92M |
|
1291
PUT
MPLX
MPLX
$59.2B
| $5.34M | ﹤0.01% |
103,700
-48,300
| -32% | -$2.45M |
|
1292
CALL
Trip.com Group
TCOM
$27.7B
| $5.32M | ﹤0.01% |
90,800
-62,300
| -41% | -$3.74M |
|
1293
PUT
DigitalOcean
DOCN
$14.6B
| $5.32M | ﹤0.01% |
186,400
+161,400
| +646% | +$4.71M |
|
1294
CALL
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $5.32M | ﹤0.01% |
83,200
+16,200
| +24% | +$1.03M |
|
1295
PUT
PNC Financial Services
PNC
$101B
| $5.31M | ﹤0.01% |
28,500
-77,700
| -73% | -$13.1M |
|
1296
CALL
Albertsons Companies
ACI
$5.4B
| $5.31M | ﹤0.01% |
246,800
-80,200
| -25% | -$1.74M |
|
1297
CALL
Aptiv
APTV
$12.1B
| $5.31M | ﹤0.01% |
77,800
-143,100
| -65% | -$8.86M |
|
1298
PUT
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$97.5M
| $5.31M | ﹤0.01% |
215,200
-160,300
| -43% | -$15.1M |
|
1299
CALL
Range Resources
RRC
$9.23B
| $5.3M | ﹤0.01% |
130,300
+69,600
| +115% | +$2.62M |
|
|
PPTA
1300
CALL
Perpetua Resources
PPTA
$2.24B
| $5.26M | ﹤0.01% |
433,600
+405,700
| +1,454% | +$5.46M |
|
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.