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 | |
|---|---|---|---|---|---|---|
1051
Kenvue
KVUE
$36.3B
| $7.66M | ﹤0.01% |
366,113
+189,525
| +107% | +$4.31M |
|
1052
CALL
argenx
ARGX
$57.8B
| $7.66M | ﹤0.01% |
13,900
-3,000
| -18% | -$1.74M |
|
1053
CALL
Shift4
FOUR
$3.68B
| $7.66M | ﹤0.01% |
77,300
-63,200
| -45% | -$5.51M |
|
1054
PUT
The GEO Group
GEO
$4.15B
| $7.66M | ﹤0.01% |
319,900
-106,600
| -25% | -$2.91M |
|
1055
CALL
TG Therapeutics
TGTX
$8.5B
| $7.64M | ﹤0.01% |
212,300
+50,400
| +31% | +$1.88M |
|
1056
CALL
ArcelorMittal
MT
$49.9B
| $7.64M | ﹤0.01% |
241,900
-168,900
| -41% | -$4.99M |
|
1057
State Street Materials Select Sector SPDR ETF
XLB
$8.35B
| $7.63M | ﹤0.01% |
173,812
+29,922
| +21% | +$1.27M |
|
1058
CALL
Stellantis
STLA
$16.7B
| $7.63M | ﹤0.01% |
760,800
-78,200
| -9% | -$771K |
|
1059
CALL
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$97.3M
| $7.63M | ﹤0.01% |
246,500
+198,700
| +416% | +$18.7M |
|
1060
CALL
L3Harris
LHX
$55.8B
| $7.58M | ﹤0.01% |
30,200
-23,800
| -44% | -$5.47M |
|
|
GENVR
1061
PUT
Gen Digital Inc Contingent Value Rights
GENVR
| $7.57M | ﹤0.01% |
+257,500
| New | +$1.81M |
|
1062
CALL
Nutrien
NTR
$32.9B
| $7.55M | ﹤0.01% |
129,700
+14,700
| +13% | +$831K |
|
1063
TransDigm Group
TDG
$67.9B
| $7.55M | ﹤0.01% |
4,966
+4,718
| +1,902% | +$6.63M |
|
1064
PUT
Groupon
GRPN
$966M
| $7.55M | ﹤0.01% |
225,700
| – | – |
|
|
QXO
1065
PUT
QXO Inc
QXO
$14.4B
| $7.53M | ﹤0.01% |
349,600
+264,500
| +311% | +$4.34M |
|
|
SEZL
1066
PUT
Sezzle
SEZL
$5.35B
| $7.53M | ﹤0.01% |
+42,000
| New | +$3.72M |
|
1067
Workday
WDAY
$31.6B
| $7.53M | ﹤0.01% |
+31,359
| New | +$7.64M |
|
1068
PUT
Automatic Data Processing
ADP
$97.1B
| $7.52M | ﹤0.01% |
24,400
-13,000
| -35% | -$3.99M |
|
1069
CALL
ATI
ATI
$27.3B
| $7.51M | ﹤0.01% |
87,000
+60,300
| +226% | +$4.13M |
|
1070
CALL
Summit Therapeutics
SMMT
$11.6B
| $7.49M | ﹤0.01% |
352,100
+96,600
| +38% | +$2.2M |
|
1071
Cloudflare
NET
$93.1B
| $7.49M | ﹤0.01% |
+38,235
| New | +$5.55M |
|
1072
PUT
BHP
BHP
$212B
| $7.48M | ﹤0.01% |
155,600
-200
| -0.1% | -$9.61K |
|
1073
CALL
McKesson
MCK
$96.5B
| $7.47M | ﹤0.01% |
10,200
-28,400
| -74% | -$20M |
|
|
1074
PUT
ATI
ATI
$27.3B
| $7.43M | ﹤0.01% |
86,100
+47,600
| +124% | +$3.26M |
|
1075
PUT
FTAI Aviation
FTAI
$22.2B
| $7.43M | ﹤0.01% |
64,600
-73,800
| -53% | -$8.25M |
|
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.