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 | |
|---|---|---|---|---|---|---|
151
PUT
Direxion Daily Technology Bull 3x ETF
TECL
$5.62B
| $109M | 0.06% |
3,573,600
-139,200
| -4% | -$9.2M |
|
152
CALL
ARK Space & Defense Innovation ETF
ARKX
$827M
| $107M | 0.06% |
1,802,700
+219,000
| +14% | +$4.37M |
|
153
PUT
Spotify
SPOT
$98.7B
| $107M | 0.06% |
139,200
+20,100
| +17% | +$12.9M |
|
154
PUT
Adobe
ADBE
$88.1B
| $106M | 0.06% |
274,100
-93,400
| -25% | -$36M |
|
155
PUT
Hims & Hers Health
HIMS
$7.48B
| $105M | 0.06% |
2,104,300
+1,038,200
| +97% | +$46.9M |
|
156
CALL
Vanguard S&P 500 ETF
VOO
$982B
| $104M | 0.06% |
247,300
-33,600
| -12% | -$17.7M |
|
157
CALL
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$254M
| $103M | 0.06% |
4,172,300
-420,600
| -9% | -$8.85M |
|
158
PUT
Mastercard
MA
$473B
| $102M | 0.06% |
181,500
+30,200
| +20% | +$16.7M |
|
159
CALL
Roblox
RBLX
$36B
| $101M | 0.06% |
956,500
+417,300
| +77% | +$32.8M |
|
160
CALL
Occidental Petroleum
OXY
$57.2B
| $101M | 0.06% |
2,392,700
+7,800
| +0.3% | +$326K |
|
|
XYZ
161
CALL
Block Inc
XYZ
$46.3B
| $99.2M | 0.06% |
1,460,200
+258,500
| +22% | +$15M |
|
|
KFYP
162
CALL
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $98.7M | 0.06% |
3,161,800
-3,379,100
| -52% | -$105M |
|
163
PUT
Lam Research
LRCX
$401B
| $98.2M | 0.06% |
1,009,200
+240,800
| +31% | +$19.1M |
|
|
164
PUT
Pfizer
PFE
$142B
| $97.6M | 0.06% |
4,024,400
-627,400
| -13% | -$14.6M |
|
165
CALL
Marvell Technology
MRVL
$192B
| $97.3M | 0.06% |
1,256,500
+258,400
| +26% | +$16.1M |
|
|
166
CALL
Pfizer
PFE
$142B
| $95.8M | 0.05% |
5,219,000
+747,300
| +17% | +$17.4M |
|
167
PUT
Freeport-McMoran
FCX
$92.7B
| $94.3M | 0.05% |
2,175,000
+318,100
| +17% | +$12.1M |
|
168
CALL
Qualcomm
QCOM
$186B
| $93.5M | 0.05% |
587,400
+6,200
| +1% | +$913K |
|
169
CALL
GameStop
GME
$9.75B
| $93.4M | 0.05% |
3,830,500
+1,015,600
| +36% | +$27.2M |
|
170
CALL
Procter & Gamble
PG
$350B
| $92.4M | 0.05% |
580,100
+8,900
| +2% | +$1.45M |
|
171
CALL
Starbucks
SBUX
$119B
| $92.3M | 0.05% |
1,159,700
-209,500
| -15% | -$18.2M |
|
172
CALL
SoFi Technologies
SOFI
$22B
| $91.6M | 0.05% |
5,032,000
+75,600
| +2% | +$997K |
|
173
CALL
CVS Health
CVS
$139B
| $91.4M | 0.05% |
1,325,100
-1,007,700
| -43% | -$66.1M |
|
174
PUT
PayPal
PYPL
$49.1B
| $89.7M | 0.05% |
1,338,500
+79,100
| +6% | +$5.42M |
|
|
175
CALL
Direxion Daily Technology Bull 3x ETF
TECL
$5.62B
| $88.5M | 0.05% |
2,894,600
+875,500
| +43% | +$57.9M |
|
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.