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 | |
|---|---|---|---|---|---|---|
|
GOGL
4876
PUT
DELISTED
Golden Ocean Group
GOGL
| $142K | ﹤0.01% |
19,500
-3,700
| -16% | -$28.1K |
|
4877
PUT
James Hardie Industries
JHX
$15.2B
| $142K | ﹤0.01% |
5,300
+4,300
| +430% | +$104K |
|
4878
PUT
Unisys
UIS
$252M
| $142K | ﹤0.01% |
31,500
-1,800
| -5% | -$8.09K |
|
4879
Willis Towers Watson
WTW
$29.8B
| $142K | ﹤0.01% |
+464
| New | +$144K |
|
4880
Cognyte Software
CGNT
$655M
| $141K | ﹤0.01% |
15,335
+8,441
| +122% | +$83K |
|
4881
State Street SPDR Bloomberg High Yield Bond ETF
JNK
$7.05B
| $141K | ﹤0.01% |
1,450
+1,262
| +671% | +$120K |
|
4882
CALL
Lightspeed Commerce
LSPD
$1.44B
| $141K | ﹤0.01% |
12,100
-4,800
| -28% | -$49.4K |
|
|
OCFT
4883
CALL
DELISTED
OneConnect Financial Technology
OCFT
| $141K | ﹤0.01% |
19,700
+2,000
| +11% | +$13.3K |
|
4884
Repay Holdings
RPAY
$335M
| $141K | ﹤0.01% |
+29,342
| New | +$134K |
|
4885
Talkspace
TALK
$874M
| $141K | ﹤0.01% |
51,069
-76,628
| -60% | -$226K |
|
4886
PUT
Yext
YEXT
$573M
| $141K | ﹤0.01% |
16,600
-282,600
| -94% | -$1.98M |
|
|
ZH
4887
Zhihu
ZH
$287M
| $141K | ﹤0.01% |
35,582
-59,512
| -63% | -$231K |
|
4888
PUT
Manulife Financial
MFC
$73B
| $140K | ﹤0.01% |
4,400
-12,800
| -74% | -$394K |
|
|
SLI
4889
PUT
Standard Lithium
SLI
$475M
| $140K | ﹤0.01% |
71,900
+59,200
| +466% | +$93.2K |
|
|
TGB
4890
PUT
Trekor Metals
TGB
$2.45B
| $140K | ﹤0.01% |
44,600
-14,100
| -24% | -$33K |
|
4891
PUT
Trinity Capital Inc.
TRIN
$1.58B
| $140K | ﹤0.01% |
10,000
+2,600
| +35% | +$37.6K |
|
4892
Vuzix
VUZI
$178M
| $140K | ﹤0.01% |
+48,279
| New | +$114K |
|
4893
PUT
Compass
COMP
$8.67B
| $139K | ﹤0.01% |
22,200
-9,300
| -30% | -$63.7K |
|
4894
PUT
Delek US
DK
$3.98B
| $139K | ﹤0.01% |
6,600
-34,200
| -84% | -$575K |
|
4895
CALL
Graphic Packaging
GPK
$3.35B
| $139K | ﹤0.01% |
6,600
-31,800
| -83% | -$735K |
|
|
GRFS
4896
PUT
Grifois
GRFS
$5.55B
| $139K | ﹤0.01% |
15,400
-26,500
| -63% | -$207K |
|
4897
CarMax
KMX
$8.39B
| $139K | ﹤0.01% |
+2,083
| New | +$140K |
|
4898
PUT
Qiagen
QGEN
$8.62B
| $139K | ﹤0.01% |
2,900
+2,200
| +314% | +$95.7K |
|
4899
CALL
Waters Corp
WAT
$37.3B
| $139K | ﹤0.01% |
400
-5,200
| -93% | -$1.79M |
|
4900
CALL
Abeona Therapeutics
ABEO
$355M
| $138K | ﹤0.01% |
24,300
+5,400
| +29% | +$30.7K |
|
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.