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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1851
PUT
McEwen Inc
MUX
$1.03B
| $3.26M | ﹤0.01% |
190,500
+118,600
| +165% | +$1.42M |
|
1852
Steven Madden
SHOO
$3.12B
| $3.26M | ﹤0.01% |
97,276
+84,313
| +650% | +$2.36M |
|
1853
PUT
Invesco
IVZ
$13.3B
| $3.25M | ﹤0.01% |
141,900
+82,100
| +137% | +$1.7M |
|
1854
PUT
Wendy's
WEN
$1.33B
| $3.25M | ﹤0.01% |
355,100
+272,400
| +329% | +$2.8M |
|
1855
Qualcomm
QCOM
$176B
| $3.25M | ﹤0.01% |
19,534
-30,864
| -61% | -$4.9M |
|
1856
CALL
Toyota
TM
$210B
| $3.25M | ﹤0.01% |
17,000
-12,200
| -42% | -$2.3M |
|
1857
PUT
Trevi Therapeutics
TRVI
$2.49B
| $3.25M | ﹤0.01% |
354,800
+240,200
| +210% | +$1.8M |
|
1858
CALL
Onto Innovation
ONTO
$13.6B
| $3.24M | ﹤0.01% |
25,100
-17,500
| -41% | -$1.87M |
|
1859
PUT
Schwab US Broad Market ETF
SCHB
$42.8B
| $3.24M | ﹤0.01% |
118,400
+36,500
| +45% | +$903K |
|
1860
PUT
Hasbro
HAS
$12.6B
| $3.24M | ﹤0.01% |
42,700
-14,000
| -25% | -$1.09M |
|
1861
PUT
Keysight
KEYS
$54.5B
| $3.24M | ﹤0.01% |
18,500
+15,600
| +538% | +$2.6M |
|
1862
CALL
Celanese
CE
$5.09B
| $3.23M | ﹤0.01% |
76,900
+33,300
| +76% | +$1.66M |
|
1863
CALL
Ouster
OUST
$2.29B
| $3.23M | ﹤0.01% |
119,600
-81,200
| -40% | -$2.26M |
|
1864
PUT
RUM Group Inc
RUM
$1.57B
| $3.22M | ﹤0.01% |
444,900
+21,300
| +5% | +$174K |
|
1865
PUT
Meritage Homes
MTH
$4.87B
| $3.21M | ﹤0.01% |
44,400
+36,800
| +484% | +$2.73M |
|
1866
CALL
BioMarin Pharmaceuticals
BMRN
$11.5B
| $3.21M | ﹤0.01% |
59,300
+1,000
| +2% | +$57.2K |
|
1867
Applied Optoelectronics
AAOI
$8.04B
| $3.21M | ﹤0.01% |
+123,745
| New | +$3.16M |
|
1868
Direxion Daily Small Cap Bull 3x ETF
TNA
$1.34B
| $3.21M | ﹤0.01% |
70,877
-69,891
| -50% | -$2.75M |
|
1869
CALL
Dynatrace
DT
$12.1B
| $3.2M | ﹤0.01% |
66,100
-10,800
| -14% | -$547K |
|
1870
PUT
Xcel Energy
XEL
$51B
| $3.2M | ﹤0.01% |
39,700
+8,000
| +25% | +$579K |
|
1871
PUT
Northern Trust
NTRS
$22.2B
| $3.19M | ﹤0.01% |
23,700
+14,100
| +147% | +$1.81M |
|
1872
CALL
Universal Display
OLED
$3.71B
| $3.19M | ﹤0.01% |
22,200
+20,700
| +1,380% | +$3.01M |
|
1873
PUT
Guardant Health
GH
$19.5B
| $3.19M | ﹤0.01% |
51,000
-11,200
| -18% | -$609K |
|
1874
Eldorado Gold
EGO
$8.31B
| $3.18M | ﹤0.01% |
110,123
+4,748
| +5% | +$112K |
|
1875
Ross Stores
ROST
$76.6B
| $3.18M | ﹤0.01% |
+20,857
| New | +$2.98M |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.