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 | |
|---|---|---|---|---|---|---|
1751
CALL
Nice
NICE
$5.29B
| $3.65M | ﹤0.01% |
25,200
-21,000
| -45% | -$3.15M |
|
1752
Under Armour
UAA
$3B
| $3.65M | ﹤0.01% |
730,487
+283,413
| +63% | +$1.65M |
|
|
NVMI
1753
CALL
Nova
NVMI
$13.9B
| $3.64M | ﹤0.01% |
11,400
+9,800
| +613% | +$2.71M |
|
1754
CleanSpark
CLSK
$3.73B
| $3.64M | ﹤0.01% |
251,232
-160,724
| -39% | -$1.81M |
|
1755
PUT
Murphy Oil
MUR
$5.58B
| $3.61M | ﹤0.01% |
127,200
+104,600
| +463% | +$2.64M |
|
|
BLSH
1756
Bullish
BLSH
$3.63B
| $3.61M | ﹤0.01% |
+56,759
| New | +$3.48M |
|
1757
PUT
Keurig Dr Pepper
KDP
$40.4B
| $3.61M | ﹤0.01% |
141,500
+86,900
| +159% | +$2.72M |
|
1758
CALL
Scholar Rock
SRRK
$5.71B
| $3.61M | ﹤0.01% |
96,900
+72,100
| +291% | +$2.52M |
|
1759
CALL
Ball Corp
BALL
$17B
| $3.6M | ﹤0.01% |
71,500
-67,200
| -48% | -$3.63M |
|
1760
CALL
Vornado Realty Trust
VNO
$7.47B
| $3.6M | ﹤0.01% |
88,900
-21,700
| -20% | -$846K |
|
1761
PUT
Brookfield
BN
$102B
| $3.6M | ﹤0.01% |
78,750
-15,450
| -16% | -$685K |
|
1762
CALL
Synchrony
SYF
$23.7B
| $3.6M | ﹤0.01% |
50,600
-12,600
| -20% | -$913K |
|
1763
iShares MSCI South Korea ETF
EWY
$21.7B
| $3.59M | ﹤0.01% |
+44,867
| New | +$3.34M |
|
1764
PayPal
PYPL
$49.5B
| $3.59M | ﹤0.01% |
+53,593
| New | +$3.78M |
|
1765
CALL
Scotiabank
BNS
$106B
| $3.59M | ﹤0.01% |
55,500
-60,400
| -52% | -$3.56M |
|
1766
PUT
Tencent Music
TME
$14.5B
| $3.58M | ﹤0.01% |
153,400
+17,400
| +13% | +$403K |
|
1767
PUT
Zimmer Biomet
ZBH
$17.7B
| $3.58M | ﹤0.01% |
36,300
+31,800
| +707% | +$3.15M |
|
1768
PUT
Unusual Machines
UMAC
$925M
| $3.58M | ﹤0.01% |
236,800
+200,900
| +560% | +$2.12M |
|
1769
PUT
EPAM Systems
EPAM
$4.69B
| $3.57M | ﹤0.01% |
23,700
-3,200
| -12% | -$525K |
|
1770
CALL
Hasbro
HAS
$12.6B
| $3.57M | ﹤0.01% |
47,100
-3,000
| -6% | -$233K |
|
1771
Teladoc Health
TDOC
$1.58B
| $3.57M | ﹤0.01% |
461,407
-45,783
| -9% | -$357K |
|
1772
PUT
Argan
AGX
$7.98B
| $3.56M | ﹤0.01% |
13,200
+6,800
| +106% | +$1.56M |
|
1773
Waste Management
WM
$95.9B
| $3.56M | ﹤0.01% |
16,142
+11,483
| +246% | +$2.59M |
|
1774
PUT
Southern Copper
SCCO
$141B
| $3.56M | ﹤0.01% |
30,098
+5,714
| +23% | +$561K |
|
1775
PUT
Range Resources
RRC
$9.11B
| $3.55M | ﹤0.01% |
94,400
-63,100
| -40% | -$2.25M |
|
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.