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 | Miscellaneous | 98.09% |
| 2 | Technology | 0.79% |
| 3 | Consumer Discretionary | 0.3% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.17% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
FITB
1601
CALL
Fifth Third Bancorp
FITB
$49.4B
| $4.35M | ﹤0.01% |
97,700
-27,700
| -22% | -$1.21M |
|
1602
Spotify
SPOT
$109B
| $4.35M | ﹤0.01% |
6,236
+3,569
| +134% | +$2.5M |
|
1603
Nektar Therapeutics
NKTR
$2.58B
| $4.35M | ﹤0.01% |
76,450
+29,497
| +63% | +$976K |
|
1604
lululemon athletica
LULU
$11.4B
| $4.35M | ﹤0.01% |
24,432
-5,356
| -18% | -$1.07M |
|
1605
CALL
Bank OZK
OZK
$5.37B
| $4.34M | ﹤0.01% |
85,200
+11,200
| +15% | +$572K |
|
1606
CALL
Valaris
VAL
$5.94B
| $4.34M | ﹤0.01% |
89,000
-60,600
| -41% | -$2.96M |
|
1607
PUT
Plug Power
PLUG
$3.14B
| $4.34M | ﹤0.01% |
1,862,300
+711,400
| +62% | +$1.21M |
|
1608
Okta
OKTA
$29.3B
| $4.32M | ﹤0.01% |
+47,070
| New | +$4.39M |
|
1609
CALL
BJs Wholesale Club
BJ
$11.3B
| $4.31M | ﹤0.01% |
46,200
+17,500
| +61% | +$1.79M |
|
1610
Comcast
CMCSA
$93.5B
| $4.31M | ﹤0.01% |
+137,122
| New | +$4.6M |
|
1611
TE Connectivity
TEL
$59.4B
| $4.3M | ﹤0.01% |
19,606
+16,106
| +460% | +$3.23M |
|
1612
CALL
Ovintiv
OVV
$17.7B
| $4.29M | ﹤0.01% |
106,300
-21,400
| -17% | -$873K |
|
1613
American Airlines Group
AAL
$8.56B
| $4.29M | ﹤0.01% |
381,568
-469,752
| -55% | -$5.79M |
|
1614
CALL
Chemours
CC
$2.33B
| $4.29M | ﹤0.01% |
270,700
+222,600
| +463% | +$3.23M |
|
1615
Merck
MRK
$366B
| $4.27M | ﹤0.01% |
50,909
+28,917
| +131% | +$2.38M |
|
1616
PUT
Illumina
ILMN
$31.9B
| $4.27M | ﹤0.01% |
46,400
+6,900
| +17% | +$684K |
|
1617
General Mills
GIS
$20.2B
| $4.27M | ﹤0.01% |
+84,657
| New | +$4.24M |
|
1618
CALL
Keysight
KEYS
$56.8B
| $4.27M | ﹤0.01% |
24,400
+14,200
| +139% | +$2.37M |
|
1619
Transocean
RIG
$6.43B
| $4.26M | ﹤0.01% |
1,364,326
+1,201,896
| +740% | +$3.63M |
|
1620
Aon
AON
$67B
| $4.24M | ﹤0.01% |
+11,892
| New | +$4.3M |
|
|
DENT
1621
PUT
DELISTED
AdvisorShares Dent Tactical ETF
DENT
| $4.24M | ﹤0.01% |
877,100
+536,600
| +158% | +$2.59M |
|
1622
PUT
Crown Castle
CCI
$32.3B
| $4.24M | ﹤0.01% |
43,900
-4,300
| -9% | -$435K |
|
1623
CALL
Elastic
ESTC
$9.29B
| $4.23M | ﹤0.01% |
50,100
+17,100
| +52% | +$1.44M |
|
1624
PUT
Cedar Fair
FUN
$1.61B
| $4.23M | ﹤0.01% |
186,200
+177,200
| +1,969% | +$4.71M |
|
1625
CALL
SEALSQ Corp
LAES
$546M
| $4.23M | ﹤0.01% |
1,131,000
+674,500
| +148% | +$2.18M |
|
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, 3,249 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 Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- 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.