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 | |
|---|---|---|---|---|---|---|
2201
TripAdvisor
TRIP
$1.59B
| $2.25M | ﹤0.01% |
138,597
+110,026
| +385% | +$1.92M |
|
2202
CALL
GigaCloud Technology
GCT
$1.35B
| $2.25M | ﹤0.01% |
79,300
+800
| +1% | +$20.9K |
|
2203
PUT
Baxter International
BAX
$11.6B
| $2.25M | ﹤0.01% |
98,900
+5,300
| +6% | +$134K |
|
2204
First Horizon
FHN
$12.1B
| $2.25M | ﹤0.01% |
99,562
+29,100
| +41% | +$647K |
|
|
TWO
2205
PUT
Two Harbors Investment
TWO
$1.27B
| $2.25M | ﹤0.01% |
227,900
+225,000
| +7,759% | +$2.27M |
|
2206
CALL
Bausch Health
BHC
$1.65B
| $2.25M | ﹤0.01% |
348,100
+46,400
| +15% | +$317K |
|
2207
PUT
Harmony Gold Mining
HMY
$9.92B
| $2.25M | ﹤0.01% |
123,700
-1,100
| -0.9% | -$16.6K |
|
2208
PUT
U-Haul Holding Co Series N
UHAL.B
$12.2B
| $2.24M | ﹤0.01% |
39,600
+38,600
| +3,860% | +$2.06M |
|
2209
CALL
Credit Acceptance
CACC
$6B
| $2.24M | ﹤0.01% |
4,800
-3,800
| -44% | -$1.9M |
|
2210
PUT
Richtech Robotics
RR
$347M
| $2.24M | ﹤0.01% |
+522,300
| New | +$1.37M |
|
|
VG
2211
PUT
Venture Global Inc
VG
$35.6B
| $2.24M | ﹤0.01% |
157,800
-87,700
| -36% | -$1.25M |
|
2212
CALL
Canadian Imperial Bank of Commerce
CM
$107B
| $2.24M | ﹤0.01% |
28,000
-125,700
| -82% | -$9.46M |
|
2213
CALL
Star Bulk Carriers
SBLK
$3.14B
| $2.24M | ﹤0.01% |
120,300
-56,600
| -32% | -$1.07M |
|
2214
CALL
Planet Fitness
PLNT
$4.23B
| $2.23M | ﹤0.01% |
21,500
-126,600
| -85% | -$13.5M |
|
2215
PUT
Booz Allen Hamilton
BAH
$8.7B
| $2.23M | ﹤0.01% |
22,300
-13,600
| -38% | -$1.45M |
|
2216
CALL
Global Net Lease
GNL
$1.87B
| $2.23M | ﹤0.01% |
274,100
-20,800
| -7% | -$159K |
|
2217
PUT
Plains All American Pipeline
PAA
$17.4B
| $2.23M | ﹤0.01% |
130,600
-83,600
| -39% | -$1.5M |
|
2218
CALL
Shake Shack
SHAK
$2.3B
| $2.23M | ﹤0.01% |
23,800
-1,200
| -5% | -$138K |
|
|
JMIA
2219
CALL
Jumia Technologies
JMIA
$726M
| $2.23M | ﹤0.01% |
191,800
-5,300
| -3% | -$38.8K |
|
2220
PUT
XPO
XPO
$25B
| $2.22M | ﹤0.01% |
17,200
+5,000
| +41% | +$649K |
|
2221
B2Gold
BTG
$5.16B
| $2.22M | ﹤0.01% |
448,944
+234,702
| +110% | +$923K |
|
2222
CALL
Eastman Chemical
EMN
$7.8B
| $2.21M | ﹤0.01% |
35,100
-200
| -0.6% | -$14K |
|
2223
CALL
ARK 21Shares Bitcoin ETF
ARKB
$2.45B
| $2.21M | ﹤0.01% |
58,200
-33,200
| -36% | -$1.26M |
|
2224
PUT
United Natural Foods
UNFI
$3.01B
| $2.21M | ﹤0.01% |
58,800
-19,900
| -25% | -$546K |
|
2225
CALL
Zions Bancorporation
ZION
$10.1B
| $2.21M | ﹤0.01% |
39,100
+1,500
| +4% | +$83.5K |
|
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.