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 | |
|---|---|---|---|---|---|---|
151
CALL
AutoZone
AZO
$48.5B
| $127M | 0.06% |
29,500
+24,000
| +436% | +$96.3M |
|
|
CRCL
152
CALL
Circle Internet Group
CRCL
$16.4B
| $124M | 0.06% |
932,300
+168,100
| +22% | +$26.6M |
|
153
CALL
Marvell Technology
MRVL
$189B
| $123M | 0.06% |
1,460,400
+203,900
| +16% | +$15M |
|
154
CALL
Newmont
NEM
$102B
| $123M | 0.06% |
1,480,800
+352,100
| +31% | +$24.6M |
|
155
CALL
GameStop
GME
$9.68B
| $121M | 0.06% |
4,448,600
+618,100
| +16% | +$14.7M |
|
156
CALL
Pfizer
PFE
$142B
| $121M | 0.06% |
4,760,600
-458,400
| -9% | -$11.3M |
|
157
PUT
Salesforce
CRM
$133B
| $121M | 0.06% |
508,600
-11,900
| -2% | -$3M |
|
158
CALL
Snowflake
SNOW
$92.8B
| $119M | 0.06% |
529,500
-102,900
| -16% | -$22.1M |
|
159
CALL
ARK Space & Defense Innovation ETF
ARKX
$817M
| $117M | 0.06% |
1,655,100
-147,600
| -8% | -$3.87M |
|
160
PUT
Qualcomm
QCOM
$185B
| $116M | 0.06% |
700,100
-46,700
| -6% | -$7.41M |
|
|
KFYP
161
PUT
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $116M | 0.06% |
2,758,300
+607,000
| +28% | +$25.5M |
|
162
PUT
Palo Alto Networks
PANW
$273B
| $115M | 0.06% |
616,600
-137,900
| -18% | -$26.4M |
|
163
CALL
Target
TGT
$62.6B
| $115M | 0.06% |
1,283,600
+552,900
| +76% | +$54.4M |
|
164
CALL
Freeport-McMoran
FCX
$93.4B
| $115M | 0.06% |
3,025,700
+1,570,900
| +108% | +$68.1M |
|
165
PUT
Spotify
SPOT
$97.5B
| $114M | 0.06% |
163,800
+24,600
| +18% | +$17.2M |
|
166
CALL
Morgan Stanley
MS
$344B
| $114M | 0.06% |
716,500
-325,800
| -31% | -$48.1M |
|
|
NBIS
167
CALL
Nebius Group N.V.
NBIS
$55.4B
| $111M | 0.06% |
989,400
+49,200
| +5% | +$3.42M |
|
168
PUT
Shopify
SHOP
$154B
| $111M | 0.06% |
744,400
-14,900
| -2% | -$2.02M |
|
169
UnitedHealth
UNH
$392B
| $111M | 0.06% |
320,056
+139,889
| +78% | +$42.3M |
|
170
CALL
Vanguard S&P 500 ETF
VOO
$980B
| $110M | 0.06% |
238,100
-9,200
| -4% | -$5.42M |
|
|
OKLO
171
PUT
Oklo
OKLO
$7.74B
| $109M | 0.06% |
976,600
+60,500
| +7% | +$4.74M |
|
|
172
CALL
Shopify
SHOP
$154B
| $109M | 0.06% |
733,500
+166,700
| +29% | +$22.6M |
|
|
ETHA
173
PUT
iShares Ethereum Trust ETF
ETHA
$5.43B
| $108M | 0.06% |
3,427,700
+3,123,400
| +1,026% | +$92.7M |
|
|
174
CALL
Qualcomm
QCOM
$185B
| $108M | 0.06% |
648,400
+61,000
| +10% | +$9.68M |
|
175
CALL
Wells Fargo
WFC
$262B
| $106M | 0.05% |
1,262,200
-1,242,800
| -50% | -$101M |
|
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.