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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
776
CALL
Trump Media & Technology Group
DJT
$1.45B
| $9.7M | 0.01% |
1,069,600
-123,900
| -10% | -$1.13M |
2026 Q1
2 quarters
|
|
777
CALL
Tower Semiconductor
TSEM
$18B
| $9.6M | 0.01% |
42,400
-20,900
| -33% | -$4.73M |
2015 Q1
46 quarters
|
|
778
CALL
Charter Communications
CHTR
$15.6B
| $9.6M | 0.01% |
86,900
+9,100
| +12% | +$1.27M |
2026 Q1
2 quarters
|
|
779
CALL
Lyft
LYFT
$6.53B
| $9.6M | 0.01% |
641,500
-62,600
| -9% | -$1M |
2021 Q1
22 quarters
|
|
780
PUT
Pinterest
PINS
$11B
| $9.6M | 0.01% |
509,700
-237,500
| -32% | -$5.2M |
2019 Q2
29 quarters
|
|
781
CALL
On Holding
ONON
$11.6B
| $9.6M | 0.01% |
323,800
+101,400
| +46% | +$3.31M |
2021 Q4
19 quarters
|
|
782
CALL
Kroger
KR
$41B
| $9.6M | 0.01% |
163,300
-12,800
| -7% | -$745K |
2014 Q4
47 quarters
|
|
783
CALL
Enterprise Products Partners
EPD
$80.1B
| $9.6M | 0.01% |
268,700
-320,800
| -54% | -$12.2M |
2021 Q2
21 quarters
|
|
784
CALL
Snap
SNAP
$9.22B
| $9.6M | 0.01% |
1,771,700
-650,900
| -27% | -$3.36M |
2017 Q1
38 quarters
|
|
785
CALL
United States Natural Gas Fund
UNG
$628M
| $9.6M | 0.01% |
921,200
+21,400
| +2% | +$223K |
2021 Q2
21 quarters
|
|
786
CALL
Affirm
AFRM
$23B
| $9.5M | 0.01% |
137,900
+9,500
| +7% | +$714K |
2021 Q1
22 quarters
|
|
787
CALL
Monster Beverage
MNST
$88.9B
| $9.5M | 0.01% |
228,700
+131,700
| +136% | +$6.1M |
2021 Q2
21 quarters
|
|
788
PUT
UiPath
PATH
$6.85B
| $9.48M | 0.01% |
738,200
-222,300
| -23% | -$3.09M |
2021 Q2
21 quarters
|
|
789
PUT
Twilio
TWLO
$34B
| $9.48M | 0.01% |
32,400
-3,700
| -10% | -$843K |
2016 Q3
40 quarters
|
|
790
Western Digital
WDC
$117B
| $9.47M | 0.01% |
20,836
+9,406
| +82% | +$4.57M |
2025 Q4
3 quarters
|
|
791
CALL
Automatic Data Processing
ADP
$121B
| $9.44M | 0.01% |
36,600
+18,700
| +104% | +$4.96M |
2026 Q1
2 quarters
|
|
792
CALL
NuScale Power
SMR
$2.15B
| $9.41M | 0.01% |
1,190,600
+226,700
| +24% | +$2.04M |
2022 Q2
17 quarters
|
|
793
CALL
Amkor Technology
AMKR
$9.44B
| $9.38M | 0.01% |
179,000
+59,300
| +50% | +$3.3M |
2019 Q1
30 quarters
|
|
794
CALL
eBay
EBAY
$53.9B
| $9.35M | 0.01% |
88,200
-34,900
| -28% | -$3.8M |
2021 Q1
22 quarters
|
|
|
IPFF
795
CALL
DELISTED
iShares International Preferred Stock ETF
IPFF
| $9.34M | 0.01% |
249,800
+126,000
| +102% | +$4.71M |
2016 Q1
42 quarters
|
|
796
CALL
Cenovus Energy
CVE
$51.3B
| $9.33M | 0.01% |
300,200
+2,200
| +0.7% | +$66.4K |
2021 Q2
21 quarters
|
|
797
CALL
Upstart Holdings
UPST
$2.03B
| $9.32M | 0.01% |
405,300
+80,900
| +25% | +$2.32M |
2021 Q1
22 quarters
|
|
798
PUT
Galaxy Digital Inc
GLXY
$3.06B
| $9.31M | 0.01% |
409,600
+137,000
| +50% | +$3.2M |
2025 Q3
4 quarters
|
|
799
PUT
DexCom
DXCM
$30B
| $9.3M | 0.01% |
107,800
-12,800
| -11% | -$1.07M |
2014 Q4
47 quarters
|
|
800
CALL
Teva Pharmaceutical Industries Limited
TEVA
$50.5B
| $9.28M | 0.01% |
234,400
-110,500
| -32% | -$3.95M |
2026 Q1
2 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.