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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 | |
|---|---|---|---|---|---|---|---|
1601
PUT
Ultra Clean Holdings
UCTT
$2.38B
| $3.02M | ﹤0.01% |
37,200
-11,200
| -23% | -$934K |
2021 Q2
21 quarters
|
|
1602
CALL
Unilever
UL
$142B
| $3.01M | ﹤0.01% |
62,400
-65,400
| -51% | -$4.11M |
2021 Q1
22 quarters
|
|
1603
CALL
American Conservative Values ETF
ACVF
$154M
| $3M | ﹤0.01% |
364,400
-1,125,100
| -76% | -$61.6M |
2023 Q4
11 quarters
|
|
1604
CALL
Sterling Infrastructure
STRL
$9.27B
| $3M | ﹤0.01% |
6,100
+1,800
| +42% | +$1.01M |
2022 Q4
15 quarters
|
|
1605
CALL
SiTime
SITM
$14.3B
| $3M | ﹤0.01% |
4,600
+2,500
| +119% | +$1.52M |
2021 Q4
19 quarters
|
|
1606
Synchrony
SYF
$23.4B
| $3M | ﹤0.01% |
42,250
+24,641
| +140% | +$1.87M |
2026 Q2
1 quarter
|
|
1607
CALL
National Fuel Gas
NFG
$7.2B
| $3M | ﹤0.01% |
39,500
+22,700
| +135% | +$1.84M |
2025 Q1
6 quarters
|
|
1608
TTM Technologies
TTMI
$8.29B
| $3M | ﹤0.01% |
24,388
+11,640
| +91% | +$1.49M |
2025 Q2
5 quarters
|
|
1609
CALL
StoneCo
STNE
$1.81B
| $2.99M | ﹤0.01% |
319,900
+75,800
| +31% | +$780K |
2019 Q1
30 quarters
|
|
1610
CALL
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.1B
| $2.99M | ﹤0.01% |
21,200
-12,100
| -36% | -$795K |
2021 Q1
22 quarters
|
|
1611
CALL
TE Connectivity
TEL
$62.9B
| $2.98M | ﹤0.01% |
14,100
-800
| -5% | -$165K |
2016 Q2
41 quarters
|
|
1612
CALL
YieldMax TSLA Option Income Strategy ETF
TSLY
$625M
| $2.97M | ﹤0.01% |
165,100
+74,000
| +81% | +$1.71M |
2025 Q4
3 quarters
|
|
1613
PUT
Parker-Hannifin
PH
$123B
| $2.96M | ﹤0.01% |
3,100
-2,400
| -44% | -$2.36M |
2014 Q4
47 quarters
|
|
1614
CALL
Definium Therapeutics
DFTX
$4.63B
| $2.96M | ﹤0.01% |
77,800
+38,800
| +99% | +$1.64M |
2021 Q2
21 quarters
|
|
1615
PUT
ImmunityBio
IBRX
$7.07B
| $2.96M | ﹤0.01% |
313,200
+93,600
| +43% | +$748K |
2019 Q4
27 quarters
|
|
1616
Ondas Inc
ONDS
$3.34B
| $2.95M | ﹤0.01% |
403,044
+261,152
| +184% | +$2.05M |
2022 Q4
15 quarters
|
|
1617
PUT
Truist Financial
TFC
$60.2B
| $2.95M | ﹤0.01% |
63,800
-39,800
| -38% | -$2.02M |
2015 Q1
46 quarters
|
|
1618
Frontline
FRO
$10.1B
| $2.95M | ﹤0.01% |
59,907
-4,767
| -7% | -$203K |
2026 Q1
2 quarters
|
|
1619
CALL
Simon Property Group
SPG
$75.7B
| $2.95M | ﹤0.01% |
14,700
+6,000
| +69% | +$1.31M |
2021 Q2
21 quarters
|
|
1620
PUT
Vishay Intertechnology
VSH
$4.47B
| $2.95M | ﹤0.01% |
90,600
-74,800
| -45% | -$2.62M |
2026 Q2
1 quarter
|
|
1621
PUT
Vicor
VICR
$7.76B
| $2.95M | ﹤0.01% |
10,200
+900
| +10% | +$204K |
2018 Q1
34 quarters
|
|
1622
CALL
Entegris
ENTG
$23.6B
| $2.94M | ﹤0.01% |
19,100
+10,200
| +115% | +$1.44M |
2018 Q2
33 quarters
|
|
1623
CALL
Symbotic
SYM
$4.82B
| $2.94M | ﹤0.01% |
69,900
+8,800
| +14% | +$371K |
2022 Q3
16 quarters
|
|
1624
Sibanye-Stillwater
SBSW
$6.51B
| $2.94M | ﹤0.01% |
287,983
+17,158
| +6% | +$178K |
2025 Q3
4 quarters
|
|
1625
PUT
SentinelOne
S
$8.28B
| $2.94M | ﹤0.01% |
123,700
-87,800
| -42% | -$1.81M |
2021 Q4
19 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.